Sizing agents for carbon fibers.

摘要

A sizing agent for carbon fibers has the following three important constituents: an epoxy compound; a copolymer having within its molecule one segment which is an oxyalkylene derivative of a polycyclic phenol and one or two segments which are a monoester or a polyester, segments being connected through an ester linkage; and an oxyalkylene derivative of a substituted phenol.