Mitsubishi Chemical Corporation

Hisashi Kimura

Naoya Maeda

Michiko Yoshida

Fumio Keitoku

Takeyuki Doi

Toshio Kanbe

Koichi Ikeyama

Koichi Tamura

The present invention provides a method for producing a polyester resin, comprising carrying out a hot-water treatment and a heat treatment, in this order, of polyester prepolymer particles obtained by melt polycondensation of a dicarboxylic acid component and a diol component. The hot-water treatment comprises bringing the polyester prepolymer particles with an intrinsic viscosity of from at least 0.10 dL/g to at most 1.0 dL/g and with a density of at most 1.36 g/cminto contact with hot water at a temperature higher than the glass transition temperature of the polyester prepolymer particles and less than 100&#xb0; C., under the condition satisfying the following formula (1):40&#x2266;()6000&#x2003;&#x2003;(1)

Polyester resin particle and method for producing the same

The present invention relates to a process for producing polyester particles, wherein the process includes: (1) discharging a molten polyester having a melt viscosity of from 0.5 Pa&#xb7;s to 50 Pa&#xb7;s from a die hole thereby creating polyester strands; (2) bringing the polyester strands into contact with a liquefied fluid for cooling to lead the strands to a cutter together with the liquefied fluid; and (3) cutting the polyester strands led to the cutter; wherein steps (1) to (3) are carried out sequentially and the drawing rate ratio of the polyester strands is from 1.5 to 100 and represented by the following formula: drawing rate ratio=(linear velocity of strands immediately before cut (v2 (m/s)))/(linear velocity of molten polyester when discharged from die hole (v1 (m/s))).

Process for production of polyester particles, polyester particles, polyester resin particles, and process for production thereof

A method for producing a copolymerized polyester resin, which comprises subjecting a dicarboxylic acid component containing terephthalic acid or its ester derivative as the main component and a phenylene dioxydiacetic acid as a copolymerizable component, and a diol component containing ethylene glycol as the main component, to polycondensation through an esterification reaction or a transesterification reaction, wherein the phenylene dioxydiacetic acid is added to the reaction system in the form of a solution dissolved in the diol component.

Method for producing a copolymerized polyester resin

The present invention relates to a multilayer polyester sheet comprising:

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Yokkaichi, Japan

Hisashi Kimura