Thermotropic liquid crystal polymer composition and insulator

• US 5,459,190 A
• Filed: 08/03/1994
• Issued: 10/17/1995
• Est. Priority Date: 01/29/1992
• Status: Expired due to Fees

• Current Assignee: Ebara Corporation
• Original Assignee: Ebara Corporation
• Inventors: Nakamura, Toshio, Iwata, Minoru, Miyasaka, Toshifumi, Soeda, Yoshimi
• Primary Examiner(s): Yoon, Tae H.
• Application Number:
  US08/285,277
• Time in Patent Office: 440 Days
• Field of Search: 524/443, 264/328.1, 252/299.01, 523/513, 523/521
• US Class Current: 524/443
• CPC Class Codes: C08K 3/34 Silicon-containing compounds
• CPC Class Codes: C08L 67/00 Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain of polyester-amides C08L77/12; of polyester-imides C08L79/08; Compositions of derivatives of such polymers
• CPC Class Codes: C09K 19/3809 Polyesters; Polyester derivatives, e.g. polyamides
• CPC Class Codes: H02K 5/08 Insulating casings

Abstract

The improved thermotropic LCP composition comprises 10-13 wt % of a thermotropic liquid crystal polymer resin and 90-87 wt % of zircon and is useful as an electrical insulator. The composition is a good electrical insulator, permits good heat conduction and experiences small thermal expansion, thus insuring high reliability. The composition may be injection molded to form an electrically insulated housing of a stator for electric machines or appliances that includes a coil and terminals thereof.

Claims

1. An electrical insulator prepared by the steps of:

first mixing from about 10-13 percent by weight of a thermotropic liquid crystal polymer resin and correspondingly from about 90-87 percent by weight of zircon comprising particles of about 1-60 μ

m in size while heating at a temperature of about 260°

-330°

C. to form pellets having a homogeneous thermotropic liquid crystal polymer composition; and

thereafter performing injection molding with the pellets at a temperature of about 260°

-330°

C. under a pressure of 400-1400 kfg/cm².

3. The electrical insulator of claim 1, in the form of a stator.

2. A thermotropic liquid crystal polymer composition comprising from about 10-13 percent by weight of a thermotropic liquid crystal polymer resin and correspondingly from about 90-87 percent by weight of zircon comprising particles of about 1-60 μ

m in size.