A Method for the Preparation of a Stable, Fire-Retardant Composition of Boron-Containing Compounds, the Composition so Obtained and a Method and a Use of Said Composition

Abstract

A fire-retardant composition having stable physical and chemical properties, comprising a salt of a first boron-containing compound in an amount A, a second boron-containing compound in an amount B, a first solvent comprising at least one organic solvent in an amount C, and a second solvent comprising water in an amount D. With respect to the total weight of the fire-retardant composition, A represents 15 to 45 wt.-%, B represents 15 to 46 wt.-%, C represents 0.2622×the amount B to 0.3944×the amount B wt.-%, and D represents 0.3549×the amount B to 0.4860×the amount B wt.-%. D=(the amount A+the amount B+the amount C); and 100−(the amount A+the amount B+the amount C) is greater that D. A method of preparation, a use and a method for imparting fire-retardant properties to a substrate.

Claims

1-58. (canceled)

59. A method for preparing a fire-retardant composition useful for protecting a substrate, said fire-retardant composition having stable physical and chemical properties and comprising a salt of a first boron-containing compound in an amount A, said salt of a first boron-containing compound being a borate salt or a mixture of borate salts; a second boron-containing compound in an amount B, said second boron-containing compound being selected from the group consisting of boric acids; a first solvent comprising at least one organic solvent, in an amount C, and a second solvent comprising water, in an amount D; said method comprising the steps of (i) mixing the amount C of the first solvent in the amount D of the second solvent to obtain a homogenous mixture of the first solvent and the second solvent; (ii) mixing and dissolving the amount A of the salt of the first boron-containing compound in the homogeneous mixture obtained from step (i), to obtain a homogenous mixture of the first solvent, the second solvent and the salt of the first boron-containing compound; (iii) mixing and dissolving the amount B of the second boron-containing compound in the homogeneous mixture obtained from step (iii), to obtain a homogeneous mixture of the first solvent, the second solvent, the salt of the first boron-containing compound and the second boron-containing compound; to provide the fire-retardant composition wherein the amount A of the salt of the first boron-containing compound represents from 15 to 45 wt.-% of the total weight of the fire-retardant composition, the amount B of the second boron-containing compound represents from 15 to 46 wt.-% of the total weight of the fire-retardant composition, the amount C of the first solvent represents from 0.2622×the amount B to 0.3944×the amount B wt.-% of the total weight of the fire-retardant composition; and the amount D of the second solvent represents from 0.3549×the amount B to 0.4860×the amount B wt.-% of the total weight of the fire-retardant composition; and wherein 100×(the amount A+the amount B+the amount C) is greater that D; and optionally said method further comprising a step of adding a diluent to the fire-retardant composition to adjust the viscosity at a low level, said diluent being the first solvent, the second solvent or the mixture thereof.

60. The method according to claim 59, wherein the fire-retardant composition is a concentrate configured for dilution at a low viscosity before use.

61. The method according to claim 59, wherein the fire-retardant composition has a viscosity that ranges from 20 cps to 200 cps at 23° C.

62. The method according to claim 61, wherein the amount A varies from 35 to 45 wt.-% of the total weight of the fire-retardant composition, and wherein the amount B varies from 35 to 45 wt.-% of the total weight of the fire-retardant composition.

63. The method according to claim 61, wherein steps (i) to (iii) are carried out at a temperature varying from 20 to 80° C.

64. The method according to claim 61, wherein the stability of the fire-retardant composition has at least one of the following properties: a viscosity varying at 23° C. from 20 to 200 cps in order to flow within piping; and a stability against precipitation or phase separation for at least one year within temperature ranges that that include temperatures lower that −10° C. and higher than 80° C., said composition recovering its original properties and viscosity when returning to a surrounding working environment of about 23° C.

65. The method according to claim 62, wherein the amount C in weight percent of the fire-retardant composition is of 0.2622×the amount B, or the amount C in weight percent of the fire-retardant composition is of 0.3060×the amount B, or the amount C in weight percent of the fire-retardant composition is of 0.3934×the amount B, or the amount C in weight percent of the fire-retardant composition is of 0.3465×the amount B; and wherein the amount D in weight percent of the fire-retardant composition is of 0.3549×the amount B, or the amount D in weight percent of the fire-retardant composition is of 0.4860×the amount B, or the amount D in weight percent of the fire-retardant composition is of 0.4424×the amount B, or the amount D in weight percent of the fire-retardant composition is of 0.3860×the amount B.

66. The method according to claim 62, wherein the first solvent is at least one organic solvent that includes at least a nitrogen atom or at least one hydroxyl group or at least a nitrogen atom and at least one hydroxyl group.

67. The method according to claim 62, wherein the salt of the first boron-containing compound is selected from the group consisting of potassium borates, sodium borates, disodium octaborate tetrahydrate, dipotassium octaborate tetrahydrate, borax decahydrate, borax pentahydrate, salts of metaboric acid, salts of orthoboric acid, and mixtures thereof.

68. The method according to claim 62, wherein the substrate is a cellulosic substrate.

69. A concentrate fire-retardant composition useful for preparing a fire-retardant composition which is useful for protecting a substrate, said fire retardant composition having stable physical and chemical properties and a low viscosity, and comprising a salt of a first boron-containing compound, a second boron-containing compound, at least one first solvent and at least one second solvent, obtained by a method as defined in claim 60.

70. A fire-retardant composition useful for protecting a substrate, said fire retardant composition having stable physical and chemical properties and a low viscosity, and comprising a salt of a first boron-containing compound, a second boron-containing compound, at least one first solvent and at least one second solvent, obtained by a method as defined in claim 61.

