USE OF FATTY ACID-MODIFIED RESINS TO CONFER ANTI-FINGERPRINT PROPERTY TO A GLASS SHEET

Abstract

The invention relates to the use of a coating comprising at least one fatty-acid modified resin as an anti-fingerprint coating on a least one face of a glass sheet. In particular, the invention allows to provide an anti-fingerprint solution to be used for a glass sheet, which does not significantly affect the surface properties and the aesthetics of the coated glass compared to the naked glass. Moreover, the invention allows to provide an anti-fingerprint solution to be used for a glass sheet, which is sustainable in time and/or wearing of the surface.

Claims

1. A coating comprising at least one fatty acid-modified resin, wherein: the coating is arranged as an anti-fingerprint coating on at least one face of a glass sheet, and said fatty acid modified resin is a resin which has been structurally modified by grafted fatty acid functional groups, wherein said fatty acid functional groups are carboxylate ester functional groups with a long alkyl chain, which is either saturated or mono or poly unsaturated, conjugated or not, branched or not.

2. The coating according to claim 1, wherein the coating, once dried and/or cross-linked, comprises from 15% to 100% by weight of the fatty acid-modified resin.

3. The coating according to claim 2, wherein the coating, once dried and/or cross-linked, comprises from 50% to 100% by weight of the fatty acid-modified resin.

4. The coating according to claim 1, wherein the resin from the at least one fatty acid-modified resin is a polyol, polyurethane, polyester, polyacrylic, polyacrylate, polymethacrylate, acrylamide, melamine, polycarbonate, acrylic-styrene, vinyl-acrylic, polyolefine, polyurea, polyamide, epoxy, epoxy ester, epoxy acrylate, phenolic, amino, PVC, or PVB.

5. A coated glass sheet, comprising the coating according to claim 1 arranged on at least one face of the glass sheet.

6. The coated glass sheet according to claim 5, wherein the coating, once dried and/or cross-linked, comprises from 15% to 100% by weight of the fatty acid-modified resin.

7. The coated glass sheet according to claim 6, wherein the coating, once dried and/or cross-linked, comprises from 50% to 100% by weight of the fatty acid-modified resin.

8. The coated glass sheet according to claim 5, wherein the resin from the at least one fatty acid-modified resin is a polyol, polyurethane, polyester, polyacrylic, polyacrylate, polymethacrylate, acrylamide, melamine, polycarbonate, acrylic-styrene, vinyl-acrylic, polyolefine, polyurea, polyamide, epoxy, epoxy ester, epoxy acrylate, phenolic, amino, PVC, or PVB.

9. A method, comprising applying a coating to at least one face of a glass sheet, wherein: the coating comprises at least one fatty-acid modified resin, said fatty acid modified resin is a resin which has been structurally modified by grafted fatty acid functional groups, and said fatty acid functional groups are carboxylate ester functional groups with a long alkyl chain, which is either saturated or mono or poly unsaturated, conjugated or not, branched or not.

10. The method according to claim 9, wherein the coating, once dried and/or cross-linked, comprises from 15% to 100% by weight of the fatty acid-modified resin.

11. The method according to claim 10, wherein the coating, once dried and/or cross-linked, comprises from 50% to 100% by weight of the fatty acid-modified resin.

12. The method according to claim 9, wherein the resin from the at least one fatty acid-modified resin is a polyol, polyurethane, polyester, polyacrylic, polyacrylate, polymethacrylate, acrylamide, melamine, polycarbonate, acrylic-styrene, vinyl-acrylic, polyolefine, polyurea, polyamide, epoxy, epoxy ester, epoxy acrylate, phenolic, amino, PVC, or PVB.

Description

EXAMPLES

1) Preparation

a) Examples 1-12

[0069] Coating Preparation:

[0070] (a) g of a commercially available fatty-acid modified resin from Sartomer Company (reference CN116: fatty acid modified bisphenol A epoxy acrylate; or reference CN113D70: fatty acid modified trifunctional epoxy acrylate) was diluted with (b) g of a SR9020 dilutant from Sartomer Company.

[0071] (c) g 2-Hydroxy-2-methylpropiophenone (photo-initiator) and (d) g of Silquest A189 (silane) were then successively added.

