US6162849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermally conductive thermoplastic
Assignee: Vibrantz Corp
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Filing: 1999-01-11
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Granted: 2000-12-19
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Expires: 2019-01-11
Abstract
Abstract This invention relates to a thermally conductive moldable polymer blend comprising a thermoplastic polymer having a tensile at yield of at least 10,000 psi; at least 60% by weight of a mixture of boron nitride powders having an average particle size of at least 50 microns; and a coupling agent. The composition displays a thermal conductivity of at least about 15 W/m° K and it is capable of being molded using high speed molding techniques such as injection molding.
Inventors
- 👤 Qizhuo Zhuo
- 👤 Ronald M. Harris
- 👤 Dennis C. Skovran
- 👤 Leo F. Lightner
- 👤 Michael S. Randall
- 👤 Vernon E. Stygar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 11:20
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/38; C08K2003/382; C08K2003/385
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
129 words
A thermally conductive and moldable thermoplastic composition having a thermal conductivity of at least 15 W/m° K comprising a base thermoplastic resin, at least about 60% by weight boron nitride filler and a coupling agent, said base thermoplastic resin comprising a material having a tensile at yield of at least 10,000 psi selected from the group consisting of liquid crystal polymers and thermoplastic polyesters, and said boron nitride filler comprising from about 10% to about 40% by volume particles that display an average particle size of from about 5 to about 25 microns, from about 60% to about 90% by volume particles having an average particle size of from about 40 to about 80 microns, and in total particles having an average particle size of at least 50 microns.
Claim 2
Dependent Claim
129 words
A thermally conductive and moldable thermoplastic composition having a thermal conductivity of at least 15 W/m° K comprising a base thermoplastic resin, at least about 60% by weight boron nitride filler and a coupling agent, said base thermoplastic resin comprising a material having a tensile at yield of at least 10,000 psi selected from the group consisting of liquid crystal polymers and thermoplastic polyesters, and said boron nitride filler comprising from about 10% to about 40% by volume particles that display an average particle size of from about 5 to about 25 microns, from about 60% to about 90% by volume particles having an average particle size of from about 40 to about 80 microns, and in total particles having an average particle size of at least 50 microns.
Claim 3
Dependent Claim
26 words
The composition of claim 1 wherein said base thermoplastic resin comprises a liquid crystal polymer that displays a T m of at least about 250° C.
Claim 4
Dependent Claim
24 words
The composition of claim 1 wherein said base thermoplastic resin comprises a thermoplastic polyester that displays a T g of at least 100° C.
Claim 5
Dependent Claim
18 words
The composition of claim 1 wherein said composition displays a thermal conductivity of at least 18 W/m° K.
Claim 6
Dependent Claim
18 words
The composition of claim 1 wherein said composition displays a thermal conductivity of at least 20 W/m° K.
Claim 7
Dependent Claim
20 words
The composition of claim 1 wherein said composition displays a volume resistivity of at least about 10 16 Ohm cm.
Claim 8
Dependent Claim
24 words
The composition of claim 1 wherein said base thermoplastic resin displays a melt processing temperature of from about 450° F. to about 600° F.
Claim 9
Dependent Claim
15 words
The composition of claim 1 wherein said boron nitride filler displays a hexagonal crystal structure.
Claim 10
Dependent Claim
19 words
The composition of claim 1 wherein said composition displays a flammability rating of V-O pursuant to UL-94 test procedures.
Claim 11
Dependent Claim
22 words
The composition of claim 1 wherein said thermoplastic base resin comprises from about 15% to about 40% by weight of said composition.
Claim 12
Dependent Claim
20 words
The composition of claim 1 wherein said boron nitride filler comprises at least about 65% by weight of said composition.
Claim 13
Dependent Claim
20 words
The composition of claim 1 wherein said boron nitride filler comprises at least about 70% by weight of said composition.
Claim 14
Dependent Claim
21 words
The composition of claim 1 wherein said coupling agent comprises from about 0.1% to about 5% by weight of said composition.
Claim 15
Dependent Claim
13 words
The composition of claim 3 wherein said base thermoplastic resin comprises polyethylene naphthalate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-12-19 | 2004-06-19 | 2004-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-12-19 | 2008-06-19 | 2008-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-12-19 | 2012-06-19 | 2012-12-19 | $7700.00 | Window Closed / Lapsed |