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Polymer blends with improved rheology and improved unnotched impact strength

A technology of polymers and blends, applied in the field of polymer blends, can solve problems such as lack of stability, and achieve the effect of improving temperature stability

Active Publication Date: 2010-11-03
NOVAMONT SPA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, a single homopolymer or copolymer by itself may not be sufficiently stable over a wide temperature range

Method used

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  • Polymer blends with improved rheology and improved unnotched impact strength
  • Polymer blends with improved rheology and improved unnotched impact strength

Examples

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Embodiment

[0298] The polymer blends of the present invention and their preparation, including the preparation of representative polyesters, are further illustrated by the following examples. The glass transition temperature (Tg) of the blend was determined using a TA Instruments 2950 Differential Scanning Calorimeter (DCS) at a scan rate of 20°C / min.

[0299] In the following examples, blends were prepared using the general method: Blends of PLA and AAPE were prepared by compounding in a Sterling 1.25 inch single screw extruder. A typical method is as follows: each raw material is dried overnight at 60-70°C until the moisture content is less than 50ppm. The components were blended in bags and then fed into the barrel of the extruder through the hopper at the desired rate using an AccuRate feeder.

[0300] The prepared blend was molded on a Toyo 90 injection molding machine under the following conditions. These conditions should not be considered ideal conditions, but are typical condi...

Embodiment 7-12

[0335] Examples 7-12: AAPE is Eastar Bio, PLA is UnitikaTE4000.

[0336] Examples 13-17: AAPE is ECOFLEX, PLA is Cargill-Dow 5429B.

[0337] Eastar Bio polymer is a composition comprising 45 mole percent terephthalic acid, 55 mole percent adipic acid and 100 mole percent 1,4-butanediol, wherein the total mole percent of diols is equal to 100 mole percent, The total mole percent of diacids equals 100% moles; B1008A is 50% by weight Eastar Bio and 50% by weight calcium carbonate.

[0338]

[0339] Based on the above data it is clear that the composition of interest here is unique and depends on the ratio of the AAPE / PLA blend, not on the nature of the PLA or AAPE itself.

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Abstract

This invention relates to a blend of biodegradable polymers comprising: (A) about 15% to about 60% by weight of at least one flexible biodegradable polymer (A) having a glass transition less than about 0 DEG C., (B) about 85% to about 40% by weight of at least one rigid biodegradable polymer (B) having a glass transition greater than about 10 DEG C.; said percentages being based on the total weight of the polymer blend; wherein said polymer blend has a unnotched Izod impact strength according to ASTM D256 of at least 9 ft-lbs / in at 23 DEG C. In one embodiment, the polymer blend has a unnotched Izod impact strength according to ASTM D256 at least 20 ft-lbs / in at 23 DEG C.

Description

field of invention [0001] The present invention generally relates to biodegradable polymer blends. In order to obtain blends with improved rheology and unnotched Izod impact strength, it is preferred that the present invention relates to blends of two biopolymers such as biodegradable polyester and polyester amides. The biodegradable polymer blends are suitable for a variety of applications. Background of the invention [0002] Biodegradable materials consist of components that degrade from polymeric dimensions to monomers or short chains (which are subsequently assimilated by microorganisms) by microorganism-catalyzed degradation, thereby reducing strength. In an aerobic environment, these monomers or short chains are eventually oxidized to CO 2 、H 2 O and new cellular biomass. In anoxic environment, these monomers or short chains are eventually oxidized to CO 2 、H 2 O, acetate, methane, and cellular biomass. Successful biodegradation requires that direct physical c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/00C08L67/04C08L67/02
CPCC08L67/04C08J5/18C08L2205/02C08J2367/02C08K5/0016C08J2367/04C08L67/02C08L2666/18C08L101/16C08L67/00
Inventor W·R·哈尔C·M·坦纳
Owner NOVAMONT SPA
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