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Polytrimethylene terephthalate

A technology of polytrimethylene terephthalate and polytrimethylene phthalate, which is applied in the field of polytrimethylene terephthalate and fibers containing the compound, and can solve problems such as inability to obtain fundamental improvement

Inactive Publication Date: 2007-06-20
SOLOTEX CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using this method, although the amount of cyclic dimer in the raw material sheet of polytrimethylene terephthalate can be reduced, the cyclic dimer is regenerated during molding and remelting, so fundamental improvement cannot be obtained.

Method used

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  • Polytrimethylene terephthalate
  • Polytrimethylene terephthalate
  • Polytrimethylene terephthalate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0114] 100 parts by weight of dimethyl terephthalate and 70.5 parts by weight of 1,3-propanediol are mixed, and the mixture and 0.053 parts by weight of tetra-n-butyl titanate are charged into a device equipped with a stirrer, a rectifying tower and methanol to distill and condense in the reactor. The temperature of the reactor was gradually raised from 140° C., and the transesterification reaction was carried out while distilling off the methanol produced by the reaction to the outside of the system. Three hours after the start of the reaction, the internal temperature of the reactor reached 210°C.

[0115] Then, the resulting reaction product was transferred to a reaction vessel provided with a stirrer and a glycol distillation condenser, and the internal temperature of the reactor was slowly raised from 210°C to 265°C, while the pressure was dropped from normal pressure to 70Pa. High vacuum for polymerization. Monitor the melt viscosity in the reactor at any time, and sto...

Embodiment 2

[0122] In Example 1, without adding CDHMP, melt polymerization and solid state polymerization were performed to obtain a sheet with an intrinsic viscosity of 0.98 dL / g. Using a twin-screw extruder, this sheet was remelted at 260° C., and the content of CDHMP was adjusted to 0.1% by weight while adding it from a side feed hole. Then, it was cut using a strand cutter to obtain a sheet with an intrinsic viscosity of 0.93 dL / g. The obtained sheet was made into fibers in the same manner as in Example 1. The evaluation results are shown in Tables 1 and 2.

Embodiment 3

[0124] In Example 1, without adding CDHMP, melt polymerization and solid state polymerization were performed to obtain a sheet with an intrinsic viscosity of 0.93 dL / g. A 5% by weight methylene chloride solution of 21.2 parts by weight of CDHMP was uniformly poured into 100 parts by weight of the obtained sheet, and dried at normal temperature under a nitrogen stream. The obtained sheet was made into fibers in the same manner as in Example 1. The evaluation results are shown in Tables 1 and 2.

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Abstract

A polytrimethylene terephthalate which is reduced in cyclic dimer content and is less apt to generate cyclic dimmers during melt molding. The polytrimethylene terephthalate (A) consists mainly of trimethylene terephthalate units, has an intrinsic viscosity of 0.5-1.6 dL / g, and contains 0.01-0.5 wt.% compound represented by the following formula (I) or (II): (wherein R1, R2, and R3 are the same or different and each is a C1-10 hydrocarbon group; n is an integer of 1-5; and M is an alkali metal or alkaline earth metal, provided that when M is an alkali metal, then m is 1 and when M is an alkaline earth metal, then m is 2) (wherein R4 and R5 are the same or different and each is hydrogen or a C1-10 hydrocarbon group).

Description

technical field [0001] The present invention relates to poly(trimethylene terephthalate) and fibers containing the compound. More specifically, the present invention relates to poly(trimethylene terephthalate) which generates less cyclic dimer during melt molding, and fibers containing the compound. Background technique [0002] Polyester has excellent mechanical, physical, and chemical properties, so it is widely used in fibers, films, and other moldings. In recent years, polytrimethylene terephthalate fibers have attracted attention due to their soft style, excellent elastic recovery, and easy dyeing properties that polyethylene terephthalate fibers do not have. [0003] However, this polytrimethylene terephthalate tends to form a cyclic dimer during polycondensation. This cyclic dimer adheres to the vicinity of the spinneret as an impurity in the spinning step, causing filament breakage. In addition, during processing such as weaving and braiding, cyclic dimers are pre...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08G63/84C08K5/49D01F6/62D01F6/92
Inventor 塚本亮二桥本典子星丰彦
Owner SOLOTEX CORP
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