71. A fire-retardant composition useful for protecting a substrate, said fire-retardant composition having stable physical and chemical properties and comprising a salt of a first boron-containing compound in an amount A, said salt of a first boron-containing compound being a borate salt or a mixture of borate salts; a second boron-containing compound in an amount B, said second boron-containing compound being selected from the group consisting of boric acids; a first solvent comprising at least one organic solvent, in an amount C, and a second solvent comprising water, in an amount D; wherein the amount A of the salt of the first boron-containing compound represents from 15 to 45 wt.-% of the total weight of the fire-retardant composition, the amount B of the second boron-containing compound represents from 15 to 46 wt.-% of the total weight of the fire-retardant composition, the amount C of the first solvent represents from 0.2622×the amount B to 0.3944×the amount B wt.-% of the total weight of the fire-retardant composition; and the amount D of the second solvent represents from 0.3549×the amount B to 0.4860×the amount B wt.-% of the total weight of the fire-retardant composition; and wherein 100−(the amount A+the amount B+the amount C) is greater that D.

72. The fire-retardant composition according to claim 71, wherein the fire-retardant composition is a concentrate.

73. The fire-retardant composition according to claim 72, wherein the fire-retardant composition has a viscosity that ranges between 20 cps to 200 cps at 23° C.

74. The fire-retardant composition according to claim 73, wherein the amount A varies from 35 to 45 wt.-% of the total weight of the fire-retardant composition, and wherein the amount B varies from 35 to 45 wt.-% of the total weight of the fire-retardant composition.

75. The fire-retardant composition according to claim 74, wherein the stability of the fire-retardant composition has at least one of the following preferred properties: a viscosity varying at 23° C. from 20 to 200 cps in order to flow within piping; and a stability against precipitation or phase separation for at least one year within temperature ranges that may be comprised between temperatures lower that −10° C. and higher than 80° C., said composition recovering its original properties and viscosity when returning to a surrounding working environment of about 23° C.

76. The fire-retardant composition according to claim 74, wherein the amount C in weight percent of the fire-retardant composition is of 0.2622×the amount B, or the amount C in weight percent of the fire-retardant composition is of 0.3060× the amount B, or the amount C in weight percent of the fire-retardant composition is of 0.3934× the amount B, or wherein the amount C in weight percent of the fire-retardant composition is of 0.3465× the amount B; and wherein the amount D in weight percent of the fire-retardant composition is of 0.3549× the amount B, or the amount D in weight percent of the fire-retardant composition is of 0.4860×the amount B, or the amount D in weight percent of the fire-retardant composition is of 0.4424×the amount B, or the amount D in weight percent of the fire-retardant composition is of 0.3860×the amount B.

77. The fire-retardant composition according to claim 73, wherein the first solvent is at least one organic solvent having at least one nitrogen atom or at least one hydroxyl group or at least one nitrogen atom and at least one hydroxyl group.

78. The fire-retardant composition according claim 74, wherein the salt of the first boron-containing compound is selected from the group consisting of potassium borates, sodium borates, disodium octaborate tetrahydrate, dipotassium octaborate tetrahydrate, borax decahydrate, borax pentahydrate, salts of metaboric acid, salts of orthoboric acid, and mixtures thereof.

79. The fire-retardant composition according to claim 74, wherein the substrate is a cellulosic substrate.

80. A method for imparting fire-retardant properties to a substrate, wherein a fire-retardant composition as defined in claim 70 is contacted with the substrate.

Description

DESCRIPTION OF PREFERRED EMBODIMENTS OF THE INVENTION

[0043] Before variants, examples or preferred embodiments of the invention be explained in detail, it is to be understood that the invention is not limited in its application to the details set forth in the following description. The invention is capable of other embodiments and of being practiced or of being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting.

[0044] An embodiment of the invention relates to a method for preparing a fire-retardant composition useful for protecting a substrate, said fire-retardant composition having stable physical and chemical properties and comprising [0045] a salt of a first boron-containing compound in an amount A, said salt of a first boron-containing compound being a borate salt or a mixture of borate salts; [0046] a second boron-containing compound in an amount B, said second boron-containing compound being selected from the group consisting of boric acids; [0047] a first solvent comprising at least one organic solvent, in an amount C, and [0048] a second solvent comprising water, in an amount D;
said method comprising the steps of [0049] (i) mixing the amount C of the first solvent in the amount D of the second solvent to obtain a homogenous mixture of the first solvent and the second solvent; [0050] (ii) mixing and dissolving the amount A of the salt of the first boron-containing compound in the homogeneous mixture obtained from step (i), to obtain a homogenous mixture of the first solvent, the second solvent and the salt of the first boron-containing compound; [0051] (iii) mixing and dissolving the amount B of the second boron-containing compound in the homogeneous mixture obtained from step (iii), to obtain a homogeneous mixture of the first solvent, the second solvent, the salt of the first boron-containing compound and the second boron-containing compound;
to provide the fire-retardant composition wherein [0052] the amount A of the salt of the first boron-containing compound represents from 15 to 45 wt.-% of the total weight of the fire-retardant composition, [0053] the amount B of the second boron-containing compound represents from 10 to 46 wt.-% of the total weight of the fire-retardant composition, [0054] the amount C of the first solvent represents from 0.2622×the amount B to 0.3944×the amount B wt.-% of the total weight of the fire-retardant composition; and [0055] the amount D of the second solvent represents from 0.3549×the amount [0056] B to 0.4860×the amount B wt.-% of the total weight of the fire-retardant composition; and [0057] wherein 100−(the amount A+the amount B+the amount C) is greater that D; and
optionally said method further comprising a step of adding a diluent to the fire-retardant composition to adjust the viscosity a desired level, preferably said diluent being the first solvent, the second solvent or a mixture thereof. More preferably, the diluent is water.

