Liquid crystalline polymer compositions containing small particle size fillers

• US 6,861,463 B2
• Filed: 06/17/2003
• Issued: 03/01/2005
• Est. Priority Date: 01/13/2000
• Status: Expired due to Fees

• Current Assignee: Ticona LLC (Celanese Corporation)
• Original Assignee: E. I. du Pont de Nemours and Company (Corteva, Inc.)
• Inventors: Cottis, Steve G.
• Primary Examiner(s): WYROZEBSKI LEE, KATARZYNA I
• Application Number:
  US10/464,316
• Publication Number:
  US 20030212187A1
• Time in Patent Office: 623 Days
• Field of Search: 524/430, 524/423, 524/493, 524/497, 252/299.1
• US Class Current: 524/493
• CPC Class Codes: C08K 2201/014 Additives containing two or more different additives of the same subgroup in C08K
• CPC Class Codes: C08K 3/22 of metals
• CPC Class Codes: C08K 3/30 Sulfur-, selenium- or tellurium-containing compounds
• CPC Class Codes: C08K 3/36 Silica

Abstract

Compositions comprising liquid crystalline polymer; inert filler; and small particle size filler having a mean particle size less than about 50 nanometers. These blends have excellent adhesion and low surface roughness properties and can be used as molded articles in electronics or electrical applications.

Claims

1. A composition comprising:

liquid crystalline polymer, in an amount between about 40 and about 85 weight percent of the composition;

an inert filler component, in an amount between about 15 and about 55 weight percent of the composition, wherein the inert filler has an average particle size of about 30 microns or less in the longest direction; and

a small particle size filler component having a mean particle size of about 50 nanometers or less, in an amount between about 0.5 and about 5 weight percent of the composition, wherein the small particle size filler component is selected from TiO₂, SiO₂, Al₂O₃, or Al₂SiO₃.

2. The composition of claim 1, wherein said inert filler component comprises at least one of SiO₂, CaSO₄, CaSO₄ whiskers, Al₂O₃, or TiO₂.

3. The composition of claim 2, wherein said inert filler component comprises at least one of SiO₂, TiO₂, or Al₂O₃.

4. The composition of claim 3, wherein said SiO₂ comprises fused SiO₂.

5. The composition of claim 3, wherein said TiO₂ comprises a chloride process rutile TiO₂.

6. The composition of claim 1, wherein said small particle size filler component has a mean particle size of about 40 nanometers or less.

7. The composition of claim 1, wherein said small particle size filler component has a mean particle size of about 30 nanometers or less.

8. The composition of claim 1, wherein said small particle size filler component comprises titanium dioxide.