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Thermoformable and toughened polyester

a technology applied in the field of thermoformable and toughened polyester, can solve problems such as shape distortion of parts

Inactive Publication Date: 2009-07-30
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, more complete crystallization from the melt of compositions is desirable in molding since an incompletely crystallized part may be more difficult to mold and if heated to elevated temperature may begin to crystallize, leading to shape distortion of the part.

Method used

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Examples

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Effect test

examples

[0085]The following Examples are illustrative, and are not to be construed as limiting the scope of the invention.

Materials Used

[0086]3GT-1: A 3GT homopolymer available commercially under the tradename SORONA from DuPont.[0087]I-1: an ethylene / methacrylic acid dipolymer (15 weight % MAA), neutralized with Na+ (59%), MI of 0.9 g / 10 min.[0088]I-2: an ethylene / methacrylic acid dipolymer (15 weight % MAA), neutralized with Zn+2 (58%), MI of 0.7 g / 10 min.[0089]I-3: an ethylene / methacrylic acid dipolymer (19 weight % MAA), neutralized with 2.5 weight% Mg(OH)2, MI of 1.1 g / 10 min.[0090]EMA-1: an ethylene / methyl acrylate dipolymer (30 weight % MA), MI of 3 g / 10 min.[0091]Nuc-1: sodium montanate obtained from Clariant under the tradename LICOMONT NaV101.[0092]AO-1: bis-(2,4-di-t-butylphenyl) pentaerythritol diphosphite antioxidant from GE Specialty Chemicals under the tradename ULTRANOX 626.[0093]Wax: processing wax available commercially as AC Wax 16A, Honeywell, Morristown, N.J.).

General P...

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Abstract

Disclosed is a composition comprising or produced from poly(trimethylene terephthalate), an ionomer of an ethylene acid copolymer comprising copolymerized units of at least one α,β-ethylenically unsaturated carboxylic acid comonomer, a nucleating agent and optionally an ethylene ester copolymer. Also disclosed are articles prepared from the composition. Also disclosed is a process for preparing the compositions, including methods for controlling the melt viscosity and strain hardening of the compositions.

Description

[0001]This application claims priority to U.S. provisional application Ser. No. 61 / 023220, filed Jan. 24, 2008; the entire disclosure of which is incorporated herein by reference.[0002]The invention relates to nucleated poly(trimethylene terephthalate) compositions, and methods for controlling their melt viscosity and elevated temperature stress-strain properties.BACKGROUND OF THE INVENTION [0003]Thermoplastic polymers are commonly used to manufacture various shaped articles that may be used in applications such as automotive parts, food containers, signs, and packaging materials. Shaped articles comprising polyester may be prepared from the molten polymer by a number of melt extrusion processes known in the art, such as injection molding, compression molding, blow molding, and profile extrusion.[0004]Shaped articles may also be produced by thermoforming in which a thermoplastic film or sheet is heated above its softening temperature and formed into a desired shape. This formed shee...

Claims

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Application Information

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IPC IPC(8): C08L23/26C08L33/00
CPCC08L23/0876C08L67/02C08L2666/06
Inventor TALKOWSKI, CHARLES JOHN
Owner EI DU PONT DE NEMOURS & CO