[0058] According to another embodiment, the total amount of boron contained in the fire-retardant composition corresponds to the sum of the weight of the boron element(s) contained in the salt of the first boron-containing compound and the weight of the boron element(s) contained in the second boron-containing compound. As an example, the weight of the boron element of boric acid corresponds to 0.1748×the weight of boric acid, and the boron element of the salt of the disodium octaboron tetrahydrate corresponds to 0.20966×the weight of the disodium octaboron tetrahydrate.

[0059] According to another embodiment, the amount C of the first solvent may vary from 0.2622×the amount B of the second bore-containing compound to 0.3944×the amount B of the second bore-containing compound. Preferably, the optimal amount C of the first solvent is 0.3465×the amount B of the second bore-containing compound. As a non-limiting example, a fire-retardant composition containing 20 wt.-% of an organic solvent (e.g. monoethylamine) and 57.2 wt.-% of a second boron-containing compound (e.g. H.sub.3BO.sub.3 is 20/57.2 (i.e. 0.3465).

[0060] According to another embodiment, the amount D of the second solvent may vary from 0.3549×the amount of the second boron-containing compound B to 0.4860×the amount B of the second boron-containing compound. Preferably, the optimal amount D of the second solvent is 0.3860×the amount B of the second bore-containing compound. As a non-limiting example, a fire-retardant composition having a viscosity of 60 cps at 23° C., containing 22.28 wt.-% of the second solvent (e.g. water) and 57.72 wt.-% of a second boron-containing compound (e.g. H.sub.3BO.sub.3 is 22.28/57.72 (i.e. 0.3860).

[0061] Another embodiment of the invention relates to the method defined hereinabove, wherein the fire-retardant composition has a low viscosity.

[0062] Another embodiment of the invention relates to the method defined hereinabove, wherein the fire-retardant composition is a concentrate that is ready for a step adding a diluent to reduce the viscosity to a low viscosity before use, optionally with an agitation step.

[0063] Another embodiment of the invention relates to the method defined hereinabove, wherein the amount A varies from 35 to 45 wt.-% of the total weight of the fire-retardant composition.

[0064] Another embodiment of the invention relates to the method defined hereinabove, wherein the amount B varies from 35 to 45 wt.-% of the total weight of the fire-retardant composition.

[0065] Another embodiment of the invention relates to the method defined hereinabove, wherein steps (i) to (iii) are carried out between 20° C. and 80° C.

[0066] Another embodiment of the invention relates to the method defined hereinabove, wherein steps (i) to (iii) are carried out at about 80° C.

[0067] Another embodiment of the invention relates to the method defined hereinabove, wherein the viscosity of the fire-retardant composition varies from 20 cps to 200 cps at 23° C.

[0068] Another embodiment of the invention relates to the method defined hereinabove, wherein said fire-retardant composition has a viscosity at 23° C. that is between 50 and 70 cps.

[0069] Another embodiment of the invention relates to the method defined hereinabove, wherein the stability of the fire-retardant composition for at least one year, more preferably at least 2 years, within temperature ranges that may be comprised between temperatures lower that −10° C. and higher than 80° C., more preferably within temperature ranges varying from 10° C. to 80° C. Much more preferably, the formation of precipitate or multiphase separations is prevented, said composition may recover its original properties and viscosity (e.g. a varying from 20 to 200 cps, more preferably 40 to 80 cps, much more preferably 50 to 70 cps, in order to allow said composition to flow easily within piping), when returning to a surrounding wording environment (e.g. about 23° C.). As an example, a frozen composition recovers its original properties when rewarmed at a temperature of about 23° C.

[0070] Another embodiment of the invention relates to the method defined hereinabove, wherein the amount C in weight percent of the fire-retardant composition is of 0.2622×the amount B.

[0071] Another embodiment of the invention relates to the method defined hereinabove, wherein the amount C in weight percent of the fire-retardant composition is of 0.3060×the amount B.

[0072] Another embodiment of the invention relates to the method defined hereinabove, wherein the amount C in weight percent of the fire-retardant composition is of 0.3934×the amount B.

[0073] Another embodiment of the invention relates to the method defined hereinabove, wherein the amount C in weight percent of the fire-retardant composition is of 0.3465×the amount B.

[0074] Another embodiment of the invention relates to the method defined hereinabove, wherein the amount D in weight percent of the fire-retardant composition is of 0.3549×the amount B.

[0075] Another embodiment of the invention relates to the method defined hereinabove, wherein the amount D in weight percent of the fire-retardant composition is of 0.4860×the amount B.

[0076] Another embodiment of the invention relates to the method defined hereinabove, wherein the amount D in weight percent of the fire-retardant composition is of 0.4424×the amount B.

[0077] Another embodiment of the invention relates to the method defined hereinabove, wherein the amount D in weight percent of the fire-retardant composition is of 0.3860×the amount B.

[0078] Another embodiment of the invention relates to the method defined hereinabove, wherein the first solvent is at least one organic solvent containing in its molecule at least a nitrogen atom and/or at least one hydroxyl group.

