# US 8,569,403 B2 · Thermoplastic resin composition for light reflector, formed article for light reflector, light reflector, and method for producing formed article for light reflector

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- Number: US 8,569,403 B2
- Document ID: US8569403B2
- Status: Granted
- Kind: B2
- Application number: 10/569,104
- Filed: 2004-08-25
- Published: 2006-12-28
- Granted: 2013-10-29
- Earliest claimed: 2003-08-26
- Assignees: Mitsubishi Rayon Co., Ltd.
- Applicants: Yasunori Shirai; Haruo Ueda; Tamae Takagi
- Inventors: Yasunori Shirai; Haruo Ueda; Tamae Takagi
- Web page: https://patentgrep.com/patent/US8569403B2

## CPC

- G02B 5/0866: {incorporating one or more organic, e.g. polymeric layers}
- B29C 45/0001: {characterised by the choice of material}
- B29C 45/0013: {using fillers dispersed in the moulding material, e.g. metal particles}
- B29C 45/37: Mould cavity walls {, i.e. the inner surface forming the mould cavity, e.g. linings}
- C08K 5/103: with polyalcohols
- G02B 1/04: made of organic materials, e.g. plastics (G02B1/08 takes precedence)
- B29C 45/0053: {combined with a final operation, e.g. shaping (injection-compression moulding B29C45/561)}
- B29C 2045/0079: {applying a coating or covering}
- B29K 2067/00: Use of polyesters {or derivatives thereof}, as moulding material
- B29L 2011/0083: {Reflectors}
- B29L 2031/747: {Lightning equipment}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES

## Abstract

Thermoplastic resin compositions for a light reflector contain 2 to 45 parts by mass per 100 parts by mass of a thermoplastic resin (A) of an inorganic filler (B1) treated with a fatty acid type surface treating agent and having an average particle diameter of not more than 3 μm, or 2 to 45 parts by mass of an inorganic filler (B2) having a refractive index α of 1.61≦α≦2.5 and having an average particle diameter of not more than 3 μm, 0.01 to 3 parts by mass of glycerol triester of a fatty acid and/or a glycerol diester of a fatty acid (C1), and 0.01 to 3 parts by mass of a glycerol monoester of a fatty acid (C2). A molded article for a light reflector and a light reflector in which a light reflecting metal layer is directly formed on at least a part of the surface of the molded article is produced from one of such thermoplastic resin compositions.

## Claims

### Claim 1

A thermoplastic resin composition for a light reflector comprising:
a thermoplastic resin (A); and
barium sulfate;
wherein
a content of the barium sulfate is 2 to 45 parts by mass per 100 parts by mass of the thermoplastic resin (A),
a refractive index α of the barium sulfate is from 1.61 to 2.5 and
an average particle diameter of the barium sulfate is from 0.05 to 1 μm;
the thermoplastic resin (A) comprises:
polybutylene terephthalate;
polyethylene terephthalate; and
from 4 to 10 mass % of at least one vinyl copolymer thermoplastic resin selected from the group of vinyl thermoplastic resins consisting of an acrylonitrile-styrene copolymer resin having a mass ratio of acrylonitrile to styrene of from 20/80 to 45/55, an epoxy group containing acrylonitrile-styrene copolymer resin having a % by mass composition of 0.1 to 0.4% glycidyl methacrylate, 15 to 40% acrylonitrile and 60 to 84.9% styrene and a maleimide copolymer resin of N-phenyl maleimide/styrene/acrylonitrile having 15 to 60 mass % N-phenyl maleimide;
wherein
a mass ratio of polybutylene terephthalate to polyethylene terephthalate is from 95/5 to 55/45.

### Claim 2 (depends on 1)

A molded article for a light reflector comprising the thermoplastic resin composition defined in claim 1.

### Claim 3 (depends on 2)

The molded article for a light reflector according to claim 2 wherein
a light reflectance, at the surface of the molded article is 65% or more at a wave length of light in the range of from 420 to 700 nm and
a linear shrinkage of the molded article is not more than 1.6%.

### Claim 4 (depends on 3)

The molded article for a light reflector according to claim 3 wherein the light reflectance, at the surface of the molded article, is 70% or more at a wave length of light in the range of from 420 to 700 nm.

### Claim 5 (depends on 3)

A light reflector, comprising:
the molded article defined in claim 3; and
a light reflecting metal layer;
wherein the light reflecting metal layer is directly on at least a part of the surface of the molded article.

### Claim 6 (depends on 1)

The thermoplastic resin composition for a light reflector according to claim 1 wherein the barium sulfate is a settleable barium sulfate.

### Claim 7 (depends on 6)

The thermoplastic resin composition for a light reflector according to claim 6 wherein the particle diameter of the settleable barium sulfate is from 0.1 to 0.3 μm.