American Cyanamid Company

American Cyanamid

Kevin R Hirschbuehler

Dalip K Kohli

Robert E Evans

Bruce A Stern

Samuel Eugene Susman

Curable compositions comprising epoxide prepolymers and polyaminobenzoates, alone, or combined with reinforcements, e.g., graphite fibers, and, optionally modified with second resins. The cured resin fiber matrix compositions exhibit high toughness combined with excellent hot/wet strength.

Curable epoxy resin compositions

High-performance fiber resin matrix composites are disclosed which are comprised of a first layer comprising reinforcing filaments coated with a thermosetting resin composition and a discrete second layer of a thermoplastic resin. When the composite layers are matched to provide certain minimum strength and elongation properties, composites of unusually high impact strength and resistance to impact damage are achieved which retain their high performance properties over a range of temperatures and environmental exposures.

Thermoplastic interleafed resin matrix composites with improved impact

Improved fiber resin matrix prepreg fabrics are disclosed which are comprised of a first layer of reinforcing fabric coated with an epoxy resin composition and a discrete second layer of an epoxy resin modified with an elastomeric polymer. The discrete second layer is provided with a support comprising a gauze-like, lightweight fibrous mat or carrier of lightweight fibers that preserves the second 'interleaf' layer during cure. Cured composites having the continuous interleaf layer intact exhibit high impact strength and resistance to impact damage. 6

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Bel Air, MD, United States of America

Kevin R Hirschbuehler