Polyester resin composition and molded article manufactured therefrom

Patent metadata

Field	Value
Publication number	US-10508190-B2
Application number	US-201514971348-A
Country	US
Kind code	B2
Filing date	Dec 16, 2015
Priority date	Dec 17, 2014
Publication date	Dec 17, 2019
Grant date	Dec 17, 2019

Abstract

Disclosed herein is a polyester resin composition and a molded article manufactured therefrom. The polyester resin composition includes: (A) a polyester resin; (B) a white pigment; and (C) a reflectance retention agent comprising an inorganic compound having a pH of about 7.5 to about 14.

First claim

What is claimed is:

1. A polyester resin composition comprising:
(A) about 30 wt % to about 80 wt % of a polyester resin selected from the group consisting of a poly(cyclo-1,4-hexanedimethylene terephthalate);
(B) about 10 wt % to about 60 wt % of titanium oxide; and
(C) about 10 wt % to about 40 wt % of a reflectance retention agent comprising calcium silicate having a pH of 10.3 to about 11, each based on 100 wt % of the polyester resin composition,
wherein a molded article manufactured from the polyester resin composition has an initial reflectance R 0 of 92 or more, as measured at a wavelength of 450 nm using a colorimeter,
wherein the molded article manufactured from the polyester resin composition has a ratio of reflectance (R 1 ) of the molded article, as measured at a wavelength of 450 nm using a colorimeter after the molded article is left at 85° C. and 85% relative humidity (RH) for 100 hours, to initial reflectance (R 0 ) of the molded article, as measured at a wavelength of 450 nm using a colorimeter, (R 1 /R 0 ) of 0.98 or more;
wherein a molded article manufactured from the polyester resin composition has a ratio of reflectance (R 2 ) of the molded article, as measured at a wavelength of 450 nm using a colorimeter after the molded article is left at 85° C. and 85% relative humidity (RH) for 300 hours, to initial reflectance (R 0 ) of the molded article, as measured at a wavelength of 450 nm using a colorimeter, (R 2 /R 0 ) of 0.95 or more, and
wherein a molded article manufactured from the polyester resin composition has a difference between an initial yellow index of the molded article measured using a colorimeter and a yellow index of the molded article measured using a colorimeter after the molded article is left at 170° C. for 150 hours (ΔY) of 9 or less.

2. The polyester resin composition according to claim 1 , comprising:
about 40 wt % to about 75 wt % of the polyester resin (A);
about 15 wt % to about 50 wt % of the white pigment (B); and
about 10 wt % to about 30 wt % of the reflectance retention agent (C).

3. The polyester resin composition according to claim 2 , comprising:
about 50 wt % to about 70 wt % of the polyester resin (A);
about 15 wt % to about 25 wt % of the white pigment (B); and
about 10 wt % to about 30 wt % of the reflectance retention agent (C).

4. A polyester resin composition comprising:
(A) about 30 wt % to about 80 wt % of a polyester resin selected from the group consisting of a polyester resin including a repeat unit represented by Formula 1 and having a melting point of about 200° C. or more:

wherein n is an integer of 10 to 500;
(B) about 10 wt % to about 60 wt % of a white pigment;
(C) about 10 wt % to about 40 wt % of a reflectance retention agent comprising an inorganic compound calcium silicate having a pH of 10.3 to about 11, each based on 100 wt % of the polyester resin composition, and
optionally a UV stabilizer, fluorescent whitening agent, lubricant, release agent, nucleating agent, antistatic agent, stabilizer, reinforcing agent, inorganic additive, pigment, dye, or a combination thereof,
wherein a molded article manufactured from the polyester resin composition has an initial reflectance R 0 of 92 or more, as measured at a wavelength of 450 nm using a colorimeter,
wherein the molded article manufactured from the polyester resin composition has a ratio of reflectance (R 1 ) of the molded article, as measured at a wavelength of 450 nm using a colorimeter after the molded article is left at 85° C. and 85% relative humidity (RH) for 100 hours, to initial reflectance (R 0 ) of the molded article, as measured at a wavelength of 450 nm using a colorimeter, (R 1 /R 0 ) of 0.98 or more;
wherein the molded article manufactured from the polyester resin composition has a ratio of reflectance (R 2 ) of the molded article, as measured at a wavelength of 450 nm using a colorimeter after the molded article is left at 85° C. and 85% relative humidity (RH) for 300 hours, to initial reflectance (R 0 ) of the molded article, as measured at a wavelength of 450 nm using a colorimeter, (R 2 /R 0 ) of 0.95 or more, and
wherein the molded article has a difference between an initial yellow index of the molded article measured using a colorimeter and a yellow index of the molded article measured using a colorimeter after the molded article is left at 170° C. for 150 hours (ΔY) of 9 or less.

5. The polyester resin composition according to claim 4 , comprising:
about 40 wt % to about 75 wt % of the polyester resin (A);
about 15 wt % to about 50 wt % of the white pigment (B); and
about 10 wt % to about 30 wt % of the reflectance retention agent (C).

6. The polyester resin composition according to claim 5 , comprising:
about 50 wt % to about 70 wt % of the polyester resin (A);
about 15 wt % to about 25 wt % of the white pigment (B); and
about 10 wt % to about 30 wt % of the reflectance retention agent (C).

7. The polyester resin composition according to claim 4 , wherein the (B) white pigment comprises titanium oxide, zinc oxide, zinc sulfide, white lead, zinc sulfate, barium sulfate, calcium carbonate, aluminum oxide, or a combination thereof.

8. The polyester resin composition according to claim 4 , wherein the (B) white pigment has a particle size of about 0.05 μm to about 2.0 μm.

9. The polyester resin composition according to claim 4 , wherein the (C) reflectance retention agent has an acicular shape having a ratio of length to particle diameter of about 5:1 to about 20:1.

10. The polyester resin composition according to claim 4 , comprising (C) about 15 wt % to about 40 wt % of the reflectance retention agent comprising an inorganic compound calcium silicate having a pH of 10.3 to about 11.

11. The polyester resin composition according to claim 4 , wherein a molded article manufactured from the polyester resin composition has a ratio of reflectance (R 2 ) of the molded article, as measured at a wavelength of 450 nm using a colorimeter after the molded article is left at 85° C. and 85% relative humidity (RH) for 300 hours, to initial reflectance (R 0 ) of the molded article, as measured at a wavelength of 450 nm using a colorimeter, (R 2 /R 0 ) of 0.96 or more.

12. The polyester resin composition according to claim 4 , wherein the molded article has a difference between an initial yellow index of the molded article measured using a colorimeter and a yellow index of the molded article measured using a colorimeter after the molded article is left at 170° C. for 150 hours (ΔY) of 8.8 or less.

13. A molded article manufactured from the polyester resin composition according to claim 4 .

14. The molded article according to claim 13 , wherein the molded article has a reflectance of 89 or more, as measured at a wavelength of 450 nm using a colorimeter after the molded article is left at 85° C. and 85% relative humidity (RH) for 300 hours.

15. The molded article according to claim 13 , wherein the molded article is a reflector for light emitting diodes (LEDs).

Assignees

• Lotte Advanced Mat Co Ltd

Inventors

• Kim Yang Il
• Kang Tae Gon
• Park Chan Moo
• Baek In Geol
• Hong Sang Hyun

Classifications

• C08K3/22 Primary

  of metals · CPC title

• C08K2003/2241

  Titanium dioxide · CPC title

• C08K2201/003

  Additives being defined by their diameter · CPC title

• C08K3/34 Primary

  Silicon-containing compounds · CPC title

• C08K7/14

  Glass · CPC title