Patent Number: 6,166,245

Title: Photoimageable compositions having improved chemical resistance and stripping ability

Abstract: A negative-acting photoimageable composition useful as a primary imaging resist in the manufacture of printed circuit boards comprises an acid-functional binder polymer, a photopolymerizable component, and a photoinitiator chemical system, in which the binder polymer has an anhydride functional backbone half-esterified with a meth(acrylate) functional hydroxy-terminated oligomer, wherein the meth(acrylate) functionality is separated from the half-ester linkage by at least two alkoxylate groups and at least one ring opened lactone group for improved stripping ability in strong alkaline aqueous stripping solutions, while maintaining good chemical resistance to other processing chemicals, such as alkaline developing solutions, acid etching solutions, and acid plating baths.

Inventors: Lundy; Daniel E. (Pomona, CA), Barr; Robert K. (Laguna Niguel, CA), Reardon; Edward J. (Laguna Niguel, CA)

Assignee: Shipley Company, L.L.C.

International Classification: C08F 8/14 (20060101); C08F 8/00 (20060101); C08F 257/00 (20060101); C08F 290/00 (20060101); C08F 267/00 (20060101); C08F 267/04 (20060101); C08L 51/00 (20060101); C08F 290/06 (20060101); C08F 257/02 (20060101); G03F 7/033 (20060101); G03F 7/038 (20060101); C07C 067/26 (); C07C 069/54 (); C08F 267/04 ()

Expiration Date: 12/26/2017