Abrasion resistant fluoropolymer compositions containing micropulp
View Patent ↗The present invention provides an abrasion resistant composition comprising fluoropolymer and an effective amount of micropulp to increase the abrasion resistance of an article such as a film formed from the composition by at least 25% as compared to film formed from the fluoropolymer by itself. In an especially preferred embodiment, the composition also contains an effective amount of pigment to further increase the abrasion resistance of film formed from the composition as compared to film formed from the fluoropolymer by itself. The invention is especially useful for films formed on a fuser roll.
1. A film comprising a composition of fluoropolymer and an effective amount of micropulp to increase the abrasion resistance of the surface of said film formed from said composition by at least 25% as compared to the surface of said film formed from the fluoropolymer by itself, wherein said micropulp comprises fibrils having cross-sections with a width dimension of less than 10 nanometers in diameter.
2. The film of claim 1 wherein the abrasion resistance of said surface of said film formed from a composition comprising fluoropolymer and an effective amount of micropulp is increased at least 50% as compared to the surface of said film formed from the fluoropolymer by itself.
3. The film of claim 1 wherein said micropulp is an aromatic polyamide.
4. The film of claim 3 wherein said aromatic polyamide is poly(p-phenylene terephthalamide) or poly(m-phenylene isophthalamide) or mixtures thereof.
5. The film of claim 1 wherein said fluoropolymer is melt processible or non-melt processible.
6. The film of claim 1 also containing an effective amount of electrically conductive particulate material.
7. The film of claim 6 wherein said electrically conductive particulate material is mica coated with electrically conductive material.
8. The film of claim 1 also containing an effective amount of pigment to further increase the abrasion resistance of film formed from said composition as compared to film formed from the fluoropolymer by itself.
9. The film of claim 8 wherein said pigment is a zeolite.
10. The film of claim 1 containing both electrically conductive particulate material and pigment.
11. The film of claim 10 wherein the total amount of said micropulp, electrically conductive particulate material, and pigment is at least 5 wt % based on the total weight of these ingredients plus the fluoropolymer, with the increase in abrasion resistance being at least 50% as compared to the fluoropolymer by itself, and with the release of said film being characterized by copier toner not sticking to said film when used as a film coating on a fuser roll.
12. The film of claim 1 wherein said micropulp is characterized by a volume average fiber length of 0.01 to 125 micrometers.
13. The film of claim 1 wherein said micropulp is characterized by a volume average fiber length of 5 to 30 micrometers.
14. The film of claim 1 wherein said film is on a fuser roll.