Polyester impact modifier

The present invention discloses a composition consisting of: (1) from about 15% to about 40% by weight of isosorbide monomer repeating units; (2) from about 25% to about 60% by weight of monomer repeat units of a dicarboxylic acid or anhydride, such as succinic acid or anhydride; and (3) a polyester consisting of from about 10% to about 20% by weight of monomeric repeating units of a polyol, such as 1, 3-propylene glycol. In some cases, the polymer may also include monomer repeating units of a methyl nadic anhydride or nadic anhydride. Also disclosed is a polymer composition comprising a polyester and a biodegradable polymer selected from the group consisting of polylactic acid, polyhydroxyalkanoates, and mixtures thereof. 本发明公开了一种由：(1)约15％至约40％重量百分比的异山梨醇单体重复单元；(2)约25％至约60％重量百分比的例如丁二酸或酸酐的二羧酸或酸酐的单体重复单元；和(3)约10％至约20％重量百分比的例如1,3-丙二醇的多元醇的单体重复单元组成的聚酯。在一些情况下，所述聚合物还可以包括甲基纳迪克酸酐或纳迪克酸酐的单体重复单元。本发明还公开了一种聚合物组合物，其包括聚酯和选自由聚乳酸、聚羟基烷酸酯、及其混合物组成的组的可生物降解聚合物。