Formulation comprising carnauba wax and at least one particular sorbitan monoester

Abstract

The present invention deals with a formulation comprising at least one ethoxylated C.sub.13-C.sub.19 sorbitan monoester, saturated or not; and carnauba wax. Furthermore, the present invention pertains to a coating dilution comprising said formulation and the use of the formulation or of the coating dilution as a cold-end coating on a glass-container.

Claims

1. A formulation comprising: between 2.5 wt % and less than 8.5 wt % of at least one ethoxylated C13-C19 sorbitan monoester, saturated or not, relative to a total formulation weight; carnauba wax, and particles, wherein in a number-based particle size distribution of the particles of the formulation, at least 50% of the particles have a size greater than 100 nanometers according to the number-based distribution analysis method.

2. The formulation according to claim 1, comprising from 11 to 25 wt % of carnauba wax relative to the total formulation weight.

3. The formulation according to claim 1, wherein a total weight of the carnauba wax and the at least one ethoxylated C13-C19 sorbitan monoester is between more than 12 and less than 35 wt %, relative to the total formulation weight.

4. The formulation according to claim 1, wherein a weight ratio R, defined by a ratio between a percentage in weight of the carnauba wax and a percentage in weight of the at least one ethoxylated C13-C19 sorbitan monoester is from 2.5 to 5.

5. The formulation according to claim 1, wherein the at least one ethoxylated C13-C19 sorbitan monoester has a hydrophile-lipophile balance from 13 to 17.

6. The formulation according to claim 1, wherein the at least one ethoxylated C13-C19 sorbitan monoester comprises more than 5 ethylene oxide groups.

7. The formulation according to claim 1, wherein the at least one ethoxylated C13-C19 sorbitan monoester is selected from the group consisting of sorbitan monostearate, sorbitan monopalmitate and sorbitan monooleate.

8. The formulation according to claim 1, further comprising one or more additional additives selected from the group consisting of biocides, bactericides, preservatives, ester alcohol, glycol ether, dyes, emulsion destabilizers, perfumes, odorants, UY absorbers, light absorbers, impact absorbers, surfactants other than sorbitan esters, oils other than mineral oils and the like.

9. The formulation according to claim 1, comprising more than 60 wt % of the carnauba wax relative to a total wax weight.

10. A coating dilution comprising the formulation according to claim 1.

11. The coating dilution according to claim 10, comprising from 0.5 to 10 wt % of the formulation relative to a total weight of the coating dilution.

12. A cold-end coating on a glass surface comprising the formulation according to claim 1.

13. Coating process comprising at least a step a) of applying the formulation according to claim 1 to a glass surface.

14. The coating process of claim 13, further comprising a previous step a) of applying a metal oxide treatment to the glass surface.

15. Glass surface obtainable by the process of claim 13.

Description

EXAMPLES

(1) Carnauba wax is used, having a melting point (range) from 82 to 86 C. and having an acid number from 2 to 10 mg KOH/g. Hereafter, carnauba wax is called (CW).

(2) Candelilla wax is used having a melting point (range) from 69 to 73 C. and having an acid number from 12 to 22 mg KOH/g.

(3) Sunflower seed wax is used having a melting point (range) from 74 to 78 C. and having an acid number from 17 to 22 mg KOH/g.

(4) PE wax PED 521 is used having a melting point of 105 C. and having an acid number from 5 to 25 mg KOH/g.

(5) Tween 40 (polyoxyethylene sorbitan monopalmitate) is used, having an HLB of 15.6. Hereafter, Tween 40 is called (T40).

(6) Tween 60 (polyoxyethylene sorbitan monostearate) is used, having an HLB of 14.9. Hereafter, Tween 60 is called (T60).

(7) Tween 80 (polyoxyethylene sorbitan monooleate) is used, having an HLB of 15.0. Hereafter, Tween 80 is called (T80).

(8) Tween 65 (polyoxyethylene sorbitan tristearate) is used, having an HLB of 10.5. Hereafter, Tween 65 is called (T65).

(9) Tween 85 (polyoxyethylene sorbitan trioleate) is used, having an HLB of 10.5. Hereafter, Tween 85 is called (T85).

(10) PEG 40 stearate (polyoxyethylene (40) stearate) is used having an HLB of 17.5.

