EP0100410A2 — High strength and high elongation carbon fiber bu…

Claim 1

Independent Claim 87 words

A high strength and high elongation carbon fiber bundle, wherein the strength and elongation measured according to the strand tensile test method as stipulated in Japanese Industrial Standard (JIS)-R-7601 are about 420 to 650 kg/mm and about 1.7 to 2.5%, respectively, and wherein the broken ends of the carbon fibers protrude beyond the broken surface of the test piece used in said strand tensile test, and the average protrusion length of these broken ends is about 1.0 to 5.0 times the diameter of the carbon fiber monofilament.

Claim 2

Dependent Claim 87 words

A high strength and high elongation carbon fiber bundle, wherein the strength and elongation measured according to the strand tensile test method as stipulated in Japanese Industrial Standard (JIS)-R-7601 are about 420 to 650 kg/mm and about 1.7 to 2.5%, respectively, and wherein the broken ends of the carbon fibers protrude beyond the broken surface of the test piece used in said strand tensile test, and the average protrusion length of these broken ends is about 1.0 to 5.0 times the diameter of the carbon fiber monofilament.

Claim 3

Dependent Claim 48 words

A high strength and high elongation carbon fiber bundle as set forth in claim 1, wherein the average length of the broken ends of the carbon fibers protruding beyond the broken surface of the test piece is 1.2 to 3.0 times the diameter of the carbon fiber monofilament.

Claim 4

Dependent Claim 69 words

A high strength and high elongation carbon fiber bundle as set forth in claim 1 or claim 2, wherein the number of the carbon fibers having a protrusion length of the broken ends protruding beyond the broken surface of the test piece, of 5.0 to 20 times the diameter of the monofilament accounts for 10 to 80% of the total number of the monofilaments constituting the carbon fiber bundle.

Claim 5

Dependent Claim 53 words

A high strength and high elongation carbon fiber bundle as set forth in claim 1, wherein the carbon fiber bundle has an average monofilament strength of about 350 to 600 kg/mm2, an average monofilament elongation of about 1.4 to 2.2% and an interlayer shear strength of about 8 to 10 kg/mm 2 .

Claim 6

Dependent Claim 55 words

A high strength and high elongation carbon fiber bundle as set forth in claim 4, wherein the carbon fiber bundle has an average monofilament strength of about 400 to 600 kg/mm 2 , an average monofilament elongation of about 1.6 to 2.2% and an interlayer shear strength of about 8 to 9 kg/mm 2 .

Claim 7

Dependent Claim 41 words

A high strength and high elongation carbon fiber bundle as set forth in claim 3, wherein the number of the monofilaments constituting the carbon fiber bundle is about 1,000 to 30,000 and the monofilament diameter is about 3 to 7 µ.

Claim 8

Dependent Claim 82 words

A process for producing a high strength and high elongation carbon fiber bundle, which comprises heat-treating an acrylic fiber bundle comprising an acrylonitrile polymer containing at least 95% by weight of acrylonitrile, said acrylic fiber bundle having an iodine adsorption level of about 1 to 3% by weight when subjected to an iodine adsorption treatment, the skin layer formed around the monofilament cross-section by said iodine adsorption being about 0.5 to 3 µ in thickness, the monofilament fineness being about 0.4 to

Claim 9

Dependent Claim 82 words

A process for producing a high strength and high elongation carbon fiber bundle, which comprises heat-treating an acrylic fiber bundle comprising an acrylonitrile polymer containing at least 95% by weight of acrylonitrile, said acrylic fiber bundle having an iodine adsorption level of about 1 to 3% by weight when subjected to an iodine adsorption treatment, the skin layer formed around the monofilament cross-section by said iodine adsorption being about 0.5 to 3 µ in thickness, the monofilament fineness being about 0.4 to

Claim 10

Dependent Claim 114 words

5 denier and the total number of the monofilaments being 1,000 to 30,000, according to the following steps: ( I ) a step of converting said fiber bundle into an oxidized fiber bundle having about 3.7 - 7.0% by wt. of water regain by heating said fiber bundle under tension in an oxidizing atmosphere of about 200 to 350° C . (II) a step of carbonizing the produced oxidized fiber bundle by holding the fiber bundle in an inert atmosphere at temperature of at least about 1,200° C and the rates of temperature rise at 300 to 700° C and 1,000 to 1,200° C temperature ranges being about 100 to 1,000° C /min, respectively.

Claim 11

Dependent Claim 114 words

5 denier and the total number of the monofilaments being 1,000 to 30,000, according to the following steps: ( I ) a step of converting said fiber bundle into an oxidized fiber bundle having about 3.7 - 7.0% by wt. of water regain by heating said fiber bundle under tension in an oxidizing atmosphere of about 200 to 350° C . (II) a step of carbonizing the produced oxidized fiber bundle by holding the fiber bundle in an inert atmosphere at temperature of at least about 1,200° C and the rates of temperature rise at 300 to 700° C and 1,000 to 1,200° C temperature ranges being about 100 to 1,000° C /min, respectively.

Claim 12

Dependent Claim 61 words

A process for producing a high strengh and high elongation carbon fiber bundle as set forth in claim 7, wherein said fiber bundle before heat-treating contains about 0.2 to 2% by weight, based on fiber weight, of an oil finish consisting mainly of a higher alcohol and/or a higher fatty acid as well as a silicone and containing an organic antioxidant.

High strength and high elongation carbon fiber bundle and process for producing the same

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