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Process for producing polyhydroxy polyester

A technology for polyhydroxy polyester and its manufacturing method, which is applied in the field of polyhydroxy polyester manufacture, can solve the problems of reducing environmental load and effective utilization of straight-chain polyester that have not yet been reported, and achieves reducing environmental load, suppressing poor forming, The effect of efficient manufacturing

Active Publication Date: 2013-06-12
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, it has not been reported that the effective utilization of linear polyesters that can realize by-products, especially the polyhydroxy polyesters that do not contain polyesters having carboxyl groups at the terminals by forming them into polyhydroxy polyesters, and reduce the environmental load has not been reported. Manufacturing method

Method used

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  • Process for producing polyhydroxy polyester
  • Process for producing polyhydroxy polyester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 7 g of sorbitol was added to 200 g of polylactic acid (Unitaka Co., Ltd., TE-4000), and the mixture was heated and melted at 200°C for 4 hours under a nitrogen atmosphere to obtain a crude polyhydroxy polyester (P) (Comparative Example 1) . The molecular weight and carboxyl group concentration of the polyhydroxy polyester in this reaction change with time as figure 1 Shown. As the reaction progressed, the carboxyl groups increased, reaching 88 μmol / g.

[0042] P (10g) was melted at 200°C, 2.3% by mass of polycarbodiimide A (Nisshinbo Co., Ltd. V-05, carbodiimide equivalent: 261g / mol) was added to it, and then heated and mixed for 1 hour . The molecular weight and carboxyl group concentration of the obtained polyhydroxy polyester are shown in Table 1.

[0043] The molecular weight is measured by GPC (10A-VP, manufactured by Shimadzu Corporation).

[0044] The carboxyl group concentration was determined by dissolving a sample (100 mg) in a mixed solvent of chloroform (20 ml...

Embodiment 2

[0046] P (10g) was melted at 200°C, 5.0% by mass of polycarbodiimide B (V-02B, Nisshinbo Co., Ltd., carbodiimide equivalent 603 g / mol) was added thereto, and then heated and mixed for 1 hour . In the same manner as in Example 1, the molecular weight and carboxyl group concentration of the obtained polyhydroxy polyester were measured. The results are shown in Table 1.

Embodiment 3

[0048] P (10g) was melted at 200°C, 2.1% by mass of polycarbodiimide C (LA-1, Nisshinbo Co., Ltd., carbodiimide equivalent 247g / mol) was added thereto, and the mixture was heated and mixed for 1 hour . In the same manner as in Example 1, the molecular weight and carboxyl group concentration of the obtained polyhydroxy polyester were measured. The results are shown in Table 1.

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Abstract

A process for producing a polyhydroxy polyester which, when molded into a molded object, can be inhibited from causing the molding failure which occurs due to carbon dioxide generation attributable to terminal carboxy groups.  The process needs no by-product removal step and hence needs none of a solvent, a recovery device, and the like.  The process can efficiently yield the polyester while attaining a reduction in environmental burden.  In particular, a linear polyester as a by-product is used to form a radial polyhydroxy polyester, whereby the by-product is effectively utilized.  The polyhydroxy polyester is hence produced in satisfactory yield.  A nucleus-forming polyhydroxy compound having two or more hydroxy groups and an oxy acid are used to grow a polyester and thereby obtain a polyhydroxy polyester and, as a by-product, a linear polyester having a carboxy group at an end.  A carboxy-blocking agent is then added to the reaction system to bond the carboxy-blocking agent to the terminal carboxy group of the linear polyester.

Description

Technical field [0001] The present invention relates to a method for producing polyhydroxy polyester. More specifically, it relates to a linear polyester that does not need to be removed as a by-product having a carboxyl group at the terminal, and can suppress the generation of carbon dioxide caused by the terminal carboxyl group, thereby reducing the environmental load. A manufacturing method of polyhydroxy polyester that can be manufactured efficiently. Background technique [0002] Macromolecules with radial molecular structures are called star polymers or hyperbranched polymers. They have different viscosity behavior and physical properties from linear polymers, so they have become a material that has attracted much attention. The polyhydroxy polyester known as such a polymer with a radial molecular structure can also be used as a precursor of a three-dimensional crosslinked structure resin. If it is crosslinked with an appropriate crosslinking agent (Rinka one), thermosettin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/78C08G63/91
CPCC08G63/06
Inventor 井上和彦志村绿
Owner NEC CORP
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