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Liquid-crystal polyester resin composition

A technology of resin composition and liquid crystal polyester, which is applied in liquid crystal materials, televisions, cameras, etc., can solve the problems of not involving the surface hardness of the molded body, not involving the surface hardness of the molded body falling off, different particle size ranges and additions, etc. Achieves the effect of excellent surface shedding characteristics, small impact deformation, and less occurrence

Active Publication Date: 2014-06-18
JX NIPPON OIL & ENERGY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the surface hardness of the molded body is not covered
In addition, Patent Document 5 proposes a resin composition for improving reflectance or hue by blending titanium oxide as a white pigment in a liquid crystal polyester resin for reflectors such as LEDs made of resin, but does not refer to the surface hardness of molded products or Generation of powder (particles)
Patent Document 6 proposes: in 100 parts by weight of liquid crystal polyester, 1 to 5 parts by weight of silica particles with an average particle diameter of 0.08 to less than 0.2 μm are uniformly dispersed, and the material is thin-walled and highly rigid, but silica The particle size range and addition amount of the particles are different from those of the present invention. In addition, it does not involve the surface hardness of the molded body or the recognition of the powder (particle) falling off from the surface.

Method used

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  • Liquid-crystal polyester resin composition
  • Liquid-crystal polyester resin composition
  • Liquid-crystal polyester resin composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0099] The present invention will be described more specifically by way of examples and comparative examples below, but the present invention is not limited by the following examples.

[0100] (experiment method)

[0101] The measurement methods and evaluation methods of the properties of the liquid crystalline polyester resin compositions and molded articles obtained therefrom in Examples and Comparative Examples are as follows.

[0102] (1) Determination of melt viscosity

[0103] The melt viscosity of the liquid crystal polyester resin composition was obtained using a capillary rheometer (manufactured by Intesco Co., Ltd., 2010). As a capillary, a capillary with a diameter of 1.00 mm, a length of 40 mm, and an inflow angle of 90° was used, and the shear rate was 100 sec. -1 , from 300°C to +4°C / min at a heating rate of +4°C / min to perform apparent viscosity measurement while heating at a constant speed, and obtain the apparent viscosity at 370°C as the test value. Also, i...

Embodiment 1～5 and comparative example 1～3

[0125] The powdered liquid crystal polyester (A) and filler obtained in the above production example were mixed with a belt mixer according to the composition ratio shown in Table 1, and the mixture was dried in an air oven at 150° C. for 2 hours. The dried mixture was melt-kneaded at a twin-screw extruder (manufactured by Kobe Steel Works, KTX-46) with a maximum cylinder temperature of 380° C. at an extrusion rate of 140 kg / hr. A pellet of the target liquid crystal polyester resin composition was obtained. Using the obtained pellets, various physical properties were measured by the above-mentioned test methods. The results are shown in Table 1.

[0126] [Table 1]

[0127] Composition (parts by mass)

[0128]

[0129] [Table 2]

[0130] result

[0131]

Melt viscosity

Shedding

Rockwell hardness

Izod impact strength

Deflection temperature under load (DTUL)

Pa·S

indivual

-

KJ / m2

℃

Example 1

107

...

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Abstract

A liquid crystal polyester resin composition for camera modules is used, the composition including, based on 100 parts by mass of the composition as a whole, (A) 49.5 to 69.5 parts by mass of a liquid crystal polyester, (B) 30.0 to 50.0 parts by mass of an irregular form or spherical powder having a Mohs hardness of 5 or higher and a primary particle diameter of 5 mum or less, and (C) 0.5 to 5.0 parts by mass of carbon black. The use of the resin composition allows a reduction in the amount of dust generated (particles falling off) during the production of the camera, the use of the camera, and the operation of the camera modules. The resin composition has high surface hardness, is excellent in balance between heat resistance, stiffness, moldability, and resistance to falling of particles off a surface, and causes no malfunction during autofocus control.

Description

[0001] Technology area [0002] The present invention relates to a material suitable for camera modules, and more specifically, to a "lens barrel part" that has high heat resistance, excellent thin-wall formability, high surface hardness, good mechanical properties, and no malfunction in auto-focus camera modules In the production process of camera module components such as (the part where the lens is mounted), the "holder part" (the part where the tube is mounted and fixed on the substrate), the "CMOS (image sensor) frame", the "shutter and shutter coil part", etc. , and a liquid crystal polyester resin composition for a camera module that generates little dust (shedding of powder) during driving of the camera module. Background technique [0003] When transmitting in digital form, the main device used for input and output of information is a camera module. Installed in mobile phones, notebook computers, digital cameras, digital cameras, etc., as a photography function, it n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/03B29C45/00C08K3/04C08K3/10C08K7/18G02B7/02G03B9/08G03B17/02H04N5/225
CPCB29K2105/0079C08K3/36B29C45/00C08K2201/009B29K2067/00C08K3/22C09K19/3809C08K3/04C08L67/03B29C45/0001C08L67/00C09K2323/00
Inventor 中山敏雄室内聪士
Owner JX NIPPON OIL & ENERGY CORP