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Polyester film of 2-butene-1, 4-diol and methyl vinyl ether-maleic anhydride copolymer crosslinked with n-vinyl-2-pyrrolidone and process for preparing same
Polyester film of 2-butene-1, 4-diol and methyl vinyl ether-maleic anhydride copolymer crosslinked with n-vinyl-2-pyrrolidone and process for preparing same