| abstract |
An aqueous emulsion type sizing agent for carbon fibers is disclosed. The sizing agent contains a compound represented by the following general formula (I): <IMAGE> (I) wherein A represents (C2H4O)l or (C2H4O)n(C3H6O)m[l is 18 to 70; n is 18 to 70; and m is 2 to 50 (1</=n/m</=35)]; a compound represented by the following general formula (II): <IMAGE> (II) wherein R represents CqH2q+1 or <IMAGE> (q is 10 to 18; and p is 15 to 70); and an epoxy resin, a process for preparation of the agent, and the method for using it are also disclosed. The sizing agent has excellent emulsion stability and heat stability, and it can impart excellent bundling properties to carbon fibers. |