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US 4,902,752 AGranted
Polycyanate esters of polyhydric phenols blended with thermoplastic polymers
AssigneeHi-Tek Polymers, Inc.
InventorDavid A. Shimp
Life of this patent
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Abstract
Curable compositions are made from blends of polycyanate esters of polyhydric phenols and amorphous, aromatic thermoplastic resins which are initially soluble in the polycyanate ester but which phase separate during curing of the polycyanate ester.
Claims8
A cured composition comprised of a blend of:
- (A) a polycyanate ester of a polyhydric phenol;
- (B) an amorphous, aromatic thermoplastic resin which is initially soluble in the blend but which phase separates during cyclotrimerization of the polycyanate ester;
- and
- (C) a polycyanate curing catalyst,
- wherein B is present in the amount of about 5 to about 25 weight percent based on the weight of A and B,
- said cured composition having strain energy release rate values in the crack opening mode, G.sub.IC, in excess of 1.5 inch-pounds/inch.sup.2.
3 more elements
Dependencies are inferred from the claim text.