Polyester resins, molded articles, preforms, polyester bottles, and mechanically recycled polyester resins

JP7900351B2Active Publication Date: 2026-08-04TOYO SEIKAN GRP HLDG LTD +1
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
TOYO SEIKAN GRP HLDG LTD
Filing Date
2023-11-22
Publication Date
2026-08-04

AI Technical Summary

Benefits of technology

【0013】 本発明によれば、成形時の金型汚れの発生を抑制することができるポリエステル樹脂を提供することができる。

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Abstract

To provide a polyester resin capable of suppressing occurrence of staining of a mold during molding.SOLUTION: A polyester resin contains polyester containing a diol unit and a dicarboxylic acid unit as a main component, wherein the polyester resin contains cyclic oligomer containing the diol unit and the dicarboxylic acid unit, and a ratio (C5 / CT) of a peak area of a pentamer oligomer (C5) to a peak area of a trimer oligomer (CT) in the cyclic oligomer measured using liquid chromatography is 0.086 or more.SELECTED DRAWING: None
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Claims

1. A polyester resin containing diol units and dicarboxylic acid units, and containing 70 mol% or more of ethylene terephthalate units, The polyester resin comprises a cyclic oligomer containing the diol unit and the dicarboxylic acid unit, A polyester resin characterized in that the ratio of the peak area of ​​the pentamer oligomer (C5) to the peak area of ​​the trimer oligomer (CT) in the cyclic oligomer (C5 / CT), as measured by liquid chromatography, is 0.091 or more and 0.131 or less.

2. The polyester resin according to claim 1, characterized in that the ratio of the peak area of ​​the hexamer oligomer (C6) to the peak area of ​​the trimer oligomer (CT) in the cyclic oligomer (C6 / CT), as measured by liquid chromatography, is 0.058 or more.

3. The polyester resin according to claim 1, characterized in that the ratio of the peak area of ​​the heptamer oligomer (C7) to the peak area of ​​the trimer oligomer (CT) in the cyclic oligomer (C7 / CT), as measured by liquid chromatography, is 0.031 or more.

4. A molded article made from the polyester resin described in any one of claims 1 to 3.

5. A preform made from a polyester resin according to any one of claims 1 to 3.

6. A polyester bottle made from the polyester resin described in any one of claims 1 to 3.

7. The polyester resin according to any one of claims 1 to 3, characterized in that the polyester resin is a mechanically recycled polyester resin.

8. A method for producing a polyester resin according to any one of claims 1 to 3, A method for producing a polyester resin comprising a first melt extrusion step, a second melt extrusion step, a crystallization step, and a solid-phase polymerization step, in which a polyester containing the diol units and the dicarboxylic acid units and containing 70 mol% or more of the ethylene terephthalate units is subjected to thermal history control treatment.

9. A method for producing a polyester resin according to claim 8, A method for producing polyester resin, comprising performing the aforementioned thermal history control treatment four to nine times.

10. A method for producing a polyester resin according to claim 8, A method for producing a polyester resin, using a polyester having an intrinsic viscosity of 0.70 or higher.