Liquid crystalline polymer compositions containing small particle size fillers

• US 20030212187A1
• Filed: 06/17/2003
• Published: 11/13/2003
• Est. Priority Date: 01/13/2000
• Status: Active Grant

• Current Assignee: Ticona LLC (Celanese Corporation)
• Original Assignee: Steve G. Cottis
• Inventors: Cottis, Steve G.
• Granted Patent: US 6,861,463 B2
• Time in Patent Office: Days
• US Class Current: 524/492
• 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;

inert filler, in an amount between about 15 and about 55 weight percent of the composition; and

small particle size filler having a mean particle size less than about 50 nanometers, in an amount between about 0.5 and about 5 weight percent of the composition.

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

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

6. The composition of claim 1, wherein said inert filler has a mean particle size of about 30 microns or less.

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

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

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