[0079] Another embodiment of the invention relates to the method defined hereinabove, wherein the at least one organic solvent is selected from the group consisting of C.sub.1-C.sub.6 alkylamine, amino butanol, amino butanediol, 2-amino-1,3-propanediol, aminopropanol, ethanolamine, diethanolamine, triethanolamine, amino propanediol, dimethylaminopropylamine, ethylenediamine tetraacetic acid, and mixtures thereof.

[0080] Another embodiment of the invention relates to the method defined hereinabove, wherein the salt of the first boron-containing compound is selected from the group consisting of potassium borates, sodium borates, disodium octaborate tetrahydrate, dipotassium octaborate tetrahydrate, borax decahydrate, borax pentahydrate, salts of metaboric acid, salts of orthoboric acid, and mixtures thereof.

[0081] Another embodiment of the invention relates to the method defined hereinabove, wherein the second boron-containing compound is selected from the group consisting of orthoboric acid, metaboric acid, and mixtures thereof.

[0082] Another embodiment of the invention relates to the method defined hereinabove, wherein the second boron-containing compound is anhydrous boric acid.

[0083] Another embodiment of the invention relates to the method defined hereinabove, wherein the substrate is a cellulosic substrate.

[0084] Another embodiment of the invention relates to the method defined hereinabove, wherein the cellulosic substrate is selected from the group consisting of fabrics, recycled fabrics, papers, recycled papers, cardboards, recycled cardboards, cellulose fluffs, recycled cellulose fluffs, cellulose wadding, wood chips, wood particles, plywoods, etc.

[0085] Another embodiment of the invention relates to the method defined hereinabove, wherein the cellulosic substrate is recycled a newsprint paper.

[0086] Another embodiment of the invention relates to the method defined hereinabove, wherein the substrate is in the form of a shredded substrate defining a cellulosic wadding.

[0087] Another embodiment of the invention relates to a fire-retardant composition useful for protecting a substrate, said fire-retardant composition having stable physical and chemical properties and comprising [0088] a salt of a first boron-containing compound in an amount A, said salt of a first boron-containing compound being a borate salt or a mixture of borate salts; [0089] a second boron-containing compound in an amount B, said second boron-containing compound being selected from the group consisting of boric acids; [0090] a first solvent comprising at least one organic solvent, in an amount C, and a second solvent comprising water, in an amount D;
wherein [0091] the amount A of the salt of the first boron-containing compound represents from 15 to 45 wt.-% of the total weight of the fire-retardant composition, [0092] the amount B of the second boron-containing compound represents from 15 to 46 wt.-% of the total weight of the fire-retardant composition, [0093] the amount C of the first solvent represents from 0.2622×the amount B to 0.3944×the amount B wt.-% of the total weight of the fire-retardant composition; and [0094] the amount D of the second solvent represents from 0.3549×the amount B to 0.4860×the amount B wt.-% of the total weight of the fire-retardant composition; and [0095] wherein 100−(the amount A+the amount B+the amount C) is greater that D.

[0096] Another embodiment of the invention relates to the fire-retardant composition defined hereinabove, wherein the fire-retardant composition is a concentrate.

[0097] Another embodiment of the invention relates to the fire-retardant composition defined hereinabove, wherein the fire-retardant composition has a low viscosity.

[0098] Another embodiment of the invention relates to the fire-retardant composition defined hereinabove, wherein the viscosity of the fire-retardant composition varies from 20 cps to 200 cps at 23° C.

[0099] Another embodiment of the invention relates to the fire-retardant composition defined hereinabove, wherein said fire-retardant composition has a viscosity at 23° C. that is between 50 and 70 cps.

[0100] Another embodiment of the invention relates to the fire-retardant composition defined hereinabove, wherein the amount A varies from 35 to 45 wt.-% of the total weight of the fire-retardant composition.

[0101] Another embodiment of the invention relates to the fire-retardant composition defined hereinabove, wherein the amount B varies from 35 to 45 wt.-% of the total weight of the fire-retardant composition.

[0102] Another embodiment of the invention relates to the fire-retardant composition defined hereinabove, wherein the stability of the fire-retardant composition has at least one of the following preferred properties: [0103] a viscosity varying at 23° C. from 20 to 200 cps in order to flow easily within piping; and [0104] a stability against precipitation or phase separation for at least one year within temperature ranges that may be comprised between temperatures lower that −10° C. and higher than 80° C., said composition recovering its original properties and viscosity when returning to a surrounding working environment of about 23° C.

[0105] Another embodiment of the invention relates to the fire-retardant composition defined hereinabove, wherein the amount C in weight percent of the fire-retardant composition is of 0.2622×the amount B.

[0106] Another embodiment of the invention relates to the fire-retardant composition defined hereinabove, wherein the amount C in weight percent of the fire-retardant composition is of 0.3060×the amount B.

[0107] Another embodiment of the invention relates to the fire-retardant composition defined hereinabove, wherein the amount C in weight percent of the fire-retardant composition is of 0.3934×the amount B.

[0108] Another embodiment of the invention relates to the fire-retardant composition defined hereinabove, wherein the amount C in weight percent of the fire-retardant composition is of 0.3465×the amount B.

[0109] Another embodiment of the invention relates to the fire-retardant composition defined hereinabove, wherein the amount D in weight percent of the fire-retardant composition is of 0.3549×the amount B.

[0110] Another embodiment of the invention relates to the fire-retardant composition defined hereinabove, wherein the amount D in weight percent of the fire-retardant composition is of 0.4860×the amount B.

