Anti-fog coating comprising aqueous polymeric dispersion, crosslinker and acid or salt of polyalkylene oxide

Patent metadata

Field	Value
Publication number	US-10048408-B2
Application number	US-201214361076-A
Country	US
Kind code	B2
Filing date	Nov 1, 2012
Priority date	Dec 15, 2011
Publication date	Aug 14, 2018
Grant date	Aug 14, 2018

Abstract

Coating compositions are described comprising an aqueous polymeric dispersion; a crosslinker; and an acid or salt of a polyalkylene oxide. Also described are articles comprising the dried and cured coating composition disposed on a substrate as well as a method a providing an anti-fog coating on a substrate.

First claim

What is claimed is:

1. A coating composition comprising
an aqueous polymeric dispersion;
a crosslinker comprising an aziridine crosslinker; and
a polyalkylene oxide backbone terminating with an acid or salt group on each end, wherein the polyalkylene oxide backbone comprises a copolymer of polyethylene oxide and polypropylene oxide, and wherein the polyalkylene oxide backbone is linked to the acid or salt group on each end by a divalent linking group, the divalent linking group selected from:
—CH 2 NHCOC 2 H 4 —, —NHCONH—, —(C═O)—O—, —CONH—, —COS—, —CS 2 —, —S—, —O—, and —SCONH—.

2. The coating composition of claim 1
wherein the aqueous polymeric dispersion comprises a carboxylate-containing polymer selected from a polyurethane polymer, an acrylic polymer, or a mixture thereof, and wherein the carboxylate-containing polymer is present in the dried and cured coating composition in an amount of at least about 40 wt %.

3. The coating composition of claim 2 wherein the polymer comprises carbonate moieties.

4. The coating composition of claim 1 wherein the polyalkylene oxide comprises 10 to 100 repeat units selected from ethylene oxide and propylene oxide.

5. The coating composition of claim 4 wherein the ratio of ethylene oxide repeat units to propylene oxide repeat units is at least 2:1.

6. The coating composition of claim 1 wherein the crosslinker further comprises a pH sensitive carbonate crosslinker, a carbodiimide crosslinker, or a mixture thereof.

7. The coating composition of claim 1 wherein the aziridine crosslinker comprises alkylene oxide repeat units.

8. The coating composition of claim 1 wherein the coating composition comprises at least 10 wt % solids of aziridine crosslinker.

9. The coating composition of claim 1 wherein the coating composition further comprises a surfactant.

10. The coating composition of claim 9 wherein the surfactant is a nonionic surfactant.

11. The coating composition of claim 10 wherein the surfactant comprises polyalkylene oxide repeat units.

12. The coating composition of claim 9 wherein the coating composition comprises a silicone surfactant, an ionic surfactant, or a mixture thereof.

13. The coating composition of claim 1 wherein the dried and cured coating comprises inorganic oxide nanoparticles.

14. The coating composition of claim 13 wherein the inorganic oxide nanoparticles comprise silica nanoparticles.

15. The coating composition of claim 14 wherein the nanoparticles comprise a silane surface treatment comprising a water dispersible group.

16. The coating composition of claim 1 wherein the dried and cured coating composition does not exhibit fogging within 60 seconds after being soaked in 50° C. water for 24 hours.

17. The coating composition of claim 1 wherein the dried and cured coating composition does not exhibit fogging within 60 seconds after being soaked in 50° C. water for 24 hours or 65° C. water for 120 hours.

18. The coating composition of claim 1 wherein the cured coating has a light transmission of at least 90%.

19. An article comprising a substrate and the dried and cured coating of claim 1 .

20. The article of claim 19 wherein the substrate is light transmissive or opaque.

21. The article of claim 20 wherein the substrate is stainless steel, fiberboard, or polyvinylchloride.

22. A method of providing an anti-fog coating on a surface of a substrate, the method comprising
providing the coating composition according to claim 1 ;
applying the coating composition to a substrate; and
drying and curing the coating composition.

Assignees

• 3M Innovative Properties Co

Inventors

• Lu Yongshang
• Jing Naiyong
• Xie Dang
• Yu Zhigang
• Ylitalo Caroline M
• Ali Mahfuza B
• Kugel Alexander J
• Swanson Steven P

Classifications

• C03C17/322

  Polyurethanes or polyisocyanates · CPC title

• C03C2217/445

  Organic continuous phases · CPC title

• C09D133/00

  Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers · CPC title

• Y10T428/3158

  Halide monomer type [polyvinyl chloride, etc.] · CPC title

• Y10T428/3192

  Next to vinyl or vinylidene chloride polymer · CPC title