Patent ID: 9650538
Date: 2017-05-16
CPC Classifications: B81C,C09D,G03F

Claim:
1. An optically patternable sacrificial film-forming composition for use in surface micro-machining process, comprising (A-1) (i) a cresol novolac resin consisting of at least 40 mol % of p-cresol and the remainder of m-cresol and having a weight average molecular weight of 2,000 to 30,000 and a melting temperature of at least 130° C. in which some or all phenolic hydroxyl groups are esterified with 1,2-naphthoquinonediazidosulfonyl halide, or (ii) a mixture of the cresol novolac resin consisting of at least 40 mol % of p-cresol and the remainder of m-cresol and having a weight average molecular weight of 2,000 to 30,000 and having some or all phenolic hydroxyl groups esterified with 1,2-naphthoquinonediazidosulfonyl halide and a cresol novolac resin consisting of at least 40 mol % of p-cresol and the remainder of m-cresol and having a weight average molecular weight of 2,000 to 30,000 and a melting temperature of at least 130° C. in which phenolic hydroxyl groups are not esterified, or (A-2) the novolac resin (i) or the novolac resin mixture (ii) of (A-1) and a 1,2-naphthoquinonediazidosulfonic acid ester, and a crosslinker capable of foiiiiing crosslinks within the cresol novolac resin in the presence of an acid catalyst.