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Wholly aromatic liquid crystal polyester resin and production method therefor

A liquid crystal polyester and wholly aromatic technology, which is applied in the field of wholly aromatic liquid crystal polyester resin and its manufacturing, can solve the problems of physical property reduction such as mechanical strength, warping, and surface swelling of molded products, so as to achieve high mechanical strength and prevent warping effect

Active Publication Date: 2018-09-28
JXTJ NIPPON OIL & ENERGY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, lowering the molecular weight of the liquid crystal polymer not only reduces the physical properties such as the mechanical strength of the molded product, but also has the following problem: the reflow process performed when the molded product is applied to electronic devices such as connectors causes swelling on the surface of the molded product ( blistering), warping

Method used

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  • Wholly aromatic liquid crystal polyester resin and production method therefor
  • Wholly aromatic liquid crystal polyester resin and production method therefor
  • Wholly aromatic liquid crystal polyester resin and production method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0126] (Example 1: Whole aromatic liquid crystal polyester resin A)

[0127] In a polymerization vessel with stirring blades, add p-hydroxybenzoic acid (HBA) 24.9g (30 mol%), 6-hydroxy-2-naphthoic acid (HNA) 11.3g (10 mol%), hydroquinone (HQ) 15.9 g (24 mol%), 4,4-dihydroxybiphenyl (BP) 6.7g (6 mol%), terephthalic acid (TPA) 29.9g (30 mol%), potassium acetate and acetic acid loaded as catalyst Magnesium, decompression-nitrogen injection of the polymerization container was performed three times, and after nitrogen substitution, 66.2 g of acetic anhydride (1.08 molar equivalent to the hydroxyl group) was further added, and the temperature was raised to 150° C., and reflux was carried out for 2 hours. Acetylation reaction.

[0128]After the acetylation was completed, the temperature of the polymerization vessel in which acetic acid was distilled was raised at 0.5°C / min, and when the temperature of the melt in the tank reached 310°C, the polymer was drawn out and cooled to solidi...

Embodiment 2

[0130] (Example 2: Whole aromatic liquid crystal polyester resin B)

[0131] The liquid crystal polyester resin B was obtained in the same manner as in Example 1 except that the monomer feed was changed to HBA 30 mol%, HNA 15 mol%, HQ 26 mol%, BP 1.5 mol%, and TPA 27.5 mol%. Liquid crystallinity was confirmed in the same manner as above.

Embodiment 3

[0132] (Example 3: Whole aromatic liquid crystal polyester resin C)

[0133] Except that the monomer feed was changed to 30 mol% of HBA, 10 mol% of HNA, 21 mol% of HQ, 9 mol% of BP, and 30 mol% of TPA, a liquid crystal polyester resin C was obtained in the same manner as in Example 1, and Liquid crystallinity was confirmed in the same manner as above.

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Abstract

To provide a wholly aromatic liquid crystal polyester resin having high mechanical strength, excellent filling properties, blister resistance, and low warpage. This wholly aromatic liquid crystal polyester resin includes structural units (I) to (V), which are represented by formulas (I) to (V), and is characterized in that: the composition ratios (mol%) of the structural units (I) to (V) therein are 15 mol% <= structural unit (I) <= 35 mol%, 5 mol% <= structural unit (II) <= 15 mol%, 21 mol% <= structural unit (III) <= 29 mol%, 1 mol% <= structural unit (IV) <= 9 mol%, and 25 mol% <= structural unit (V) <= 40 mol%, wherein the structural units (I) to (V) total 100 mol%; and the melting point is at least 320 DEG C.

Description

technical field [0001] The present invention relates to a wholly aromatic liquid crystal polyester resin and a manufacturing method thereof. Furthermore, the present invention relates to a wholly aromatic liquid crystal polyester resin composition comprising the wholly aromatic liquid crystal polyester resin, a molded article and an electronic device comprising the composition. Background technique [0002] Since wholly aromatic liquid crystal polyester resins are excellent in moldability, heat resistance, and filling properties, molded articles (such as injection molded articles) produced using them have been used in various electronic devices. [0003] In recent years, due to the miniaturization of personal computers and smartphones, and the development of high integration, thinner wall thickness, and thinner electronic devices, the demand for molded products with very thin wall thickness parts has increased. Therefore, wholly aromatic liquid crystal polyester resins are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/60C08G63/79C08K3/013C08K7/04C08L67/04
CPCC08G63/60C08G63/79C08K3/00C08K7/04C08L67/04
Inventor 秋山希望川村亮人安藤正寿
Owner JXTJ NIPPON OIL & ENERGY CORP
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