Patent ID: 8829087

Claim:
A layer forming polymer consisting essentially of a first type of norbornene-type repeating unit and a second type of norbornene-type repeating unit each represented by Formula A, such types of repeating units derived from norbornene-type monomers represented by Formula A1: where m is 0, 1 or 2, at least one of R a , R b , R c , and R d for said first type of repeating unit is a crosslinkable hydrocarbyl pendent group selected from the group consisting, of Formulae B and C: where n is an integer from 1 to 4, A is an optional linking group selected from the group consisting of methylene and a C 2 to C 6 alkylene, R 1 and R 2 are each independently selected from the group consisting of hydrogen, methyl and ethyl; and at least one of R a , R b , R c and R d for said second type of repeating unit is distinct from said first type of repeating unit and is a hydrocarbyl pendent group, where said hydrocarbyl pendent group is selected from the group consisting of Formulae E, F, G and H: where A † , if present, is a linking group selected from the group consisting of methylene, a C 2 to C 3 alkylene and a C 2 to C 6 ether, for Formula E, R*, R 1 and R 2 are each fluorine and for Formulae F, G and H each R* is hydrogen or fluorine, R 1 and R 2 are each independently selected from the group consisting of hydrogen, fluorine, methyl, perfluoromethyl, ethyl and perfluoroethyl, n is an integer from 1 to 6 and n* is an integer from 0 to 3, Z is selected, from the group consisting of (C n R* 2n+1 ), and (CR* 2 ) n (CR 1 R 2 ) n OH, Q, if present, is selected from a C 2 to C 9 alkylene; and the remaining R a , R b , R c and R d are independently selected from the group consisting of hydrogen and C 1 -C 6 alkyl; and wherein said polymer having at least 95% transmission of its initial transparency at 400 nm after exposure of a 3 μm film of said polymer to thermal treatment in air at 280° C. for 30 minutes.