To provide a method for treating a regenerated collagen fiber having low water absorptivity and excellent touch in a wet state and capable of allowing a carboxyl group to be also chemically modified by treating the regenerated collagen fiber with a halogenated aldehyde, and subjecting the treated fiber to an amidation reaction by using a specific diamine and a condensing agent.
A regenerated collagen fiber is subjected to an insolubilizing treatment with a halogenated aldehyde of the formula XnRCHO [X is a halogen; R is a ≤3C hydrocarbon; (n) is an integer of 1-3], e.g. 2-chloroacetaldehyde, and the treated fiber is further subjected to an amidation treatment by using a diamine of the formula H2N(CH2)nSS(CH2)mNH2 [(n) and (m) are each an integer of 1-4] or H2NCH(COOR1)CH2SSCH2CH(COOR2)NH2 (R1 and R2 are each a 1-4C alkyl or benzyl) having a disulfide bond, e.g. cystamine dihydrochloride, and a condensing agent, e.g. 1-ethyl-3-(3'-dimethylaminopropyl) carbodiimide hydrochloride.
GOTO MASAOKI
MATSUMURA KUNIHIKO
HIROKAWA NORIO
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