Polymer composition

Patent metadata

Field	Value
Publication number	US-10982089-B2
Application number	US-201916293847-A
Country	US
Kind code	B2
Filing date	Mar 6, 2019
Priority date	Jun 18, 2013
Publication date	Apr 20, 2021
Grant date	Apr 20, 2021

Abstract

A composition may contain a first polymer, a second polymer, and a block copolymer. The first polymer may be polylactic acid, starch, polybutylene succinate, poly(butylene adipate-co-terephthalate), or a mixture thereof. The second polymer may be polybutadiene, high impact polystyrene, or a mixture thereof. The block copolymer may be a block copolymer of polylactic acid and polybutadiene. The composition may be prepared by a process that includes contacting the first polymer with the second polymer and the block copolymer. Articles may be prepared from the composition.

First claim

The invention claimed is:

1. A process for preparing a composition comprising:
contacting a first polymer with a second polymer and with a block copolymer of polylactic acid (PLA) and polybutadiene (PB), wherein the block copolymer is selected from the group consisting of PLA-PB-PLA triblock copolymer, PLA-PB multiblock copolymer, PLA-PB star copolymers, PLA-PB comb copolymers, PLA-PB gradient containing block copolymers; and mixtures thereof;
wherein the first polymer is starch, and mixtures thereof;
wherein the second polymer comprises polybutadiene, wherein the polybutadiene has a weight average molecular weight of 280,000 to 360,000 g/mol.

2. The process according to claim 1 , wherein the contacting comprises melt blending the first polymer, the second polymer and the block copolymer, in a single step.

3. The process according to claim 1 , wherein the composition is extruded at a temperature of at least 90° C.

4. The process according to claim 1 , further comprising processing the composition using one or more polymer processing techniques selected from the group consisting of: film, sheet, pipe and fiber extrusion or coextrusion; blow molding; injection molding; rotary molding; foaming; and thermoforming.

Assignees

• Total Res & Technology Feluy

Inventors

• Coupin Thierry

Classifications

• C08L3/02

  Starch; Degradation products thereof, e.g. dextrin · CPC title

• B29L2023/22

  Tubes or pipes, i.e. rigid (bent tubes not for use as pipe couplings B29L2023/004) · CPC title

• B29C45/0001

  characterised by the choice of material · CPC title

• B29C48/18

  the components being layers · CPC title

• C08L67/02

  Polyesters derived from dicarboxylic acids and dihydroxy compounds (C08L67/06 takes precedence) · CPC title