Polyester-based resin composition and molded article manufactured using the same

Patent metadata

Field	Value
Publication number	US-12065564-B2
Application number	US-202017285845-A
Country	US
Kind code	B2
Filing date	Oct 16, 2020
Priority date	Oct 24, 2019
Publication date	Aug 20, 2024
Grant date	Aug 20, 2024

Abstract

The present disclosure relates to a polyester-based resin composition and a molded article manufactured using the same. More particularly, the present disclosure relates to a polyester-based resin composition including 93 to 99.5% by weight of a polybutylene terephthalate resin; 0.1 to 3% by weight of a polar group-containing lubricant; and 0.1 to 2% by weight of an antioxidant and a molded article manufactured using the polyester-based resin composition.

First claim

The invention claimed is:

1. A polyester-based resin composition, comprising:
93 to 99.5% by weight of a polybutylene terephthalate resin;
0.1 to 3% by weight of a polar group-containing lubricant; and
0.1 to 2% by weight of an antioxidant,
wherein the polar group-containing lubricant has a dropping point of 115 to 128° C.

2. The polyester-based resin composition according to claim 1 , wherein the polybutylene terephthalate resin has an intrinsic viscosity of 0.90 to 1.15 dl/g.

3. The polyester-based resin composition according to claim 1 ,
wherein the polybutylene terephthalate resin comprises a first polybutylene terephthalate resin having a relative viscosity of 0.95 to 1 as measured according to ASTM D1243 and a second polybutylene terephthalate resin having a relative viscosity of 0.75 to 0.8 as measured according to ASTM D1243.

4. The polyester-based resin composition according to claim 1 , wherein the polar group-containing lubricant is a lubricant containing at least one polar group of a hydroxyl group, a carbonyl group, and an amino group.

5. The polyester-based resin composition according to claim 1 , wherein the polar group-containing lubricant a crystallization temperature (Tm) of 102 to 122° C.

6. The polyester-based resin composition according to claim 1 , wherein the antioxidant is a phenolic antioxidant.

7. The polyester-based resin composition according to claim 1 , wherein the polyester-based resin composition further comprises a hydrolysis stabilizer.

8. The polyester-based resin composition according to claim 7 , wherein the hydrolysis stabilizer is comprised in an amount of 0.01 to 2% by weight.

9. The polyester-based resin composition according to claim 7 , wherein the hydrolysis stabilizer is an aromatic group-containing polycarbodiimide-based compound.

10. The polyester-based resin composition according to claim 1 , wherein the polyester-based resin composition further comprises a styrene-acrylonitrile copolymer.

11. The polyester-based resin composition according to claim 10 , wherein the styrene-acrylonitrile copolymer is comprised in an amount of 0.5 to 6% by weight.

12. The polyester-based resin composition according to claim 10 , wherein the styrene-acrylonitrile copolymer comprises 71 to 75% by weight of styrene and 25 to 29% by weight of acrylonitrile.

13. The polyester-based resin composition according to claim 1 , wherein the polyester-based resin composition has a haze value of 10 or less.

14. A molded article comprising an extruded or injected product of the polyester-based resin composition of claim 1 .

15. The molded article according to claim 14 , wherein the molded article is a bezel for automobile lamps.

16. The molded article according to claim 15 , wherein the molded article has a haze value of 10 or less at 130 to 160° C.

17. A method of manufacturing an automotive headlamp bezel, comprising
an injection step of injecting the polyester-based resin composition according to claim 1 to manufacture a molded article;
a painting step of painting the manufactured molded article; and
a deposition step of depositing aluminum on the painted molded article.

18. A polyester-based resin composition, comprising:
93 to 99.5% by weight of a polybutylene terephthalate resin;
0.1 to 3% by weight of a polar group-containing lubricant; and
0.1 to 2% by weight of an antioxidant, wherein the polybutylene terephthalate resin has an intrinsic viscosity of 0.90 to 1.05 dl/g.

19. A polyester-based resin composition, comprising:
93 to 99.5% by weight of a polybutylene terephthalate resin;
0.1 to 3% by weight of a polar group-containing lubricant; and
0.1 to 2% by weight of an antioxidant,
wherein the polyester-based resin composition further comprises a hydrolysis stabilizer and a styrene-acrylonitrile copolymer,
wherein the styrene-acrylonitrile copolymer comprises 71 to 72% by weight of styrene and 28 to 29% by weight of acrylonitrile, and
wherein the hydrolysis stabilizer is an aromatic group-containing polycarbodiimide-based compound.

Assignees

• Lg Chemical Ltd

Inventors

• Ko Gun
• Lee Soo Min
• Jun Yi Seul
• Kim Myeung Il
• Park Jun Ki
• Park Jin Sol
• Hwang Hee Jae

Classifications

• C08L2205/06

  having improved processability or containing aids for moulding methods · CPC title

• C08L2205/035

  containing four or more polymers in a blend · CPC title

• C08L2205/025

  containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure · CPC title

• C08L2201/08

  Stabilised against heat, light or radiation or oxydation · CPC title

• B29L2031/30

  Vehicles, e.g. ships or aircraft, or body parts thereof {(vanes or blades B29L2031/08, air bags B29L2022/027)} · CPC title