Liquid-crystalline polymer composition

• US 8,696,932 B2
• Filed: 07/26/2012
• Issued: 04/15/2014
• Est. Priority Date: 07/27/2011
• Status: Active Grant

• Current Assignee: Ueno Fine Chemicals Industry Ltd.
• Original Assignee: Ueno Fine Chemicals Industry Ltd.
• Inventors: Uchida, Hiroto, Tsuchiya, Hitoshi
• Primary Examiner(s): Visconti, Geraldina
• Application Number:
  US13/559,191
• Publication Number:
  US 20130026413A1
• Time in Patent Office: 628 Days
• Field of Search: 252/299.01, 252/299.6, 252/299.62, 252/299.66, 428/1.1, 428/1.3, 349/167, 349/182
• US Class Current: 252/299.01
• CPC Class Codes: C09K 19/3809 Polyesters; Polyester derivatives, e.g. polyamides
• CPC Class Codes: C09K 2019/521 Inorganic solid particles
• CPC Class Codes: C09K 2323/00 Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
• CPC Class Codes: C09K 2323/03 Viewing layer characterised by chemical composition

Abstract

The present invention provides a liquid-crystalline polymer composition comprising: 100 parts by weight of a liquid-crystalline polymer and 1-150 parts by weight of the total weight of talc particles (A) and talc particles (B),

• • wherein
  • talc particles (A) have an aspect ratio of 3.1-5.0 and a median particle diameter of 5-100 μm; and
  • talc particles (B) have an aspect ratio of 1.0-3.0 and a median particle diameter of 5-100 μm;
  • wherein the weight ratio of talc particles (A)/talc particles (B) is from 1/9 to 9/1, and wherein the
    • liquid-crystalline polymer composition according to the present invention exhibits improved molding flowability without impairing mechanical properties.

Claims

1. A liquid-crystalline polymer composition comprising:

100 parts by weight of a liquid-crystalline polymer and 1-150 parts by weight of the total weight of talc particles (A) and talc particles (B),

wherein

talc particles (A) have an aspect ratio of 3.1-5.0 and a median particle diameter of 22-30 μ

m; and

talc particles (B) have an aspect ratio of 1.0-3.0 and a median particle diameter of 15-21 μ

m;

wherein the weight ratio of talc particles (A)/talc particles (B) is from 1/9 to 9/1.

2. The liquid-crystalline polymer composition according to claim 1, wherein the liquid-crystalline polymer is a wholly aromatic liquid-crystalline polyester resin.

3. The liquid-crystalline polymer composition according to claim 1, wherein the liquid-crystalline polymer is a liquid-crystalline polyester resin consisting of the repeating units represented by the formulae (I)-(IV):

4. The liquid-crystalline polymer composition according to claim 3, wherein Ar₁ and Ar₂ are one or more groups independently selected from the following aromatic groups (1)-(4)

5. The liquid-crystalline polymer composition according to claim 4, wherein Ar₁ is the aromatic group (1) and/or (4) defined in claim 4 and Ar₂ is the aromatic group (1) and/or (3) defined in claim 4.

6. The liquid-crystalline polymer composition according to claim 1, which further comprises 1-150 parts by weight of a fibrous, lamellar or powdery inorganic filler per 100 parts by weight of the liquid-crystalline polymer.

7. The liquid-crystalline polymer composition according to claim 6, wherein the inorganic filler is selected from the group consisting of glass fiber, milled glass, silica-alumina fiber, alumina fiber, carbon fiber, aramid fiber, potassium titanate whisker, aluminium borate whisker, wollastonite, mica, graphite, calcium carbonate, dolomite, clay, glass flake, glass beads, barium sulfate, titanium oxide and a combination thereof.

8. The liquid-crystalline polymer composition according to claim 6, wherein the inorganic filler is glass fiber.

9. A molded article obtained by molding the liquid-crystalline polymer composition according to claim 1.

10. The molded article according to claim 9, which is selected from the group consisting of switch, relay, connector, chip, optical pickup, inverter trans, coil bobbin, antenna and substrate.