[0072] The mixture was then gently mixed to avoid any air bubble incorporation.

[0073] Coating Deposition:

[0074] A glass sheet, consisting of a 100100 mm soda-lime clear glass plate (Planibel clear, thickness: 4 mm) was cleaned classically with a washing machine using alkaline detergent. Quickly after cleaning, the application of the coating previously prepared was done on the cooled down glass sheet using a spin coater (amount: 1.5 g, rotation speed: 8000 rpm, acceleration: 2500 rpm-1, duration: 30 sec.). The UV reticulation of the coating was then performed using a UV curing system Nathgraph UV Cure-365 nm-30 minutes.

[0075] Such an application gives a dry thickness film (DTF) of (e) m.

[0076] Table 1 presents experimental (a) to (e) values for examples 1-12.

TABLE-US-00002 TABLE 1 Commercial liquid (a) (b) (c) (d) (e) EX. epoxy acrylate used [g] [g] [g] [g] [microns] 1 CN116 49 0 4 0.2 34 2 CN116 48 0 8 0.2 28 3 CN116 24 0 16 0.1 26 4 CN116 20.25 3.75 16 0.1 36 5 CN116 16.5 7.5 16 0.1 7.5 6 CN116 12.75 11.25 16 0.1 4 7 CN113D70 49 0 4 0.2 27 8 CN113D70 48 0 8 0.2 21 9 CN113D70 24 0 16 0.1 19 10 CN113D70 20.25 3.75 16 0.1 22 11 CN113D70 16.5 7.5 16 0.1 28 12 CN113D70 12.75 11.25 16 0.1 21

b) Example 13

[0077] Coating Preparation:

[0078] A solution (A) was prepared by mixing the following components, at room temperature under gentle mixing:

TABLE-US-00003 Bayhydrol UH 2593/1 from Bayer Company (an aliphatic, 26.47 g fatty acid-modified, anionic polyurethane dispersion): Butyl diglycol (CAS 112-34-5, solvent): 1.39 g BYK 346 (surfactant): 0.12 g Deionized water: 1.46 g

[0079] A solution (B) was prepared by mixing the following components, at room temperature under gentle mixing:

TABLE-US-00004 Dipropylene glycol (CAS 25265-71-8, solvent): 0.49 g Silquest A189: 0.06 g

[0080] Just before coating deposition, solution (A) and solution (B) were gently mixed together.

[0081] Coating Deposition:

[0082] A glass sheet, consisting of a 100100 mm soda-lime clear glass plate (Planibel clear, thickness: 4 mm) was cleaned classically with a washing machine using alkaline detergent. Quickly after cleaning, the application of the coating previously prepared was done on the cooled down glass substrate using a spin coater (amount: 1.5 g, rotation speed: 8000 rpm, acceleration: 2500 rpm-1, duration: 30 sec.). Sample was thermally dried using IR lamps furnace at 130 for 5 minutes. Such an application gives a dry thickness film (DTF) of 10 m.

Examples 14-16

[0083] Coating Preparation:

[0084] The following commercially available resins were used in those examples: [0085] Macrynal VSM2521 (Allnex Company): a fatty acid modified water-based acrylic resin; [0086] Bayhydrol UH 2593/1 (Bayer Company): an aliphatic, fatty acid-modified, anionic polyurethane dispersion; [0087] Daotan TW7000 (Allnex Company): a polyurethane resin; [0088] Resydrol AY 5537W (Allnex Company): a water-based polyester/acrylate resin.

[0089] Coating for examples 14-16 were prepared following Table 2 below.

