Polyester Resin Composition Having Improved Mechanical Properties and Moldability

• US 20190319177A1
• Filed: 06/25/2019
• Published: 10/17/2019
• Est. Priority Date: 04/01/2014
• Status: Active Grant

• Current Assignee: Lotte Chemical Corporation
• Original Assignee: Lotte Advanced Materials Co., Ltd. (Lotte Chemical Corporation)
• Inventors: KANG, Tae Gon, PARK, Chan Moo, JUNG, Yoo Jin, LIM, Jong Cheol, HONG, Sang Hyun, KIM, Tae Soo, PARK, Young Ho
• Granted Patent: US 10,998,477 B2
• Time in Patent Office: Days
• CPC Class Codes: C08K 2003/2241 Titanium dioxide
• CPC Class Codes: C08K 3/013 Fillers, pigments or reinforcing additives
• CPC Class Codes: C08K 3/22 of metals
• CPC Class Codes: C08K 3/346 Clay
• CPC Class Codes: C08K 7/14 Glass
• CPC Class Codes: C08L 67/02 Polyesters derived from dicarboxylic acids and dihydroxy compounds C08L67/06 takes precedence
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2933/0033 relating to semiconductor body packages
• CPC Class Codes: H01L 2933/0058 relating to optical field-shaping elements
• CPC Class Codes: H01L 33/60 Reflective elements

Abstract

A polyester resin composition includes: (A) a polyester resin which includes a polymer of a dicarboxylic acid component including an aromatic dicarboxylic acid and a diol component including an alicyclic diol having a trans/cis isomer ratio of about 2.3 or more; (B) a white pigment; and (C) inorganic fillers. A molded article formed from the polyester resin composition can exhibit improved mechanical properties and moldability, and thus can be suitable for light emitting diode (LED) reflectors.

Claims

1. A polyester resin composition comprising:

(A) a polyester resin which includes a polymer of a dicarboxylic acid component comprising an aromatic dicarboxylic acid and a diol component comprising an alicyclic diol having a trans/cis isomer ratio of 2.5 to about 5;

(B) a white pigment, wherein the white pigment is titanium dioxide; and

(C) inorganic fillers, wherein the inorganic fillers are glass fibers.

2. The polyester resin composition according to claim 1, wherein the polyester resin comprises a repeat unit represented by Formula 1:

3. The polyester resin composition according to claim 2, wherein the polyester resin composition comprises:

about 10 wt % to about 80 wt % of the (A) polyester resin;

about 5 wt % to about 60 wt % of the (B) white pigment; and

about 1 wt % to about 40 wt % of the (C) inorganic fillers.

4. The polyester resin composition according to claim 1, wherein the diol component comprising the alicyclic diol of the polyester resin (A) has a trans/cis isomer ratio of about 2.8 to about 5.

5. The polyester resin composition according to claim 1, wherein the polyester resin is polycyclohexylenedimethylene terephthalate (PCT) resin.

6. The polyester resin composition according to claim 5, comprising:

about 40 wt % to about 70 wt % of the (A) polyester resin;

about 15 wt % to about 40 wt % of the (B) white pigment; and

about 10 wt % to about 20 wt % of the (C) inorganic fillers.

7. A molded article formed from the polyester resin composition according to claim 1.

8. The molded article according to claim 7, wherein the molded article is a reflector for a light emitting diode (LED).

9. The molded article according to claim 7, wherein the molded article is a reflector cup for a light emitting diode (LED).