Polymeric blends and articles made therefrom

Patent metadata

Field	Value
Publication number	US-9683086-B2
Application number	US-201514979692-A
Country	US
Kind code	B2
Filing date	Dec 28, 2015
Priority date	Jun 13, 2014
Publication date	Jun 20, 2017
Grant date	Jun 20, 2017

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 method of producing a biaxially oriented film comprising:
blending a polylactic acid (PLA) and a polyolefin (PO) to form a polymeric blend (PLA/PO blend) having a ratio of PLA to PO in the PLA/PO blend between 4:1 and 199:1, wherein the polyolefin is a polyethylene;
forming the PLA/PO blend into a film; and
biaxially orienting the film to form a 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.

2. The method of claim 1 , wherein the step of biaxially orienting the film comprises stretching the film in the longitudinal direction, the transverse direction or both at a temperature of between 65° C. to 120° C.

3. The method of claim 1 , wherein the step of biaxially orienting the film comprises stretching the film in the longitudinal direction, the transverse direction or both at a stretch speed of less than or equal to 500 m/min.

4. The method of claim 1 , further comprising prior to the step of forming the PLA/PO blend into the film:
adding a compatibilizer to the PLA/PO blend.

5. The method of claim 1 , further comprising prior to the step of forming the PLA/PO blend into the film:
adding a reactive modifier to the PLA/PO blend.

6. The method of claim 1 , further comprising prior to the step of forming the PLA/PO blend into the film:
adding an inorganic filler to the PLA/PO blend.

7. The method of claim 6 , wherein the inorganic filler is calcium carbonate, titanium dioxide, kaolin, alumina trihydrate, calcium sulfate, talc, mica, glass microspheres, or combinations thereof.

Assignees

• Fina Technology

Inventors

• Li Fengkui
• Ashbaugh John

Classifications

• C08J2323/08

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

• C08J2323/06

  Polyethene · CPC title

• B29C55/143

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

• C08J2367/04

  Polyesters derived from hydroxy carboxylic acids, e.g. lactones (C08J2367/06 takes precedence) · CPC title

• B29C55/005

  characterised by the choice of materials · CPC title