US4410647A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Epoxy composition and sealing of integrated circuit modules therewith
Assignee: International Business Machines Corp
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Filing: 1980-11-28
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Granted: 1983-10-18
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Expires: 2000-11-28
Abstract
Abstract A composition containing an epoxy polymer, 4,4'(2-acetoxy-1,3 glyceryl)bis anhydro trimellitate; a polyanhydride; and a solid filler; method of preparation, and the sealing of integrated circuit modules therewith are provided.
Inventors
- 👤 John R. Susko
- 👤 Robin A. Wheater
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:02
CPC Classifications
H; H10; H10W; H10W76/00; H10W76/60; C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/42; C08G59/4223; C08G67/00; C08G67/04; C09; C09J; C09J163/00; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/40; C08L; C08L2666/00; C08L2666/54; H10W90/00; H10W90/701; H10W90/721; H10W90/724
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
84 words
A composition containing: A. about 50-65% by weight of an epoxy polymer having an epoxy equivalent of at least about 400; B. about 2-15% by weight of 4,4'-(2-acetoxy-1,3-glyceryl)-bis anhydrotrimellitate; C. about 2-15% by weight of a polyanhydride solid at room temperature having the formula: ##STR13## wherein m is a whole number integer of 4-8 and n is an integer such that said polyanhydride is solid at room temperature; and D. about 10-45% of a solid filler having a particle size of about 5-50 microns.
Claim 2
Dependent Claim
84 words
A composition containing: A. about 50-65% by weight of an epoxy polymer having an epoxy equivalent of at least about 400; B. about 2-15% by weight of 4,4'-(2-acetoxy-1,3-glyceryl)-bis anhydrotrimellitate; C. about 2-15% by weight of a polyanhydride solid at room temperature having the formula: ##STR13## wherein m is a whole number integer of 4-8 and n is an integer such that said polyanhydride is solid at room temperature; and D. about 10-45% of a solid filler having a particle size of about 5-50 microns.
Claim 3
Dependent Claim
16 words
The composition of claim 1 wherein said epoxy polymer includes glycidyl ether of epichlorohydrin and bisphenol-A.
Claim 4
Dependent Claim
30 words
The composition of claim 1 wherein said epoxy polymer has an epoxy equivalent weight of up to about 700, and a melting point of about 75° to about 90° C.
Claim 5
Dependent Claim
31 words
The composition of claim 1 wherein said epoxy polymer has an epoxy equivalent weight of about 600 to about 700, and a melting point of about 75° to about 85° C.
Claim 6
Dependent Claim
19 words
The composition of claim 1 wherein the amount of said trimellitate is about 5 to about 10% by weight.
Claim 7
Dependent Claim
31 words
The composition of claim 1 wherein said polyanhydride is from the group of polyadipic polyanhydride; polyazelic polyanhydride; or polysebacic polyanhydride, and wherein the molecular weight is about 750 to about 1700.
Claim 8
Dependent Claim
22 words
The composition of claim 1 wherein said polyanhydride includes polysebacic polyanhydride having an average molecular weight of about 1600 to about 1700.
Claim 9
Dependent Claim
18 words
The composition of claim 1 wherein the amount of said polyanhydride is about 5 to 10% by weight.
Claim 10
Dependent Claim
10 words
The composition of claim 1 wherein said filler is silica.
Claim 11
Dependent Claim
14 words
The composition of claim 9 wherein said silica has a coating of silane thereon.
Claim 12
Dependent Claim
20 words
The composition of claim 1, 9 or 10 wherein the amount of said filler is about 20 to about 25%.
Claim 13
Dependent Claim
19 words
The composition of claim 1, 9 or 10 wherein the particle size of said filler is about 10-20 microns.
Claim 14
Dependent Claim
17 words
The composition of claim 10 wherein said silane is gamma glycidoxy propyltrimethoxy silane or gamma aminopropyltriethoxy silane.
Claim 15
Dependent Claim
12 words
The composition of claim 1 being in powdered form or compressed preform.
Claim 16
Dependent Claim
17 words
The composition of claim 1 which further contains up to about 1% by weight of a pigment.
Claim 17
Dependent Claim
12 words
The composition of claim 15 wherein said pigment is copper phthalocyanine blue.
Claim 18
Dependent Claim
70 words
A method for preparing the composition of claim 1 which comprises: A. admixing said epoxy and said solid filler at temperatures of about 140° to about 160° C. until a uniform melt is obtained; B. cooling the melt to about 65° to 75° C.; C. admixing said trimellitate and said polyanhydride into the melt while maintaining the temperature at about 65° to about 75° C.; and D. cooling the composition.
Claim 19
Dependent Claim
34 words
The composition of claim 1 wherein n is such that said polyanhydride has a melting point of about 50° to about 85° C. and an average molecular weight of about 750 to about 1700.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-17 | 1987-04-18 | 1987-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-17 | 1991-04-18 | 1991-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-17 | 1995-04-18 | 1995-10-18 | $7700.00 | Window Closed / Lapsed |