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US4582748A
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Glass compositions having low expansion and dielectric constants
Assignee: Advanced Glassfiber Yarns LLC
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Filing: 1984-01-26
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Granted: 1986-04-15
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Expires: 2004-01-26
Abstract
Abstract Glass fibers having suitable properties for reinforcing electrical laminates have a defined viscosity-liquidus relationship, a low coefficient of thermal expansion, a high elastic modulus, and a low dielectric constant.
Inventors
- 👤 Walter L. Eastes
- 👤 Don S. Goldman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:29
CPC Classifications
C; C03; C03C; C03C13/00; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249924; Y10T428/24994
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
157 words
A magnesia boroaluminosilicate glass fiber consisting essentially of, in approximate weight percent, 50-65% by weight SiO 2 , 10-25% Al 2 O 3 , 5-15% B 2 O 3 and less than 15% MgO, said glass fiber optionally including less than 5% TiO 2 and less than 5% ZnO, the weight ratio of Al 2 O 3 /MgO being from 2.0 to 2.5, the composition being selected such that said glass fiber has a coefficient of thermal expansion of from about 1 to about 2.3 (ppm/K), an elastic modulus greater than about 10 (M psi), a dielectric constant of less than about 6, a viscosity (in poise) of 10 to the 2.5 power at a temperature between about 2790° F. and about 2830° F., and a liquidus temperature between about 2300° F. to about 2500° F., the liquidus temperature being 300° F. or more below the temperature at which glass has viscosity of 10 2 .5 poise.
Claim 2
Dependent Claim
157 words
A magnesia boroaluminosilicate glass fiber consisting essentially of, in approximate weight percent, 50-65% by weight SiO 2 , 10-25% Al 2 O 3 , 5-15% B 2 O 3 and less than 15% MgO, said glass fiber optionally including less than 5% TiO 2 and less than 5% ZnO, the weight ratio of Al 2 O 3 /MgO being from 2.0 to 2.5, the composition being selected such that said glass fiber has a coefficient of thermal expansion of from about 1 to about 2.3 (ppm/K), an elastic modulus greater than about 10 (M psi), a dielectric constant of less than about 6, a viscosity (in poise) of 10 to the 2.5 power at a temperature between about 2790° F. and about 2830° F., and a liquidus temperature between about 2300° F. to about 2500° F., the liquidus temperature being 300° F. or more below the temperature at which glass has viscosity of 10 2 .5 poise.
Claim 3
Dependent Claim
12 words
A laminate comprising the magnesia boroaluminosilicate glass fiber defined in claim 1.
Claim 4
Dependent Claim
16 words
The laminate of claim 2 in combination with a ceramic chip and forming an integrated circuit.
Claim 5
Dependent Claim
83 words
The glass fiber of claim 1 consisting essentially in parts by weight of about 62 parts silicon dioxide, about 20 parts aluminum oxide, about 8 parts magnesium oxide, and about 10 parts boric oxide, said glass fiber having a viscosity (in poise) of 10 to the 2.5 power at a temperature of about 2828° F., a liquidus temperature of about 2477° F., a coefficient of thermal expansion of about 2.1, a dielectric constant of about 5 and an elastic modulus of about 10.3.
Claim 6
Dependent Claim
95 words
The glass fiber of claim 1 consisting essentially in parts by weight of about 62 parts silicon dioxide, about 16 parts aluminum oxide, about 8 parts magnesium oxide, about 8 parts of boron oxide, about 3 parts titanium dioxide and about 3 parts zinc oxide, wherein said glass fiber has a viscosity (in poise) of 10 to the 2.5 power at a temperature of about 2794° F., a liquidus temperature of about 2301° F., a coefficient of thermal expansion of about 1.7, a dielectric constant of about 5 and an elastic modulus of about 14.2.
Claim 7
Dependent Claim
15 words
A glass fiber-filled substrate comprising the magnesia boroaluminosilicate glass fiber of claim 4 or 5.
Claim 8
Dependent Claim
18 words
The glass fiber-filled substrate of claim 6 in combination with a ceramic chip and forming an integrated circuit.
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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) | 1989-04-14 | 1989-10-14 | 1990-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-14 | 1993-10-14 | 1994-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-14 | 1997-10-14 | 1998-04-15 | $7700.00 | Window Closed / Lapsed |