Patent US4663397A successfully refreshed from Google Patents.
US4663397A
Expired / Lapsed
US
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Thermosetting resin composition
Assignee: DuPont Toray Specialty Materials KK
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Filing: 1986-03-24
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Granted: 1987-05-05
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Expires: 2006-03-24
Abstract
Abstract Thermosetting resin compositions of the present invention comprises a thermosetting resin and a specified class of cured polyorganosiloxane resins dispersed as extremely fine particles in the thermosetting resin. Moldings and other shaped articles prepared using these compositions are flexible and exhibit small coefficients of thermal expansion and low shrinkage during molding.
Inventors
- 👤 Yoshitsugu Morita
- 👤 Akihiko Shirahata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:03
CPC Classifications
C; C08; C08L; C08L87/00; C08L101/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
150 words
A thermosetting resin composition comprising (a) 100 parts by weight of a curable organic thermosetting resin, and (b) from 1 to 100 parts by weight of a finely divided, cured polyorganosiloxane resin wherein at least 90 weight percent of said polyorganosiloxane resin consists essentially of R 1 R 2 R 3 SiO 0 .5 units and R 4 SiO 1 .5 units and any remainder consists essentially of at least one member selected from the group consisting of R 5 R 6 SiO units and SiO 4/2 units, where each of R 1 , R 2 , R 3 , R 4 , R 5 , and R 6 repesents a hydrogen atom, a monovalent hydrocarbon radical, or a monovalent substituted hydrocarbon radical, and the molar ratio of R 1 R 2 R 3 SiO 0 .5 units to R 4 SiO 0 .5 units is from 0.1 to 3.
Claim 2
Dependent Claim
150 words
A thermosetting resin composition comprising (a) 100 parts by weight of a curable organic thermosetting resin, and (b) from 1 to 100 parts by weight of a finely divided, cured polyorganosiloxane resin wherein at least 90 weight percent of said polyorganosiloxane resin consists essentially of R 1 R 2 R 3 SiO 0 .5 units and R 4 SiO 1 .5 units and any remainder consists essentially of at least one member selected from the group consisting of R 5 R 6 SiO units and SiO 4/2 units, where each of R 1 , R 2 , R 3 , R 4 , R 5 , and R 6 repesents a hydrogen atom, a monovalent hydrocarbon radical, or a monovalent substituted hydrocarbon radical, and the molar ratio of R 1 R 2 R 3 SiO 0 .5 units to R 4 SiO 0 .5 units is from 0.1 to 3.
Claim 3
Dependent Claim
32 words
A composition according to claim 1 where the substituent present on said substituted hydrocarbon radical is selected from the group consisting of halogen, epoxy, glycidoxy, amino, hydroxyl, carboxyl, carboxylate ester and mercapto.
Claim 4
Dependent Claim
39 words
A composition according to claim 1 where R 1 through R 6 , inclusive are individually selected from alkyl, fluoroalkyl, cycloalkyl, alkenyl and aryl radicals, and the average particle size of said polyorganosiloxane resin is less than 1 mm.
Claim 5
Dependent Claim
52 words
A composition according to claim 2 where R 1 through R 6 , inclusive are individually selected from the group consisting of methyl, ethyl, vinyl, phenyl and 3-glycidoxypropyl, the average particle size of said polyorganosiloxane resin is less than 200 microns, and the composition includes a curing agent for said polyorganosiloxane resin.
Claim 6
Dependent Claim
72 words
A composition according to claim 4 where said polyorganosiloxane resin comprises (CH 3 ) 3 SiO 0 .5, (CH 3 ) 2 (CH 2 ═CHCH 2 )SiO 0 .5, and CH 3 SiO 1 .5 units, the average particle size of the polyorganosiloxane resin is less than 200 microns, the thermosetting resin is selected from the group consisting of phenol novolac resins and polyimide resins, and said curing agent is a polyorganohydrogensiloxane.
Claim 7
Dependent Claim
13 words
A composition according to claim 5 where said polyorganosiloxane resin includes dimethylphenylsiloxy units.
Claim 8
Dependent Claim
19 words
A composition according to claim 5 where said polyorganosiloxane resin contains up to 10 weight percent of a polydiorganosiloxane.
Claim 9
Dependent Claim
28 words
A composition according to claim 4 where said polyorganosiloxane resin consists essentially of trimethylsiloxy, methylsiloxy andd dimethyl-3-glycidoxypropylsiloxy units and said composition contains an imidazole as a curing accelerator.
Claim 10
Dependent Claim
14 words
A composition according to claim 7 where said polydiorganosiloxane is a dimethylvinylsiloxy terminated polydimethylsiloxane.
Claim 11
Dependent Claim
39 words
A composition according to claim 1 where up to 10 percent by weight of said polyorganosiloxane resin is a block copolymer wherein the repeating units are derived from an organic resin and the repeating units of said polyorganosiloxane resin.
References Cited (Backward Citations)
JPS4825739A
Cited
JPS5236534A
Cited
US4087478A
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JPS5314643A
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US4388449A
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US4604435A
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US4537829A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-05-04 | 1990-11-03 | 1991-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-04 | 1994-11-03 | 1995-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-04 | 1998-11-03 | 1999-05-05 | $7700.00 | Window Closed / Lapsed |