Epoxy imide compositions

Claim 2

A product comprising a fibrous substrate impregnated with a composition comprising 20-80% by weight of a reaction product and 20-80% of a nonamide solvent for the reaction product having a dispersion solubility parameter of 7.2-10.5, a polar solubility parameter of 3-9.5 and a hydrogen bonding solubility parameter of 0-5.5; wherein the reaction product consists essentially of (a) an epoxy resin of the formula ##STR14## wherein R is an alkylene group of 1-4 carbon atoms, n is a positive integer; and the resin having an epoxide equivalent of about 150-1000; and (b) a bismaleimide of the formula ##STR15## wherein (a) and (b) are reacted at 115°-135° C. for about 0.5-2 hours and subsequently contacting the product of (a) and (b) with (c) a diamine of the formula ##STR16## reaction product; wherein the molar ratio of bismaleimide to diamine is about 0.6-0.8.

Claim 3

The product of claim 1 in which R 1 is an alkylene group having 1-6 carbon atoms, phenylene, cyclohexylene, ##STR17## where R 2 is an alkylene group having 1-4 carbon atoms, SO 2 or O.

Claim 4

The product of claim 2 in which R is ##STR18##

Claim 5

The product of claim 3 in which R 1 is an aromatic group.

Claim 6

The product of claim 4 in which R 1 is ##STR19##

Claim 7

The product of claim 4 in which R 1 is ##STR20##

Claim 8

A product comprising a fibrous substrate impregnated with a composition comprising 50-70% by weight of a solvent selected from the group consisting of acetone, methylene dichloride, cyclohexanone, pentanedione, methyl-N-amyl keton, methylisobutyl ketone, methylethyl ketone; and mixtures thereof; wherein the reaction product consists essentially of (a) an epoxy resin of the formula ##STR21## 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; (b) a brominated epoxy resin of the formula ##STR22## 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; (c) a bismaleimide of the formula ##STR23## wherein (a), (b) and (c) are reacted for about 0.75-1.25 hours at about 115°-125° C. and subsequently the product of (a), (b) and (c) with (d) a diamine of the formula ##STR24## reaction product; wherein the molar ratio of bismaleimide to diamine is about 6.0-0.8.

Claim 9

A product comprising a fibrous substrate impregnated with a composition comprising 50-70% by weight of a solvent selected from the group consisting of acetone, methylene dichloride, cyclohexanone, pentanedione, methyl-N-amyl keton, methylisobutyl ketone, methylethyl ketone; and mixtures thereof; wherein the reaction product consists essentially of (a) an epoxy resin of the formula ##STR21## 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; (b) a brominated epoxy resin of the formula ##STR22## 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; (c) a bismaleimide of the formula ##STR23## wherein (a), (b) and (c) are reacted for about 0.75-1.25 hours at about 115°-125° C. and subsequently the product of (a), (b) and (c) with (d) a diamine of the formula ##STR24## reaction product; wherein the molar ratio of bismaleimide to diamine is about 6.0-0.8.

Claim 10

The product of claim 7 in which the fibrous substrate is selected from the group consisting of fiberglass, a high temperature resistant polyamide fiber or a graphite fiber.

Claim 11

The product of claim 8 in which the substrate is of fiberglass and has a copper electrical circuit firmly adhered thereto.

Claim 12

A product comprising a fibrous substrate impregnated with a composition comprising 20-80% by weight of a reaction product and 20-80% of a nonamide solvent for the reaction product having a dispersion solubility parameter of 7.2-10, a polar solubility parameter of 3-9.5 and a hydrogen bonding solubility parameter of 0-5.5; wherein the reaction product consists essentially of (a) an epoxy novolac resin of the formula ##STR25## wheren n is a positive integer and the resin has an epoxide equivalent of about 150-300. (b) a bismaleimide of the formula ##STR26## wherein (a) and (b) are reacted at about 115°-135° C. for about 0.5-2 hours and subsequently reacting the product of (a) and (b) with (c) a diamine of the formula ##STR27## to form the reaction product; wherein the molar ratio of bismaleimide to diamine is about 0.6-0.8.

Claim 13

A product comprising a fibrous substrate impregnated with a composition comprising 20-80% by weight of a reaction product and 20-80% of a nonamide solvent for the reaction product having a dispersion solubility parameter of 7.2-10, a polar solubility parameter of 3-9.5 and a hydrogen bonding solubility parameter of 0-5.5; wherein the reaction product consists essentially of (a) an epoxy novolac resin of the formula ##STR25## wheren n is a positive integer and the resin has an epoxide equivalent of about 150-300. (b) a bismaleimide of the formula ##STR26## wherein (a) and (b) are reacted at about 115°-135° C. for about 0.5-2 hours and subsequently reacting the product of (a) and (b) with (c) a diamine of the formula ##STR27## to form the reaction product; wherein the molar ratio of bismaleimide to diamine is about 0.6-0.8.

Claim 14

The product of claim 10 in which R 1 is an alkylene group having 1-6 carbon atoms, phenylene, cyclohexylene, ##STR28## where R 2 is an alkylene groups having 1-4 carbon atoms, SO 2 or O.

Claim 15

The product of claim 11 in which R 1 is an aromatic group.

Claim 16

The product of claim 12 in which R 1 is ##STR29##

Claim 17

The product of claim 12 in which R 1 is ##STR30##

Claim 18

A product comprising a fibrous substrate impregnated with 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 and mixtures thereof; where in the reaction product consists essentially of (a) an epoxy novolac resin of the formula ##STR31## 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.; (b) a brominated epoxy resin of the formula ##STR32## 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; (c) a bismaleimide of the formula ##STR33## wherein (a), (b) and (c) are reacted at about 115°-135° C. for about 0.5-2.0 and subsequently reacting the product of (a), (b) and (c) with (d) a diamine of the formula ##STR34## to form the reaction product; wherein the molar ratio of bismaleimide to diamine is about 0.6-0.8.

Claim 19

A product comprising a fibrous substrate impregnated with 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 and mixtures thereof; where in the reaction product consists essentially of (a) an epoxy novolac resin of the formula ##STR31## 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.; (b) a brominated epoxy resin of the formula ##STR32## 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; (c) a bismaleimide of the formula ##STR33## wherein (a), (b) and (c) are reacted at about 115°-135° C. for about 0.5-2.0 and subsequently reacting the product of (a), (b) and (c) with (d) a diamine of the formula ##STR34## to form the reaction product; wherein the molar ratio of bismaleimide to diamine is about 0.6-0.8.

Claim 20

The product of claim 15 in which the fibrous substrate is selected from the group consisting of fiberglass, a high temperature polyamide or graphite fiber.

Claim 21

The product of claim 16 in which the substrate is fiberglass.

Claim 22

The product of claim 17 having a copper electrical circuit firmly adhered thereto.