Patent US4738892A successfully refreshed from Google Patents.
US4738892A
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Silica filler for epoxy encapsulants and epoxy encapsulants containing same
Assignee: PCR Inc
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Filing: 1985-09-27
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Granted: 1988-04-19
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Expires: 2005-09-27
Abstract
Abstract There is provided an improved silica filler for resins which silica filler is coated or reacted with an alkoxyepoxyterpene silane. The resins containing such filler are characterized by improved dielectric constant and dissipation factor.
Inventors
- 👤 Levy A. Canova
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:24
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/28; C09C1/30; C09C1/3081; C08; C08K; C08K9/00; C08K9/04; C08K9/06; C01; C01P; C01P2004/00; C01P2004/60; C01P2004/61; C01P2004/62; C01P2004/80; C01P2004/82; C01P2004/84; C01P2006/00; C01P2006/12; C01P2006/22; C01P2006/40; C01P2006/80; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2995
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
93 words
A silica filler having an average particle size in the range of 0.5 to 20 microns and a surface area of from 0.5 to 5 square meters per gram, the surface of said particles having coated thereon from 0.1% to about 2.5% by weight of an alkoxyepoxyterpene silane having the general formula: ##STR2## wherein R is C 1 -C 4 alkyl, R' is C 1 -C 4 alkyl and R" is a cyclic epoxyterpene radical or acyclic epoxyterpene radical connected to silicon through a silicon-carbon linkage, and n is 0, 1, or 2.
Claim 2
Dependent Claim
93 words
A silica filler having an average particle size in the range of 0.5 to 20 microns and a surface area of from 0.5 to 5 square meters per gram, the surface of said particles having coated thereon from 0.1% to about 2.5% by weight of an alkoxyepoxyterpene silane having the general formula: ##STR2## wherein R is C 1 -C 4 alkyl, R' is C 1 -C 4 alkyl and R" is a cyclic epoxyterpene radical or acyclic epoxyterpene radical connected to silicon through a silicon-carbon linkage, and n is 0, 1, or 2.
Claim 3
Dependent Claim
18 words
A silica filler as defined in claim 1 wherein R" contains 10 carbon atoms in the epoxyterpene radical.
Claim 4
Dependent Claim
12 words
A silica filler as defined in claim 1 wherein R is methyl.
Claim 5
Dependent Claim
12 words
A silica filler as defined in claim 1 wherein R is ethyl.
Claim 6
Dependent Claim
16 words
A silica filler as defined in claim 1 wherein R' is methyl and n is 1.
Claim 7
Dependent Claim
16 words
A silica filler as defined in claim 1 wherein R is methyl and n is 0.
Claim 8
Dependent Claim
16 words
A silica filler as defined in claim 1 wherein R is ethyl and n is 0.
Claim 9
Dependent Claim
12 words
A silica filler as defined in claim 1 wherein R" is dihydromyrcenyl-6,7-epoxide.
Claim 10
Dependent Claim
12 words
A silica filler as defined in claim 1 wherein R" is myrcenyl-6,7-epoxide.
Claim 11
Dependent Claim
12 words
A silica filler as defined in claim 1 wherein R" is epoxymenthyl.
Claim 12
Dependent Claim
14 words
A silica filler as defined in claim 1 wherein the alkoxyepoxyterpene silane is 3S-6,7-epoxycitronellytriethoxysilane.
Claim 13
Dependent Claim
14 words
A silica filler as defined in claim 1 wherein the alkoxyepoxyterpene silane is 3S-6,7-epoxycitronellylmethyldiethoxysilane.
Claim 14
Dependent Claim
14 words
A silica filler as defined in claim 1 wherein the alkoxyepoxyterpene silane is 3S-6,7-epoxycitronellyltrimethoxysilane.
Claim 15
Dependent Claim
14 words
A silica filler as defined in claim 1 wherein the alkoxyepoxyterpene silane is 3S-6,7-epoxycitronellylmethyldimethoxysilane.
Claim 16
Dependent Claim
14 words
A silica filler as defined in claim 1 wherein the alkoxyepoxyterpene silane is 6,7-geranyltriethoxysilane.
Claim 17
Dependent Claim
14 words
A silica filler as defined in claim 1 wherein the alkoxyepoxyterpene silane is 4R-1,2-epoxymenthyltriethoxysilane.
Claim 18
Dependent Claim
17 words
A silica filler as defined in claim 1 wherein the alkoxyepoxyterpene silane is a pre-hydrolyzed alkoxyepoxyterpene silane.
References Cited (Backward Citations)
US3455877A
Cited
US4297145A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-19 | 1991-10-19 | 1992-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-19 | 1995-10-19 | 1996-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-19 | 1999-10-19 | 2000-04-19 | $7700.00 | Window Closed / Lapsed |