Branched Aliphatic-Aromatic Polyester Blends

a polyester blend and aliphatic acid technology, applied in the direction of packaging, synthetic resin layered products, stoppers, etc., can solve the problems of rapid biodegradability, achieve better melt capillary stability, improve thermal stability, and increase melt strength

Inactive Publication Date: 2012-05-03
METABOLIX
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005]Combining (e.g, mixing or blending) the polymer blends in the presence of a reactive branching agent, e.g., peroxide, provides the following benefits compared to combining the polymer blends without any reactive chemistry: (1) higher melt strength, (2) improved thermal stability and/or better melt capillary stabilit

Problems solved by technology

In some applications, the rapid biodegradability of PHAs can be a proble

Method used

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  • Branched Aliphatic-Aromatic Polyester Blends
  • Branched Aliphatic-Aromatic Polyester Blends

Examples

Experimental program
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Effect test

example 1

Reactive Blend composition with PHA, PBAT, Organic Peroxide and Co-agent

[0147]In this example, rheological data for a PHA reactively melt-compounded with PBAT in the presence of an organic peroxide and co-agent is presented. Other additives included in the formulations were EMFORCE BIO™ calcium carbonate (Specialty Minerals), the plasticizer CITROFLEX™ A4 (Vertellus Specialties Inc.); a Slip / antiblock Master Batch which was a mixture composed of 15% by wt. Erucamide (Croda), 15% by wt. OPTIBLOCTM 10 talc filler (Specialty Minerals); a nucleating agent master batch (Nuc. MB) which was composed of cyanuric acid compounded at 33% by wt. into a base PHA resin of 3-hydroxybutanoic acid and 4-hydroxybutanoic acid and 68% by wt. PHA copolymer blend composed of about 34-38% homo-polymer of 3-hydroxybutanoic acid, and about 22-26% co-polymer of 3-hydroxybutanoic acid and 4-hydroxybutanoic acid, where the 4-hydroxybutanoic acid is approximately 10-12 weight percent, and about 38-42% co-polyme...

example 2

Blown Films Containing Aromatic / Aliphatic Polyester

[0151]In this example, blown films were made and tested for biodegradability. The following PHA formulation was made.

TABLE 3PHA Formulation for Blown FilmIngredientWt %PHA Blend78.00Nuc MB3.00CaCO35.00Slip Antiblock MB5.00CITROFLEX A48.73Peroxide0.18PE3A0.09

[0152]The PHA blend was composed of about 34-38% homo-polymer of 3-hydroxybutanoic acid, and about 22-26% co-polymer of 3-hydroxybutanoic acid and 4-hydroxybutanoic acid, where the 4-hydroxybutanoic acid is approximately 8-14 weight percent, and about 38-42% co-polymer of 3-hydroxybutanoic acid and 4-hydroxybutanoic acid with the 4-hydroxybutanoic acid composition being nominally 25-33 weight percent. The nucleating masterbatch (Nuc. MB) was cyanuric acid that had been previously compounded at a rate of 33% (by weight) into a base resin of 3-hydroxybutanoic acid and 4-hydroxybutanoic acid, and pelleted. The slip anti- block masterbatch was a mixture of erucamide (20% by weight) d...

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Abstract

Compositions of PHAs with aromatic/aliphatic polyester are described and methods of making the same.

Description

[0001]This application claims the benefit of U.S. Provisional Application No. 61 / 269,582, filed on Jun. 26, 2009. The entire teachings of the above application is incorporated herein by reference.BACKGROUND[0002]Biodegradable plastics are of increasing industrial interest as replacements or supplements for non-biodegradable plastics in a wide range of applications and in particular for packaging applications. One class of biodegradable polymers is the polyhydroxyalkanoates (PHAs), which are linear, aliphatic polyesters that can be produced by numerous microorganisms for use as intracellular storage material. Articles made from the polymers are generally recognized by soil microbes as a food source. There has therefore been a great deal of interest in the commercial development of these polymers, particularly for disposable consumer items. The polymers exhibit good biodegradability and useful physical properties.[0003]In some applications, the rapid biodegradability of PHAs can be a ...

Claims

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Application Information

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IPC IPC(8): B32B27/36C08L67/04C08G63/06
CPCB32B27/08B32B2605/00C08J5/18C08J2367/04C08L67/04C08G63/912C08L67/08C08G63/91Y10T428/31794C08J2367/02C08J2467/04C08L67/02B32B27/18B32B2270/00B32B2307/54B32B2307/558B32B2307/5825B32B2307/7145B32B2307/7163B32B2307/738B32B2410/00B32B2435/00B32B2439/00B32B2457/00B32B2509/00B32B2535/00B32B2553/00B32B2555/00B32B27/36C08G63/78C08J3/246C08K5/0083C08G2261/131
Inventor KRISHNASWAMY, RAJENDRA K.SUN, XIUDONG
Owner METABOLIX
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