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PROCESS FOR PRODUCING A BLOCK COPOLYMER OF ALPHA-AMINO ACID-N-CARBOXY ANHYDRIDE AND AN ISOCYANATE AND A PROCESS FOR PRODUCING SYNTHETIC LEATHER BY THE USE THEREOF
PROCESS FOR PRODUCING A BLOCK COPOLYMER OF ALPHA-AMINO ACID-N-CARBOXY ANHYDRIDE AND AN ISOCYANATE AND A PROCESS FOR PRODUCING SYNTHETIC LEATHER BY THE USE THEREOF