Patent ID: 9565882
Date: 2017-02-14
CPC Classifications: A41G,D01F,D06P

Claim:
1. A method for fixing a dye in a dyed regenerated collagen fiber, comprising the steps of: dyeing a regenerated collagen fiber with an aqueous solution of least one kind of a dye selected from the group consisting of 1:1 type metal complex salt dyes, 1:2 type metal complex salt dyes and reactive dyes, and then immersing a dyed regenerated collagen fiber in an aqueous solution of hydrochloride of condensation compounds of polyalkylenepolyamine and dicyandiamide for 10 to 30 minutes so that the condensation compounds form a hydrogen bond to a carboxyl group in the regenerated collagen fiber; and drying the immersed dyed regenerated collagen fiber at a predetermined temperature, wherein the pH of the aqueous solution is in the range of 8.5 to 9.5 and the temperature there of is in the range of 55 to 65° C.