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US 6,638,615 B2Granted
Carbon-fibers and a method of producing them
AssigneeToray Industries, Inc.
InventorsMasanobu Kobayashi, Mitsutoshi Ozaki, Youji Matsuhisa
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AssigneeToray Industries, Inc.
InventorsMasanobu Kobayashi, Mitsutoshi Ozaki, Youji Matsuhisa
Estimating the term…
The carbon fibers of the present invention have the are configuration as stated below to achieve the object; carbon fibers, characterized in that a polymer having polar groups and groups capable of reacting with a matrix resin are deposited on the fiber surfaces. Furthermore, the carbon fibers of the present invention can be produced by heating the carbon fibers, on the surfaces of which either (1) a monomer having both polar groups and groups capable of reacting with the matrix resin, or (2) the mixture of a monomer having polar groups and a monomer having groups capable of reacting with the matrix resin, is deposited, to polymerize the monomer. The present invention can provide carbon fibers unlikely to cause fluffing and fiber breaking even if rubbed by guide bars and rollers in sophisticated processing, and since they are excellent in adhesion properties to the matrix resin, a carbon fiber reinforced composite material excellent in bending properties and compressive properties can be obtained.
Carbon fibers comprising a composition deposited on a surface of said carbon fibers comprising a polymer having at least one polar group and at least one group capable of reacting with a matrix resin, wherein the polymer is substantially insoluble in said matrix resin and said polar group is selected from the group consisting of amido groups, imido groups, urethane groups, urea groups, isocyanate groups, sulfo groups, and mixtures thereof, said matrix resin is selected from the group consisting of an unsaturated polyester resin, vinyl ester resin and phenol resin, said group capable of reacting with said matrix resin selected from the group consisting of hydroxyphenoxy groups, phenoxy groups, phenolic hydroxyl groups vinyl groups, acrylate groups, methacrylate groups and mixtures thereof, and said fiber surfaces have a surface oxygen concentration O/C ratio of from about 0.02 to about 0.3 as measured by X-ray photoelectron spectroscopy.
Dependencies are inferred from the claim text.