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Polyester resin, molded object thereof, and processes for producing the same

一种制造方法、聚酯树脂的技术，应用在其他家里用具、应用、家里用具等方向，能够解决不能获得高聚合度的聚合物、不能获得高品质的聚合物、没有给出低分子量挥发性物质含量等问题

Inactive Publication Date: 2007-11-07
ASAHI KASEI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to the inventors' studies, polymers with a high degree of polymerization cannot be obtained by applying the above method
When the supply of polymerization intermediates is reduced to improve the polymerization speed, bias flow of polymerization intermediates occurs, and therefore, high-quality polymers cannot be obtained
[0023] Therefore, the conventional gravity drop melt polymerization technology (Patent Documents 9 to 14) cannot provide a method that can replace the solid state polymerization technology and industrially stably produce high-quality polyester resin with a high degree of polymerization with good productivity
Furthermore, these gravity-fall melt polymerization techniques give no indication as to the techniques for obtaining shaped bodies containing low amounts of low-molecular-weight volatile substances such as acetaldehyde

Method used

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  • Polyester resin, molded object thereof, and processes for producing the same
  • Polyester resin, molded object thereof, and processes for producing the same
  • Polyester resin, molded object thereof, and processes for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0420] Hereinafter, examples of a preferred polymerization reactor and a preferred polymerization method used in the present invention will be described with reference to the accompanying drawings.

[0421] Fig. 1 shows a specific example of a polymerization reactor suitable for producing the polyester resin of the present invention. Polymerization intermediates of polyester resin are supplied from raw material supply port 2 to polymerization reactor 10 by delivery pump 1 , introduced into the polymerization reactor through perforated plate 3 and dropped along support 5 . The inside of the polymerization reactor is adjusted to a predetermined degree of reduced pressure. EG generated from the polymerization intermediate as a by-product, and an inert gas such as nitrogen introduced from the inert gas supply port 6 if necessary, are exhausted from the decompression exhaust port 7 . The highly polymerized polyester resin was discharged from a discharge port 9 using a discharge pu...

Embodiment 1

[0506] Using the apparatus shown in FIG. 3 and high-purity terephthalic acid and EG as raw materials, PET resin was polymerized by a continuous polymerization method at an average rate of 2.4 kg per hour. Use the vertical stirring polymerization reactor that has paddle shape stirring blade (P2, P6, P10) as esterification reactor (P1) and the first stirring tank type polymerization reactor (P5) and the second stirring tank type polymerization reactor (P9 ), polymerized under reduced pressure in the final polymerization reactor (10) by allowing the material to drain from the holes on the perforated plate (3) and let it fall along the support (5). Under the conditions shown in Table 1 and Table 3, polymerization was performed by continuously feeding a slurry-like mixture of 1:1.2 (molar ratio) terephthalic acid and EG to the esterification reactor. The structure of Support 1 used here is as described in Table 9.

[0507] In this operation, 0.04% by weight of antimony trioxide an...

Embodiment 2

[0516] By following the same method as in Example 1, the PET resin was polymerized by a continuous polymerization method at an average rate of 5.5 kg per hour under the conditions shown in Table 1 and Table 4.

[0517]The perforated plate (3) is 50 mm thick, and the diameter of the holes is 1 mm. They are linearly arranged in two parallel rows with an interval of 10 mm, each row has 7 holes, and the row spacing is 70 mm.

[0518] The support (5) (support 2 in Table 9) is made of 2mm diameter and 8m long wires, each wire is hung vertically and placed near each hole, and the 2mm diameter and 100mm long wires are separated by 100mm intervals. Cross the upper group of seven wires at right angles to form a metal mesh. Two pieces of this metal mesh were used (Table 9).

[0519] The properties of the polymerization intermediates are shown in Table 1 and Table 4. 10 kg of polymerized pellets were put into a vat and heat-treated in a hot air dryer at 130° C. for 10 hours, and then th...

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Abstract

The present invention relates to a polyester resin, molded object thereof, and processes for producing the same. The invention provides polyethylene terephthalate resin which is obtained by melt polymerization at a reduced pressure or in an inert gas atmosphere and has the following properties (A) to (F): (A) the intrinsic viscosity [eta] is 0.4-2.5 dL / g; (B) the content of carboxy groups present at polymer ends is 30 meq / kg or lower; (C) the acetaldehyde content is 10 ppm or lower; (D) a hexafluoroisopropanol solution of the resin, when analyzed by the transmission method, has a hue which has an L value of 99 or larger and a b value of 0.4 or smaller; (E) the Mw / Mn is 1.8-2.3; and (F)the cyclic trimer content is 5 wt.% or lower.

Description

technical field [0001] The present invention relates to polyester resins (especially polyethylene terephthalate resins) and polyester resin pellets and preforms and hollow bodies formed by molding the above-mentioned high-quality polyester resins, the polyester resins It has a degree of polymerization ranging from a low degree of polymerization to a high degree of polymerization, the content of carboxyl groups at the end of the polymer and the content of impurities such as acetaldehyde are small, the amount of aldehydes produced during processing is small, it has a good hue and a narrow molecular weight distribution And excellent moldability, high quality; the polyester resin pellets have low micronized powder content, have good handling characteristics and make the molded body have good quality. Background technique [0002] Polyester resins represented by polyethylene terephthalate resins (hereinafter simply referred to as “PET resins” in some cases) have properties such a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/183B29C49/02C08G63/78B29K67/00B29L22/00
CPCC08G63/80B29B2911/14026B29B2911/14133B29K2105/253B29C49/12B29K2067/00B29B2911/1402C08G63/785B29B2911/14106B29C49/06Y10T428/1352B29B2911/14213B29B2911/1404B29C31/04B29C2045/1883B29B2911/14033B29C49/0005Y10T428/2982B29C45/18B29C2949/3024B29C2949/28B29C2949/26B29C2949/24B29C2949/22B29C2949/3056B29C2949/3032B29C2949/0715B29C49/087B29C2049/7879C08G63/183C08G63/85
Inventor 横山宏冈本裕重網中宗明
Owner ASAHI KASEI CHEM CORP
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