Manufacturing method of liquid crystal resin

A manufacturing method and technology of liquid crystallinity, which are applied in the field of manufacturing liquid crystal resins and can solve the problems of increased gas generation and the like

Active Publication Date: 2022-04-15
POLYPLASTICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, when potassium acetate is used as a catalyst, there is a tendency that the generation of gas during the reaction increases

Method used

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  • Manufacturing method of liquid crystal resin
  • Manufacturing method of liquid crystal resin
  • Manufacturing method of liquid crystal resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] After the following raw materials were charged into the polymerization vessel, the temperature of the reaction system was raised to 140°C, and the reaction was carried out at 140°C for 3 hours (acylation). Then, the temperature was further raised to 360° C. over 4.5 hours, and then the pressure was reduced to 10 Torr (ie, 1330 Pa) over 15 minutes, and polycondensation was performed while leaving acetic acid, excess acetic anhydride, and other low boiling points. The time from the start of decompression until the stirring torque reached the predetermined value was 20 minutes. After the stirring torque reached a predetermined value, nitrogen was introduced, the pressure was increased from the reduced pressure state to the normal pressure state, and the polymer was discharged from the lower part of the polymerization vessel. Then, the strands are pelletized to obtain liquid crystal resin pellets.

[0081] (raw material)

[0082] 4-Hydroxybenzoic acid (HBA): 184 g (60 mol%)...

Embodiment 2

[0089] Furthermore, liquid crystalline resin particles were obtained in the same manner as in Example 1 except that dimethylaminopyridine oxide was added. In addition, the usage-amount of dimethylaminopyridine oxide is as shown in Table 1.

Embodiment 3

[0091] Liquid-crystalline resin particles were obtained in the same manner as in Example 1, except that the B-O bond-containing compound was changed to 3,5-bis(trifluoromethyl)phenylboronic acid. In addition, Table 1 shows the usage-amount of 3,5-bis(trifluoromethyl)phenylboronic acid.

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Abstract

The present invention provides a method for producing a liquid crystalline resin, which comprises reacting raw material monomers including at least one selected from aromatic hydroxycarboxylic acids and polymerizable derivatives thereof to produce a liquid crystalline resin, the liquid crystalline The method for producing the resin includes a step of polycondensing raw material monomers in the presence of an acidic compound having a B-O (boron-oxygen) bond, or a compound capable of generating an acidic compound in a reaction system.

Description

technical field [0001] The present invention relates to a method for producing a liquid crystal resin. Background technique [0002] Liquid crystal resins represented by liquid crystal polyester resins are excellent in high fluidity, low burr properties, and anti-reflux properties, and thus can be widely used in various fields. Such liquid crystal resins are obtained by appropriately combining and selecting raw material monomers such as aromatic hydroxycarboxylic acids, aromatic dicarboxylic acids, aromatic diols, etc. polycondensation. In practice, the polycondensation reaction is usually carried out after acylating a mixture of raw monomers with an acylating agent (acetic anhydride, etc.) in advance. [0003] Various catalysts can be used, for example, in order to increase the speed of the polycondensation reaction at the time of production of the liquid crystalline resin. Among them, when potassium acetate is used as a catalyst, the generation of gas during the reactio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/84C08G63/60C08G69/44
CPCC08G69/44C08G63/84C08G63/60
Inventor 齐藤浩一多田智之
Owner POLYPLASTICS CO LTD
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