Toughened polyoxymethylene-poly(lactic acid) resin compositions comprising
polyoxymethylene, poly(lactic acid), and an impact modifier comprising an ethylene
copolymer impact modifier made from monomers (a) ethylene; (b) one or more olefins
of the formula CH2C(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 CH2C(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 impact modifier 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.
