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US 4,237,262 AGranted
Curable aliphatic epoxy-polimide compositions
AssigneeTRW Inc.
InventorRobert J. Jones
Life of this patent
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Abstract
A prepolymer is comprised of the reaction product of at least one aliphatic bismaleimide, at least one aromatic amine and at least one aromatic bismaleimide in combination with an aliphatic epoxy resin providing at least two functional epoxy groups to provide a low temperature curable composition. The cured products are flexible and strongly adherent to a variety of substrates.
Claims21
A low temperature curable composition comprising:
- (a) at least one curable polyimide prepolymer formed at a temperature sufficient to cause thermal reaction between heated components of a mixture of:
- (i) at least one aliphatic bismaleimide of the formula:
- ##STR19## wherein Z is a polyaliphatic ether in which each aliphatic group individually contains from one to about six carbon atoms, and in which each R is independently selected from the group consisting of hydrogen, an aliphatic group containing one or two carbon atoms, a benzenoid radical and a halogen;
- (ii) at least one aromatic polyamine;
- and
- (iii) at least one aromatic bismaleimide of the formula:
- ##STR20## wherein each R is independently selected from the group consisting of hydrogen, an aliphatic group containing one or two carbon atoms, a benzenoid radical and a halogen and wherein R' is a bifunctional benzenoid radical selected from the group consisting of:
- ##STR21## wherein X is selected from the group consisting of:
- --O--, --S--, --SO.sub.2 --, --CH.sub.2 --, --C.sub.2 H.sub.4 --, --CO--, --C.sub.3 H.sub.6 --, and ##STR22## (b) at least one epoxy resin of the formula:
- ##STR23## wherein X' is selected from the group consisting of:
- --O--, --S--, --CH.sub.2 -- and --CH.sub.2 CH.sub.2 --;
- R" is selected from the group consisting of:
- --H, and --CH.sub.3 ;
- and n is from 0 to about 20.
11 more elements
A low temperature curable composition comprising:
- (a) at least one curable polyimide prepolymer formed at a temperature sufficient to cause thermal reaction between heated components of a mixture of:
- (i) at least one aliphatic bismaleimide of the formula:
- ##STR31## where the sum of a and c is equal to about 3.5 and b is equal to about 13.5 to about 45.5;
- and
- (ii) an aromatic polyamine selected from the group consisting of methylene dianiline, an amine of the formula:
- ##STR32## wherein d has a value of from 0 to about 5 and mixtures thereof;
- (iii) an aromatic bismaleimide of the formula:
- ##STR33## (b) at least one epoxy resin of the formula:
- ##STR34## wherein X' is --O--, --S--, --CH.sub.2 --, --CH.sub.2 CH.sub.2 --;
- and wherein R" is selcted from the group consisting of:
- --H and --CH.sub.3 and wherein n is from about 0 to about 20.
8 more elements
A low temperature curable composition comprising:
- (a) at least one curable polyimide prepolymer formed at a temperature sufficient to cause thermal reaction between heated components of a mixture of:
- (i) at least one aliphatic bismaleimide of the formula:
- ##STR37## where the sum of a and c is equal to about 3.5 and b is equal to about 20.5;
- (ii) methylene dianaline;
- (iii) an aromatic bismaleimide of the formula:
- ##STR38## (b) at least one epoxy resin of the formula:
- ##STR39## wherein R" is selected from the group consisting of --H, and CH.sub.3 and in which n is from about 4.0 to about 8.0.
4 more elements
A low temperature curable composition comprising:
- (a) at least one curable polyimide prepolymer formed at a temperature sufficient to cause thermal reaction between heated components of a mixture of:
- (i) at least one aliphatic bismaleimide of the formula:
- ##STR40## where the sum of a and c is equal to about 3.5 and b is equal to about 20.5;
- and
- (ii) an aromatic polyamine of the formula:
- ##STR41## (iii) an aromatic bismaleimide of the formula:
- ##STR42## (b) at least one epoxy resin of the formula:
- ##STR43## wherein R" is selected from the group consisting of:
- --H, and --CH.sub.3 ;
- and wherein n is from about 4 to about 8.
7 more elements
Dependencies are inferred from the claim text.