Patent ID: 8323743

Claim:
An acrylic-fiber finish for use in carbon-fiber production, the finish essentially comprising an epoxy-polyether-modified silicone; an amino-modified silicone; and a surfactant, wherein the weight ratio of the epoxy-polyether-modified silicone ranges from 1 to 95 wt % and the weight ratio of the surfactant ranges from 5 to 50 wt % in the total of the nonvolatile components of the finish, wherein the total weight ratio of the epoxy-polyether-modified silicone and the amino-modified silicone ranges from 50 to 95 wt % in the total of the non-volatile components of the finish, and the weight ratio between the epoxy-polyether-modified silicone and the amino-modified silicone ranges from 5:95 to 90:10; the epoxy-polyether-modified silicone is at least one compound selected from the group consisting of a compound represented by the chemical formula (1) shown below and a compound represented by the chemical formula (2) shown below, where each of the symbols in formulae (1) and (2) independently represents the meaning as follows: Ep: an epoxy group represented by the chemical formula (3) or (4) shown below A: a C 2 -C 4 alkylene group, where each “A” of (AO)r may be the same or different Ra: a C 1 -C 6 alkylene group Rb: a C 1 -C 6 alkylene group or an alkoxyalkylene group represented by —R 1 OR 2 — (where R 1 and R 2 represent C 1 -C 6 alkylene groups, which may be the same or different) Rc: a hydrogen atom or a C 1 -C 10 alkyl group r: an integer ranging from 1 to 50 p: an integer ranging from 1 to 10,000 q: an integer ranging from 1 to 100 s: an integer ranging from 1 to 100 t: an integer ranging from 1 to 100 B, D: a C 1 -C 3 alkyl group, C 1 -C 3 alkoxy group, hydroxyl group, or —Ra-(AO)r-Rb-Ep, where B and D may be the same or different F, G: a C 1 -C 3 alkyl group, C 1 -C 3 alkoxy group, hydroxyl group, —Rb-Ep, or —Ra-(AO)r-Rc, where F and G may be the same or different.