Modified bisimide compositions
AssigneeShell Oil Company
InventorLarry S. Corley
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Abstract
A modified bisimide resin is prepared by copolymerizing a bisimide monomer and a cyclic triene. The copolymerization of a bisimide with a cyclic triene such as 1,2,4-trimethylenecyclohexane provides a modified bisimide having good fracture toughness.
Claims9
A bismide copolymer prepared by heating a composition comprising
- (a) a bisimide of an unsaturated dicarboxylic acid as represented by the formula ##STR13## in which Y is a substituted or unsubstituted divalent moiety containing at least 2 carbon atoms and a carbon-carbon double bond, and Z is a divalent linking group;
- (b) a cyclic triene according to one of the formulas I and II:
- ##STR14## in which each R is selected independently from hydrogen and C.sub.1-3 alkyl, R' is a divalent linking group, each of m and n is an integer within the range of 0 and 6, and m+n is at least 2,
- at a temperature of at least about 150.degree. C. for at least about 2 hours.
A method for increasing the fracture toughness of a cured bisimide of an unsaturated dicarboxylic acid which can be represented by the formula ##STR15## in which Y is a substituted or unsaturated divalent group containing at least 2 carbon atoms and carbon-carbon double bond, and Z is a divalent linking group, the method comprising
- (a) blending with the bisimide, in uncured form, from about 0.2 to about 1.0 mole, per mole of the bisimide, of a C.sub.6-20 cyclic triene characterized by (1) a conjugated diene moiety having exocyclic double bonds attached to a single aliphatic ring and (2) and isolated double bond, and
- (b) heating the resulting blend to a temperature within the range of about 170.degree. to about 350.degree. C. for a time of at least about 2 hours.
Dependencies are inferred from the claim text.