Polymeric blends and articles made therefrom

Patent metadata

Field	Value
Publication number	US-9249268-B2
Application number	US-201414304392-A
Country	US
Kind code	B2
Filing date	Jun 13, 2014
Priority date	Jun 13, 2014
Publication date	Feb 2, 2016
Grant date	Feb 2, 2016

Abstract

A biaxially oriented film includes a PLA and polyolefin (PLA/PO) blend. The film has a haze of 80% or greater as measured by ASTM-D1003 and a 45° gloss of less than 50% as measured by ASTM-D-2457.

First claim

What is claimed is:

1. A biaxially oriented film comprising:
a PLA and polyolefin (PLA/PO) blend, the film having a haze of 80% or greater as measured by ASTM-D1003 and a 45° gloss of less than 50% as measured by ASTM-D-2457;
wherein the polyolefin is a polyethylene, and wherein the PLA/PO blend includes between 80 and 99.5 weight percent of the PLA.

2. The film of claim 1 , wherein the polyethylene is HDPE, LDPE, LLDPE or a combination thereof.

3. The film of claim 2 , wherein the HDPE has a density of from 0.945 to 0.962 g/cc as measured by ASTM D792.

4. The film of claim 1 , wherein the ratio of the PLA to the PO in the blend is between 4:1 and 199:1.

5. The film of claim 4 , wherein ratio of the PLA to the PO in the blend is between 9:1 and 19:1.

6. The film of claim 1 , wherein the PLA/PO blend further comprises a compatibilizer, wherein the compatibilizer content in the PLA/PO blend is between 1% and 5% by weight of the PLA/PO blend.

7. The film of claim 6 , wherein the compatibilizer is maleic anhydride-modified polyolefin, styrene-ethylene/butylene-styrene (SEBS), an epoxy-modified polyolefin, or a combination thereof.

8. The film of claim 7 , wherein the compatibilizer is an epoxy-functionalized polypropylene, an epoxy-functionalized polyethylene, an epoxy-functionalized polybutadiene, or a combination thereof.

9. The film of claim 1 , wherein the PLA/PO blend further comprises a reactive modifier.

10. The film of claim 9 , wherein the reactive modifier is an oxazoline-grafted polyolefin, a maleated polyolefin-based ionomer, an isocyanate (NCO)-functionalized polyolefin, or combinations thereof.

11. The film of claim 1 , wherein the haze is greater than 95%.

12. The film of claim 11 , wherein the 45° gloss is less than 20%.

13. The film of claim 1 , wherein the film has a haze that is greater than 99%.

14. The film of claim 1 , wherein the film has a haze that is about 100%.

15. The film of claim 1 , wherein the film has a 45° gloss that is less than 10%.

16. The film of claim 1 , wherein the polyethylene is HDPE having an MI 2 of from 0.1 to 5.0 dg/min, as measured by ASTM D-1238 at a temperature of 190° C. and a load of 2.16 kg.

17. The film of claim 1 , wherein the polyethylene is HDPE having a peak molecular weight (Mp) of greater than 10,000 g/mol, as measured by GPC.

18. The film of claim 1 , wherein the polyethylene is HDPE having a weight average molecular weight (Mw) of between 20,000 and 200,000 g/mol, as measured by GPC.

19. The film of claim 1 , wherein the polyethylene is HDPE having a polydispersity (Mw/Mn) of between 2 and 15.

20. The film of claim 1 , wherein the polyethylene is HDPE having a density of from 0.940 to 0.970 g/cc as measured by ASTM D792.

21. The film of claim 1 , wherein the PLA is a stereocomplex polylactic acid or surface-modified polylactic acid.

22. The film of claim 1 , wherein the PLA/PO blend includes between 90 and 95 weight percent of the PLA.

23. The film of claim 1 , wherein the film is stretched biaxially at an oven temperature of above 80° C. and has a haze of greater than 90%, as measured by ASTM-D1003.

24. The film of claim 1 , wherein the film is a single layer film.

25. The film of claim 1 , wherein the film is a multilayer film having one or more layers formed of the PLA/PO blend and an additional layer comprising syndiotactic polypropylene, low density polyethylene, linear low density polyethylene, medium density polyethylene, high density polyethylene, ethylene-propylene copolymers, butylenes-propylene copolymers, ethylene-butylene copolymers, ethylene-propylene-butylene terpolymers, ethylene-vinyl acetate copolymers, ethylene-vinyl alcohol copolymers, nylons, or combinations thereof.

Assignees

• Fina Technology

Inventors

• Li Fengkui
• Ashbaugh John

Classifications

• C08J2323/06

  Polyethene · CPC title

• C08J5/18 Primary

  Manufacture of films or sheets · CPC title

• B29C55/143

  firstly parallel to the direction of feed and then transversely thereto · CPC title

• B29K2067/046

  PLA, i.e. polylactic acid or polylactide · CPC title

• C08J2323/08

  Copolymers of ethene (C08J2323/16 takes precedence) · CPC title