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US 5,688,554 AGranted
Method of sizing carbon fibers
AssigneeTakemoto Yushi Kabushiki Kaisha
InventorsYoshihiko Nakaoka, Osamu Makino
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Abstract
A sizing agent is prepared from at least one specified kind of ester and at least one specified polyepoxy compound. A water-based sizing agent is prepared by emulsifying or dispersing it in water and is applied to carbon fibers at a specified ratio as sizing agent to improve lubricity, abrasion durability and spreadability of the carbon fibers at the same time.
Claims9
A method of sizing carbon fibers, said method comprising the steps of:
- preparing a water-based sizing agent by emulsifying or dispersing in water a sizing agent comprising at least one ester and at least one polyepoxy compound having at least two epoxy groups at weight ratio of 2/98-16/84;
- and
- applying said water-based sizing agent to carbon fibers such that said sizing agent is attached to said carbon fibers at a rate of 0.1-5.0 weight % with respect to said carbon fibers;
- said at least one ester being one or more selected from the group consisting of Group A, Group B and Group C;
- said Group A consisting of esters obtained by esterifying completely aliphatic dihydric-hexahydric alcohol having 2-20 carbon atoms with aliphatic monocarboxylic acid having 6-26 carbon atoms and containing 50-95 molar % of aliphatic monoenic monocarboxylic acid;
- said Group B consisting of esters obtained by esterifying completely aliphatic dihydric-hexahydric (poly)etherpolyol with aliphatic monocarboxylic acid having 6-26 carbon atoms and containing 50-95 molar % of aliphatic monoenic monocarboxylic acid;
- and
- said Group C consisting of esters obtained by esterifying completely aliphatic monohydric alcohol having 6-26 carbon atoms and containing 50-95 molar % of unsaturated aliphatic alcohol with aliphatic dicarboxylic-hexacarboxylic acid having 2-20 carbon atoms.
5 more elements
Dependencies are inferred from the claim text.