Liquid-crystalline polyester resin composition and connector using the same

一种树脂组合物、液晶聚酯的技术，应用在液晶材料、化学仪器和方法、底座/外壳等方向，达到工业价值大的效果

Active Publication Date: 2010-11-03
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the production of connectors with more complex shapes, more satisfactory melt flowability of the molding material is required due to further thinning and the occurrence of warpage in the resulting connectors is further suppressed

Method used

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  • Liquid-crystalline polyester resin composition and connector using the same
  • Liquid-crystalline polyester resin composition and connector using the same
  • Liquid-crystalline polyester resin composition and connector using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0101] The present invention is illustrated in more detail by means of the following examples, which should not be construed as limiting the scope of the invention.

[0102] The physical properties of mica were measured by methods (1) to (3) shown below, and the prepared liquid crystal polyester resin compositions were evaluated by methods (4) to (6).

[0103] (1) Volume average particle size

[0104] The volume average particle diameter is measured using a master sizer (SYSMEX CORPORATION).

[0105] (2) specific surface area

[0106] The specific surface area was measured using Hmmodel-1208 (Mountech).

[0107] (3) viscous water

[0108] The amount of viscosified water was measured using a heat-dry type moisture meter (A&D Company, Limited).

[0109] (4) Thin wall flow length (melt fluidity)

[0110] Use the installed figure 2 Injection molding machine ("PS10E1ASE" manufactured by Nissei Plastic Industrial Co., Ltd.) of the indicated mold (0.3mmt) at a barrel temperatu...

manufacture Embodiment 1

[0116] In a reactor equipped with a stirrer, torque meter, nitrogen conduit, thermometer and reflux condenser, 994.5 g (7.2 mol) of p-hydroxybenzoic acid, 299.0 g (1.8 mol) of terephthalic acid, 99.7 g (0.6 mol) of isophthalic acid, 446.9 g (2.4 mol) of 4,4'-dihydroxybiphenyl and 1347.6 g (13.2 mol) of acetic anhydride. After the atmosphere in the reactor was sufficiently replaced with nitrogen, 0.18 g of 1-methylimidazole was added. The temperature was raised to 150°C over 30 minutes under nitrogen flow, and the mixture was refluxed for 30 minutes by keeping at the same temperature. After adding 2.4 g of 1-methylimidazole, the temperature was raised to 320° C. over a period of 2 hours and 50 minutes while distilling off acetic acid distilled as a by-product and unreacted acetic anhydride. The time at which an increase in torque was recognized was taken as the end of the reaction and the prepolymer was removed. The obtained prepolymer was cooled to room temperature, and then...

manufacture Embodiment 2

[0118] A prepolymer was obtained in the same manner as in Production Example 1 except that 1-methylimidazole was not added. The obtained prepolymer was pulverized by a coarse crusher, and then heated from room temperature to 250° C. in 1 hour, from 250° C. to 285° C. in 5 hours, and kept at 285° C. for 3 hours under a nitrogen atmosphere. for solid phase polymerization. The liquid crystal polyester thus obtained is called LCP2. The resulting LCP2 exhibited a flow onset temperature of 324 °C, (C 1 ) / (A 1 ) molar ratio is 1 / 3, ((B 1 )+(B 2 ))(C 1 ) molar ratio is 1 / 1, (B 2 ) / (B 1 ) molar ratio is 1 / 3.

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Abstract

A liquid-crystalline polyester resin composition is provided including a liquid-crystalline polyester obtained by polymerizing monomers of an aromatic hydroxycarboxylic acid in the presence of an imidazole compound. The composition also includes a mica which is a muscovite and has a volume average particle diameter of 40 [mu]m or less and a specific surface area of 6 m2 / g or less, the amount of the mica being 15 to 100 parts by weight based on 100 parts by weight of the liquid-crystalline polyester. The liquid-crystalline polyester resin composition has melt fluidity sufficient to be molded into a connector having an ultra-thin wall thickness portion. The resulting connector has sufficiently suppressed warp and sufficient soldering resistance.

Description

technical field [0001] The present invention relates to a liquid crystal polyester resin composition usable as a molding material for manufacturing electronic components, and electronic components using the same, especially connectors. Background technique [0002] Liquid crystal polyester has excellent melt fluidity (melt fluidity), and thus is used as a mold for manufacturing electronic parts such as molded articles having thin-walled parts, especially electronic parts having thin-walled parts and complex shapes such as connectors. plastic material. In order to improve the characteristics of electronic components such as mechanical strength, as a molding material for electronic components, liquid crystalline polyester resins including liquid crystalline polyester, fibrous fillers (glass fibers, etc.) and platy fillers (talc, etc.) have been combined Various studies have been carried out. [0003] With the development of surface mount technology related to the formation o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08K3/04C08G63/60C08G63/78H01R13/46
CPCC09K19/3809B29C45/00C04B2235/3472C09K19/20C09K19/3441
Inventor 福原义行山内宏泰
Owner SUMITOMO CHEM CO LTD
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