Patent US5024975A successfully refreshed from Google Patents.
US5024975A
Expired / Lapsed
US
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Crystallizable, low dielectric constant, low dielectric loss composition
Assignee: EIDP Inc
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Filing: 1989-10-19
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Granted: 1991-06-18
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Expires: 2009-10-19
Abstract
Abstract A variable TCE composition for making dielectric layers having low dielectric constant and low dielectric loss, the composition comprising an admixture of finely divided solids comprising amorphous crystallizable glass, amorphous borosilicate frit, ceramic expansion control additive, and crystallization control additive. The dielectric layers are useful in circuits especially for high density and high frequency applications.
Inventors
- 👤 Hans S. Hartmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:37
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/02; H01B3/08; H01B3/087; C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/089; C03C3/091; C03C8/00; C03C8/14; C03C8/22; H01B3/085; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0306; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24917
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
123 words
A composition for making low K, low dielectric loss dielectric layers, said composition comprising an admixture of finely divided solids comprising: (a) 20-80% by weight, basis total solids, amorphous crystallizable glass; (b) 20-60% by weight, basis total solids, amorphous borosilicate glass (1) in which the weight ratio of B 2 O 3 to SiO 2 is 0.22-0.55, and (2) containing, basis total borosilicate glass, 0.2-1.0% by weight Al 2 O 3 , and 1.5-4.0% by weight of a mixture of oxides of alkali metals, alkaline earth metals or mixtures thereof, at least 0.5-1.2% by weight being Li 2 O; (c) 0.1 to 30% by weight, basis total solids, expansion control additive; and (d) 0.05 to less than 1.0% by weight crystallization control additive.
Claim 2
Dependent Claim
123 words
A composition for making low K, low dielectric loss dielectric layers, said composition comprising an admixture of finely divided solids comprising: (a) 20-80% by weight, basis total solids, amorphous crystallizable glass; (b) 20-60% by weight, basis total solids, amorphous borosilicate glass (1) in which the weight ratio of B 2 O 3 to SiO 2 is 0.22-0.55, and (2) containing, basis total borosilicate glass, 0.2-1.0% by weight Al 2 O 3 , and 1.5-4.0% by weight of a mixture of oxides of alkali metals, alkaline earth metals or mixtures thereof, at least 0.5-1.2% by weight being Li 2 O; (c) 0.1 to 30% by weight, basis total solids, expansion control additive; and (d) 0.05 to less than 1.0% by weight crystallization control additive.
Claim 3
Dependent Claim
12 words
The composition of claim 1 wherein the crystallization control additive is polycrystalline.
Claim 4
Dependent Claim
22 words
The composition of claim 2 wherein the polycrystalline crystallization control additive and the amorphous crystallizable glass consist essentially of the same composition.
Claim 5
Dependent Claim
56 words
The composition of claim 3 wherein the amorphous crystallizable glass is selected from the group consisting of compositions of MgO, Al 2 O 3 , and SiO 2 that lie in the crystallization field of cordierite and compositions of CaO, Al 2 O 3 , and SiO 2 that lie in the crystallization field of anorthite.
Claim 6
Dependent Claim
22 words
The composition of claim 4 wherein 0.1-0.5% by weight, based on the amorphous crystallizable glass, of the crystallization control additive is present.
Claim 7
Dependent Claim
26 words
The composition of claim 5 wherein the expansion control additive is selected from the group consisting of alumina, quartz, stabilized cristobalite, aluminum phosphate, and mixtures thereof.
Claim 8
Dependent Claim
15 words
The composition of claim 6 wherein the expansion control additive is quartz or stabilized cristobalite.
Claim 9
Dependent Claim
37 words
The composition of claim 7 wherein the borosilicate glass (a) comprises on a weight basis, 71.5% SiO 2 25.5% B 2 O 3 , 1% K 2 O, 1% Li 2 O and 0.25% Na 2 O.
Claim 10
Dependent Claim
21 words
A tape casting composition comprising the composition of claim 1 dispersed in a polymeric binder/plasticizer matrix in a volatile organic solvent.
Claim 11
Dependent Claim
21 words
A tape casting composition comprising the composition of claim 4 dispersed in a polymeric binder/plasticizer matrix in a volatile organic solvent.
Claim 12
Dependent Claim
21 words
A tape casting composition comprising the composition of claim 10 dispersed in a polymeric binder/plasticizer matrix in a volatile organic solvent.
Claim 13
Dependent Claim
21 words
An unfired tape formed by casting onto a flexible substrate a thin layer of the tape casting composition of claim 9.
Claim 14
Dependent Claim
21 words
An unfired tape formed by casting onto a flexible substrate a thin layer of the tape casting composition of claim 10.
Claim 15
Dependent Claim
21 words
An unfired tape formed by casting onto a flexible substrate a thin layer of the tape casting composition of claim 11.
Claim 16
Dependent Claim
13 words
A dielectric substrate comprising a fired layer of the tape of claim 12.
Claim 17
Dependent Claim
12 words
The dielectric substrate of claim 15 further comprising a ceramic base layer.
Claim 18
Dependent Claim
14 words
The dielectric substrate of claim 16 wherein the ceramic base layer comprises aluminum nitride.
Claim 19
Dependent Claim
15 words
An assemblage comprising the dielectric substrate of claim 15 and an electrically functional metallized layer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1994-06-17 | 1994-12-17 | 1995-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-17 | 1998-12-17 | 1999-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-17 | 2002-12-17 | 2003-06-18 | $7700.00 | Window Closed / Lapsed |