Elastic fiber having good stable viscosity and dye fastness property and process of producing the same

摘要

An elastic fiber having good stable viscosity and dye fastness and a manufacturing method thereof are provided to melt and mix the hyper-branched polymer with the conventional polyurethane polymer with a proper rate. A hyper-branched polymer is mixed with polyurethane by the ratio of 1:99 to 15:85 and then the spin process is performed so that the polyurethane elastic fiber is manufactured. The polyurethane precursor is manufactured by the reaction of the organic diisocyanate and the high polymer diol. The polyurethane precursor is dissolved in the organic solvent and reacted with diamine and mono amine so that the segment polyurethane used to manufacture polyurethane is manufactured. The examples of the organic di-isocyanate is 4,4'-diphenylmethane diisocyanate, 1,5'-naphthalene diisocyanate, 1,4'-phenylene diisocyanate, hexamethylene diisocyanate, 1,4'-cyclohexane diisocyanate, 4,4'-dicyclohexyl methane diisocyanate and isophoron diisocyanate and the like.