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Method for producing polymer

A manufacturing method and polymer technology, applied in the field of polymer manufacturing, can solve the problems of impracticality, uneven reaction, inability to obtain polymers, etc., and achieve the effect of reducing the reaction time

Active Publication Date: 2014-05-28
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is impractical because of the long polymerization time (which is 16 hours) and the number average molecular weight of the polymer produced is only available up to about 10,000
Furthermore, according to this method, high molecular weight polymers cannot be easily obtained because the reaction proceeds locally
Since the reaction does not proceed uniformly in this method, it may not be possible to obtain the desired properties of the polymer when synthesizing the L- and D-racemates or performing a copolymerization reaction with other components

Method used

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  • Method for producing polymer
  • Method for producing polymer
  • Method for producing polymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0206] 90 parts by mass of L-lactide lactide, 10 parts by mass of D-lactide lactide, and lauryl alcohol serving as an initiator in an amount of 1.00 mol % relative to 100 mol % of monomers were charged into a 100 mL pressure vessel 27 , It has been weighed so that the mass of the whole system becomes 50 g. The resulting mixture was heated to 110° C. and melted at 110° C., followed by charging supercritical carbon dioxide (60° C., 15 MPa) into a pressure vessel 27 by means of a pump 22 . The mixture was then allowed to melt for 10 minutes with stirring. Here, the internal system temperature was controlled to 60°C. Note that the ratio of raw materials including monomers, initiators, etc. to carbon dioxide used as compressive fluid is 1.26 because the specific gravity of raw materials in this system is 1.25, and the specific gravity of compressive fluid at 60° C. and 15 MPa is 0.65.

[0207] Next, the path of the compressive fluid is switched to a path passing through the feedi...

Embodiment 1-2 to 1-4

[0209] In Examples 1-2 to 1-4, polymers were produced in the same manner as in Example 1-1, except that the amount of the initiator was changed as shown in Table 1. The physical properties of the obtained polymers were measured in the manner described above. The results are shown in Table 1.

Embodiment 1-5 to 1-7

[0211] In Examples 1-5 to 1-7, polymers were produced in the same manner as in Example 1-1, provided that the reaction temperature was changed as shown in Table 2. The physical properties of the obtained polymers were measured in the manner described above. The results are shown in Table 2.

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Abstract

To provide a method for producing a polymer, which contains: bringing a compressive fluid and a ring-opening polymerizable monomer into contact with each other, followed by adding a catalyst thereto, to thereby allow the ring-opening polymerizable monomer to carry out ring-opening polymerization.

Description

technical field [0001] The present invention relates to a process for producing polymers by ring-opening polymerization of ring-opening polymerizable monomers. Background technique [0002] Conventionally known polymer production methods involve ring-opening polymerization of ring-opening polymerizable monomers such as lactide and ε-caprolactone to produce polymers. For example, polylactic acid, which has been known as a biodegradable plastic, is produced by adding tin octoate as an example of a metal catalyst to lactide of lactic acid, and in an inert gas atmosphere, under atmospheric pressure or reduced pressure, Lactide is melt polymerized at about 200°C. [0003] When the polymer is produced by the above method, not only a large amount of energy is consumed, but also a large amount of residue remains because the melt polymerization is performed at a high temperature. [0004] When polylactic acid is produced by melt polymerization at a high temperature of about 200° C....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/81C08G63/82
CPCC08G63/78C08G63/823C08G63/87C08G64/30
Inventor 根本太一田中千秋山内祥敬
Owner RICOH KK