| abstract |
(57) [Summary] [Purpose] To provide a synthetic resin and a fiber which have a natural and supple texture, and which are excellent in touch, color and luster, and whose main component is poly-α-amino acid. [Structure] A polyamino acid urethane resin obtained by introducing an amino group and a mercapto group or a disulfide group into a side chain of a polymer obtained by copolymerizing an amino acid N-carbonic anhydride and polyurethane. [Effect] The fiber made of the polyamino acid urethane resin of the present invention has a supple texture, an excellent feel, combability, etc., and has a natural color and luster. In addition, acid dyeing is possible and shape retention can be imparted, just like natural protein fibers. Therefore, it is suitable for use in artificial hair, silk substitute fiber, and the like. |