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Polyester resin composition for reflective materials and reflection plate containing same

A technology of polyester resin and reflective materials, which is applied in the direction of semiconductor devices, electrical components, circuits, etc., can solve the problems of reduced reflectivity and discoloration of reflective plates, and achieve the effects of maintaining whiteness, less discoloration, and less decrease in reflectivity

Inactive Publication Date: 2017-02-22
MITSUI CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyamide resin may discolor due to terminal amino groups or amide bonds, which may reduce the reflectance of the reflector

Method used

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  • Polyester resin composition for reflective materials and reflection plate containing same
  • Polyester resin composition for reflective materials and reflection plate containing same
  • Polyester resin composition for reflective materials and reflection plate containing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0168] Using a drum mixer, 54.5 parts by mass of the polymer prepared above as the polyester resin (A), 10 parts by mass of (B-1) wollastonite as the fibrous reinforcing material (B), and the white pigment (C ) 35 parts by mass of the above-mentioned titanium oxide and 0.5 parts by mass of (D-1) Irganox 1010 (manufactured by BASF Corporation) as an antioxidant (D) were mixed. The obtained mixture was melted and kneaded with a twin-screw extruder (TEX30α manufactured by Nippon Steel Co., Ltd.) at a cylinder temperature of 300°C, and then extruded in a strand shape. The extrudate was cooled in a water tank, and then the strand was pulled by a pelletizer and cut to obtain a pelletized polyester resin composition for reflective materials. It was confirmed that compoundability was good.

Embodiment 2～5

[0169] [Examples 2 to 5 and Comparative Examples 1 to 4]

[0170] Except having changed to the composition ratio shown in Table 1 or 2, it carried out similarly to Example 1, and obtained the pellet-form polyester resin composition.

[0171] With respect to the polyester resin composition obtained in each example and each comparative example, the various reflectances and fluidity of molded articles were evaluated by the following methods.

[0172]

[0173] (Initial reflectivity)

[0174] Using the following molding machine, the obtained pelletized polyester resin composition was injection molded under the following molding conditions to prepare a test piece having a length of 30 mm, a width of 30 mm, and a thickness of 0.5 mm. With respect to the obtained test piece, Minolta Corporation CM3500d was used, and the reflectance in the wavelength region of 360 nm to 740 nm was determined. The reflectance at 450 nm was taken as the representative value, and was taken as the initial reflect...

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Abstract

The purpose of the present invention is to provide a polyester resin composition for obtaining a reflection plate that has high reflectance and is suppressed in decrease of the reflectance even if exposed to heat during the production process of an LED package or during the reflow soldering step at the time of mounting, or exposed to heat and light from a light source in the environment where the reflection plate is used. A polyester resin composition for reflective materials according to the present invention contains: 30-80% by mass of (A) a polyester resin which has a melting point (Tm) or glass transition temperature (Tg) of 250 DEG C or more as measured by a differential scanning calorimeter (DSC); 5-30% by mass of (B) a fibrous reinforcing material which has an average fiber length (l) of 2-300 [mu]m, an average fiber diameter (d) of 0.05-18 [mu]m and an aspect ratio (l / d) of 2-20, said aspect ratio being obtained by dividing the average fiber length (l) by the average fiber diameter (d); and 5-50% by mass of (C) a white pigment (with the total of (A), (B) and (C) being 100% by mass).

Description

Technical field [0001] The present invention relates to a polyester resin composition for reflective materials and a reflective plate containing the polyester resin composition. Background technique [0002] For light sources such as light emitting diodes (LEDs) and organic EL, which effectively utilize the characteristics of low power and long life, they have been widely used in lighting and display backlights. In order to effectively utilize the light emitted from these light sources, reflective plates have been used in various situations. [0003] For example, an LED package may be mainly composed of a housing portion including a substrate and a reflective plate integrally formed therewith, an LED arranged inside the housing, and a transparent sealing member that seals the LED. Such an LED package can be manufactured through the following processes: a process of obtaining a housing part including a reflector formed on a substrate; a process of arranging LEDs in the housing part...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/02C08G63/199C08K3/22C08K7/10H01L33/60
CPCC08K7/10C08L67/02H01L33/60C08K2201/016C08K2003/2241C08K2201/003C08K2201/004C08K3/22C08K3/34C08K7/14C08G63/199C08K2003/2237H01L2933/0058
Inventor 大清水薰小笠原英人江端洋树滨隆司
Owner MITSUI CHEM INC