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AssigneeMacDermid, Incorporated
InventorsSteven A. Castaldi, Peter D. Gabriele, Victor Saverino
Estimating the term…
A photosensitive composition for providing a solder mask on a printed circuit board is described, comprised of (a) an esterified styrene-maleic anhydride copolymer having less than 15%, most preferably less than 5%, free anhydride, with at least about 50% of the available anhydride groups being esterified with a hydroxyalkyl (meth)acrylate and at least about 0.1% of the available anhydride groups being esterified with a monohydric alcohol; (b) a multifunctional (meth)acrylate monomer; and (c) a multifunctional epoxide. The composition is coated on a printed circuit board, imagewise exposed to radiation to effect sufficient curing of the composition at exposed areas to enable removal of unexposed areas with developer, and post-baked after development to produce a desired patterned distribution of the cured composition to serve as a solder mask.
A radiation-curable composition comprising (a) an esterified styrene-maleic anhydride copolymer having less than 15% free anhydride, and in which at least about 50% of the available anhydride groups are esterified with a hydroxyalkyl (meth)acrylate and at least about 0.1% of the available anhydride groups are esterified with a monohydric alcohol;
A method for providing a printed circuit board with a desired patterened distribution of solder mask, comprising the steps of:
Dependencies are inferred from the claim text.