Biodegradable laminate
AssigneeMitsubishi Chemical Corporation
InventorsKaoru Inoue, Yasuhiro Hirano, Kaname Kida
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Abstract
A biodegradable laminate, wherein a polyvinyl alcohol resin layer is laminated on at least one surface of an aliphatic polyester resin layer through an adhesive layer, which is excellent in biodegradability and gas barrier properties, and also excellent in interlayer adhesiveness, is obtained. The adhesive layer comprises, as a main component, a polyester resin (A′) which has a polar group and is obtained by graft polymerization of an α,β-unsaturated carboxylic acid or an anhydride thereof on a biodegradable polyester resin (A) comprising at least one structural unit selected from structural units represented by the following general formulae (1), (2), and (3):
Claims8
A biodegradable laminate comprising
- a polyvinyl alcohol resin layer laminated on at least one surface of an outer layer through an adhesive layer, the outer layer comprising at least one of polylactic acid and a succinic acid/1,4-butanediol/lactic acid polycondensate,
- wherein the adhesive layer comprises, in an amount of 90% by weight or more, a polyester resin (A′) which has a polar group and is obtained by graft polymerization of an anhydride of maleic acid or itaconic acid on a biodegradable polyester resin (A) comprising an adipic acid/terephthalic acid/1,4-butanediol polycondensate;
- wherein the amount of the anhydride of maleic acid or itaconic acid used in the graft polymerization is 0.025 to 0.5 parts by weight with respect to 100 parts by weight of the polyester resin (A).
Dependencies are inferred from the claim text.