Carbon fiber strand

Title: Carbon fiber strand

Related Patent Categories: Stock Material Or Miscellaneous Articles, Coated Or Structually Defined Flake, Particle, Cell, Strand, Strand Portion, Rod, Filament, Macroscopic Fiber Or Mass Thereof, Rod, Strand, Filament Or Fiber

Brief Patent Description - Full Patent Description - Patent Claims

The Patent Description & Claims data below is from USPTO Patent Application 20050271874, Carbon fiber strand.

1. A carbon fiber strand obtained by impregnating a carbon fiber with a sizing agent composition containing a sizing agent comprising at least two kinds of epoxy resins, wherein the sizing agent composition is such that, when it is mixed with a given curing agent at proportions of 100 parts by mass (the sizing agent composition) and 30 parts by mass (the curing agent) to make a composition for estimation, the composition for estimation is heat-treated at 130.degree. C. for 2 hours, and the resulting cured material for estimation is measured for dynamic viscoelasticity to obtain its tan 6 of a relaxation peak and its tan .delta. of .beta. relaxation peak, their product .alpha..sub.tan .delta. .beta..sub.tan .delta. is 0.07 to 0.2.

2. A carbon fiber strand according to claim 1, wherein the sizing agent composition has a Viscosity of 100 to 10,000 poises at 30.degree. C.

3. A carbon fiber strand according to claim 1, wherein the sizing agent contained in the sizing agent composition contains a PO/EO block copolymer in an amount of less than 30% by mass relative to the epoxy resins.

4. A carbon fiber strand according to claim 1, wherein the content of the sizing agent composition is 0.3 to 5.0% by mass.

5. A carbon fiber strand according to claim 1, which is constituted by 1,000 to 50,000 single fibers.

6. A carbon fiber strand according to claim 1, wherein the carbon fibers constituting the carbon fiber strand show a surface oxygen concentration ratio O/C of 0.05 to 0.3 when measured by X-ray photoelectron spectroscopy.

Brief Patent Description - Full Patent Description - Patent Claims

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Method for manufacturing polarizing film and polarizing film and optical film manufactured by using the method
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Industry Class:
Stock material or miscellaneous articles

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