Hitco, Inc.

Robert C Shaffer

William L Tarasen

Kenneth W Lewis

There are disclosed thermoplastic and thermosetting polymers which incorporate tungsten and/or molybdenum metal atoms. The metal atoms are incorporated into the polymer by reacting a monomer or polymer containing at least one free carboxyl group with a reaction product of tungsten or molybdenum and pyrrolidine.

Polymers containing chemically bonded metal atoms

A fibrous carbon material is first coated with a thermosetting material which remains flexible after being subjected to curing temperatures. The thermosetting material contains a refractory metal capable of reacting with boron to form a metal boride. This thermosetting resin is then cured. The fibrous carbon material is then impregnated with a second thermosetting resin containing a boron compound and, optionally, a refractory metal capable of reacting with boron to form a metal boride. The second thermosetting resin is at least partially cured and a plurality of layers of the fibrous material is then assembled to form a laminate. The laminate is heated to a temperature sufficient to carbonize the thermosetting resin. The resultant carbon-carbon composite has better oxidation resistance, improved high temperature stability, higher density and improved interlaminar tensile strength than does a composite prepared without the presence of the refractory metal in the thermosetting resin.

Carbon fabrics sequentially resin coated with (1) a metal-containing

An elastomer containing chemically bonded metal atoms is prepared by reacting a diene elastomer such as a nitrile rubber with the reaction product of an epoxy resin and a metal containing polymer. The metal containing polymer is prepared by reacting a polycarboxylic acid and a metal complex which is a reaction product of tungsten carbonyl and/or molybdenum carbonyl with pyrrolidine.

Elastomers containing chemically bonded metal atoms

Fibrous carbon material such as graphite cloth which is to be combined with a thermosetting resin and a boron containing compound to form a carbon-carbon composite is provided with a protective coating consisting of cured furfuryl alcohol copolymers. When formed into a laminate and heated to at least 2150.degree. C. to carbonize and at least partially graphitize the thermosetting resin, the boron greatly increases the interlaminar tensile strength while the coating protects the fibrous material from adverse effects of the boron which reduce the tensile strength in the directions of the fibers of the fibrous carbon material of the composite.

Coating for fibrous carbon material in boron containing composites

There are disclosed furfuryl alcohol copolymers of a polyester prepolymer of maleic acid or anhydride and a polyhydric alcohol which incorporate tungsten and/or molybdenum metal atoms. The metal atoms are incorporated into the copolymers by reacting the polyester prepolymer with a reaction product of tungsten or molybdenum and pyrrolidine.

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Playa del Ray, CA, United States of America

Robert C Shaffer