Claims
- 1. 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.degree. 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.degree. 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.degree.-135.degree. 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.
- 2. 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.degree.-135.degree. C. for about 0.5-2.0 hours to form a product and
- (2) adding the diamine to the product of Step 1.
- 3. 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.degree. 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.degree. 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.degree.-135.degree. 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.
- 4. 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.degree.-135.degree. C. for about 0.5-2 hours to form a product and
- (2) adding the daimine to the product of Step (1).
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a divisional application of Ser. No. 27,444 filed Apr. 5, 1979 which is a continuation-in-part of Ser. No. 848,638 filed Nov. 4, 1977, now abandoned.
US Referenced Citations (14)
Foreign Referenced Citations (3)
Number |
Date |
Country |
48-75234 |
Nov 1973 |
JPX |
50-78697 |
Jun 1975 |
JPX |
1175488 |
Dec 1969 |
GBX |
Divisions (1)
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Number |
Date |
Country |
Parent |
27444 |
Apr 1979 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
848638 |
Nov 1977 |
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