The Secretary of State for Defense in Her Britannic Majesty's Government

The Secretary of State for Defence in Her Majesty's Government of the

Secretary of State for Defence in Her Majesty's Government of United

Stephen J Shaw

Anthony J Kinloch

Curable thermosetting prepolymerized imide resin compositions are prepared by chemically reacting, at a temperature below 150.degree. C., a liquid mixture of carboxy-terminated polybutadiene/acrylonitrile (CTBN) and a co-reactant comprising at least one N,N'-bisimide of an unsaturated carboxylic acid of formula (I) where B represents a divalent radical containing a carbon-carbon double bond and A represents a divalent radical having at least two carbon atoms to yield a curable thermosetting prepolymerized imide resin composition containing copolymerized CTBN and co-reactant. A resin composition prepared by this method may be cured at a temperature between 100.degree. C. and 350.degree. C. to yield a fully cross-linked polyimide matrix containing a dispersion of phase-separated solid particles of copolymerized CTBN and co-reactant, the matrix having a lapshear strength at 20.degree. C. at least 50% greater than that of a fully cross-linked polyimide cured from the co-reactant alone.

Curable thermosetting prepolymerised imide resin compositions

A novel method for preparing a thermosetting imide resin composition which consists of chemically reacting a liquid mixture of a carboxy-(CTBN) or vinylidene-(VTBN) polybutadiene/acrylonitrile and a co-reactant comprising

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Saffron Walden, United Kingdom

Stephen J Shaw