Polymeric blend comprising polylactic acid
View Patent ↗A blend comprises at least 50 wt. % polylactic acid and at least 5 wt. % of polymer selected from one or more of: (i) ethylene/unsaturated ester copolymer having an unsaturated ester comonomer content of at least about 30% based on the weight of the ethylene/unsaturated ester copolymer; (ii) modified ethylene/unsaturated ester copolymer; (iii) polyetheramide block copolymer; (iv) propylene/ethylene copolymer comprising at least about 12% and at most about 16% ethylene monomer content based on the weight of the propylene/ethylene copolymer; and (v) styrenic block copolymer. An article such as a tray, film, or sheet may comprise the blend.
1. A blend comprising:
at least 50%, by weight of the blend, of polylactic acid; and
at least 5%, by weight of the blend, of polymer selected from one or more of:
(i) ethylene/unsaturated ester copolymer having an unsaturated ester comonomer content of at least about 30% based on the weight of the ethylene/unsaturated ester copolymer, wherein the unsaturated ester comonometer comprises vinyl ester of aliphatic carboxylic acid comonometer where the ester has from 4 to 12 carbon atoms;
(ii) modified ethylene/unsaturated ester copolymer;
(iii) polyetheramide block copolymer;
(iv) propylene/ethylene copolymer comprising at least about 12% and at most about 16% ethylene monomer content based on the weight of the propylene/ethylene copolymer; and
(v) styrenic block copolymer.
2. The blend of claim 1 comprising at most about 50%, by weight of the blend, of the polymer.
3. The blend of claim 1 comprising at most about 20%, by weight of the blend, of the polymer.
4. The blend of claim 1 comprising at least about 80%, by weight of the blend, of the polylactic acid.
5. The blend of claim 1 comprising at least 5%, by weight of the blend, of ethylene/unsaturated ester copolymer having an unsaturated ester comonomer content of at least about 30%, based on the weight of the ethylene/unsaturated ester copolymer.
6. The blend of claim 5 wherein the ethylene/unsaturated ester copolymer comprises at least about 30% vinyl acetate comonomer content based on the weight of the ethylene/unsaturated ester copolymer.
7. The blend of claim 5 wherein the ethylene/unsaturated ester copolymer comprises at least about 40% vinyl acetate comonomer content based on the weight of the ethylene/unsaturated ester copolymer.
8. The blend of claim 1 wherein the blend comprises at least 5%, by weight of the blend, of modified ethylene/unsaturated ester copolymer.
9. The blend of claim 8 wherein the modified ethylene/unsaturated ester copolymer comprises at least about 15% vinyl acetate comonomer content based on the weight of the ethylene/unsaturated ester copolymer.
10. The blend of claim 8 wherein the modified ethylene/unsaturated ester copolymer comprises at least about 30% vinyl acetate comonomer content based on the weight of the ethylene/unsaturated ester copolymer.
11. The blend of claim 1 comprising at least 5%, by weight of the blend, of polyetheramide block copolymer.
12. The blend of claim 11 wherein the polymer is polyetheramide block copolymer having a melting point of at most about 210° C.
13. The blend of claim 11 wherein the polymer is polyetheramide block copolymer having a melting point of at most about 160° C.
14. The blend of claim 1 wherein the blend comprises at least 5%, by weight of the blend, of propylene/ethylene copolymer comprising at least about 12% and at most about 16% ethylene monomer content based on the weight of the propylene/ethylene copolymer.
15. The blend of claim 14 wherein the propylene/ethylene copolymer is homogeneous.
16. The blend of claim 1 comprising at least 5%, by weight of the blend, of styrenic block copolymer.
17. The blend of claim 16 wherein the styrenic block copolymer is selected from one or more of styrene/butadiene/styrene copolymer, styrene/isoprene/styrene copolymer, styrene/ethylene-butylene/styrene copolymer, styrene/ethylene-propylene/styrene, and styrene/ethylene-propylene copolymer.
18. The blend of claim 16 wherein the styrenic block copolymer has a styrene comonomer content of at most about 40 wt. %, based on the weight of the styrenic block copolymer.
19. The blend of claim 16 wherein the styrenic block copolymer is styrene/butadiene/styrene copolymer having a butadiene comonomer content of at least about 60 wt. %, based on the weight of the styrene/butadiene/styrene copolymer.
20. The article comprising the blend of claim 1
21. The article of claim 20 wherein the article is a tray.
22. The article of claim 20 wherein the article is a tray and the blend forms a surface of the tray.
23. The article of claim 20 wherein the article is a film.
24. The article of claim 20 wherein the article is a multilayer film comprising at least one layer comprising the blend that is directly adhered to a layer comprising polyolefin.