High melt viscosity polyester or co-polyester compositions

A technology of copolyester and copolyetherester, applied in the field of polyester or copolyester elastomer composition

Inactive Publication Date: 2012-11-14
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, when articles made from copolyester elastomer blends containing ionomers are exposed to elevated temperatures of 60°C, the articles can undergo changes in their hardness and can exhibit phase separation, resulting in the formation of layers

Method used

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  • High melt viscosity polyester or co-polyester compositions
  • High melt viscosity polyester or co-polyester compositions
  • High melt viscosity polyester or co-polyester compositions

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0061] Preparation of melt mix compositions

[0062] The compositions described herein are melt-mixed blends in which all of the polymer components are uniformly dispersed in each other and all of the non-polymeric components are uniformly dispersed in and bound by the polymer matrix such that the blend form a unified whole. Any melt mixing method may be used to mix the polymeric and non-polymeric components of the present invention.

[0063] For example, the polymeric component and the non-polymeric component can be added to a melt mixer, such as a single-screw or twin-screw extruder; a mixer; a single-screw or twin-screw kneader, or a Banbury mixer, which can be obtained by The single-step addition is done all at once, or in a stepwise fashion, followed by melt mixing. When the polymeric and non-polymeric ingredients are added in a stepwise manner, a portion of the polymeric and / or non-polymeric ingredients are added first and then melt mixed with the remaining polymeric...

Embodiment

[0079] The Examples provide further details for the methods described herein.

[0080] Material

[0081] The following materials were used to prepare the melt blend compositions in the Examples and Comparative Examples.

[0082] Its polyester thermoplastic elastomer 1 (TPC1) : a copolyetherester elastomer comprising about 40% by weight of poly(tetrahydrofuran) terephthalate having an average molecular weight of about 1000 g / mol as copolyester long-chain ester units, said weight percent being based on the total weight of the copolyetherester elastomer weighing scale. The short-chain ester units are polybutylene terephthalate segments.

[0083] Copolyester thermoplastic elastomer 2 (TPC2) : a copolyetherester elastomer comprising about 77% by weight of poly(tetrahydrofuran) terephthalate having an average molecular weight of about 2000 g / mol as copolyester long-chain ester units, said weight percentage being based on the total weight of the copolyetherester elastomer we...

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Abstract

Processes of decreasing the melt flow rate of a polyester selected from the group consisting of polyesters derived from one or more dicarboxylic acids and one or more diols having more than two carbon atoms, copolyester thermoplastic elastomers, and mixtures of these, by melt mixing with the polyester an alkali metal salt having a molecular weight less than 300 to provide a melt mixed composition. Processes of making a melt extruded article from such melt mixed compositions and the articles made therefrom.

Description

field of invention [0001] Said invention relates to the field of polyester or copolyester elastomeric compositions especially suitable for the preparation of articles by melt extrusion processes. Background of the invention [0002] Polymer compositions with high melt viscosity are ideally used to prepare hollow structures involving melt extrusion processes such as blow molding, profile extrusion, and wave extrusion in which molten material flows through a die assembly and is shaped into the final part. Blow molding is especially useful for producing hollow structures. Typically, a parison of plastic material in a thermo-moldable condition manufactured by extrusion or injection molding is placed between two halves of an open blow molding having a mold cavity of the shape corresponding to the desired shape of the product. During extrusion blow molding, the parison gradually moves and stretches under the influence of gravity. When the parison reaches the proper length, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08K3/10C08J5/00C08L67/02
CPCC08K5/098C08J5/00C08K2003/262C08K3/10C08L67/02C08K3/26C08G63/183
Inventor P.L.塞克利D.J.赖利
Owner EI DU PONT DE NEMOURS & CO
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