# US 10,501,621 B2 · Polyester resin composition, injection molded article, light-reflecting base body, and light-reflecting body

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- Number: US 10,501,621 B2
- Document ID: US10501621B2
- Status: Granted
- Kind: B2
- Application number: 15/315,006
- Filed: 2015-07-01
- Published: 2017-07-06
- Granted: 2019-12-10
- Earliest claimed: 2014-07-01
- Assignees: Mitsubishi Engineering-Plastics Corporation
- Applicants: Mitsubishi Engineering-Plastics Corporation
- Inventors: Fumihiro Mutou
- Web page: https://patentgrep.com/patent/US10501621B2

## CPC

- C08L 67/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds (C08L67/06 takes precedence)
- C08K 3/013: Fillers, pigments or reinforcing additives
- C08K 3/26: Carbonates; Bicarbonates
- C23C 14/14: Metallic material, boron or silicon
- C23C 14/205: {by cathodic sputtering}
- G02B 1/04: made of organic materials, e.g. plastics (G02B1/08 takes precedence)
- G02B 5/0808: {having a single reflecting layer (G02B5/0883, G02B5/0891 take precedence)}
- C08K 2201/003: Additives being defined by their diameter
- C08L 25/12: with unsaturated nitriles
- C08L 2205/025: containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
- C08L 2205/03: containing three or more polymers in a blend
- C08L 2205/035: containing four or more polymers in a blend
- C08L 2205/06: having improved processability or containing aids for moulding methods
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04)
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

A polyester resin composition is provided that exhibits a low shrinkage ratio and excellent mold release properties while maintaining a high mechanical strength, that also provides excellent surface properties and an excellent appearance for a molded article and an excellent appearance when vapor deposited, and that resists the production of fogging even during high-temperature use. An injection molded article, a light-reflecting base body, and a light-reflecting body are also provided. The polyester resin composition characteristically contains 0.1 to 20 mass parts of (B) an inorganic filler having an average primary particle diameter of not more than 2.5 μm, per 100 mass parts of (A) a resin component containing (A1) polybutylene terephthalate resin pellets and (A2) a polyester resin powder.

## Claims

### Claim 1

A polyester resin composition, comprising:
(A) a resin component comprising:
(A1) polybutylene terephthalate resin pellets, and
(A2) a polyester resin powder; and
(B) an inorganic filler having an average primary particle diameter of not more than 2.5 μm,
wherein:
a content of the inorganic filler (B) is 0.1 to 20 mass parts per 100 mass parts of the resin component (A); and
the inorganic filler (B) is at least one selected from the group consisting of calcium carbonate, talc, mica, silica, kaolin, barium sulfate and zirconium silicate.

### Claim 2 (depends on 1)

The polyester resin composition according to claim 1, wherein a blend of the polyester resin powder (A2) and the inorganic filler (B) has a maximum sliding shear stress of not more than 8 N.

### Claim 3

A polyester resin composition, comprising:
(A) a resin component comprising:
(A1) polybutylene terephthalate resin pellets, and
(A2) a polyester resin powder; and
(B) an inorganic filler having an average primary particle diameter of not more than 2.5 μm,
wherein:
a content of the inorganic filler (B) is 0.1 to 20 mass parts per 100 mass parts of the resin component (A); and
an average particle diameter of the polyester resin powder (A2) is 1000- to 8000-times the average primary particle diameter of the inorganic filler (B).

### Claim 4 (depends on 1)

The polyester resin composition according to claim 1, wherein a content of the polyester resin powder (A2) is 1 to 50 mass % in the resin component (A).

### Claim 5 (depends on 1)

The polyester resin composition according to claim 1, wherein an average particle diameter of the polyester resin powder (A2) is 100 to 1,500 μm.

### Claim 6 (depends on 1)

The polyester resin composition according to claim 1, wherein a mass ratio (A2):(B) between contents of the polyester resin powder (A2) and the inorganic filler (B) is 30:70 to 95:5.

### Claim 7 (depends on 1)

The polyester resin composition according to claim 1, wherein the polyester resin powder (A2) is a polybutylene terephthalate resin powder.

### Claim 8 (depends on 1)

The polyester resin composition according to claim 1, wherein the inorganic filler (B) is at least one selected from the group consisting of calcium carbonate, talc, mica, silica, kaolin, and zirconium silicate.

### Claim 9 (depends on 1)

The polyester resin composition according to claim 1, wherein the inorganic filler (B) is calcium carbonate.

### Claim 10 (depends on 1)

The polyester resin composition according to claim 1, wherein the resin component (A) further comprises:
(A3) a polyethylene terephthalate resin, (A4) a styrenic resin, or both, and a content of the polyethylene terephthalate resin (A3), the styrenic resin (A4), or both, in the resin component (A) is 1 to 40 mass %.

### Claim 11 (depends on 1)

The polyester resin composition according to claim 1, further comprising:
0.001 to 2 mass parts of a mold releasing agent having an acid value of 10 to 40 mg KOH/g, per 100 mass parts of the resin component (A).

### Claim 12 (depends on 1)

The polyester resin composition according to claim 1, further comprising:
0.001 to 1 mass part of a hindered phenol stabilizer having a melting point of at least 150° C., per 100 mass parts of the resin component (A).

### Claim 13 (depends on 1)

An injection molded article obtained by injection molding of the polyester resin composition according to claim 1.

### Claim 14 (depends on 13)

The injection molded article according to claim 13, which is a light-reflecting base body.

### Claim 15 (depends on 14)

A light-reflecting body, comprising a light-reflecting layer disposed on the light-reflecting base body according to claim 14.

### Claim 16 (depends on 15)

The light-reflecting body according to claim 15, wherein the light-reflecting layer is formed of a metal thin film layer, and the metal thin film layer is in direct contact with a surface of the light-reflecting base body.

### Claim 17 (depends on 1)

The polyester resin composition according to claim 1, wherein
a specific gravity of the inorganic filler (B) is not more than 3 g/cm3; and
a surface of a molded article obtained by injection molding of the polyester resin composition has a maximum roughness height Ry of not more than 5.5 μm.

### Claim 18 (depends on 17)

The polyester resin composition according to claim 17, wherein the surface of the molded article has an arithmetic average roughness Ra of not more than 0.25 μm.

### Claim 19 (depends on 17)

The polyester resin composition according to claim 17, wherein the molded article in which an aluminum layer with a thickness of 150 nm is disposed on a surface has a diffuse reflectance of less than 1% on the aluminum layer side.

### Claim 20 (depends on 3)

The polyester resin composition according to claim 3, wherein a blend of the polyester resin powder (A2) and the inorganic filler (B) has a maximum sliding shear stress of not more than 8 N.