Patent ID: 6201094
Filing Date: 2001-03-13
Classification: B32B,C08G,C08L,H05K

Abstract:
An epoxy resin having an epoxy equivalent weight of at least 140, said resin selected from the group consisting of: (a) a glycidylated polyphenol of a phenol and glyoxal wherein prior to glycidylation the polyphenol has not more than 6% of a TPE, a free phenol content of up to 5%, a weight average molecular weight of 400 to 600, a number average molecular weight of 300 to 390, an ultraviolet absorbance of at least 0.275 at 365 nm and/or at least 0.450 at 350 nm when the polyphenol is dissolved at a concentration of 10 milligrams per 100 milliliters of tetrahydrofuran; (b) a reaction product of about 4 to 8 parts of a polyepoxide to each part of a polyphenol of a phenol and glyoxal wherein the polyphenol has not more than 6% of a TPE, a free phenol content of up to 5%, a weight average molecular weight of 400 to 600, a number average molecular weight of 300 to 390, an ultraviolet absorbance of at least 0.275 at 365 nm and/or at least 0.450 at 350 nm when the polyphenol is dissolved at a concentration of 10 milligrams per 100 milliliters of tetrahydrofuran; and (c) mixtures thereof.