Patent US4877822A successfully refreshed from Google Patents.
US4877822A
Expired / Lapsed
US
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Epoxy resin composition
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1988-04-08
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Granted: 1989-10-31
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Expires: 2008-04-08
Abstract
Abstract An epoxy resin composition which comprises a curable epoxy resin, a curing agent, an inorganic filler, and at least one copolymer selected from copolymers obtained by an addition reaction between aromatic polymers containing one or more epoxy groups and one or more alkenyl groups and the specific organopolysiloxanes; copolymers obtained by an addition reaction between aromatic polymers containing one or more epoxy groups and the specific amino group-containing organopolysiloxanes.
Inventors
- 👤 Kunio Itoh
- 👤 Toshio Shiobara
- 👤 Koji Futatsumori
- 👤 Kazutoshi Tomiyoshi
- 👤 Hisashi Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:42
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/02; C08G59/027; C08G77/00; C08G77/42; C08L; C08L63/00; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0313; H05K1/0353
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
115 words
An epoxy resin composition which comprises a curable epoxy resin, an epoxy resin agent, an inorganic filler, and a copolymer obtained by an addition reaction between aromatic polymers having one or more epoxy groups and one or more alkenyl groups and organopolysiloxanes of the following formula (1) ##EQU3## in which R represents a substituted or unsubstituted monovalent hydrocarbon group, "a" is a value of from 0.01 to 0.1, "b" is a value of from 1.8 to 2.2 and 1.81<a+b<2.3, and the number of silicon atoms in a molecule is an integer of from 20 to 400 and the number of hydrogen atoms directly connected to silicon atoms is an integer of from 1 to 5.
Claim 2
Dependent Claim
115 words
An epoxy resin composition which comprises a curable epoxy resin, an epoxy resin agent, an inorganic filler, and a copolymer obtained by an addition reaction between aromatic polymers having one or more epoxy groups and one or more alkenyl groups and organopolysiloxanes of the following formula (1) ##EQU3## in which R represents a substituted or unsubstituted monovalent hydrocarbon group, "a" is a value of from 0.01 to 0.1, "b" is a value of from 1.8 to 2.2 and 1.81<a+b<2.3, and the number of silicon atoms in a molecule is an integer of from 20 to 400 and the number of hydrogen atoms directly connected to silicon atoms is an integer of from 1 to 5.
Claim 3
Dependent Claim
30 words
The composition according to claim 1, wherein said curable epoxy resin is at least one resin selected from the group consisting of novolac epoxy resins and bisphenol a epoxy resins.
Claim 4
Dependent Claim
45 words
The composition according to claim 1, the aromatic polymer having one or more epoxy groups and one or more alkenyl groups is an epoxidized phenol novolac resin containing one or more alkenyl groups or an epoxidized cresol novolac resin containing one or more alkenyl groups.
Claim 5
Dependent Claim
33 words
The composition according to claim 1, wherein the organopolysiloxane of the formula (1) is at least one member selected from the group consisting of hydrogen-terminated dimethylpolysiloxane, hydrogen-terminated methylphenylpolysiloxane and hydrogen-terminated methyl (2-trimethoxysilylethyl) polysiloxane.
Claim 6
Dependent Claim
39 words
the composition according to claim 1, wherein the copolymer is present in the amount of from 1 to 100 parts by weight per 100 parts by weight of the total of said curable epoxy resin and said curing agent.
Claim 7
Dependent Claim
40 words
The composition according to claim 1, wherein said inorganic filler is present in the amount of from 100 to 1000 paarts by weight per 100 parts by weight of the total of said curable epoxy resin and said curing agent.
References Cited (Backward Citations)
GB906544A
Cited
GB788806A
Cited
US2819245A
Cited
US4376174A
Cited
JPS5821417A
Cited
JPS59129252A
Cited
US4657986A
Cited
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) | 1992-10-30 | 1993-05-01 | 1993-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-30 | 1997-05-01 | 1997-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-30 | 2001-05-01 | 2001-10-31 | $7700.00 | Window Closed / Lapsed |