[0111] Another embodiment of the invention relates to the fire-retardant composition defined hereinabove, wherein the amount D in weight percent of the fire-retardant composition is of 0.4424×the amount B.

[0112] Another embodiment of the invention relates to the fire-retardant composition defined hereinabove, wherein the amount D in weight percent of the fire-retardant composition is of 0.3860×the amount B.

[0113] Another embodiment of the invention relates to the fire-retardant composition defined hereinabove, wherein the first solvent is at least one organic solvent containing in its molecule at least a nitrogen atom and/or at least one hydroxyl group.

[0114] Another embodiment of the invention relates to the fire-retardant composition defined hereinabove, wherein the at least one organic solvent is selected from the group consisting of C.sub.1-C.sub.6 alkylamine, amino butanol, amino butanediol, 2-amino-1,3-propanediol, am inopropanol, ethanolamine, diethanolamine, triethanolamine, amino propanediol, dimethylaminopropylamine, ethylenediamine tetraacetic acid, and mixtures thereof.

[0115] Another embodiment of the invention relates to the fire-retardant composition defined hereinabove, wherein the salt of the first boron-containing compound is selected from the group consisting of potassium borates, sodium borates, disodium octaborate tetrahydrate, dipotassium octaborate tetrahydrate, borax decahydrate, borax pentahydrate, salts of metaboric acid, salts of orthoboric acid, and mixtures thereof.

[0116] Another embodiment of the invention relates to the fire-retardant composition defined hereinabove, wherein the second boron-containing compound is selected from the group consisting of orthoboric acid, metaboric acid, and mixtures thereof.

[0117] Another embodiment of the invention relates to the fire-retardant composition defined hereinabove, wherein the second boron-containing compound is anhydrous boric acid.

[0118] Another embodiment of the invention relates to the fire-retardant composition defined hereinabove, wherein the substrate is a cellulosic substrate.

[0119] Another embodiment of the invention relates to the fire-retardant composition defined hereinabove, wherein the cellulosic substrate is selected from the group consisting of fabrics, recycled fabrics, papers, recycled papers, cardboards, recycled cardboards, cellulose fluffs, recycled cellulose fluffs, cellulosic wadding, wood chips, wood particles and plywoods.

[0120] Another embodiment of the invention relates to the fire-retardant composition defined hereinabove, wherein the cellulosic substrate is recycled a newsprint paper.

[0121] Another embodiment of the invention relates to the fire-retardant composition defined hereinabove, wherein the substrate is in the form of a shredded substrate defining a cellulosic wadding.

[0122] Another embodiment of the invention relates to a concentrate fire-retardant composition for a substrate, said fire retardant composition having stable physical and chemical properties and a low viscosity, and comprising a salt of a first boron-containing compound, a second boron-containing compound, at least one first solvent and at least one second solvent, obtained by a method as defined hereinabove.

[0123] Another embodiment of the invention relates to a fire-retardant composition for a substrate, said fire retardant composition having stable physical and chemical properties and a low viscosity, and comprising a salt of a first boron-containing compound, a second boron-containing compound, at least one first solvent and at least one second solvent, obtained by a method as defined hereinabove.

[0124] Another embodiment of the invention relates to the fire-retardant composition defined above, having at least one of the following preferred properties: [0125] A viscosity varying at 23° C. from 20 to 200 cps, more preferably 40 to 80 cps, much more preferably 50 to 70 cps, in order to allow said composition to flow easily within piping. [0126] A stability for at least one year, more preferably at least 2 years, within temperature ranges that may be comprised between temperatures lower that −10° C. and higher than 80° C., more preferably within temperature ranges varying from 10° C. to 80° C. Said composition recovers their original properties and viscosity when returning to a surrounding working environment (e.g. about 23° C.). As an example, a frozen composition recovers its original properties when rewarmed at a temperature of about 23° C. (i.e. viscosity between 50 to 70 cps).

[0127] According to another embodiment, the stable, non-viscous and efficient fire-retardant composition may further have efficient fire-retardant properties on combustible substrates, preferably porous substrates such as for example cellulosic materials (e.g. recycled paper, cardboards, chips, etc.

[0128] According to another embodiment, the stable, non-viscous and efficient fire-retardant composition may further have efficient absorption properties on cellulosic materials such as recycled paper, cardboards, chips, etc.

[0129] Another embodiment of the invention relates to a use of the fire-retardant composition defined hereinabove, for imparting fire-retardant properties of a substrate.

[0130] Another embodiment of the invention relates to a method for imparting fire-retardant properties to a substrate, wherein the fire-retardant composition defined hereinabove is contacted with the substrate.

[0131] Another embodiment of the invention relates the method defined hereinabove, wherein the substrate is a cellulosic substrate.

[0132] Another embodiment of the invention relates the method defined hereinabove, wherein the fire-retardant composition is sprayed on the cellulosic substrate.

EXAMPLES

Protocol for the Manufacture of Fire-Retardant Solutions

[0133] Step (i): A reactor was filled with an amount of water and then heated at 80° C. Then an amount of an organic solvent (monoethanolamine) was added under stirring until obtaining a homogeneous mixture.

[0134] Step (ii): An amount of a boron salt (disodium octaborate tetrahydrate—known under the trade name Etidote 67; CAS 12280-03-4) was added under stirring to the mixture obtained from step (i). Stirring was continued until complete dissolution of the boron salt.

[0135] Step (iii): An amount of boric acid (H.sub.3BO.sub.3) is added to the homogeneous mixture obtained from step (ii), under stirring. Stirring was continued until obtaining a homogeneous solution.

