Non-stick finish composition

Abstract

A composition is provided that is applicable for providing a non-stick abrasion-resistant coating on a surface, but not as a primer layer, said composition comprising fluoropolymer and an effective amount of ceramic particles having an average size of at least about 10 micrometers to improve the abrasion resistance of said coating on said surface by at least 10% as determined by the dry SBAR method, said composition optionally containing adhesion promoter in an amount up to about 10 wt % of the wt. of said fluoropolymer.

Description

Claims

1. Composition applicable for providing a non-stick abrasion-resistant coating on a surface, said composition comprising fluoropolymer and an effective amount of ceramic particles having an average size of at least about 10 micrometers to improve the abrasion resistance of said coating on said surface by at least 10% as determined by the dry SBAR method, said composition optionally containing adhesion promoter in an amount up to about 10 wt % of the wt. of said fluoropolymer.

2. The composition of claim 1 contained as a dispersion in a liquid medium.

3. The composition of claim 2 wherein said liquid medium comprises water, whereby said dispersion is an aqueous dispersion.

4. The composition of claim 1 wherein said amount of ceramic particles improves the abrasion resistance of said coating by at least 50%.

5. The composition of claim 1 wherein the amount of said fluoropolymer is effective to provide a continuous film within which said ceramic particles are dispersed upon applying said composition to said surface to form said coating, said ceramic particles present in said composition constituting at least about 3 wt % up to the combined weight of said fluoropolymer and said ceramic particles.

6. The composition of claim 1 wherein the amount of said ceramic particles is from about 3 to about 40 wt % and the amount of said fluoropolymer is about 60-96 wt % based on the combined weight of said ceramic particles and said fluoropolymer.

7. The composition of claim 1 wherein the average size of said ceramic particles is about 14-36 micrometers.

8. The composition of claim 1 wherein the average size of said ceramic particles is about 20-30 micrometers.

9. The composition of claim 1 additionally containing pigment.

10. The composition of claim 1 additionally containing particles of inorganic film hardener having an average particle size of less than about 3 micrometers.

11. The composition of claim 1 wherein said ceramic particles have a Knoop hardness of at least 1200.

12. The composition of claim 1 wherein said ceramic particles are SiC.

13. The composition of claim 1 wherein said adhesion promoter is at least one polymer selected from the group consisting of polyamideimide, polyether sulfone, and polyphenylene sulfide.

14. The composition of claim 13 wherein said adhesion promoter is present in an amount up to about 8 wt % of the weight of said fluoropolymer.

15. The composition of claim 1 wherein said adhesion promoter is present in an amount up to about 5 wt % of the weight of said fluoropolymer.

16. The composition of claim 1 substantially free of said adhesion promoter.

17. Process comprising applying the composition of claim 2 to a surface and drying and baking said composition to form a coating having a thickness of about 0.5 to 1 mils (12.7 to 25.4 micrometers).

18. Process of claim 17 wherein said surface is a primer layer on a substrate.

19. Process of claim 17 wherein said coating has a thickness of 0.6 to 0.9 mils (15 to 23 micrometers).

20. Process comprising applying the composition of claim 2 to a surface and drying and baking said composition to form a coating which is greater than the minor dimension of said ceramic particles.

21. The process of claim 20 wherein the thickness of said layer is less than the major dimension of said ceramic particles.