(11) Surfaline OX 1307L (Oxo C13 alcohol ethoxylates) is used, having an HLB of 12.1. Hereafter, Surfaline OX 1307L is called (S13).

(12) Tween 40, Tween 60, Tween 80, Surfaline OX 1307L, Tween 65 and Tween 85 are different surfactants.

Example 1

(13) Several aqueous dispersions involving the abovementioned products are prepared according to the general following procedure. Carnauba wax, the surfactant and a first portion (80 g) of water are mixed. The mixture is then stirred and heated up to 95 C. The mixture is then held for 15 minutes. Next, the mixture is quickly cooled down in ice-water. Once the temperature is below 70 C., a second portion (40 g) of water is added.

(14) Several formulations are prepared according to the table 1 below. The contents are expressed in weight percentage.

(15) TABLE-US-00001 TABLE 1 Formulation 1 2 3 4 5 6 7 CW 11.7 11.8 11.7 11.8 11.7 11.7 11.7 T40 3.2 2.5 T60 3.2 2.5 T80 3.2 2.8 S13 3.2 Water Qsp 100 Qsp 100 Qsp 100 Qsp 100 Qsp 100 Qsp 100 Qsp 100

(16) The size of the particles present in the formulations obtained has been measured. The results are presented in the table 2 below thanks to Q0, 50 value, expressed in nm.

(17) Q0, 50 designates the value at which 50% of the particles have a size above said value, based on number distribution, as previously described.

(18) TABLE-US-00002 TABLE 2 Formulation 1 2 3 4 5 6 7 Q0, 50 (nm) 132 181 128 170 131 140 58

(19) It is clearly observed that the formulations according to the invention have a Q0, 50 above 100 nm, whereas the formulation according to the prior art has a Q0, 50 below 100 nm.

Example 2

(20) Some other formulations are prepared according to the table 3 below. The contents are expressed in weight percentage.

(21) TABLE-US-00003 TABLE 3 Formulation 8 9 10 10 11 12 CW 20 20 20 25 25 25 T40 4.2 5.5 6.7 5.3 6.8 8.3 Water Qsp 100 Qsp 100 Qsp 100 Qsp 100 Qsp 100 Qsp 100

(22) The size of the particles presents in the formulation obtained has been measured. The results are presented in the table 4 below thanks to Q0, 50 value, expressed in nm.

(23) TABLE-US-00004 TABLE 4 Formulation 8 9 10 11 12 13 Q0, 50 (nm) 194 149 121 192 161 132

(24) It is clearly observed that the formulations according to the invention have a Q0, 50 above 100 nm.

(25) Furthermore, coating dilutions comprising formulations have been prepared. Then the coating dilutions have been applied to a glass surface. The scratch resistance has been tested. It has been found that the scratch resistance was comparable to a standard CEC formulation. This means that the coating dilution of the present invention, used as a cold end coating, is efficient.

Example 3Comparative Formulations

(26) Formulations A and B are prepared according to table 5 below according to the protocol detailed in example 1. The contents are expressed in weight percentage.

(27) TABLE-US-00005 TABLE 5 Formulation A B Candelilla wax 11.9 Sunflower seed wax 11.9 PE wax T40 3.9 3.9 Water Qsp 100 Qsp 100

(28) No stable suspension could be obtained with both formulations A and B and therefore no assessment of the particles size could be achieved.

Example 4Comparative Formulation

(29) Formulation C is prepared according to table 6 below. The contents are expressed in weight percentage.

(30) TABLE-US-00006 TABLE 6 Formulation C PE wax 11.6 T40 3.9 KOH 0.5 Water Qsp 100

(31) No stable suspension could be obtained with formulation C and therefore no assessment of the particles size could be achieved.

Example 5Comparative Formulations

(32) Formulations D, E and F are prepared according to table 7 below according to the protocol detailed in example 1. The contents are expressed in weight percentage.

(33) TABLE-US-00007 TABLE 7 Formulation D E F Carnauba wax 11.6 11.6 11.6 TW65 3.9 PEG-40 stearate 3.9 TW85 3.9 Water Qsp 100 Qsp 100 Qsp 100

(34) No stable suspension could be obtained with formulations D, E and F and therefore no assessment of the particles size could be achieved.