Opaque pp/pla bopp films with broad processing window

Patent metadata

Field	Value
Publication number	US-2016108191-A1
Application number	US-201414518112-A
Country	US
Kind code	A1
Filing date	Oct 20, 2014
Priority date	Oct 20, 2014
Publication date	Apr 21, 2016
Grant date	—

Abstract

A film having a polypropylene and polylactic acid blend having a haze of from about 10% to about 100% and a gloss 45° of from about 20 to about 150.

First claim

What is claimed is:

1 . A film comprising a polypropylene and a polylactic acid blend having a haze of from about 10% to about 100% and a gloss 45° of from about 50 to about 150.

2 . The film of claim 1 wherein the polypropylene further comprises a polypropylene homopolymer, a high crystallinity polypropylene, a polypropylene heterophasic copolymer, a polypropylene copolymer, or combinations thereof.

3 . The film of claim 1 with a DSC first melting point of 160° C. to 170° C.

4 . The film of claim 1 wherein: the polypropylene is present in an amount of from 51 wt. % to 99 wt. % by weight of the blend, and the polylactic acid is present in an amount of 1 wt. % to 40 wt. % by weight of the blend.

5 . The film of claim 1 further comprising a cavitating booster which comprises a polypropylene functionalized with a maleated PP.

6 . The film of claim 1 further comprising a silica-based matting agent.

7 . The film of claim 6 , wherein the silica-based matting is present in an amount of between 0.1% and 2% by weight of the blend.

8 . The film of claim 1 further comprising an inorganic filler.

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

10 . The film of claim 8 wherein the inorganic filler comprises calcium carbonate, titanium dioxide, kaolin, alumina trihydrate, calcium sulfate, talc, mica, glass microspheres, or combinations thereof.

11 . The film of claim 10 wherein the inorganic filler is calcium chloride and the calcium chloride is present in an amount of from 1% to 30% by weight of the blend.

12 . An opaque film comprising of a polylactic acid and polypropylene blend having a haze of about 90%-100% and a gloss 45° of from about 20 to about 150.

13 . The film layer of claim 12 wherein the film is biaxially oriented.

14 . The film of claim 12 having an opaque film density of between 0.50 and 0.70 g/cc as measured by ASTM D792.

15 . The film of claim 12 having an opaque film modulus of between 200 and 250 kpsi as measured by ASTM D882.

16 . The film of claim 12 having a break strength of between 12,000 and 23,000 psi as measured by ASTM D882.

17 . The film of claim 12 having a break elongation between 30% and 80% as measured by ASTM D882.

18 . The film of claim 12 wherein the machine direction yield strength as measured by bi-axial stretching by Bruckner lab stretcher ranges from about 1 MPa to about 10 MPa.

19 . The film of claim 12 , wherein the film is a single layer film.

20 . The film of claim 12 , wherein the film has a plurality of layers, wherein at least one of the layers is comprised of 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

• C08J2323/12

  Polypropene · CPC title

• C08L23/10

  Homopolymers or copolymers of propene · CPC title

• C08J2467/04

  Polyesters derived from hydroxy carboxylic acids, e.g. lactones (C08J2467/06 takes precedence) · CPC title

• C08J2467/02

  Polyesters derived from dicarboxylic acids and dihydroxy compounds (C08J2467/06 takes precedence) · CPC title

• C08J5/18 Primary

  Manufacture of films or sheets · CPC title