Emulsion type sizing agent for carbon fibers, process for its preparation, and method for using same
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United States of America Patent
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Dec 13, 1983
Grant Date -
N/A
app pub date -
Sep 7, 1982
filing date -
Sep 7, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
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): ##STR1## wherein A represents (C.sub.2 H.sub.4 O).sub.l or (C.sub.2 H.sub.4 O).sub.n (C.sub.3 H.sub.6 O).sub.m [l is 18 to 70; n is 18 to 70; and m is 2 to 50 (1.ltoreq.n/m.ltoreq.35)]; a compound represented by the following general formula (II): ##STR2## wherein R represents C.sub.q H.sub.2q+1 or ##STR3## (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.
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