[0136] The selected ratio of the amount of the organic solvent/amount of the boric acid is 0.3465; and the selected ratio of the amount of water/amount of the boric acid is 0.3860. Of course, the above-mentioned ratios are only illustrative of the optimal ratios, and they will work for all other claimed ratios.

Protocol for the Application of a Fire-Retardant Solution to a Pad of Shredded Paper Obtained from a Recycled Newsprint Paper, and Measure of the Flame Retardant Properties of the Treated Pad

[0137] For each example defined hereinafter, the following sequence of steps was carried out (in triplicata): [0138] Step 1, 6 g of cellulose wadding obtained from recycled newsprint paper were formed into a small pad having a rectangular shape 6 inches×5 inches×1 inch on an inclined plate. The cellulose wadding is obtained from recycled newsprint shredded in a «Oster» kitchen mixer. More particularly, 3 gr of newsprint paper was shredded for 3 minutes in the Oster mixer to obtain 3 grams of cellulose wadding, and then the operation was repeated with 3 gr of newsprint paper to obtain another 3 grams of cellulose wadding. Thus, a total of 6 grams of cellulose wadding was obtained and shaped as a rectangular pad. Therefore, for the tests, the pad has a density of about 6 gr per 30 cubic inches. [0139] Step 2. 0.9 g of a fire-retardant solution as defined hereinafter, was sprayed with a conventional hand sprayer (e.g. a 750 ml hand sprayer), on the pad defined hereinabove. The flame-retardant solution was allowed to impregnate in the pad. [0140] Step 3″ The pad impregnated with the fire-retardant solution was exposed to the flame of a torch for 6 seconds. The torch used was of the type currently used for cutting and/or welding metals (e.g. a Mag-Torch provided with a 14.1 oz propane gas cylinder. [0141] Step 4, After the 6 seconds of step 3 mentioned above, the duration of the fire-retardant properties was measured with an electronic timer.

[0142] Also, for each example, the viscosity, and the stability of the chemical and physical properties of the fire-retardant composition were measure according to the following protocols. [0143] The viscosity was measured at 23° C. with a Brookfield Synchro-Lectric Viscosimeter. [0144] Physical properties were visually observed.

Example 1

Fire-Retardant Composition With boron at 11.8% by Weight

[0145] A fire-retardant solution was prepared according to the above-mentioned protocol. For preparing a fire-retardant solution comprising 31.5 wt.-% boric acid and 30 wt.-% Etidote 67. According to a first aspect of the invention, the amount of the first solvent (monoethanolamine) was determined to be 10.91 wt.-% (i.e. according to the equation 31.5 wt.-% of boric acid×0.3465).

[0146] Then, the theorical balance of water to reach 100 wt.-% of the solution was expected to be 27.59 wt.-% (i.e. 100 wt.-% −(31.5 wt.-%+30 wt.-%+10.91 wt.-%).

[0147] However, according to a second aspect of the invention, the amount of water was rather determined to be 12.16 wt.-% (i.e, according to the equation 31.5 wt.-% of boric acid×0.3860).

[0148] Therefore, the difference between the theorical balance of water and the real amount of water is positive (i.e. 27.59−12.16=+15.43). According to the invention, a positive result indicates when using less water, a stable product is obtained.

[0149] The product is a gel that stable (no precipitation, or separation of phase after 2 years. This gel is soluble in water and consequently, before use, can be diluted with water at a working viscosity (i.e. a viscosity which is suitable for an easy application, such as for example by spraying. Viscosity and flame-retardant properties are reported in the following tables 1 and 2.

Example 2

Fire-Retardant Composition with Boron at 8.05% by Weight

[0150] A fire-retardant solution was prepared according to the above-mentioned protocol. For preparing a fire-retardant solution comprising 31.5 wt.-% boric acid and 12 wt.-% Etidote 67. According to a first aspect of the invention, the amount of the first solvent (monoethanolamine) was determined to be 10.91 wt.-% (i.e. according to the equation 31.5 wt.-% of boric acid×0.3465).

[0151] Then, the theorical balance of water to reach 100 wt.-% of the solution was expected to be 45.6 wt.-% (i.e. 100 wt.-%−(31.5 wt.-%+12 wt.-%+10.91 wt.-%).

[0152] However, according to a second aspect of the invention, the amount of water was rather determined to be 12.16 wt.-% (i.e. according to the equation 31.5×0.3860).

[0153] Therefore, the difference between the theorical balance of water and the real amount of water is positive (i.e. 45.6−12.16=+33.44). According to the invention, a positive result indicates that when using less water, a stable fire-retardant solution is obtained

[0154] The fire-retardant solution is stable (no precipitation of separation of phase after 2 years. Viscosity and flame-retardant properties are reported in the following tables 1 and 2.

Example 3

Fire-Retardant Composition with Boron at 13.11% by Weight

[0155] A fire-retardant solution was prepared according to the above-mentioned protocol. For preparing a fire-retardant solution comprising 39 wt.-% boric acid and 30 wt.-% Etidote 67. According to a first aspect of the invention, the amount of the first solvent (monoethanolamine) was determined to be 13.51 wt.-% (i.e. according to the equation 39 wt.-% of boric acid×0.3465).

[0156] Then, the theorical balance of water to reach 100 wt.-% of the solution was expected to be 17.49 wt.-% (i.e. 100 wt.-%−(39 wt.-%+30 wt.-%+13.51 wt.-%).

