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Liquid crystal polyester powder and method for producing liquid crystal polyester solution composition

A technology of liquid crystal polyester and powder, which is applied in the field of manufacture of liquid crystal polyester powder and liquid crystal polyester solution composition, can solve the problems of easy reduction of mechanical strength and the like

Pending Publication Date: 2022-05-17
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, since the liquid crystal polyester film is significantly oriented in the extrusion direction, the anisotropy in the transverse direction (direction perpendicular to the extrusion direction) is greater than the anisotropy in the longitudinal direction (extrusion direction), and the mechanical strength tends to decrease.

Method used

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  • Liquid crystal polyester powder and method for producing liquid crystal polyester solution composition
  • Liquid crystal polyester powder and method for producing liquid crystal polyester solution composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0162] (Examples 1 to 4, Comparative Example 1)

[0163] Add 940.9 g (5.0 moles) of 6-hydroxyl-2-naphthoic acid, 377.9 g (2.5 moles) of acetaminophen, m 415.3g (2.5 moles) of phthalic acid and 867.8g (8.4 moles) of acetic anhydride, after replacing the gas in the reactor with nitrogen, it took 60 minutes to raise the temperature from room temperature to 140°C while stirring under nitrogen flow, and at 140 °C for 3 hours at reflux. Next, while distilling off by-produced acetic acid and unreacted acetic anhydride, the temperature was raised from 140°C to 300°C over 5 hours and kept at 300°C for 30 minutes, and then the contents were taken out from the reactor and cooled to room temperature to obtain solid matter.

[0164] The obtained solid matter was pulverized using a pulverizer manufactured by ORIENT (model: VM-16, rotation speed: 1500 rpm) to obtain a powdery liquid crystal polyester (A0). The flow initiation temperature of this liquid crystal polyester (A0) was 193.3°C. ...

Embodiment 1

[0183] Example 1: 0.1106.

Embodiment 2

[0184] Example 2: 0.0897.

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Abstract

Provided are: a liquid crystal polyester solution composition in which the solution viscosity is suppressed in accordance with the flow initiation temperature of a liquid crystal polyester powder; and a liquid crystal polyester powder useful for the liquid crystal polyester solution composition. The liquid crystal polyester powder is soluble in an aprotic solvent, and is characterized in that the proportion of particles having a particle diameter of less than 250 [mu] m as measured by a dry screening test method in JIS K 0069 (1992) is 23.5 mass% or less. Furthermore, the present invention uses a method for producing a liquid crystal polyester solution composition in which the liquid crystal polyester powder is dissolved in an aprotic solvent to obtain a liquid crystal polyester solution composition.

Description

technical field [0001] The invention relates to a method for manufacturing liquid crystal polyester powder and liquid crystal polyester solution composition. [0002] This application claims priority based on Japanese Patent Application No. 2019-198458 filed in Japan on October 31, 2019, and its content is incorporated into this application. Background technique [0003] The liquid crystal polyester is produced by melt polymerizing raw material monomers corresponding to repeating units (structural units) constituting the liquid crystal polyester, and solid state polymerizing the obtained polymer (prepolymer). The liquid crystal polyester produced in this way is widely used as an electronic substrate material because it exhibits excellent high-frequency characteristics and low hygroscopicity. [0004] In recent years, attention has been paid to the application of a liquid crystal polyester film produced by extrusion molding using this liquid crystal polyester as an insulatin...

Claims

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Application Information

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IPC IPC(8): C08G69/44
CPCC08G69/44C08J3/096C08G63/6852C08J2367/03C08J3/02A61K9/1647A61K9/1694A61K31/167
Inventor 莇昌平伊藤豊诚
Owner SUMITOMO CHEM CO LTD