Patent US3658291A successfully refreshed from Google Patents.
Patent US5489641A successfully refreshed from Google Patents.
US5489641A
Expired / Lapsed
US
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Freeze resistant die-attach compositions
Assignee: QUANUM MATERIALS Inc
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Filing: 1993-02-26
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Granted: 1996-02-06
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Expires: 2013-02-26
Abstract
Abstract In accordance with the present invention, there is provided a novel composition for attaching a semiconductor device to a substrate. The invention composition comprises liquid monomer vehicle comprising at least two monomers wherein at least one monomer is a polycyanate ester monomer, electrically conductive filler, and a curing catalyst. Compositions of the invention remain homogeneous at room temperature for at least eight hours.
Inventors
- 👤 Stephen M. Dershem
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 02:53
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/20; H01B1/22; C; C08; C08G; C08G73/00; C08G73/06; C08G73/0622; C08G73/0638; C08G73/065; C08G73/0655; C08K; C08K3/00; C08K3/02; C08K3/08
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
66 words
A composition for attaching a semiconductor device to a substrate comprising: 8 to 20 wt. percent monomer vehicle comprising at least two monomers, wherein at least one monomer is a polycyanate ester monomer, and wherein said monomer vehicle is free of solvent; 80 to 92 wt. percent electrically conductive filler; and 50 to 1500 ppm metal catalyst; wherein said monomer vehicle is liquid under ambient conditions.
Claim 2
Dependent Claim
66 words
A composition for attaching a semiconductor device to a substrate comprising: 8 to 20 wt. percent monomer vehicle comprising at least two monomers, wherein at least one monomer is a polycyanate ester monomer, and wherein said monomer vehicle is free of solvent; 80 to 92 wt. percent electrically conductive filler; and 50 to 1500 ppm metal catalyst; wherein said monomer vehicle is liquid under ambient conditions.
Claim 3
Dependent Claim
47 words
A composition according to claim 1 wherein said liquid monomer vehicle is selected from: vehicles consisting essentially of liquid monomers, vehicles consisting essentially of solid monomer(s) miscible and/or soluble in liquid monomer(s), or vehicles consisting essentially of solid monomers which, when combined, provide a liquid monomer mixture.
Claim 4
Dependent Claim
16 words
A composition according to claim 2 wherein said liquid monomer vehicle consists essentially of liquid monomers.
Claim 5
Dependent Claim
22 words
A composition according to claim 2 wherein said liquid monomer vehicle consists essentially of solid monomer(s) miscible and/or soluble in liquid monomer(s).
Claim 6
Dependent Claim
24 words
A composition according to claim 2 wherein said liquid monomer vehicle consists essentially of solid monomers which, when combined, provide a liquid monomer mixture.
Claim 7
Dependent Claim
44 words
A composition for attaching a semiconductor device to a substrate comprising: 13 to 20 wt. percent monomer vehicle comprising 1,1bis(4-cyanatophenyl)ethane(I) and 2,2-bis(4-cyanatophenyl)propane(II), wherein said monomer vehicle is free of solvent; 80 to 87 wt. percent silver filler; and 50 to 500 ppm cobalt acetylacetonate.
Claim 8
Dependent Claim
44 words
A composition for attaching a semiconductor device to a substrate comprising: 13 to 20 wt. percent monomer vehicle comprising 1,1bis(4-cyanatophenyl)ethane(I) and 2,2-bis(4-cyanatophenyl)propane(II), wherein said monomer vehicle is free of solvent; 80 to 87 wt. percent silver filler; and 50 to 500 ppm cobalt acetylacetonate.
Claim 9
Dependent Claim
39 words
A composition according to claim 6 wherein said monomers comprise from about 80 to about 95 wt. percent (I) and from about 5 to about 20 wt. percent (II), with the combined percentages representing total wt. percent monomer vehicle.
Claim 10
Dependent Claim
34 words
A composition according to claim 1 wherein additional monomer is selected from the group consisting of vinyl ethers, divinyl ethers, propargyl allyl ethers, monomaleimides, bismaleimides and mixtures of any two or more such monomers.
Claim 11
Dependent Claim
19 words
A composition according to claim 4 wherein said liquid monomer vehicle consists essentially of 1,1-bis(4-cyanatophenyl)ethane and cyclohexanedimethanol monovinyl ether.
Claim 12
Dependent Claim
17 words
A composition according to claim 5 wherein said liquid monomer vehicle consists essentially of 1,1-bis(4-cyanatophenyl)ethane and 1,1-bis(propargyloxyphenyl)ethane.
Claim 13
Dependent Claim
26 words
A composition according to claim 5 wherein said liquid monomer vehicle comprises at least one monomer selected from 2,2,4-trimethylhexamethylene-1,6-bismaleimide, 1,1-bis(4-propargyloxyphenyl)ethane, 3-(2,2-dimethyltrimethylene acetal)-1-maleimidobenzene or 2,2-bis[4-(4-maleimidophenoxy)-phenyl]propane and 1,1-bis(4-cyanatophenyl)ethane.
Claim 14
Dependent Claim
16 words
A composition according to claim 5 wherein said liquid monomer vehicle comprises 2,2-bis(4-cyanatophenyl) propane and 1,1-bis(4-cyanatophenyl)ethane.
Claim 15
Dependent Claim
17 words
A composition according to claim 1 wherein additional monomer is selected from diallyl ethers or dipropargyl ethers.
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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) | 1999-02-05 | 1999-08-07 | 2000-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-02-05 | 2003-08-07 | 2004-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-02-05 | 2007-08-07 | 2008-02-06 | $7700.00 | Window Closed / Lapsed |