Patent ID: 7198884
Filing Date: 2007-04-03
Classification: G03F,Y10S

Abstract:
1. A process for preparing a dry film resist, which process comprises forming a photocurable resin composition onto a support film with a thickness of 1 to 50 μm and optionally laminate a protective film onto the photocurable composition layer to obtain a dry film resist; whereby the photocurable resin is formed from a homogeneous mixture comprising (a) from 20–90 wt % of an alkaline soluble acrylic polymer having carboxylic acid function as a pendant group and having a molecular weight of about 2,000 to 2,000,000, and an acid value from 50 to 600 mg KOH/g; (b) from 5 to 60 wt % of one or more photopolymerizable monomers which are compatible with the oligomers and polymers of component (a); (c) from 0.01 to 20% by weight of one or more photoinitiators; (d) from 0 to 20% by weight of additives and/or assistants; and (e) from 0.1 to 10% by weight of a leuco triphenylmethane dye of the formula I wherein R R R R X is O, S, NH or N—C where the total of (a) through (e) equals 100% by weight.