[0157] However, according to a second aspect of the invention, the amount of water was rather determined to be 15.05 wt.-% (i.e. according to the equation 39 wt.-% of boric acid×0.3860).

[0158] Therefore, the difference between the theorical balance of water and the real amount of water is positive (i.e. 17.49−15.05=2.43). According to the invention, a positive result indicates that when using less water, a stable fire-retardant solution is obtained.

[0159] The fire-retardant solution is stable (no precipitation of separation of phase after 2 years. Viscosity and flame-retardant properties are reported in the following tables 1 and 2.

Example 4

Fire-Retardant Composition with Boron at 10.84% by Weight

[0160] A fire-retardant solution was prepared according to the above-mentioned protocol. For preparing a fire-retardant solution comprising 38 wt.-% boric acid and 20 wt.-% Etidote 67. According to a first aspect of the invention, the amount of the first solvent (monoethanolamine) was determined to be 13.17 wt.-% (i.e. according to the equation 38 wt.-% of boric acid×0.3465).

[0161] Then, the theorical balance of water to reach 100 wt.-% of the solution was expected to be 28.83 wt.-% (i.e. 100 wt.-%−(38 wt.-%+20 wt.-%+13.17 wt.-%).

[0162] However, according to a second aspect of the invention, the amount of water was rather determined to be 14.67 wt.-% (i.e. according to the equation 38 wt.-% boric acid×0.3860).

[0163] Therefore, the difference between the theorical balance of water and the real amount of water is positive (i.e. 28.83−14.67=14,16). According to the invention, a positive result indicates that when using less water, a stable fire-retardant solution is obtained.

[0164] The fire-retardant solution is stable (no precipitation of separation of phase after 2 years. Viscosity and flame-retardant properties are reported in the following tables 1 and 2.

Example 5

Fire-Retardant Composition with Boron at 10.14% by Weight

[0165] A fire-retardant solution was prepared according to the above-mentioned protocol. For preparing a fire-retardant solution comprising 40 wt.-% boric acid and 15.44 wt.-% Etidote 67. According to a first aspect of the invention, the amount of the first solvent (monoethanolamine) was determined to be 13.86 wt.-% (i.e. according to the equation 40 wt.-% of boric acid×0.3860).

[0166] Then, the theorical balance of water to reach 100 wt.-% of the solution was expected to be 31.14 wt.-% (i.e. 100 wt.-%−(40 wt.-%+15.44 wt.-%+13.86 wt.-%).

[0167] However, according to a second aspect of the invention, the amount of water was rather determined to be 15.44 wt.-% (i.e. according to the equation 15 wt.-%×0.3866).

[0168] Therefore, the difference between the theorical balance of water and the real amount of water is positive (i.e. 31.14−15.44=15.7). According to the invention, a positive result indicates that when using less water, a stable fire-retardant solution is obtained.

[0169] The fire-retardant solution is stable (no precipitation of separation of phase after 2 years. Viscosity and flame-retardant properties are reported in the following tables 1 and 2.

Example 6

Fire-Retardant Composition with Boron at 15.55% by Weight

[0170] A fire-retardant solution was prepared according to the above-mentioned protocol. For preparing a fire-retardant solution comprising 35 wt.-% boric acid and 45 wt.-% Etidote 67. According to a first aspect of the invention, the amount of the first solvent (monoethanolamine) was determined to be 12.13 wt.-% (i.e. according to the equation 35 wt.-% of boric acid×0.3465).

[0171] Then, the theorical balance of water to reach 100 wt.-% of the solution was expected to be 7.87 wt.-% (i.e. 100 wt.-%−(35 wt.-%+45 wt.-%+12.13 wt.-%).

[0172] However, according to a second aspect of the invention, the amount of water was rather determined to be 13.51 wt.-% (i.e. according to the equation 35 wt.-%×0.3860).

[0173] Therefore, the difference between the theorical balance of water and the real amount of water is positive (i.e. 7.87−13.51=−5.64). According to the invention, a negative result indicates when using more water that expected, an unstable fire-retardant solution is obtained.

[0174] Indeed, the fire-retardant solution is unstable (gel formation or precipitation after 2 years. Viscosity and flame-retardant properties are reported in the following tables 1 and 2.

Example 7

Fire-Retardant Composition with Boron at 10.66% by Weight

[0175] A fire-retardant solution was prepared according to the above-mentioned protocol. For preparing a fire-retardant solution comprising 37 wt.-% boric acid and 20 wt.-% Etidote 67. According to a first aspect of the invention, the amount of the first solvent (monoethanolamine) was determined to be 12.82 wt.-% (i.e. according to the equation 37 wt.-% of boric acid×0.3465).

[0176] Then, the theorical balance of water to reach 100 wt.-% of the solution was expected to be 30.18 wt.-% (i.e. 100 wt.-%−(37 wt.-%+20 wt.-%+12.82 wt.-%).

[0177] However, according to a second aspect of the invention, the amount of water was rather determined to be 14.28 wt.-% (i.e. according to the equation 37 wt.-% boric acid×0.3860).

[0178] Therefore, the difference between the theorical balance of water and the real amount of water is positive (i.e. 30.18−14.28=+15.90). According to the invention, a positive result indicates that when using less water, a stable fire-retardant solution is obtained.

[0179] The fire-retardant solution is stable (no precipitation or separation of phase after at least one year. Viscosity and flame-retardant properties are reported in the following tables 1 and 2.

