Patent US5348990A successfully refreshed from Google Patents.
US5348990A
Expired / Lapsed
US
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Low dielectric materials
Assignee: CNA Holdings LLC
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Filing: 1993-03-02
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Granted: 1994-09-20
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Expires: 2013-03-02
Abstract
Abstract A low dielectric material made of a liquid crystal polymer, polytetrafluoroethylene, and hollow glass spheres. This material is a relatively low cost, low dielectric blend having good physical strength and chemical and temperature resistance.
Inventors
- 👤 Lakshaman M. Walpita
- 👤 James B. Stamatoff
- 👤 George Lundberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:04
CPC Classifications
C; C09; C09K; C09K19/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/3154
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
48 words
A low dielectric material comprising at least about 30% by weight of a liquid crystal polymer, at least about 10% by weight polytetrafluoroethylene, and at least about 5% by weight hollow glass spheres, wherein said material has dielectric constant in the approximate range of from 1.1 to 3.4.
Claim 2
Dependent Claim
48 words
A low dielectric material comprising at least about 30% by weight of a liquid crystal polymer, at least about 10% by weight polytetrafluoroethylene, and at least about 5% by weight hollow glass spheres, wherein said material has dielectric constant in the approximate range of from 1.1 to 3.4.
Claim 3
Dependent Claim
23 words
A low dielectric material according to claim 1 wherein said liquid crystal polymer comprises repeating units derived from 4-hydroxybenzoic acid and 6-hydroxy-2-naphthoic acid.
Claim 4
Dependent Claim
23 words
A low dielectric material according to claim 1 wherein said liquid crystal polymer comprises from about 30 to about 60 percent by weight.
Claim 5
Dependent Claim
23 words
A low dielectric material according to claim 1 wherein said hollow glass spheres comprise from about 5 to about 30 percent by weight.
Claim 6
Dependent Claim
21 words
A low dielectric material according to claim 1 wherein said polytetrafluoroethylene comprises from about 10 to about 50 percent by weight.
Claim 7
Dependent Claim
55 words
A low dielectric material comprising: from about 30 to about 60 percent by weight of a liquid crystal polymer which comprises repeating units derived from 4-hydroxybenzoic acid and 6-hydroxy-2-naphthoic acid; from about 10 to about 50 percent by weight of polytetrafluoroethylene; and, from about 5 to about 40 percent by weight of hollow glass spheres.
Claim 8
Dependent Claim
55 words
A low dielectric material comprising: from about 30 to about 60 percent by weight of a liquid crystal polymer which comprises repeating units derived from 4-hydroxybenzoic acid and 6-hydroxy-2-naphthoic acid; from about 10 to about 50 percent by weight of polytetrafluoroethylene; and, from about 5 to about 40 percent by weight of hollow glass spheres.
Claim 9
Dependent Claim
49 words
A low dielectric material according to claim 6 wherein said liquid crystal polymer comprises from about 40 to about 55 weight percent, said polytetrafluoroethylene comprises from about 15 to about 35 weight percent, and said hollow glass spheres comprise about 10 to about 30 weight percent of said material.
Claim 10
Dependent Claim
57 words
A low dielectric material consisting essentially of: from about 30 to about 60 percent by weight of a liquid crystal polymer which comprises repeating units derived from 4-hydroxybenzoic acid and 6-hydroxy-2-naphthoic acid; from about 10 to about 50 percent by weight of polytetrafluoroethylene; and, from about 5 to about 40 percent by weight of hollow glass spheres.
Claim 11
Dependent Claim
57 words
A low dielectric material consisting essentially of: from about 30 to about 60 percent by weight of a liquid crystal polymer which comprises repeating units derived from 4-hydroxybenzoic acid and 6-hydroxy-2-naphthoic acid; from about 10 to about 50 percent by weight of polytetrafluoroethylene; and, from about 5 to about 40 percent by weight of hollow glass spheres.
Claim 12
Dependent Claim
14 words
A low dielectric material according to claim 8 in the form of a film.
Claim 13
Dependent Claim
17 words
A film according to claim 9 having a thickness of from about 2 to about 200 mils.
Claim 14
Dependent Claim
17 words
A film according to claim 9 having a thickness of from about 2 to about 100 mils.
Claim 15
Dependent Claim
17 words
A film according to claim 9 having a thickness of from about 5 to about 40 mils.
Claim 16
Dependent Claim
72 words
A process for making a low dielectric material according to claim 1 comprising the steps of: blending together approximately 30-60 parts by weight of a liquid crystal polymer and about 5-40 parts by weight of hollow glass spheres at a temperature in the approximate range of 280°-375° C. to form a mixture; and, subsequently blending about 10-50 parts by weight of polytetrafluoroethylene into said mixture at a temperature of about 280°-375° C.
Claim 17
Dependent Claim
16 words
A process according to claim 13 wherein in each step said temperature is about 280°-360° C.
Claim 18
Dependent Claim
52 words
A process for making a low dielectric material according to claim 1 comprising: blending together approximately 30-60 parts by weight of a liquid crystal polymer, about 10-50 parts by weight of polytetrafluoroethylene, and about 5-40 parts by weight of hollow glass spheres at a temperature in the approximate range of 280°-375° C.
Claim 19
Dependent Claim
13 words
A process according to claim 15 wherein said temperature is about 280°-360° C.
Claim 20
Dependent Claim
8 words
A film comprising the composition of claim 1.
Claim 21
Dependent Claim
17 words
A film according to claim 17 having a thickness of from about 2 to about 200 mils.
Claim 22
Dependent Claim
17 words
A film according to claim 17 having a thickness of from about 2 to about 100 mils.
Claim 23
Dependent Claim
17 words
A film according to claim 17 having a thickness of from about 5 to about 40 mils.
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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) | 1997-09-19 | 1998-03-21 | 1998-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-09-19 | 2002-03-21 | 2002-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-09-19 | 2006-03-21 | 2006-09-20 | $7700.00 | Window Closed / Lapsed |