Patent ID: 9593444
Date: 2017-03-14
CPC Classifications: D01F,D06M,Y10T

Claim:
1. A method for producing sizing agent-coated carbon fibers coated with at least one sizing agent [a], wherein a di- or higher functional epoxy compound (A1) selected from the group consisting of a phenol novolac type epoxy resin, a cresol novolac type epoxy resin, bisphenol A diglycidyl ether, and tetraglycidyldiaminodiphenylmethane and/or a mono or higher functional epoxy compound (A2) selected from the group consisting of sorbitol type polyglycidyl ether, glycidyl phthalimide and urea modified epoxy resin are/is used as component (A), wherein the epoxy equivalent of the component (A) Is less than 360 g/mol, said method comprising the steps of: coating carbon fibers 100 parts by mass with said sizing agent of 0.1 to 10 parts by mass; and heat-treating in a temperature range from 160 to 260°C for 30 to 500 seconds; wherein [a] is a sizing agent obtained by mixing at least 0.1 to 25 parts by mass of a tertiary amine compound and/or tertiary amine salt (B1) with a molecular weight of 100 g/mol or higher used as component (B), with 100 parts by mass of the component (A), wherein the tertiary amine compound and/or tertiary amine salt (B1) with a molecular weight of 100 g/mol or higher or the abovementioned [a ]is a tertiary amine compound and/or tertiary amine salt represented by the following general formula (III): where R 8 denotes any one of a hydrocarbon group with 1 to 22 carbon atoms, a group containing a hydrocarbon with 1 to 22 carbon atoms and an ether structure, a group containing a hydrocarbon with 1 to 22 carbon atoms and an ester structure, and a group containing a hydrocarbon with 1 to 22 carbon atoms and a hydroxyl group; and where R 9 denotes an alkylene group with 3 to 22 carbon atoms and may also contain an unsaturated group; and R 10 any one of a hydrogen, a hydrocarbon group with 1 to 22 carbon atoms, a group containing a hydrocarbon with 1 to 22 carbon atoms and an ether structure, a group containing a hydrocarbon with 1 to 22 carbon atoms and an ester structure, and a group containing a hydrocarbon with 1 to 22 carbon atoms and a hydroxyl group; or R 8 and R 10 may be combined with each other to form an alkylene group with 2 to 11 carbon atoms, or the following general formula (V): where R 14 to R 17 denote, respectively independently, any one of a hydrocarbon group with 1 to 22 carbon atoms, a group containing a hydrocarbon with 1 to 22 carbon atoms and an ether structure, a group containing a hydrocarbon with 1 to 22 carbon atoms and an ester structure, and a group containing a hydrocarbon with 1 to 22 carbon atoms and a hydroxyl group, or the following general formula (VI): where R 18 to R 24 denote, respectively independently, any one of a hydrocarbon group with 1 to 22 carbon atoms, a group containing a hydrocarbon with 1 to 22 carbon atoms and an ester structure, a group containing a hydrocarbon with 1 to 22 carbon atoms and an ester structure, and a group containing a hydrocarbon with 1 to 22 carbon atoms and a hydroxyl group.