US4613659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low temperature polymethylsiloxane containing silicon-bonded hydrogen and curable compositions made therewith
Assignee: Dow Silicones Corp
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Filing: 1985-12-16
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Granted: 1986-09-23
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Expires: 2005-12-16
Abstract
Abstract Polymethylsiloxanes containing silicon-bonded hydrogen exhibit low temperature properties and can be made into gels with which also exhibit low temperature properties or into elastomeric materials. The polymethylsiloxanes have 84 to 96 mole percent dimethylsiloxane units, 0.5 to 6 mole percent trimethylsiloxy units, 2 to 10 mole percent methylsilsesquioxane units, and 0.25 to 3 mole percent monohydrogendimethylsiloxy units and the total mole percent of the trimethylsiloxy units and the monohydrogendimethylsiloxy units is at least 1.5.
Inventors
- 👤 Chi-Long Lee
- 👤 Myron T. Maxson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:28
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/12; C08G77/42
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
51 words
A polymethylsiloxane containing silicon-bonded hydrogen consisting of 84 to 96 mole percent dimethylsiloxane units, 2 to 10 mole percent methylsilsesquioxane units, 0.5 to 6 mole percent trimethylsiloxy units, and 0.25 to 3 mole percent monohydrogendimethylsiloxy units, where the total mole percent of trimethylsiloxy units and monohydrogendimethylsiloxy units is at least 1.5.
Claim 2
Dependent Claim
51 words
A polymethylsiloxane containing silicon-bonded hydrogen consisting of 84 to 96 mole percent dimethylsiloxane units, 2 to 10 mole percent methylsilsesquioxane units, 0.5 to 6 mole percent trimethylsiloxy units, and 0.25 to 3 mole percent monohydrogendimethylsiloxy units, where the total mole percent of trimethylsiloxy units and monohydrogendimethylsiloxy units is at least 1.5.
Claim 3
Dependent Claim
66 words
The polymethylsiloxane containing silicon-bonded hydrogen according to claim 1 in which the mole percentages of the units are 90 to 94 for the dimethylsiloxane units, 4.5 to 7 for the methylsilsesquioxane units, 2 to 3 for the trimethylsiloxy units, and 0.5 to 2 for the monohydrogendimethylsiloxy units, and where the total mole percent of the trimethylsiloxy units and the monohydrogendimethylsiloxy units is from 2.5 to 5.
Claim 4
Dependent Claim
12 words
A composition comprising the polymethylsiloxane of claim 1 and a crosslinking agent.
Claim 5
Dependent Claim
20 words
The composition according to claim 3 in which the crosslinking agent is a vinyl containing polyorganosiloxane and a hydrosilation catalyst.
Claim 6
Dependent Claim
17 words
The composition according to claim 4 in which the vinyl containing polyorganosiloxane is a vinyldimethylsiloxy endblocked polydimethylsiloxane.
Claim 7
Dependent Claim
15 words
The composition according to claim 5 in which the hydrosilation catalyst is a platinum catalyst.
Claim 8
Dependent Claim
15 words
The composition according to claim 4 in which the hydrosilation catalyst is a platinum catalyst.
Claim 9
Dependent Claim
12 words
The composition according to claim 6 further comprising a platinum catalyst inhibitor.
Claim 10
Dependent Claim
12 words
The composition according to claim 7 further comprising a platinum catalyst inhibitor.
Claim 11
Dependent Claim
45 words
The composition according to claim 4 in which the vinyl containing polyorganosiloxane consists essentially of 80 to 96.5 mole percent dimethylsiloxane units, 2 to 10 mole percent methylsilsesquioxane units, and 1.25 to 6 mole percent trimethylsiloxy units, and 0.25 to 4 mole percent monovinyldimethylsiloxy units.
Claim 12
Dependent Claim
40 words
The composition according to claim 6 in which the polymethylsiloxane containing silicon-bonded hydrogen and the vinyldimethylsiloxy endblocked polydimethylsiloxane are present in amounts to provide a ratio of moles of SiH to moles of silicon-bonded vinyl of from 0.25/1.0 to 5/1.0.
Claim 13
Dependent Claim
40 words
The composition according to claim 11 in which the vinyldimethylsiloxy endblocked polydimethylsiloxane has an average of from 3 to 20 dimethylsiloxane units per molecule and the ratio of the moles of SiH to silicon-bonded vinyl is from 0.5/1.0 to 2/1.0.
Claim 14
Dependent Claim
23 words
A gel obtained by curing the composition of claim 12 where the gel has a penetration of from 1 mm to 7 mm.
Claim 15
Dependent Claim
23 words
The composition according to claim 10 in which the ratio of the moles of SiH to silicon-bonded vinyl is from 0.25/1.0 to 1.0/1.0.
Claim 16
Dependent Claim
23 words
A gel obtained by curing the composition of claim 14 where the gel has a penetration of from 1 mm to 7 mm.
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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) | 1989-09-22 | 1990-03-24 | 1990-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-22 | 1994-03-24 | 1994-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-22 | 1998-03-24 | 1998-09-23 | $7700.00 | Window Closed / Lapsed |