| abstract |
A reinforcing carbon fiber bundle of the present invention is a reinforcing carbon fiber bundle with a sizing agent adhered to surfaces of carbon fibers, and characterized in that the sizing agent is constituted by at least two components, a first component does not melt at 150°C, and a second component is flowable at 150°C. Further, it is preferred that the second component is a copolymer resin, that the first component is a granular form, that the content (weight ratio) of the first component is twice or more that of the second component and that the first component is adhered to the fiber surfaces through the second component. Furthermore, it is preferred that the melting point of the first component is 150°C or more, and the melting point of the second component is less than 150°C. According to the invention, provided is the reinforcing carbon fiber bundle that is improved in impregnation property and openability, excellent in workability and optimum for a composite. |