W/O emulsion for impregnating nonwoven fabric

Abstract

The invention relates to a W/O emulsion for impregnating nonwoven containing 10-60% by weight of vegetable oil, 0.1-25% by weight of emollients, 10 to 50% by weight of water, a lipophilic emulsifier, an inorganic salt as well as at least one antioxidant, wherein the emulsifier is polyglyceryl-4-diisostearate/polyhydroxystearate/sebacate and the viscosity of the emulsion is 250-600 mPa.Math.s, determined using a DIN measuring system 33 according to ISO 53019 at a temperature of 293.15 K and at a rotation speed of 500 r/min.

Claims

1. A W/O emulsion for impregnating nonwoven containing 10-60% by weight of vegetable oil, 0.1-25% by weight of emollients, 10 to 50% by weight of water, a lipophilic emulsifier, an inorganic salt, at least one antioxidant, wherein the emulsifier is polyglyceryl-4-diisostearate/poly-hydroxystearate/sebacate and the viscosity of the emulsion is 250-600 mPa.Math.s, determined using a DIN measuring system 33 according to ISO 53019 at a temperature of 293.15 K and at a rotation speed of 500 r/min, and wherein the emulsifier polyglyceryl-4-diisostearate/poly-hydroxystearate/sebacate is contained in the W/O emulsion in a ratio of 1:10 to 1:20 to the oil phase.

2. The W/O-emulsion according to claim 1, wherein the vegetable oil is selected from the group comprising sunflower oil, rapeseed oil, almond oil, jojoba oil, avocado oil, coconut oil and mixtures thereof.

3. The W/O-emulsion according to claim 1, wherein the emollients contain ester oil and/or dialkyl ether.

4. The W/O-emulsion according to claim 1, wherein the proportion by weight of antioxidant is 0.01-0.025% by weight per % by weight of oil phase.

5. A process for production of a W/O-emulsion according to claim 1, wherein an aqueous phase containing water, an inorganic salt and at least one antioxidant, is given into an oil phase with stirring, wherein the oil phase contains the emulsifier polyglyceryl-4 diisostearate/polyhydroxystearate/sebacate.

6. The process according to claim 5, wherein the preparation of the W/O-emulsion takes place entirely at room temperature.

7. A wet wipe comprising a nonwoven, wherein the nonwoven is impregnated with a W/O-emulsion according to claim 1.

8. A process for production of a wet wipe according to claim 7, wherein the W/O-emulsion is applied onto the nonwoven by means of a nozzle unit (1) having a plurality of outlet tubes (2), wherein each outlet tube (2) has a plurality of outlet openings (3), arranged in a depression (5) arranged in longitudinal direction of the outlet tube (2) and extending over at least a portion of the length (4) of the outlet tube (2).

9. The process according to claim 8, wherein the W/O-emulsion upon emerging from the outlet openings (3) arranged in the outlet tubes (2) initially accumulates in the depression (5) and subsequently is applied to the nonwoven.

Description

DETAILED DESCRIPTION OF THE INVENTION

(1) The invention will now be described in more detail using exemplary embodiments and with reference to the figures, which schematically show

(2) in FIG. 1 an outlet tube known from the prior art for applying impregnant onto nonwoven,

(3) in FIG. 2 an outlet tube for applying the emulsion onto nonwoven used in a method according to the invention for producing a wet wipe,

(4) in FIG. 3 a further outlet tube for applying the emulsion onto nonwoven used in a method according to the invention for producing a wet wipe, and

(5) in FIG. 4 a nozzle unit used in a method according to the invention for producing a wet wipe.

(6) First, the preparation of W/O-emulsions according to the invention is described by means of the following two examples, each of which contains a frame formulation for W/O-emulsions according to the invention. The weight proportions of the individual ingredients in the emulsions can vary within the specified range each time.

EXAMPLE 1: PREPARATION OF A W/O-EMULSION ACCORDING TO THE INVENTION ON THE BASIS OF Rapeseed Oil

(7) Table 1 contains a frame formulation for a W/O-emulsion according to the invention based on rapeseed oil.

(8) All ingredients labeled “Phase A” are components of the aqueous phase, all ingredients labeled “Phase B” are components of the oil phase.