Example 8

Fire-Retardant Composition with Boron at 11.71 by Weight

[0180] A fire-retardant solution was prepared according to the above-mentioned protocol. For preparing a fire-retardant solution comprising 37 wt.-% boric acid and 25 wt.-% Etidote 67. According to a first aspect of the invention, the amount of the first solvent (monoethanolamine) was determined to be 12.82 wt.-% (i.e. according to the equation 37 wt.-% of boric acid×0.3465).

[0181] Then, the theorical balance of water to reach 100 wt.-% of the solution was expected to be 25.18 wt.-% (i.e. 100 wt.-%−(37 wt.-%+25 wt.-%+12.82 wt.-%).

[0182] However, according to a second aspect of the invention, the amount of water was rather determined to be 14.28 wt.-% (i.e. according to the equation 37 wt.-% of boric acid×0.3860).

[0183] Therefore, the difference between the theorical balance of water and the real amount of water is positive (i.e. 25.18−14.28=+10.90). According to the invention, a positive result indicates that when using less water, a stable fire-retardant solution is obtained.

[0184] The fire-retardant solution is stable (no precipitation of separation of phase after 2 years. Viscosity and flame-retardant properties are reported in the following tables 1 and 2.

Example 9

Fire-Retardant Composition with Boron at 12.24% by Weight

[0185] A fire-retardant solution was prepared according to the above-mentioned protocol. For preparing a fire-retardant solution comprising 46 wt.-% boric acid and 20 wt.-% Etidote 67. According to a first aspect of the invention, the amount of the first solvent (monoethanolamine) was determined to be 15.94 wt.-% (i.e. according to the equation 46 wt.-% of boric acid×0.3465).

[0186] Then, the theorical balance of water to reach 100 wt.-% of the solution was expected to be 18.06 wt.-% (i.e. 100 wt.-%−(37 wt.-%+20 wt.-%+15.94 wt.-%).

[0187] However, according to a second aspect of the invention, the amount of water was rather determined to be 17.76 wt.-% (i.e. according to the equation 46 wt.-% of boric acid×0.3860).

[0188] Therefore, the difference between the theorical balance of water and the real amount of water is positive (i.e. 18.06−17.76=+0.31). According to the invention, a positive result indicates that when using less water, a stable fire-retardant solution is obtained.

[0189] The fire-retardant solution is stable (no precipitation of separation of phase after 2 years. Viscosity and flame-retardant properties are reported in the following tables 1 and 2.

Example 10

Fire-Retardant Composition with Boron at 9.44% by Weight

[0190] A fire-retardant solution was prepared according to the above-mentioned protocol. For preparing a fire-retardant solution comprising 36 wt.-% boric acid and 15 wt.-% Etidote 67. According to a first aspect of the invention, the amount of the first solvent (monoethanolamine) was determined to be 12.47 wt.-% (i.e. according to the equation 36 wt.-% of boric acid×0.3465).

[0191] Then, the theorical balance of water to reach 100 wt.-% of the solution was expected to be 36.53 wt.-% (i.e. 100 wt.-%−(36 wt.-%+15 wt.-%+12.47 wt.-%).

[0192] However, according to a second aspect of the invention, the amount of water was rather determined to be 13.90 wt.-% (i.e. according to the equation 36 wt.-% of boric acid×0.3860).

[0193] Therefore, the difference between the theorical balance of water and the real amount of water is positive (i.e. 36.53−13.90=+22.63). According to the invention, a positive result indicates when using less water a stable fire-retardant solution.

[0194] The fire-retardant solution is stable (no precipitation of separation of phase after 2 years. Viscosity and flame-retardant properties are reported in the following tables 1 and 2.

TABLE-US-00001 TABLE 1 Viscosity AMOUNT OF ELEMENTAL BORON VISCOSITY* EXEMPLES (wt.-%) (CPS at 23° C.) CHARACTERISTICS 1 11.8 Not available Gel** 2 8.05 20 Sprayable on CW*** 3 13.11 1940 Not sprayable on CW*** 4 10.84 190 Sprayable on CW*** 5 10.14 90 Sprayable on CW*** 6 15.55 >1940 Not sprayable on CW*** 7 10.66 190 Sprayable on CW*** 8 11.71 282.5 Not sprayable on CW*** 9 12.24 1020 Not sprayable on CW*** 10 9.44 42.5 Sprayable on CW*** *Viscosimetre Brookfield, synchro-electric, FIELD 2/60, 23.sup.9 C. ***Cellulosic wadding

TABLE-US-00002 TABLE 2 FIRE-RETARDANT TEST AMOUNT OF ELEMENTAL BORON TIME EXAMPLES (wt.-%) (sec) CHARACTERISTICS 1 11.8 9.5 Gel** 2 8.05 10.5  Applicable on CW*** 3 13.11 ND Not applicable on CW*** 4 10.84 8.5 Applicable on CW*** 5 10.14 8.0 Applicable on CW*** 6 15.55 ND Not applicable on CW*** 7 10.66 8.0 Applicable on CW*** 8 11.71 7.0 Not applicable on CW*** 9 12.24 ND Not applicable on CW*** 10 9.44 7.0 Applicable on CW*** **Sprayed on CW*** after dilution with water at a viscosity of about 60 cps ***Cellulosic wadding

[0195] The above description of the embodiments should not be interpreted in a limiting manner since other variations, modifications and refinements are possible within the scope of the present invention. Accordingly, it should be understood that various features and aspects of the disclosed embodiments can be combined with or substituted for one another in order to form varying modes of the disclosed invention. The scope of the invention is defined in the appended claims and their equivalents.