Patent ID: 6258506
Filing Date: 2001-07-10
Classification: C08K,G03F

Abstract:
A method for forming a pattern of cured material comprising(a) forming a thin film of an ultraviolet-curable composition on a substrate wherein the composition comprises(i) 0.001 to 10 wt % based on the total weight of the composition of a benzoin ether selected from the group consisting of PhC(.dbd.O)C(OR).sub.2 Ph and PhC(.dbd.O)CH(OR)Ph wherein Ph denotes phenyl and R is selected from the group consisting of methyl, ethyl, and propyl; and(ii) a free-radical polymerizable functional silicone polymer of the general formula(R.sub.3 SiO.sub.1/2).sub.a (R'.sub.2 SiO.sub.2/2).sub.b (R""SiO.sub.3/2).sub.c (SiO.sub.4/2).sub.dwherein R, R', and R"" are independently selected from the group consisting of hydrogen, C.sub.1 to C.sub.10 saturated hydrocarbyl and C.sub.1 to C.sub.10 unsaturated hydrocarbyl, wherein the hydrocarbyl may contain one or more atoms selected from fluorine, oxygen, chlorine, and nitrogen; with the proviso that at least 10% of the total R, R', and R"" is selected from the group consisting of vinylphenyl, vinylbenzyl, and vinylphenethyl;0.8.gtoreq.a.gtoreq.0; 0.5.gtoreq.b.gtoreq.0; 1.0.gtoreq.c.gtoreq.0; 0.65.gtoreq.d.gtoreq.0; the sum of a, b, c, and d=1 andwherein at least one of the silicon-bonded divalent oxygen atoms in each R'.sub.2 SiO.sub.2/2, each R""SiO.sub.3/2, and each SiO.sub.4/2 is bonded to another silicon to form a siloxane bond while the remaining oxygen in each case can be bonded to another silicon to form a siloxane bond, or can be bonded to methyl or ethyl to form an alkoxy group, or can be bonded to hydrogen to form silanol;(b) placing a masking pattern between an ultraviolet source and the film;(c) exposing the film at from 0.degree. C. to 100.degree. C. through the masking pattern to light containing UV radiation at a wavelength from 200 to 400 nm;(d) thereafter heating the film at from 20.degree. C. to 180.degree. C.;(e) washing with inorganic or organic solvent in order to dissolve out and remove any uncured composition; and(f) additionally heating at from 50.degree. C. to 400.degree. C. to produce a cured compsition.