(9) TABLE-US-00001 TABLE 1 Frame formulation of a W/O-emulsion based on rapeseed oil Concentration Ingredients (% by weight) Phase Water Ad 100.00 A Rapeseed Oil 25.00-50.00 B Rosemary extract 0.01-0.10 B Magnesium sulfate 1.50 A Polyglyceryl-4-diisostearate/ 1.50-3.00 B polyhydroxystearate/sebacate Glycerin 1.00-5.00 A Citric acid 0.20 A Sodium benzoate 0.50 A Perfume 0.01-0.40 B

(10) For the preparation of the aqueous phase, at first the required amount of water is placed in a vessel at room temperature. Subsequently, magnesium sulfate, glycerin, citric acid and sodium benzoate are added also at room temperature and it is stirred until a clear solution is obtained.

(11) For the preparation of the oil phase, rapeseed oil is placed in a second vessel at room temperature. Now, rosemary extract, the emulsifier polyglyceryl-4-diisostearate/polyhydroxystearate/sebacate and perfume are added and it is stirred until a clear oil phase is obtained.

(12) Subsequently, the aqueous phase is added to the oil phase under vigorous stirring and homogenization, whereby the W/O-emulsion according to the invention is obtained.

(13) The viscosity of the obtained W/O-emulsion according to the frame formulation given in Table 1 is 350-500 mPa.Math.s (determined using DIN measuring system 33 according to ISO 53019 at a temperature of 293.15 K and at a rotation speed of 500 r/min), wherein the viscosity can be influenced within this frame by the intensity of the homogenization. Therein, brief homogenization leads to viscosities in the lower range of the specified frame, and longer homogenization leads to viscosities in the upper range of the specified frame.

EXAMPLE 2: PREPARATION OF A W/O-EMULSION ACCORDING TO THE INVENTION ON THE BASIS OF SUNFLOWER OIL

(14) Table 2 contains a frame formulation for a W/O-emulsion according to the invention based on sunflower oil.

(15) All ingredients labeled “Phase A” are components of the aqueous phase, all ingredients labeled “Phase B” are components of the oil phase.

(16) TABLE-US-00002 TABLE 2 Frame formulation of a W/O-emulsion based on sunflower oil Concentration Ingredients (% by weight) Phase Water Ad 100.00 A Sunflower Oil 15.00-30.00 B Rosemary extract 0.01-0.10 B Magnesium sulfate 0.25-0.75 A Polyglyceryl-4-diisostearate/ 0.75-2.00 B polyhydroxystearate/sebacate Ethylhexyl stearate  5.00-10.00 B Glycerin 1.00-5.00 A Isopropyl myristate  5.00-10.00 B Citric acid 0.15 A Almond oil 0.5-5.0 B Sodium benzoate 0.50 A Perfume 0.01-0.40 B

(17) For the preparation of the aqueous phase, at first the required amount of water is placed in a vessel at room temperature. Subsequently, magnesium sulfate, glycerin, citric acid and sodium benzoate are added also at room temperature and it is stirred until a clear solution is obtained.

(18) For the preparation of the oil phase, sunflower oil is placed in a second vessel at room temperature. Now, rosemary extract, the emulsifier polyglyceryl-4-diisostearate/polyhydroxystearate/sebacate, ethylhexyl stearate, isopropyl myristate, almond oil and perfume are added and it is stirred until a clear oil phase is obtained.

(19) Subsequently, the aqueous phase is added to the oil phase under vigorous stirring and homogenization, whereby the W/O-emulsion according to the invention is obtained.

(20) The viscosity of the obtained W/O emulsion according to the frame formulation given in Table 2 is 330-400 mPa.Math.s (determined using DIN measuring system 33 according to ISO 53019 at a temperature of 293.15 K and at a rotation speed of 500 r/min), wherein the viscosity can be influenced within this frame by the intensity of the homogenization. Therein, brief homogenization leads to viscosities in the lower range of the specified frame, and longer homogenization leads to viscosities in the upper range of the specified frame.

