# US 9,437,790 B2 · Polyester resin composition having good yellowing resistance and impact resistance

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- Number: US 9,437,790 B2
- Document ID: US9437790B2
- Status: Granted
- Kind: B2
- Application number: 14/367,416
- Filed: 2012-12-26
- Published: 2014-11-27
- Granted: 2016-09-06
- Earliest claimed: 2011-12-28
- Assignees: Cheil Industries Inc.
- Applicants: Cheil Industries Inc.
- Inventors: Pil Ho Kim; In Sik Shim; Jong Cheol Lim; Sun Ho Song; Sang Hwa Lee
- Web page: https://patentgrep.com/patent/US9437790B2

## CPC

- H10H 20/856: Reflecting means
- C08K 3/013: Fillers, pigments or reinforcing additives
- C08K 3/22: of metals
- C08L 23/02: not modified by chemical after-treatment
- C08L 67/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds (C08L67/06 takes precedence)
- H10H 20/0363: {of optical field-shaping means}
- H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

The polyester resin composition of the present invention is characterized by comprising: (A) 100 parts by weight of a high heat resistant polyester resin having a main chain formed by a structure derived from aromatic dicarboxylic acid and alicyclic diol, wherein the melting point of the high heat resistant polyester resin is 200° C. or more; (B) 0.1 to 80 parts by weight of white pigment; and (C) 1 to 40 parts by weight of polyolefin copolymer. The resin composition of the present invention further comprises 1 to 40 parts by weight of a high stiffness polyester resin having a main chain comprising a structure derived from aromatic dicarboxylic acid and aliphathic diol. The molding foam, which is obtained from the polyester resin composition and the manufactured polyester resin composition, has good flexibility, heat resistance, and yellowing resistance and can be used for an LED reflecting plate due to having improved impact strength.

## Claims

### Claim 1

A polyester resin composition comprising:
(A) 100 parts by weight of polyester resin, wherein the polyester resin is an ethylene glycol modified polycyclohexanedimethylene terephthalate based resin including a main chain derived from terephthalic acid and a diol component including 15 to less than 100 mol % of 1,4-cyclohexanedimethanol and greater than 0 to 85 mol % of ethylene glycol and having a melting point of 200° C. or more;
(B) 0.1 to 80 parts by weight of white pigment; and
(C) 1 to 40 parts by weight of polyolefin copolymer,
wherein the ethylene glycol modified polycyclohexanedimethylene terephthalate based resin (A) includes repeat units from ethylene glycol and repeat units represented by Chemical Formula 1:
wherein n is an integer from 50 to 500.

### Claim 2 (depends on 1)

The polyester resin composition of claim 1, wherein the diol component of the polyester resin (A) further comprises one or more C6-C21 aromatic diols, C3-C8 aliphatic diols, or a combination thereof.

### Claim 3 (depends on 2)

The polyester resin composition of claim 2, wherein the C6-C21 aromatic diols or the C3-C8 aliphatic diols comprise propane-1,3-diol, butane-1,4-diol, pentane-1,5-diol, hexane-1,6-diol, 3-methylpentane-2,4-diol, 2-methylpentane-1,4-diol, 2,2,4-trimethylpentan-1,3-diol, 2-ethylhexane-1,3-diol, 2,2-diethylpropane-1,3-diol, 1,4-cyclobutanedimethanol, 2,2-bis-(hydroxyethoxyphenyl)-propane, 2,2-bis-(4-hydroxypropoxyphenyl)-propane or a combination thereof.

### Claim 4 (depends on 1)

The polyester resin composition of claim 1, wherein the white pigment (B) comprises titanium oxide, zinc oxide, zinc sulfide, white lead, zinc sulfate, barium sulfate, calcium carbonate, aluminum oxide, or a combination thereof.

### Claim 5 (depends on 1)

The polyester resin composition of claim 1, wherein the white pigment (B) is titanium dioxide having an average particle diameter of 0.05 to 2.0 μm.

### Claim 6 (depends on 1)

The polyester resin composition of claim 1, wherein the polyolefin copolymer (C) comprises polyethylene, polypropylene, ethylene-propylene copolymer or a combination thereof as main chain in an amount of 70 to 95% by weight.

