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Methods for preparing polyether ester elastomer composition

a technology of polyether ester and composition, which is applied in the field of thermoplastic polyether ester elastomers, can solve the problems of unsuitable injection molding applications for unmodified polyether ester, difficult pelletization or flaking of polymer, and limited application prospects, etc., to achieve rapid crystallization, effective utilization of polymer, and rapid rigidity

Inactive Publication Date: 2011-01-27
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent is about a new type of polyether ester elastomer that has improved physical properties and faster processing times. The elastomer contains a nucleating agent, which helps to speed up the crystallization time and lower the crystallization half time. This results in faster demold times and shorter cycle times when making shaped articles. The nucleating agent also improves the physical properties of polyester polymers by increasing crystallization rate and crystallinity. Overall, this invention provides a better polymer for a variety of applications.

Problems solved by technology

Their utility, however, has been limited, particularly in engineering resin applications, because of their relatively low rates of crystallization.
In fact, the unmodified polyether ester comprising polytrimethylene ether terephthalate soft segment and polyethylene terephthalate hard segment is unsuitable for most injection molding applications.
Low crystallization rates cause the polymer to be difficult to pelletize or flake, difficult to spin into fibers, and difficult to process into shaped articles by such methods as thermoforming, injection molding and blow molding, because ejection from the mold of an insufficiently crystallized molding would mean that the article could continue to crystallize when in service with appropriate volume changes.
It is, however, also generally known that a specific additive that works very efficiently for a particular polyester may not work well for others.

Method used

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  • Methods for preparing polyether ester elastomer composition
  • Methods for preparing polyether ester elastomer composition
  • Methods for preparing polyether ester elastomer composition

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0130]This example illustrates the preparation of a polyether ester with the same stoichiometry as that prepared in Comparative Example 1, but in this case including trisodium phosphate nucleating agent.

[0131]A 25 gallon autoclave was charged with 33.2 lbs of dimethyl terephthalate, 30 lbs of PO3G (Mn of 2440), 14 lbs of ethylene glycol, 2 lbs of 1,4-butanediol, 80 g of ETHANOX® 330 antioxidant, 12 g of TYZOR® TPT as catalyst, and 136 g of trisodium phosphate as nucleating agent. The temperature was raised to 215° C., and methanol generated was removed with a nitrogen flush by distillation as a liquid condensate. The temperature was held at 210° C. for about 1.5 hours until no more methanol evolved indicating the end of the trans-esterification reaction.

[0132]The temperature was then raised to 250° C. and held at that temperature at a pressure of 0.3 mm Hg for 2.5 hours. The polymer was extruded into ribbons and converted into flakes.

example 2

[0136]This example illustrates the preparation of a polyether ester with the same stoichiometry as that prepared in Comparative Example 2 but including trisodium phosphate nucleating agent.

[0137]A 250 ml three-necked flask was charged with 42.1 g of dimethyl terephthalate, 29.3 g of PO3G (Mn of 1770), 20 g of ethylene glycol, 0.15 g of IRGANOX® 1098 anti-oxidant, 25 mg of TYZOR® TPT catalyst, and 0.36 g of trisodium phosphate (2100 ppm of sodium based on the final polymer) as nucleating agent. The temperature was raised to 215° C. under nitrogen, and the methanol generated was removed as a liquid condensate by distillation. The temperature was held at 210° C. for about 1.5 hours until no more methanol evolved, indicating the end of transesterification reaction.

[0138]The temperature was raised to 250° C. and held at that temperature at a pressure of 0.2 mm Hg for 2 hours. Then the reaction was stopped by removal of the heat and vacuum, and the polymer was collected.

example 3

[0139]A polyether ester was prepared as described in Example 2 except that the amount of trisodium phosphate used was 0.26 g (corresponding to 1700 ppm of sodium based on the final polymer).

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Abstract

Disclosed are methods for preparing polyether ester elastomer compositions having polytrimethylene ether ester soft segments and polyethylene ester hard segments and containing a nucleating agent. Shaped articles can be made from the elastomer compositions, particularly molded articles, films and fibers.

Description

RELATED APPLICATION[0001]This application is a continuation of, and claims priority to, currently pending U.S. patent application Ser. No. 11 / 590,456, filed on Oct. 31, 2006.FIELD OF THE INVENTION[0002]This invention relates to thermoplastic polyether ester elastomers comprising polytrimethylene ether ester soft segment and polyethylene terephthalate ester hard segment containing nucleating agents, methods for preparing the thermoplastic polyether ester elastomers, and end-uses thereof.BACKGROUND OF THE INVENTION[0003]Thermoplastic elastomers (TPEs) are a class of polymers which combine the properties of two other classes of polymers, namely thermoplastics, which may be reformed upon heating, and elastomers which are rubber-like polymers. One form of TPE is a block copolymer, usually containing some blocks whose polymer properties usually resemble those of thermoplastics, and some blocks whose properties usually resemble those of elastomers. Those blocks whose properties resemble th...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08K3/32C08K5/56
CPCC08G63/672C08J5/18D01F6/86C08K5/098C08K5/0083C08K3/32C08K3/24C08J2367/02C08L67/025C08L67/02B05B7/0483C08K2003/321C08L2203/16
Inventor SUNKARA, HARI BABU
Owner EI DU PONT DE NEMOURS & CO
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