EXAMPLE 3: PREPARATION OF A FURTHER W/O-EMULSION ACCORDING TO THE INVENTION ON THE BASIS OF RAPESEED OIL

(21) Table 3 contains a frame formulation for a W/O-emulsion according to the invention based on rapeseed oil.

(22) All ingredients labeled “Phase A” are components of the aqueous phase, all ingredients labeled “Phase B” are components of the oil phase.

(23) TABLE-US-00003 TABLE 3 Frame formulation of a W/O-emulsion based on rapeseed oil Concentration Ingredients (% by weight) Phase Water Ad 100.00 A Rapeseed Oil 15.00-30.00 B Rosemary extract 0.01-0.10 B Magnesium sulfate 0.25-0.75 A Polyglyceryl-4-diisostearate/ 0.75-2.00 B polyhydroxystearate/sebacate Ethylhexyl stearate  5.00-10.00 B Glycerin 1.00-5.00 A Dicaprylyl ether  5.00-10.00 B Citric acid 0.15 A Coconut oil 0.25-5.00 B Sodium benzoate 0.50 A Perfume 0.01-0.40 B Olive oil 0.25-5.00 B

(24) For the preparation of the aqueous phase, the required amount of water is first placed in a vessel at room temperature. Subsequently, magnesium sulfate, glycerin, citric acid and sodium benzoate are added also at room temperature and it is stirred until a clear solution is obtained.

(25) For the preparation of the oil phase, rapeseed oil is placed in a second vessel at room temperature. Now, rosemary extract, the emulsifier polyglyceryl-4-diisostearate/polyhydroxy-stearate/sebacate, ethylhexyl stearate, dicaprylyl ether, coconut oil, olive oil and perfume are added and it is stirred until a clear oil phase is obtained.

(26) Subsequently, the aqueous phase is added to the oil phase under vigorous stirring and homogenization, whereby the W/O-emulsion according to the invention is obtained.

(27) The viscosity of the obtained W/O emulsion according to the frame formulation given in Table 3 is 250-400 mPa.Math.s (determined using DIN measuring system 33 according to ISO 53019 at a temperature of 293.15 K and at a rotation speed of 500 r/min), wherein the viscosity can be influenced within this frame by the intensity of the homogenization. Therein, brief homogenization leads to viscosities in the lower range of the specified frame, and longer homogenization leads to viscosities in the upper range of the specified frame.

(28) FIG. 1 shows an outlet tube 2 for applying impregnant to nonwoven which is known from the prior art. In the depicted embodiment, the outlet tube 2 is curved and has outlet openings 3 distributed over its entire length, through which impregnant, which according to the prior art is usually an O/W-emulsion, can be applied uniformly onto nonwoven.

(29) W/O-emulsions according to the invention, e.g. prepared according to Example 1 or Example 2, have a higher viscosity than O/W emulsions. If one would attempt to apply an emulsion according to the invention onto nonwoven in the way known from the prior art by means of the outlet tubes 2 shown in FIG. 1, this would lead to an uneven or selective impregnation of the nonwoven, respectively, due to the higher viscosity.

(30) Therefore, the nozzle unit 1 shown schematically in FIG. 4, having several of the curved outlet tubes 2 shown in FIG. 2 and several of the straight outlet tubes 2 shown in FIG. 3 is used for production of wet wipes according to the invention impregnated with W/O-emulsion. Therein, both the curved outlet tubes 2 and the straight outlet tubes 2 have outlet openings 3 which are arranged in an, e.g. milled, depression 5 extending in a longitudinal direction of the outlet tubes 2. The depression 5 having the outlet openings 3 arranged therein can extend over the entire length 4 of the outlet tubes 2 (as depicted in FIG. 3) or only over a portion of their length (as shown in FIG. 2). Preferably, the outlet tubes 2 have outlet openings 2 arranged only in the depression 5, such that the W/O-emulsion emerging from the outlet openings 2 directly comes into the depression 5. In this way, when emulsion emerges through the outlet openings 3, the depression 5 fills like a liquid reservoir and can be applied uniformly to the nonwoven upon contacting.

(31) The features of the invention disclosed in the above description and in the claims may be essential both individually and in any combination for the realization of the invention in its various embodiments.