Protective coatings for microporous sheets

• US 20040191420A1
• Filed: 03/24/2003
• Published: 09/30/2004
• Est. Priority Date: 03/24/2003
• Status: Abandoned Application

• Current Assignee: PPG Industries Ohio Incorporated (Nouryon BV)
• Original Assignee: PPG Industries Ohio Incorporated (Nouryon BV)
• Inventors: Rearick, Brian K., Perrine, M. Lisa
• Application Number:
  US10/395,567
• Publication Number:
  US 20040191420A1
• Time in Patent Office: Days
• US Class Current: 427/384
• CPC Class Codes: C08K 5/005 Stabilisers against oxidation, heat, light, ozone
• CPC Class Codes: C09D 175/16 having terminal carbon-to-carbon unsaturated bonds
• CPC Class Codes: C09D 4/06 Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09D159/00 - C09D187/00
• CPC Class Codes: Y10T 428/249953 Composite having voids in a component [e.g., porous, cellular, etc.]

Abstract

Microporous sheets coated with protective coatings are disclosed. The protective coatings comprise a UV absorber, and may also comprise a light stabilizer. The coated microporous sheets exhibit favorable physical properties including high QUV resistance and exterior durability. The coated microporous sheets may be used for applications such as advertising displays, banners, printed materials and sports equipment.

Claims

1. A microporous sheet coated with a protective coating comprising a UV absorber and a binder, wherein the binder comprises a polyurethane acrylic, polyurea, polysiloxane, polyester, polyether, polycarbonate, polyamide, epoxy vinyl and/or thiolene.

2. The microporous sheet of claim 1, wherein the UV absorber comprises a benzotriazole, triazine, oxanilide and/or benzophenone.

3. The microporous sheet of claim 1, wherein the UV absorber comprises benzotriazole.

4. The microporous sheet of claim 1, wherein the UV absorber comprises 2-(2′

-hydroxy-5′

-methylphenyl)-benzotriazole, 2-(3′

,5′

-di-tert-butyl-2′

-hydroxyphenyl)-5-chlorobenzotriazole, 2(2′

-hydroxy-3′

,5′

-di-tert-amylphenyl)benzotriazole, benzenepropanoic acid, 3-(2H-benzotriazol-2-yl)-5-(1,1-dimethylethyl)-4-hydroxy-,C7-9-branched alkyl esters, 2-(3′

,5′

-bis(1-methyl-1-phenylethyl)-2′

-hydroxyphenyl)benzotriazole, 2-(2-hydroxy-3-dimethylbenzylphenyl-5-(1,1,3,3-tetramethylbutyl))-2H-benzotriazole, iso-octyl-3-(3-(2H-benzotriazol-2-yl)-5-tert-butyl-)4-hydroxyphenyl-proprionate, and/or poly(oxy-1,2-ethanediyl), α

-(3-(3-(2H-benzotriazol-2-yl)-5-(1,1-dimethylethyl)-4-hydroxyphenyl)- 1-oxopropyl)-ω

-hydroxy poly(oxy-1,2-ethanedlyl), α

-(3-(3-(2H-benzotriazol-2-yl)-5-(1,1-dimethylethyl)-4-hydroxyphenyl)-1-oxopropyl)-ω

-(3-(3-(2H-benzotriazol-2-yl)-5-(1,1-dimethylethyl)-4-hydroxyphenyl)-1-oxopropyl).

5. The microporous sheet of claim 1, wherein the UV absorber comprises triazine.

6. The microporous sheet of claim 1, wherein the protective coating comprises 2-(4-(2-hydroxy-3-tridecyl oxypropyl)oxy)-2-hydroxyphenyl)-4,6-bis (2,4,dimethylphenyl)-1,3,5-triazine, 2-(4-(2-hydroxy-3-dodecyl oxypropyl)oxy)-2-hydroxyphenyl)-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine, and/or 2-(4-(2-hydroxy-3-(2′

-ethyl)hexyl)oxy)-2-hydroxyphenyl)-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine.

7. The microporous sheet of claim 1, wherein the UV absorber comprises from about 0.05 to about 20 weight percent of the protective coating.