TABLE-US-00005 TABLE 2 Daotan Macrynal Bayhydrol Resydrol Silquest TW7000 2521 UH 2593/1 AY 5537W A189 EX. [g] [g] [g] [g] [g] 14 24.95 24.95 0.10 15 12.50 12.50 24.90 0.10 16 24.95 24.95 0.10

[0090] Coating Deposition:

[0091] A glass sheet, consisting of a 100100 mm soda-lime clear glass plate (Planibel clear, thickness: 4 mm) was cleaned classically with a washing machine using alkaline detergent. Quickly after cleaning, the application of the coating previously prepared was done on the cooled down glass substrate using a spin coater (amount: 1.5 g, rotation speed: 8000 rpm, acceleration: 2500 rpm-1, duration: 30 sec.). Samples are thermally dried using IR lamps furnace at 130 for 5 minutes. Such an application gives a dry thickness film (DTF) of 8.5, 2.4 and 5.5 m respectively for examples 14, 15 and 16. from 1 to 20 m.

c) Example 17

[0092] The following commercially available fatty-acid modified resin was used in this example: Neorad E-20 from DSM Company (a fatty acid modified bisphenol A epoxy acrylate).

[0093] Coating Deposition:

[0094] A glass sheet, consisting of a 100100 mm soda-lime clear glass plate (Planibel clear, thickness: 4 mm) was cleaned classically with a washing machine using alkaline detergent. Quickly after cleaning, the application of the coating previously prepared was done on the cooled down glass substrate using a spin coater (amount: 1.5 g, rotation speed: 8000 rpm, acceleration: 2500 rpm-1, duration: 30 sec.). Samples are thermally dried using IR lamps furnace at 130 for 5 minutes. Such an application gives a dry thickness film (DTF) of 10 m.

d) Examples 18-19 (Comparative)

[0095] The following commercially available resins from Allnex Company were used in those examples (those resins are not modified with fatty-acid functions): [0096] Daotan TW7000: a polyurethane resin; [0097] Resydrol AY 5537W: a water-based polyester/acrylate resin.

[0098] Coating for examples 18-19 were prepared following Table 3 below.

TABLE-US-00006 TABLE 3 Daotan Silquest Resydrol EX. TW7000 A189 AY 5537W 18 49.90 0.10 19 0.10 49.90

[0099] Coating Deposition:

[0100] A glass sheet, consisting of a 100100 mm soda-lime clear glass plate (Planibel clear, thickness: 4 mm) was cleaned classically with a washing machine using alkaline detergent. Quickly after cleaning, the application of the coating previously prepared was done on the cooled down glass substrate using a spin coater (amount: 1.5 g, rotation speed: 8000 rpm, acceleration: 2500 rpm-1, duration: 30 sec.). Samples are thermally dried using IR lamps furnace at 130 for 5 minutes. Such an application gives a dry thickness film (DTF) of 5.9 and 6.9 m respectively for examples 18 and 19 from 1 to 20 m.

2) Anti-Fingerprint Property Evaluation

[0101] Anti-fingerprint property of each of examples 1-19 was assessed as follows:

[0102] (i) Fingerprint deposition by natural deposition: deposition of a real fingerprint by contacting a finger bestriding two samples (the coated sample and its reference without coating) with a constant and reproducible load.

[0103] (ii) Fingerprint evaluation: Pictures of the imprinted samples were all taken in a black box (black-painted wooden box) with a front light condition (pair of lights close to the camera)

[0104] Evaluation of the visibility of the imprinted fingerprints on the samples and their reference was performed on the pictures, using the quotation system exposed above.

[0105] Results of this anti-fingerprint evaluation for each examples are given in Table 4.

[0106] This table shows that use of fatty acid-modified resins in a coating according to the invention well allows to get a significant anti-fingerprint property, especially when compared to the corresponding naked glass sheet (reference is quotation 0) and compared to a glass sheet covered with a coating of resin not modified by fatty-acid (comparative examples 18-19, with a quotation 0).

[0107] The anti-fingerprint property given by the invention is illustrated in FIG. 1, showing the picture taken for evaluation example 1. FIG. 2 illustrates anti-fingerprint property of example 18 (resin not modified by fatty-acid. For each of FIGS. 1 and 2, left part (a) of the picture represents coated sheet and right part (b) represents corresponding uncoated sheet acting as a reference.

TABLE-US-00007 TABLE 4 EX. Quotation 1 +2 2 +2 3 +2 4 +2 5 +2 6 +2 7 +2 8 +2 9 +2 10 +2 11 +2 12 +2 13 +2 14 +2 15 +2 16 +2 17 +2 18 (comp) 0 19 (comp) 0