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Processes for producing aliphatic polyester composition, molded object, and aliphatic polyester

A technology of aliphatic polyester and its manufacturing method, applied in the direction of single-component polyester rayon, etc., can solve the problems of inability to manufacture aliphatic polyester composition stably and continuously, and achieve the effect of high conversion rate

Inactive Publication Date: 2017-08-29
KUREHA KAGAKU KOGYO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, aliphatic polyester compositions cannot be produced stably and continuously

Method used

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  • Processes for producing aliphatic polyester composition, molded object, and aliphatic polyester
  • Processes for producing aliphatic polyester composition, molded object, and aliphatic polyester
  • Processes for producing aliphatic polyester composition, molded object, and aliphatic polyester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0105] [Process 1]

[0106] In a drying room controlled to have a dew point of -40° C. or lower, 1.2 kg of glycolide (manufactured by Kureha Co., Ltd.) was placed in a beaker, and the beaker was heated to 100° C. to completely dissolve it. To this glycolide melt, 1.39 g of propylene glycol (manufactured by Junsei Chemical) (0.18 mol% relative to glycolide) and 108 mg of stannous chloride dihydrate (manufactured by Kanto Chemical Co., Ltd.) were added and stirred. After the mixture became completely homogeneous, it was further stirred for 5 minutes. This molten liquid was quickly transferred to an aluminum container, cooled to room temperature and solidified, and then pulverized to a size of about 10 mm. It should be noted that the free acid concentration in the glycolide used is 2eq / t.

[0107] Here, assuming that the free acid of glycolide is glycolic acid, the amount of hydroxyl groups derived from glycolic acid is 0.02 mol% with respect to glycolide. Glycolic acid also f...

Embodiment 2

[0123] As shown in Table 1, in addition to changing the temperature (°C) of the barrel and gear pump to C1 125 / C2 170 / C3 200 / C4215 / GP 240, the temperature is changed from the raw material supply port to the discharge port in four stages. A PGA molded product was obtained by the same method as in Example 1, except that the ground was raised. Table 2 shows the physical properties of the obtained PGA molded product. In addition, no fluctuations in discharge amount and resin pressure were observed in the operation for about 2 hours, and thus it was confirmed that the PGA composition and the molded article were produced stably and continuously.

Embodiment 3

[0125] The PGA molded article obtained in Example 2 was kept for 1 hour in an oven at 170°C blown with dry air having a dew point of -40°C. Table 2 shows the physical properties of the obtained PGA molded product. As shown in Table 2, it was confirmed that the concentration of unreacted glycolide in the obtained PGA molded product (hereinafter referred to as the residual GL concentration) decreased from 1.1% by weight to 0.1% by weight.

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Abstract

A process for continuously producing an aliphatic polyester composition from a cyclic ester, etc. with an extruder in which the internal temperature increases from the feed supply port toward the discharge port in two or more stages and the temperature at the discharge port is a temperature at which the composition at the discharge port has a melt viscosity of 100-2,000 Pa s, the cyclic ester having a free-acid concentration of 10 eq / t or less, and the concentration of the unreacted cyclic ester in the composition being less than 2 wt%.

Description

technical field [0001] The invention relates to an aliphatic polyester composition, a molding and a method for producing aliphatic polyester. Background technique [0002] As a method of continuously producing an aliphatic polyester composition from a cyclic ester, a method is known in which a cyclic ester is melt-kneaded and polymerized in an extruder to obtain an aliphatic polyester composition. [0003] Here, if the cyclic ester is not sufficiently reacted in the extruder, the unreacted cyclic ester contained in the aliphatic polyester composition will increase. As a result, the aliphatic polyester composition cannot be produced stably and continuously. [0004] Patent Document 1 describes a method for polymerizing reabsorbable polyester: a mixture of a cyclic ester, a catalyst and an alcohol is charged from a hopper of an extruder, the temperature inside the extruder is controlled by area, and the reaction mixture is polymerized. The residence time of the reaction mixt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/08C08G63/78C08G63/88C08J7/00
CPCC08G63/08C08G63/78D01F6/62C08G63/85C08J5/00C08J5/18C08J2367/00
Inventor 佐藤浩幸渡边隆宏小林史典
Owner KUREHA KAGAKU KOGYO KK
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