Thermally conductive elastomer

• US 5,194,480 A
• Filed: 05/24/1991
• Issued: 03/16/1993
• Est. Priority Date: 05/24/1991
• Status: Expired due to Fees

• Current Assignee: Parker Intangibles LLC (Parker-Hannifin Corporation)
• Original Assignee: W R Grace & Company - CONN (WR Grace & Company)
• Inventors: Morgan, Charles R., Block, Jacob, Rice, Roy W.
• Primary Examiner(s): Michl, Paul R.
• Assistant Examiner(s): YOON, TAE H
• Application Number:
  US07/705,482
• Time in Patent Office: 662 Days
• Field of Search: 524/404, 524/428, 524/430, 524/433
• US Class Current: 524/404
• CPC Class Codes: C08K 2003/2227 of aluminium
• CPC Class Codes: C08K 3/22 of metals
• CPC Class Codes: C08K 3/28 Nitrogen-containing compounds
• CPC Class Codes: C08K 3/38 Boron-containing compounds
• CPC Class Codes: C08L 53/00 Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers

Abstract

Thermoplastic rubber is used as part of a thermally conductive electrically insulating filled elastomer composition. The filler may be any conventional filler such as hexagonal boron nitride or alumina. The thermoplastic rubber may be crosslinked. The filled elastomer can be molded or pressed into desired shapes.

Claims

1. A thermally conductive electrically insulating filled elastomer composition comprising:

a) a styrene-ethylene-butylene-styrene block copolymer thermoplastic elastomer, and

b) about 45-70 vol. % thermally conductive electrically insulating filler particles.

2. The composition of claim 1 wherein said filler includes particles of material selected from the group consisting of hexagonal boron nitride, α

-alumina, magnesia and aluminum nitride.

3. The composition of claim 1 wherein said elastomer is crosslinkable thermoplastic elastomer.

4. The composition of claim 3 further comprising a crosslinking agent and catalyst for crosslinking said elastomer.

5. The composition of claim 2 wherein said filler is boron nitride which forms about 65-80 wt. % of said composition.