Cytec Technology Corporation

Basf Aktiengesellschaft

Thomas Weber

Helmut Tesch

Hans G Recker

Jack D Boyd

Thomas Folda

Volker Altstaedt

Walter Heckmann

Herbert Stutz

Wolfgang Eberle

Hans-Gert Recker

Volker Altsaedt

J Timothy Hartness

The subject invention pertains to toughened thermosetting resin systems useful as structural adhesives and as matrix resins for thermosetting fiber-reinforced prepregs. These toughened resins employ a most minor amount of functionalized elastomeric particles having a T.sub.g of 10.degree. C. or below dispersed in a thermosetting base resin system.

Toughened, fiber-reinforced thermosetting resin matrix prepregs and

The incorporation of 2 to 35 .mu.m particles of a differentially soluble engineering thermoplastic into heat curable epoxy resin systems significantly increases the toughness of such systems without loss of other desirable properties. These toughened epoxy resin systems are useful in preparing carbon fiber reinforced composites having compression strength after impact (CAI) of greater than 45. Ksi 310 MPa after a 1500 in-lb/in impact.

Toughened thermosetting structural materials

Bismaleimide resin systems and fiber reinforced prepregs prepared therefrom having exceptional toughness are prepared by dispersing into a bismaleimide base resin system preformed functionalized elastomer particles having a T.sub.g of less than 10.degree. C.

Bismaleimide resin systems toughened by addition of preformed

The incorporation of 2 to 25 .mu.m particles of a limited class of polyimides having appreciable nonaromatic character into heat curable epoxy resin systems significantly increases the toughness of such systems without loss of other desirable properties. These toughened epoxy resin systems are useful in preparing carbon fiber reinforced composites having compression strength after impact (CAI) of greater than 45 Ksi after a 1500 in-lb/in impact.

A curable impact modified epoxy resin mixture suitable for producing high performance composites is composed of

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Ludwigshafen, Germany

Thomas Weber