Carbon Fiber Coated With Sizing Agent Process For Producing Carbon Fiber Coated With Sizing Agent Prepreg And Carbon Fiber Reinforced Composite Material

Abstract: A carbon fiber coated with a sizing agent is provided. This carbon fiber exhibits excellent adhesion to a matrix resin ensures excellent stability of composite physical properties of a prepreg even after long term storage and is excellent in high order processability. A process for producing the carbon fiber coated with a sizing agent a prepreg and a carbon fiber reinforced composite material are also provided. A carbon fiber coated with a sizing agent which comprises (A) an aliphatic epoxy compound and (B) an aromatic compound that contains (B1) an aromatic epoxy compound as the essential component characterized in that the (a)/(b) ratio is 0.50 to 0.90 wherein (a) is the height (cps) of the peak at a binding energy of 284.6eV assignable to CHC C and C=C in the Ccore spectrum as determined by subjecting the surface of the sizing agent to X ray photoelectron spectroscopy using AlKa as the X ray source at a photoelectron emission angel of 15° and (b) is the height (cps) of the peak at a binding energy of 286.1eV assignable to C O therein.

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