Patent ID: 9689089
Date: 2017-06-27
CPC Classifications: C07K,D01D,D01F

Claim:
1. A solution-dyed protein fiber comprising: a protein fiber comprising at least one material selected from the group consisting of silk fibroin and a polypeptide derived from spider silk proteins; and a solution-dyeing colorant, wherein an amount of the silk fibroin in the protein fiber is in a range of 0-100 mass %, and an amount of the polypeptide derived from spider silk proteins therein is in a range of 100-0 mass %, when an amount of the protein fiber is 100 mass %, the solution-dyeing colorant is dissolved or dispersed in a spinning solution, of which the solution-dyed protein fiber is formed, the spinning solution further comprises dimethyl sulfoxide, or N,N-dimethylformamide, or a combination thereof, and at least one material selected from the group consisting of dimethyl sulfoxide and N, N-dimethylformamide is present in the solution-dyed protein fiber.