8. The microporous sheet of claim 1, wherein the UV absorber comprises from about 0.5 to about 2 weight percent of the protective coating.

11. The microporous sheet of claim 1, wherein the protective coating further comprises a light stabilizer.

12. The microporous sheet of claim 11, wherein the light stabilizer comprises a hindered amine.

13. The microporous sheet of claim 11, wherein the light stabilizer comprises decanedioic acid, bis(2,2,6,6-tetramethyl-4-piperidinyl)ester, reaction products with 1,1-dimethylethyl-hydroperoxide and octane, bis(1,2,2,6,6-pentamethyl-4-piperidinyl)(3,5-di-tert-butyl-4-hydroxybenxyl)butylpropanedioate, bis(1,2,2,6,6 pentamethyl-4-piperidinyl)sebacate methyl 1,2,2,6,6-pentamethyl-4-piperidinyl sebacate, and/or blends of butanedioic acid polymer with (4-hydroxy-2,2,6,6-tetramethylpiperidin-1-yl) ethanol and N,N′

,N″

,N′

″

-tetrakis(4,6-bis(butyl-(N-methyl-2,2,6,6-tetramethylpiperidine-4-yl)amino)triazine-2-yl-4,7-diazadecane-1,10-diamine.

14. The microporous sheet of claim 11, wherein the light stabilizer comprises from about 0.05 to about 10 weight percent of the protective coating.

15. The microporous sheet of claim 1, wherein the protective coating further comprises an antioxidant.

16. The microporous sheet of claim 1, wherein the protective coating further comprises a pigment.

17. The microporous sheet of claim 1, wherein the microporous sheet comprises a synthetic polymer matrix.

18. The microporous sheet of claim 17, wherein the microporous sheet further comprises at least about 30 weight percent filler particles.

19. The microporous sheet of claim 18, wherein the filler particles comprise at least 50 weight percent of the microporous sheet.

20. The microporous sheet of claim 1, wherein the microporous sheet comprises a polyethylene matrix.

21. The microporous sheet of claim 1, wherein the microporous sheet comprises silica filler particles.

22. The microporous sheet of claim 1, wherein the microporous sheet comprises from about 30 to about 95 volume percent pores.

23. The microporous sheet of claim 1, wherein the protective coating has a dry film thickness of from about 5 to about 100 microns.

24. The microporous sheet of claim 1, wherein the coated microporous sheet has a QUV resistance of at least 500 hours.

25. The microporous sheet of claim 1, wherein the coated microporous sheet has a QUV resistance of at least 750 hours.

26. The microporous sheet of claim 1, wherein the coated microporous sheet has a QUV resistance of greater than 1,000 hours.

27. The microporous sheet of claim 26, wherein the microporous sheet comprises a synthetic polymer matrix and filler particles.

9. The microporous sheet of claim 9, wherein the binder comprises a polyurethane.

10. The microporous sheet of claim 9, wherein the protective coating further comprises a crosslinker.

28. A method of coating a microporous sheet, the method comprising applying a flowable UV absorbing protective coating on the microporous sheet, wherein the coating comprises a polyurethane acrylic, polyurea, polysiloxane, polyester, polyether, polycarbonate, polyamide, epoxy vinyl and/or thiolene.

29. The method of claim 28, wherein the protective coating is applied by spraying, rolling, dipping or brushing.

30. The method of claim 28, wherein the protective coating is applied at a dry film thickness of from about 5 to about 100 microns.

31. The method of claim 28, further comprising curing the protective coating after it is applied on the microporous sheet.

32. The method of claim 31, wherein the protective coating is UV cured.

33. The method of claim 31, wherein the protective coating is cured by heating.

34. The method of claim 28, wherein the UV absorber comprises a benzotriazole, triazine, oxanilide and/or benzophenone.

35. The method of claim 28, wherein the protective coating further comprises a binder.

36. The method of claim 28, wherein the protective coating further comprises a light stabilizer.

37. The method of claim 28, wherein the protective coating further comprises a pigment.

38. The method of claim 28, wherein the microporous sheet comprises a synthetic polymer matrix and filler particles.