Toughened poly(lactic acid) compositions
AssigneeE.I. du Pont de Nemours and Company
InventorEdmund Arthur Flexman
Life of this patent
Estimating the term…
Abstract
Toughened poly(lactic acid) resin compositions comprising poly(lactic acid) and an impact modifier comprising an ethylene copolymer made from monomers (a) ethylene; (b) one or more olefins of the formula CH2═C(R1)CO2R2, where R1 is hydrogen or an alkyl group with 2-8 carbon atoms and R2 is an alkyl group with 1-8 carbon atoms, such as methyl, ethyl, or butyl; and (c) one or more olefins of the formula CH2═C(R3)CO2R4, where R3 is hydrogen or an alkyl group with 1-6 carbon atoms, such as methyl, and R4 is glycidyl. The ethylene copolymer may further be made from carbon monoxide monomers. The compositions may further comprise one or more ethylene/acrylate and/or ethylene/vinyl ester polymers, ionomers, and cationic grafting agents.
Claims17
A poly(lactic acid) composition, comprising:
- (i) about 60 to about 97 weight percent poly(lactic acid), and
- (ii) about 3 to about 40 weight percent of an impact modifier comprising an ethylene copolymer derived from copolymerizing:
- (a) about 20 to about 95 weight percent ethylene;
- (b) about 3 to about 70 weight percent of one or more olefins of the formula CH2═C(R1)CO2R2, where R1 is hydrogen or an alkyl group with 1-8 carbon atoms and R2 is an alkyl group with 1-8 carbon atoms;
- and
- (c) about 0.5 to about 25 weight percent of one or more olefins of the formula CH2═C(R3)CO2R4, where R3 is hydrogen or an alkyl group with 1-6 carbon atoms, and R4 is glycidyl,
- wherein the weight percentages of the poly(lactic acid) and the impact modifier are based on the total weight of the poly(lactic acid) and the impact modifier.
Dependencies are inferred from the claim text.