Biobased rubber modified biodegradable polymer blends
First Claim
Patent Images
1. A composition, comprising a biodegradable branched polymer blend formed by reactive blending of:
- a. polylactic acid (PLA); and
b. a biodegradable polyhydroxyalkanoate (PHA) polymer having a glass transition temperature (Tg) of between −
5°
C. and −
50°
C. and a weight average molecular weight from 500,000 Daltons to 2,000,000 Daltons, wherein the PHA polymer is a copolymer of;
3-hydroxybutyrate and 4-hydroxybutyrate, wherein the content of 4-hydroxybutyrate in the PHA polymer is from about 25% to about 85% by weight of the PHA polymer;
wherein the copolymer of 3-hydroxybutyrate and 4-hydroxybutyrate is the sole PHA polymer in the polymer blend,wherein the content of the PHA polymer in the biodegradable branched polymer blend is between about 3% and about 40% by weight of the blend, andwherein the renewable carbon content of the biodegradable branched polymer blend is at least 95% by weight of the blend,wherein the biodegradable branched polymer blend was formed by reactive blending of the PLA and the PHA polymer with a branching agent.
4 Assignments
0 Petitions
Accused Products
Abstract
Compositions of biobased polymer blends of polymers and a polyhydroxyalkanoate copolymer are described. In certain embodiments, the copolymer is a multiphase copolymer blend having one phase a glass transition temperature of about −5° C. to about −50° C. Methods of making the compositions of the invention are also described. Also articles, films and laminates made from the compositions are described.
-
Citations
16 Claims
-
1. A composition, comprising a biodegradable branched polymer blend formed by reactive blending of:
-
a. polylactic acid (PLA); and b. a biodegradable polyhydroxyalkanoate (PHA) polymer having a glass transition temperature (Tg) of between −
5°
C. and −
50°
C. and a weight average molecular weight from 500,000 Daltons to 2,000,000 Daltons, wherein the PHA polymer is a copolymer of;3-hydroxybutyrate and 4-hydroxybutyrate, wherein the content of 4-hydroxybutyrate in the PHA polymer is from about 25% to about 85% by weight of the PHA polymer; wherein the copolymer of 3-hydroxybutyrate and 4-hydroxybutyrate is the sole PHA polymer in the polymer blend, wherein the content of the PHA polymer in the biodegradable branched polymer blend is between about 3% and about 40% by weight of the blend, and wherein the renewable carbon content of the biodegradable branched polymer blend is at least 95% by weight of the blend, wherein the biodegradable branched polymer blend was formed by reactive blending of the PLA and the PHA polymer with a branching agent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
-
-
16. A method of preparing a polylactic acid (PLA)/polyhydroxyalkanoate (PHA) polymer blend, comprising reactively blending in the presence of a branching agent,
a. polylactic acid (PLA); - and
b. a biodegradable polyhydroxyalkanoate (PHA) polymer having a glass transition temperature (Tg) of between −
5°
C. and −
50°
C. and a weight average molecular weight from 500,000 Daltons to 2,000,000 Daltons, wherein the PHA polymer is a copolymer of;3-hydroxybutyrate and 4-hydroxybutyrate, wherein the content of 4-hydroxybutyrate in the PHA polymer is about 25% to about 85% of the weight of the PHA polymer; wherein the copolymer of 3-hydroxybutyrate and 4-hydroxybutyrate is the sole PHA polymer in the polymer blend; wherein the content of the PHA polymer in the PLA/PHA polymer blend is from about 3% to about 40% by weight of the PLA/PHA polymer blend, and wherein the renewable carbon content of the PLA/PHA polymer blend is at least 95% by weight of the PLA/PHA polymer blend; thereby forming a PLA/PHA polymer blend.
- and
Specification