Photostencils for screenprinting.

摘要

Photodimerisable polymer compositions are based upon derivatives of polyvinylalcohol and constituents of the formula: <CHEM> wherein <CHEM> m = 0 or 1; n = 0 or an integer from 1-6; subject to the proviso that when n = 0, then m = 0; b = H or a tertiary amine, methoxy or ethoxy group; X = 0, S or Se or an NR1 or C(R1)2 group, wherein R1 = H or an alkyl, hydroxyalkyl, aryl or aralkyl group, Z = an anion and wherein R2 and R3 are the same or different and each represents H, halogen or an alkyl, hydroxyalkyl, aryl, nitro or cyano group or R2 and R3 taken together may form part of the same aromatic or aliphatic ring system. The preparation and typical uses of the polymer compositions as photostencils for screenprinting are also described.