Patent ID: 8895691

Claim:
A polymer comprising a first component and a second component, said first component being photolytically stable and acid-stable, wherein said first component is —CO-G 5 -CO—, wherein G 5 is selected from an alkane, a fluoroalkane, an arene, a fluoroarene, a diaryl ether and a diaryl; and said second component consisting of a unit chosen from units of the formulae wherein R 3 and R 4 are independently chosen from (C 1 -C 6 )alkyl, or R 3 and R 4 together with the carbon to which they are attached form a cyclopentane or cyclohexane ring; G 1 is selected from (C 1 -C 20 )hydrocarbon and fluoro(C 1 -C 20 )hydrocarbon; G 2 is an unsaturated (C 2 -C 10 )hydrocarbon; and A 1 and A 2 are independently chosen from (C 1 -C 20 )hydrocarbon, fluoro(C 1 -C 20 )hydrocarbon, (C 1 -C 20 )hydrocarbon ether, (C 1 -C 6 )oxaalkyl, (C 1 -C 6 )thiaalkyl, (C 1 -C 6 )azaalkyl and acylated(C 1 -C 6 )azaalkyl, each of the foregoing terminating in —O—, —S— or —NR 9 —, wherein R 9 is H, (C 1 -C 6 )alkyl or benzyl.