Patent ID: 6232399
Filing Date: 2001-05-15
Classification: C08G,C08L,H05K

Abstract:
A flame retardant composition comprising an epoxy resin and based on each 100 parts of said epoxy resin:(a) about 18 to 25 parts of a phenol-formaldehyde novolac resin; and(b) about 3 to 10 parts of a member selected from the group consisting of: (i) a glycidylated phenol-glyoxal condensation product, said product prepared from the condensation of a phenol and glyoxal to produce a condensate having not more than 6% of tetraphenol ethanes and an ultraviolet absorbance of at least 0.275 at 365 nm as measured when 10 milligrams of the condensate is dissolved in 100 milliliters of tetrahydrofuran; (ii) a reaction product of about 4 to 8 parts of a glycidyl epoxy resin to each part of a phenol-glyoxal condensation product, said product prepared from the condensation of a phenol and glyoxal to produce a condensate having not more than 6% of tetraphenol ethanes and an ultraviolet absorbance of at least 0.275 at 365 nm as measured when 10 milligrams of the condensate is dissolved in 100 milliliters of tetrahydrofuran; (iii) a phenol-glyoxal condensation product said product prepared from the condensation of a phenol and glyoxal to produce a condensate having not more than 6% of tetraphenol ethanes and an ultraviolet absorbance of at least 0.275 at 365 nm as measured when 10 milligrams of the condensation product is dissolved in 100 milliliters of tetrahydrofuran; and mixtures thereof.