Copolyester Ether

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Information @ a Glance

  • Thermoplastic elastomers (TPE), sometimes referred to as thermoplastic rubbers, are a class of copolymers or a physical mix of polymers (usually a plastic and a rubber) which consist of materials with both thermoplastic and elastomeric properties.

  • Thermoplastic polyamides elastomers (COPA) consist of a regular linear chain of rigid polyamide segments interspaced with flexible polyether segments. They are basically segmented block copolymers having general structure.

  • Blends of Polycarbonate and thermoplastic copolyether ester elastomer (COPE) were made using a single screw extruder. The blend with 20 wt% of COPE gave optimum tensile properties. The elongation and strength at break were higher for this blend composition.

  • A special process for producing high molecular mass thermoplastic polyesters involves the polymerization of lactones in the presence of organometallic compounds.

  • The three principal methods for preparing COPA are the following: I. The formation of an acid-terminated soft segment, followed by the reaction of a diisocyanate and additional diacid to form polyester amide; II. The formation of an adipic acid-capped hard segment block of poly(11-aminoundecanoic)acid, joined with a soft segment of polyol in a polyesterification process; III. A process without ester linkage: the bonds between the two segments are amides.

  • Copolyester-ether elastomer markets and production are still predominantly concentrated in the United States, Europe and Japan. However, the fastest growing market is in Asia (excluding Japan), where demand is currently growing at approximately 10% per year and is forecast to grow at 710% per year through 2012.

  • Copolyester-ether elastomers are used in automotive, hose and tubing, medical, and wire and cable applications.

  • Consumption of copolyester-ether elastomers in the United States is fairly mature and is expected to grow at a moderate rate during 20072012. In Europe, consumption is projected to grow at a slightly faster rate. Under-the-hood automotive applications, where there is an increasing need to
    meet higher temperature requirements, will promote this growth. In Japan, where consumption is also driven by automotive applications, growth will be moderate from 2007 to 2012.

  • In commercial applications, COPEs can replace a variety of conventional
    materials, such as metal, cast polyurethane, leather, and rubber.

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