Epoxy imide

Claim 2

A composition comprising 50-70% by weight of a reaction product and about 30-50% by weight of a solvent selected from the group consisting of acetone, methylene dichloride, cyclohexanone, pentanedione, methyl-N-amyl ketone, methylisobutyl ketone, methylethyl ketone; and mixtures thereof; wherein the reaction product consists essentially of about (1) 10-96% by weight, based on the weight of the reaction product, of a blend of the following ##STR14## wherein n is a positive integer sufficient to provide a viscosity of 16,000-25,000 centipoises measured at 25° C. and having an epoxide equivalent of about 180-300 and (b) a brominated epoxy resin of the formula ##STR15## wherein n is a positive integer sufficiently large to provide a viscosity of 250-4,000 centipoises measured at 25° C., and the resin having an epoxide equivalent of about 300-800; (2) 2-60% by weight, based on the weight of the reaction product, of a bismaleimide of the formula ##STR16## wherein (1) and (2) are reacted for about 0.5-2 hours at about 115°-135° C. and subsequently reacting the product of (1) and (2) with (3) 2-30% by weight, based on the weight of the reaction product, of a diamine of the formula ##STR17## to form the reaction product; wherein the molar ratio of bismaleimide to diamine is about 0.6-0.8.

Claim 3

A process for forming the reaction product of claim 1 which comprises the following steps: (1) contacting the blend of epoxy resin and brominated epoxy resin with bismaleimide at about 115°-135° C. for about 0.5-2.0 hours to form a product and (2) adding the diamine to the product of Step 1.

Claim 4

A composition comprising 50-70% by weight of a reaction product and 30-50% by weight of a solvent selected from the group consisting of acetone, methylene dichloride, cyclohexanone, pentanedione, methyl-N-amyl ketone, methyl isobutyl ketone, methylethyl ketone mixtures thereof; wherein the reaction product consists essentially of about (1) 10-96% by weight, based on the weight of the reaction product, of a blend of the following (a) an epoxy novolac resin of the formula ##STR18## where n is a positive integer and the resin has an epoxide equivalent of about 170-180 and a viscosity of about 1400-2000 centipoises measured at 25° C. and (b) a brominated epoxy resin of the formula ##STR19## wherein n is a positive integer sufficiently large to provide a viscosity of 250-4,000 centipoises measured at 25° C., and the resin having an epoxide equivalent of about 300-800; - 60% by weight, based on the weight of the reaction product, of a bismaleimide of the formula ##STR20## and wherein (1) and (2) are reacted at about 115°-135° C. for about 0.5-2.0 hours and subsequently reacting the product of (1) and (2) with (3) 2-30% by weight, based on the weight of the reaction product, of a diamine of the formula ##STR21## to form the reaction product; wherein the molar ratio of bismaleimide to diamine is about 0.6-0.8.

Claim 5

A composition comprising 50-70% by weight of a reaction product and 30-50% by weight of a solvent selected from the group consisting of acetone, methylene dichloride, cyclohexanone, pentanedione, methyl-N-amyl ketone, methyl isobutyl ketone, methylethyl ketone mixtures thereof; wherein the reaction product consists essentially of about (1) 10-96% by weight, based on the weight of the reaction product, of a blend of the following (a) an epoxy novolac resin of the formula ##STR18## where n is a positive integer and the resin has an epoxide equivalent of about 170-180 and a viscosity of about 1400-2000 centipoises measured at 25° C. and (b) a brominated epoxy resin of the formula ##STR19## wherein n is a positive integer sufficiently large to provide a viscosity of 250-4,000 centipoises measured at 25° C., and the resin having an epoxide equivalent of about 300-800; - 60% by weight, based on the weight of the reaction product, of a bismaleimide of the formula ##STR20## and wherein (1) and (2) are reacted at about 115°-135° C. for about 0.5-2.0 hours and subsequently reacting the product of (1) and (2) with (3) 2-30% by weight, based on the weight of the reaction product, of a diamine of the formula ##STR21## to form the reaction product; wherein the molar ratio of bismaleimide to diamine is about 0.6-0.8.

Claim 6

A process for forming the reaction product of claim 3 which comprises the following steps (1) contacting epoxy novolac resin and brominated epoxy resin with bismaleimide at about 115°-135° C. for about 0.5-2 hours to form a product and (2) adding the daimine to the product of Step (1).