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Ethylene terephthalate polyester resin for forming container, and method for producing same

A technology of ethylene terephthalate and polyester resin, applied in the field of ethylene terephthalate polyester resin for container molding and its production, which can solve the problem of frequent cleaning of metal molds and damage to container flavor retention , whitening of molded products, etc., to achieve excellent flavor retention, excellent meltability, and the effect of inhibiting the formation of acetaldehyde

Active Publication Date: 2014-03-19
TOYO SEIKAN GRP HLDG LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, particles of homopolyethylene terephthalate with a high intrinsic viscosity also have high crystallinity and are therefore not easily melted
Therefore, there arises a problem that if a large shearing force is applied at the time of melt molding, the molding machine is generally subjected to overshooting, and a low-melting oligomer component is formed due to deterioration of the resin due to heat generated by the shearing force Such as monohydroxyethyl terephthalate (hereinafter generally referred to as MHET) or bishydroxyethyl terephthalate (hereinafter generally referred to as BHET), cyclic oligomer components such as cyclic trimers and volatile Reactive low-molecular-weight components such as acetaldehyde, and unmelted components remaining in the molten resin act as crystal nucleating agents causing whitening of molded products
In addition, when heat-fixing is performed to impart heat resistance to the container, the ring-shaped trimer attached to the surface of the metal mold via MHET or BHET becomes a transfer of unevenness to the surface of the container, resulting in problems such as decreased transparency and frequent cleaning of the metal mold, etc. cause of the problem
In addition, the formation of large amounts of acetaldehyde can destroy the flavor retention of the container

Method used

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  • Ethylene terephthalate polyester resin for forming container, and method for producing same
  • Ethylene terephthalate polyester resin for forming container, and method for producing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0111]A solid phase having an intrinsic viscosity of 0.84 dl / g, comprising a copolymerization component (diethylene glycol) other than ethylene glycol and terephthalic acid in an amount of 1.28 mol%, and comprising MHET and BHET in a total amount of 0.0038% by weight Pellets of the polymerized PET resin were melt-extruded, pelletized again, and thereafter subjected to crystallization treatment and heat treatment by a nitrogen flow method. Heat treatment conditions include 180° C. for 4 hours. After the heat treatment, the intrinsic viscosity, the total amount of MHET and BHET, the heat of fusion and the degree of crystallinity of the particles were measured. Preforms were prepared from the heat-treated PET resin pellets, and their intrinsic viscosity, the total amount of MHET and BHET, and the amount of acetaldehyde were measured. By using the preform thus prepared, heat setting was tested, and contamination on the surface of the metal mold was visually evaluated. The bottle...

Embodiment 2

[0113] The pellets were melt-extruded, heat-treated, and a preform was prepared therefrom in the same manner as in Example 1 except for heat treatment by a reduced pressure method. After the measurements of the granules and preforms had been made, heat setting was tested and the contamination on the metal mold surface was evaluated visually. The bottles were also evaluated for flavor retention and stretch formability.

Embodiment 3

[0115] In addition to using a solid having an intrinsic viscosity of 0.81 dl / g, containing a copolymerization component (diethylene glycol) other than ethylene glycol and terephthalic acid in an amount of 1.42 mol%, and containing MHET and BHET in a total amount of 0.0042% by weight Except for the phase-polymerized PET resin pellets, the pellets were melt-extruded and heat-treated in the same manner as in Example 1, and a preform was prepared therefrom. After the measurements of the granules and preforms had been made, heat setting was tested and the contamination on the metal mold surface was evaluated visually. The bottles were also evaluated for flavor retention and stretch formability.

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Abstract

This ethylene terephthalate polyester resin for forming a container has an intrinsic viscosity within the range from 0.80 dL / g to 0.90 dL / g, a content of copolymer components other than ethylene glycol and terephthalic acid of less than 1.5% by mole, a total content of monohydroxyethyl terephthalate and bishydroxyethyl terephthalate of less than 0.005% by weight, a melting enthalpy of 50 J / g or less, and a crystallinity of less than 60%. Consequently, this ethylene terephthalate polyester resin for forming a container has high intrinsic viscosity and excellent stretch moldability, while having excellent fusibility.

Description

technical field [0001] The invention relates to an ethylene terephthalate polyester resin for container molding and a production method thereof. More specifically, the present invention relates to an ethylene terephthalate-based polyester resin for container molding, which has a high intrinsic viscosity, contains a low molecular weight component in a reduced amount, is excellent in melting and makes a The container to be stretch-blow molded can remain stable. Background technique [0002] Containers obtained by stretch-molding thermoplastic polyester resins such as polyethylene terephthalate have excellent transparency and surface gloss, have impact resistance, rigidity, and gas barrier properties required for containers such as cups, and have been used in As a container for various beverages and food. [0003] Among polyester resins, homopolyethylene terephthalate has a higher degree of crystallinity than polyethylene terephthalate-based polyester resins containing copoly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/183B65D1/00C08G63/88
CPCB65D1/40C08G63/183C08G63/88Y10T428/1397B65D1/00C08L67/03
Inventor 中村和彦山田俊树
Owner TOYO SEIKAN GRP HLDG LTD