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Polyethylene terephthalate for molding and process for producing the same

一种聚对苯二甲酸乙二醇酯、对苯二甲酸酯的技术，应用在成形用聚对苯二甲酸乙二醇酯的制造领域，达到含量少的效果

Inactive Publication Date: 2006-01-18
PET REBIRTH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this gazette, there is nothing about the content of the cyclic trimer when the temperature of the polymer is controlled at 290°C.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0109] Condensation process

[0110] Mix 64.9 kg of high-purity bis(2-hydroxyethyl)terephthalate (BHET) with an acid value of 0.9 mgKOH / g, an optical density of 0.002, an ion content of 0.5 ppm, and a purity of 99.0% by weight and 0.9 kg of phthalic acid (IPA), BHET (acid value 9.1 mgKOH / g, optical density 0.002, ion content 0.6 ppm, purity 97.6% by weight) was prepared as a starting material, and charged into a reaction device. 12.0g of antimony trioxide, 2.1g of cobalt acetate and 6.8g of trimethyl phosphate are then charged into the reaction device, and after nitrogen replacement in the system, the internal pressure is decompressed to 15kPa with a vacuum pump. The internal temperature was raised from 120° C. to 235° C., and oligomerization was carried out over 60 minutes while distilling off by-produced ethylene glycol (EG). The average degree of polymerization of the obtained oligomers was about 5.

[0111] Melt Polymerization Process

[0112] Next, this oligomer was tr...

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Abstract

The aim of the invention is to provide a method for producing a polyethylene terephthalate for molding which has a low content of cyclic trimer. The present invention is a method for producing a polyethylene terephthalate for molding which comprises (1) a condensation step of condensing bis(2-hydroxyethyl)terephthalate having an ion content of 10 ppm or less and an acid value of 30 mgKOH / g or less to produce an oligomer having an average polymerization degree of 4 to 10, (2) a melt-polymerization step of melt-polymerizing the oligomer to produce a prepolymer having an intrinsic viscosity of 0.50 to 0.65, and (3) a solid-state polymerization step of crystallizing pellets of the prepolymer and then solid-state polymerizing the prepolymer at a temperature of 190 to 230 DEG C to produce a polyethylene terephthalate having an intrinsic viscosity of not lower than 0.65; and a polyethylene terephthalate for molding which is obtained by the method and has specific properties.

Description

technical field [0001] The present invention relates to a method for producing polyethylene terephthalate for molding, and in more detail, relates to bis(2-hydroxyethyl) terephthalate as a starting material, cyclic trimer content A method for producing polyethylene terephthalate for low molding. In addition, the present invention relates to polyethylene terephthalate for molding. Background technique [0002] Polyethylene terephthalate (hereinafter, often abbreviated as PET) has excellent physical and chemical properties, so it is mass-produced as a raw material for various applications such as fibers, films (including sheets), containers, and electrical components. , and are used in a wide range of applications. In particular, for bottles, the need is rapidly expanding. [0003] In short, although it is PET, the required properties vary depending on the application. For example, PET for bottles requires a higher degree of polymerization than PET for clothing fibers and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/80C08G63/183
CPCC08G63/80C08G63/183Y02P20/582
Inventor 稻田修司佐藤菊智
Owner PET REBIRTH CO LTD