Patent US3948848A successfully refreshed from Google Patents.
US3948848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low temperature solventless silicone resins
Assignee: Dow Silicones Corp
•
Filing: 1975-08-04
•
Granted: 1976-04-06
•
Expires: 1995-08-04
Abstract
Abstract Organosilicon resins having excellent thermal shock resistance in either the filled or unfilled state are obtained by curing mixtures of (A) a copolymer of (in mole percent) 35 to 42 monophenylsiloxane, 0 to 12 diphenylsiloxane, 35 to 50 dimethylsiloxane and 8 to 15 vinylmethylsiloxane with (B) a copolymer of (in mole percent) 8 to 15 diphenylsiloxane, 30 to 55 methylhydrogensiloxane, 28 to 45 dimethylsiloxane and 5 to 12 trimethylsiloxane in amount such that there is a stoichiometric amount of SiH and Si vinyl ± 10 percent of either ingredient. The preferred fillers are mixtures of 1/32 to 1/8 inch glass fibers and 2 to 8 microns crystalline silica.
Inventors
- 👤 Alan E. Mink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:32
CPC Classifications
C; C08; C08L; C08L83/00; C08L83/04; C08K; C08K3/00; C08K3/34; C08K3/36; C08K5/00; C08K5/0008; C08K5/0025; C08K7/00; C08K7/02; C08K7/04; C08K7/14
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
78 words
A curable composition consisting essentially of a mixture of A. a copolymer of (in mole percent) 35 to 42 monophenylsiloxane, 0 to 12 diphenylsiloxane, 35 to 50 dimethylsiloxane and 8 to 15 vinylmethylsiloxane, and B. a copolymer of (in mole percent) 8 to 15 diphenylsiloxane, 30 to 55 methylhydrogensiloxane, 28 to 45 dimethylsiloxane and 5 to 12 trimethylsiloxane in amount such that there is a stoichiometric amount of SiH and Si vinyl ± 10 percent of either ingredient.
Claim 2
Dependent Claim
78 words
A curable composition consisting essentially of a mixture of A. a copolymer of (in mole percent) 35 to 42 monophenylsiloxane, 0 to 12 diphenylsiloxane, 35 to 50 dimethylsiloxane and 8 to 15 vinylmethylsiloxane, and B. a copolymer of (in mole percent) 8 to 15 diphenylsiloxane, 30 to 55 methylhydrogensiloxane, 28 to 45 dimethylsiloxane and 5 to 12 trimethylsiloxane in amount such that there is a stoichiometric amount of SiH and Si vinyl ± 10 percent of either ingredient.
Claim 3
Dependent Claim
17 words
The cured composition of claim 1 in which a platinum catalyst is used as the curing agent.
Claim 4
Dependent Claim
53 words
A curable composition consisting essentially of, in percent by weight, 35 to 65 of (A) plus (B) of claim 1, 5 to 25 of glass fibers having an average length of from 1/32 to 1/8 inch and 10 to 50 of crystalline silica having an average particle size of 2 to 8 microns.
Claim 5
Dependent Claim
13 words
The composition of claim 3 which has been cured with a platinum catalyst.
Claim 6
Dependent Claim
48 words
A curable composition consisting essentially of, in percent by weight, 45 to 55 of (A) plus (B) of claim 1, 10 to 15 of 1/32 to 1/8 inch glass fibers and 30 to 45 of a crystalline silica having an average particle size of 2 to 8 microns.
Claim 7
Dependent Claim
27 words
The composition of claim 3 in which the glass fibers are 1/16 inch and the silica filler has an average particle size of 2 to 5 microns.
Claim 8
Dependent Claim
30 words
The composition of claim 5 in which the glass fibers have an average length of 1/16 inch and the silica has an average particle size of 2 to 5 microns.
Claim 9
Dependent Claim
6 words
The cured composition of claim 5.
Claim 10
Dependent Claim
6 words
The cured composition of claim 6.
Claim 11
Dependent Claim
6 words
The cured composition of claim 7.
References Cited (Backward Citations)
US3844992A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-06 | 1979-10-06 | 1980-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-06 | 1983-10-06 | 1984-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-06 | 1987-10-06 | 1988-04-06 | $7700.00 | Window Closed / Lapsed |