Liquid crystalline polymer composition and molded article produced therefrom

Patent metadata

Field	Value
Publication number	US-12448569-B2
Application number	US-202218686535-A
Country	US
Kind code	B2
Filing date	Aug 19, 2022
Priority date	Aug 27, 2021
Publication date	Oct 21, 2025
Grant date	Oct 21, 2025

Abstract

A liquid crystalline polymer composition of the present invention comprises: about 10-50% by weight of a liquid crystalline polymer, about 20-60% by weight of an aromatic sulfone polymer, and about 10-50% by weight of an inorganic filler having a pH of about 7-12. The liquid crystalline polymer composition has excellent fluidity, rigidity, and abrasion resistance, and generates little dust.

First claim

The invention claimed is:

1. A liquid crystalline polymer composition comprising:
10 wt % to 50 wt % of a liquid crystalline polymer;
20 wt % to 60 wt % of an aromatic sulfone polymer; and
10 wt % to 50 wt % of inorganic fillers having a pH of 7 to 12.

2. The liquid crystalline polymer composition according to claim 1 , wherein the liquid crystalline polymer has a crystalline melting point of 280° C. to 380° C.

3. The liquid crystalline polymer composition according to claim 1 , wherein the aromatic sulfone polymer comprises repeat units represented by Formula 1:

where Ar 1 and Ar 2 are each independently a C 6 to C 20 arylene group.

4. The liquid crystalline polymer composition according to claim 1 , wherein the aromatic sulfone polymer comprises at least one of a polysulfone comprising repeat units represented by Formula 1a, a polyphenylsulfone comprising repeat units represented by Formula 1b, and a polyethersulfone comprising repeat units represented by Formula 1c:

5. The liquid crystalline polymer composition according to claim 1 , wherein the inorganic fillers having a pH of 7 to 12 comprises at least one of calcium silicate and magnesium silicate.

6. The liquid crystalline polymer composition according to claim 1 , wherein the liquid crystalline polymer and the aromatic sulfone polymer are present in a weight ratio of 1:0.7 to 1:3.5.

7. The liquid crystalline polymer composition according to claim 1 , wherein the liquid crystalline polymer and the inorganic fillers having a pH of 7 to 12 are present in a weight ratio of 1:0.4 to 1:3.

8. The liquid crystalline polymer composition according to claim 1 , wherein the aromatic sulfone polymer and the inorganic fillers having a pH of 7 to 12 are present in a weight ratio of 1:0.3 to 1:2.5.

9. The liquid crystalline polymer composition according to claim 1 , wherein the liquid crystalline polymer composition has a spiral flow length of 170 mm to 200 mm, as measured on a specimen prepared by injection molding in a spiral-shaped mold having a width of 10 mm and a thickness of 2 mm under conditions of a molding temperature of 370° C., a mold temperature of 120° C., an injection pressure of 160 MPa, and an injection speed of 100 mm/s.

10. The liquid crystalline polymer composition according to claim 1 , wherein the liquid crystalline polymer composition has a tensile strength of 800 kgf/cm 2 to 1,000 kgf/cm 2 , as measured on a 3.2 mm thick specimen in accordance with ASTM D638.

11. The liquid crystalline polymer composition according to claim 1 , wherein the liquid crystalline polymer composition generates 0.1 mg to 0.6 mg of dust, as measured on a 1.2 mm thick rib specimen prepared from the liquid crystalline polymer after a boss specimen prepared from the liquid crystalline polymer composition and fastened with an M3 screw is reciprocated on an upper surface of the rib specimen at a rate of 50 strokes/min under a load of 2.5 kg for 2 hours.

12. A molded article produced from the liquid crystalline polymer composition according to claim 1 .

13. The molded article according to claim 12 , wherein the molded article is a compact camera module part.

Assignees

• Lotte Chemical Corp

Inventors

• Kim Yang Il
• Arifin Eric
• Lee Jung Hun
• Jin Young Sub
• Lee Bong Jae

Classifications

• C09K2019/521

  Inorganic solid particles · CPC title

• C09K19/52 Primary

  characterised by components which are not liquid crystals, e.g. additives {with special physical aspect: solvents, solid particles} · CPC title

• C08L81/06 Primary

  Polysulfones; Polyethersulfones · CPC title

• C08K3/34

  Silicon-containing compounds · CPC title

• C08L101/12

  characterised by physical features, e.g. anisotropy, viscosity or electrical conductivity (liquid crystal materials or compositions C09K19/00) · CPC title