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 inv
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.
대표청구항▼
1. A composition, comprising a biodegradable branched polymer blend formed by reactive blending of: a. polylactic acid (PLA); andb. 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 5
1. A composition, comprising a biodegradable branched polymer blend formed by reactive blending of: a. polylactic acid (PLA); andb. 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. 2. The composition of claim 1, wherein the renewable carbon content of the biodegradable branched polymer blend is at least 99% by weight of the blend. 3. The composition of claim 1, wherein the branching agent is selected from: dicumyl peroxide, t-amyl-2-ethylhexyl peroxycarbonate, 1,1-bis(t-butylperoxy)-3,3,5-trimethylcyclohexane, 2,5-dimethyl-2,5-di(t-butylperoxy) hexane, 2,5-dimethyl-2,5-di(t-amyl peroxy) hexane, 2,5-bis(t-butylperoxy)-2,5-dimethylhexane, 2,5-dimethyl-di(t-butylperoxy)hexyne-3, di-t-butyl peroxide, benzoyl peroxide, di-t-amyl peroxide, t-butyl cumyl peroxide, n-butyl-4,4-bis(t-butylperoxy)valerate, 1,1-di(t-butylperoxy)-3,3,5-trimethyl-cyclohexane, 1,1-di(t-butylperoxy)cyclohexane, 1,1-di(t-amylperoxy)-cyclohexane, 2,2-di(t-butylperoxy)butane, ethyl-3,3-di(t-butylperoxy)butyrate, 2,2-di(t-amylperoxy)propane, ethyl-3,3-di(t-amylperoxy)butyrate, t-butylperoxy-acetate, t-amylperoxyacetate, t-butylperoxybenzoate, t-amylperoxybenzoate, and di-t-butyldiperoxyphthalate or combinations thereof. 4. The composition of claim 1, wherein the PLA and the PHA polymer were reactively blended with a branching agent in the presence of a co-agent. 5. The composition of claim 4, wherein the co-agent is diallyl phthalate, pentaerythritol tetraacrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate, dipentaerythritol pentaacrylate, diethylene glycol dimethacrylate, bis (2-methacryloxyethyl) phosphate, or combinations thereof. 6. The composition of claim 4, wherein the co-agent is an epoxy-functional styrene-acrylic polymer, an epoxy-functional acrylic copolymer, an epoxy-functional polyolefin copolymer, an oligomer comprising a glycidyl group with an epoxy functional side chain, an epoxy-functional poly(ethylene-glycidyl methacrylate-co-methacrylate), or an epoxidized oil or combinations thereof. 7. The composition of claim 1, wherein the content of 4-hydroxybutyrate (4HB) in the PHA polymer is from 30% to 65% by weight of the PHA polymer. 8. The composition of claim 1, wherein the content of 4-hydroxybutyrate (4HB) in the PHA polymer is from 45% to 65% by weight of the PHA polymer. 9. The composition of claim 1, wherein the PHA polymer comprises an amorphous rubber phase having no melting point. 10. A film or multilayer laminate comprising at least one film layer comprising the composition of claim 1. 11. An article made with the laminate of claim 10, wherein the film has a thickness of about 1 to about 2 microns. 12. The article of claim 11, wherein the article is a bag, a packaging film or an agricultural mulch film. 13. A resin composition made from the composition according to claim 1. 14. A finished article made by extrusion processing of the resin composition of claim 13, wherein the article is an injection molded part, a thermoformed part, a film or a coating. 15. An article made with the composition of claim 1, wherein the article is a foam, a woven or nonwoven fiber, or a thermoformed part. 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); andb. 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, andwherein 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.
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이 특허에 인용된 특허 (67)
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