| 摘要 |
1,170,218. PVC films. W. R. GRACE & CO. 2 Oct., 1968 [21 Dec., 1967], No. 46727/68. Heading C3P. Additives for PVC which is to be formed into films are 0À1-25% by wt. of the polymer of one or more of nitrilo-triacetic acid, nitrilo-triacetonitrile and imino-diacetic acid dialkyl ester in which the alkyl groups have 1-10 carbons. In the examples there is also present dibutyl tin iso-octyl thioglycolate. |
