# US 7,608,666 B2 · Polyester resin composition

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- Number: US 7,608,666 B2
- Document ID: US7608666B2
- Status: Granted
- Kind: B2
- Application number: 10/555,208
- Filed: 2004-04-28
- Published: 2006-08-10
- Granted: 2009-10-27
- Earliest claimed: 2003-05-02
- Assignees: Toray Industries, Inc.
- Inventors: Hideo Matsuoka; Mitsushige Hamaguchi; Toru Nishimura
- Web page: https://patentgrep.com/patent/US7608666B2

## CPC

- C08L 67/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds (C08L67/06 takes precedence)
- C08L 23/025: Copolymers of unspecified olefins with monomers other than olefins
- C08L 23/0815: {with aliphatic 1-olefins containing one carbon-to-carbon double bond}
- C08L 67/03: the dicarboxylic acids and dihydroxy compounds having the carboxyl- and the hydroxy groups directly linked to aromatic rings
- C08L 81/04: Polysulfides
- C08L 101/06: containing oxygen atoms {(C08L101/025 takes precedence)}
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

This invention is a polyester resin composition comprising 100 parts by weight of a resin composition consisting of 60 to 95 wt % of (a) a polyester resin and 5 to 40 wt % of (b) an olefin-based resin, and 0.5 to 30 parts by weight of (c) one or more resins selected from polyphenylene sulfide resins and liquid crystal resins, wherein said olefin-based resin (b) is composed of (b-1) a functional group-containing olefin copolymer having at least one kind of functional groups selected from carboxylic acid groups, carboxylic anhydride groups, carboxylic ester groups, metal carboxylate groups and epoxy groups and (b-2) an ethylene/α-olefin copolymer obtained by copolymerizing ethylene and an a-olefin with 3 to 20 carbon atoms; and the polyester resin (a) forms a continuous phase, while the olefin-based resin (b) is dispersed as particles with an average particle size of 0.01 to 2 μm in the composition. This invention provides a polyester resin composition having excellent flexibility and impact resistance in a low-temperature atmosphere, also having excellent flowability and chemicals resistance, and suitable for injection molding.

## Claims

### Claim 1

A polyester resin composition comprising: 1) 100 parts by weight of a resin composition consisting of 60 to 90 wt % of (a) a polyester resin with an amount of carboxyl end groups of from 35 to 49 eq/t and is at least one selected from the group consisting of polyethylene terephthalate, polyethylene-2,6-naphthalene dicarboxylate and their copolymers, and 10 to 40 wt % of (b) an olefin-based resin, and 2) 5 to 15 parts by weight of (c) one or more resins selected from polyphenylene sulfide resins and liquid crystal resins,
wherein said olefin-based resin (b) comprises 3 to 20 wt % of (b-1) a functional group-containing olefin copolymer having at least one kind of functional groups selected from carboxylic acid groups, carboxylic anhydride groups and epoxy groups and 7 to 25 wt % of (b-2) an ethylene/α-olefin copolymer obtained by copolymerizing ethylene and an α-olefin with 3 to 20 carbon atoms; and
the polyester resin (a) forms a continuous phase, while the olefin-based resin (b) is dispersed as particles with an average particle size of 0.01 to 2 μm in the composition, and the polyphenylene sulfide resin (c) or liquid crystal resin is dispersed in the polyester resin (a) phase as particles having an average particle size of 1 to 100 nm and the polyphenylene sulfide has a melt viscosity of 12 to 40 Pa·s.

### Claim 2 (depends on 1)

The polyester resin composition according to claim 1, the weight reduction rate of which after having been immersed in 23° C. hexafluoroisopropanol for 1 hour is from 0 to 5%.

### Claim 3 (depends on 1)

The polyester resin composition according to claim 1, wherein the functional group-containing olefin copolymer (b-1) is an olefin copolymer having epoxy groups.

### Claim 4 (depends on 1)

The polyester resin composition according to claim 1, wherein the functional group-containing olefin copolymer (b-1) is a copolymer obtained from ethylene and/or an α-olefin and an αβ-unsaturated carboxylic acid glycidyl ester.

### Claim 5 (depends on 1)

The polyester resin composition according to claim 1, wherein the ingredient (c) is a polyphenylene sulfide resin which has an ash content of 0.1 to 2 wt %.

### Claim 6 (depends on 1)

The polyester resin composition according to claim 1, wherein the ingredient (c) is a polyphenylene sulfide resin which has a chloroform extraction content of 1 to 5 wt %.

### Claim 7 (depends on 1)

The polyester resin composition according to claim 1, which has a tensile break elongation of 20 to 400% as measured according to ASTM-D638 at a temperature of −40° C. and an impact strength of 500 to 2000 J/m as measured according to ASTM-D-256.

### Claim 8 (depends on 1)

The polyester resin composition according to claim 1, wherein the polyester resin (a) is polyethylene terephthalate, and the exothermic peak temperature (Tmc) observed in the differential calorimetry of the resin composition during cooling from 300° C. at a cooling rate of 20° C./min is 190° C. or higher.