Amorphous perfluorinated polymers

Details Amorphous perfluorinated polymers Amorphous perfluorinated polymers

2006-08-15

2006-08-15

Pezzuto, Helen L. (Department: 1713)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S250000, C526S253000, C526S255000

Reexamination Certificate

active

07091295

ABSTRACT:
Use of amorphous perfluorinated polymers for preparing transparent films at 157 nm, said perfluorinated polymers being free from unstable ionic end groups COF, COOH or their amidic derivatives, esters or salts, said polymers formed by cyclic units deriving from perfluorodioxoles of formula:wherein R′Fis equal to RFor ORFwherein RFis a perfluoroalkyl radical having 1–5 carbon atoms; X1and X2, equal to or different from each other, are F, CF3;said polymers optionally containing units deriving from perfluorinated comonomers optionally containing oxygen atoms;in said polymers the cyclic units deriving from the perfluorodioxoles of formula (IA) being ≧95% by moles.

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Pianca, Maurizio, et al., “End groups in fluoropolymers”, Journal of Fluorine Chemistry 95, 1999, pp. 71-84.

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