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US 4,283,521 AGranted
Curable aromatic epoxy-polyimide and cycloaliphatic epoxy-polyimide 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 aromatic and/or a cycloaliphatic epoxy resin providing at least two functional epoxy groups to provide a low temperature curable composition. The cured products are strongly adherent to a variety of substrates.
Claims35
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:
- ##STR26## 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:
- ##STR27## 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:
- ##STR28## 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 ##STR29## and;
- (b) at least one aromatic epoxy resin of the formula:
- ##STR30## wherein n has an average value of from 0 to about 6;
- each X' is independently selected from the group consisting of:
- ##STR31## and each R" is independently selected from the group consisting of --H, and ##STR32##
10 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:
- ##STR43## 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:
- ##STR44## wherein d has a value of from 0 to about 5 and mixtures thereof. (iii) an aromatic bismaleimide of the formula:
- ##STR45## (b) at least one aromatic epoxy resin of the formula:
- ##STR46## wherein n has an average value of from 0 to about 6;
- each X' is independently selected from the group consisting of:
- ##STR47## and each R" is independently selected from the group consisting of --H, and ##STR48##
7 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:
- ##STR60## 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:
- ##STR61## (b) at least one aromatic epoxy resin of the formula:
- ##STR62## wherein n has an average value of from 0 to about 6;
- each X' is independently selected from the group consisting of:
- ##STR63## and each R" is independently selected from the group consisting of --H, and ##STR64##
6 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:
- ##STR68## 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:
- ##STR69## (iii) an aromatic bismaleimide of the formula:
- ##STR70## (b) at least one aromatic epoxy resin of the formula:
- ##STR71## wherein n has an average value of from 0 to about 6;
- each X' is independently selected from the group consisting of:
- ##STR72## and each R" is independently selected from the group consisting of --H, and ##STR73##
7 more elements
Dependencies are inferred from the claim text.