### Claim 7 (depends on 1)

The polyester resin composition of claim 1, wherein the polyester resin composition further comprises one or more additives selected from the group consisting of fluorescence brightening agents, lubricants, release agents, nucleating agents, antistatic agents, stabilizers, reinforcement materials, inorganic additives, colorants, and combinations thereof.

### Claim 8 (depends on 1)

The polyester resin composition of claim 1, wherein the polyester resin composition has an initial reflectance measured at a 440 nm wavelength light of 90% or more, a reflectance reduction measured after the specimen is illuminated by a LED light source having a wavelength of 440 nm for 144 hours at a temperature of 85° C. and relative humidity of 85% of less than 10%, and a change of yellowing index (ΔYI) measured after the specimen is illuminated by a LED light source having a wavelength of 440 nm for 144 hours at a temperature of 85° C. and relative humidity of 85% of less than 5.

### Claim 9 (depends on 1)

The polyester resin composition of claim 1, wherein the polyester resin composition has an Izod impact strength of 18 kgfcm/cm or more measured in accordance with ASTM D256 with a thickness of ⅛″.

### Claim 10 (depends on 1)

The polyester resin composition of claim 1, wherein the polyolefin copolymer (C) comprises a functional group which has compatibility with resistant polyester resin (A) as a graft copolymerized branch in an amount of 5 to 30% by weight.

### Claim 11 (depends on 10)

The polyester resin composition of claim 10, wherein the functional group which has compatibility with the polyester resin (A) comprises an acrylate group comprising methylacrylate, ethylacrylate or butylacrylate, a modified ester group, an arylate group, an acrylonitrile group, or a combination thereof.

### Claim 12 (depends on 1)

The polyester resin composition of claim 1, wherein the polyester resin composition further comprises 80 parts by weight or less of a filler (E) based on 100 parts by weight of the polyester resin (A).

### Claim 13 (depends on 12)

The polyester resin composition of claim 12, wherein the filler (E) comprises carbon fibers, glass fibers, boron fibers, glass beads, glass flakes, carbon black, diatomaceous earth, clay, kaolin, talc, mica, calcium carbonate, wollastonite, potassium titanate whiskers, aluminum boric acid whiskers, zinc oxide whiskers, calcium whiskers, or a combination thereof.

### Claim 14 (depends on 13)

The polyester resin composition of claim 13, wherein the glass fibers have an average length of 0.1 to 20 mm, and an aspect ratio of 10 to 2,000.

### Claim 15 (depends on 1)

The polyester resin composition of claim 1, further comprising (D) 1 to 40 parts by weight of polyester resin including a main chain derived from aromatic dicarboxylic acid and aliphatic diol based on 100 parts by weight of the polyester resin (A).

### Claim 16 (depends on 15)

The polyester resin composition of claim 15, wherein the polyester resin (D) comprises polybutylene terephthalate based resin or polyethylene terephthalate based resin.

### Claim 17 (depends on 16)

The polyester resin composition of claim 16, wherein the polyethylene terephthalate based resin is polyethylene terephthalate, a copolymer of polyethylene terephthalate with polytetramethylene glycol, polypropylene glycol, aliphatic polyester, aliphatic polyamide, or a combination thereof.

### Claim 18 (depends on 16)

The polyester resin composition of claim 16, wherein the polybutylene terephthalate based resin is polybutylene terephthalate, a copolymer of polybutylene terephthalate with polytetramethylene glycol, polyethylene glycol, polypropylene glycol, aliphatic polyester, aliphatic polyamide, or a combination thereof.

### Claim 19 (depends on 16)

The polyester resin composition of claim 16, wherein the polyethylene terephthalate based resin is glycol modified polyethylene terephthalate comprising terephthalic acid copolymerized with diol components which include ethylene glycol in amount of more than 50 mole % and 1,4-cyclohexane dimethanol in amount of less than 50 mole %, wherein the polyethylene terephthalate based resin is not the same as the polyester resin (A).

### Claim 20 (depends on 1)

A molded article prepared from the polyester resin composition of claim 1.

### Claim 21 (depends on 20)

The molded article of claim 20, wherein the molded article is a reflector for a LED.