Patent US5574073A successfully refreshed from Google Patents.
US5574073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Curable silicone compositions which are foams or elastomers
Assignee: Dow Silicones Corp
•
Filing: 1996-01-17
•
Granted: 1996-11-12
•
Expires: 2016-01-17
Abstract
Abstract What is disclosed herein relates to curable silicone compositions which provide high strength foams or elastomers. These foams or elastomers have high strength properties which are provided by a combination of non-resinous organopolysiloxanes as the base polymer. The high strength properties are better than the high strength properties of cured silicone compositions where only one non-resinous organopolysiloxane polymer type is employed. These compositions have the added benefit of being less expensive than resin based formulations.
Inventors
- 👤 Donnie R. Juen
- 👤 William R. Nicholson
- 👤 Lawrence J. Rapson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:12
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/02; C08L; C08L83/00; C08L83/04; C08G; C08G77/00; C08G77/04; C08G77/12; C08G77/20; C08J2383/00; C08J2383/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
183 words
A curable silicone composition comprising A. a non-resinous-siloxane base polymer system in which the polymers contain at least two vinyl groups per molecule which is a combination of: (i) high molecular weight siloxane polymers containing vinyl groups only on the terminal ends thereof and, (ii) second siloxane polymers containing vinyl groups selected from the group consisting essentially of: a. low molecular weight siloxane polymers having vinyl groups which are located only pendant thereon; b. low molecular weight siloxane polymers having vinyl groups which are located both pendant and on the terminal ends thereof; c. high molecular weight siloxane polymers having vinyl groups which are located only pendant thereon; d. high molecular weight siloxane polymers having vinyl groups which are located both pendant and on the terminal ends thereof, and e. low molecular weight siloxane polymers containing vinyl groups only on the terminal ends thereof; B. a silicon-containing crosslinker for the silicone base polymer system, said crosslinker containing at least two --SiH groups per molecule; C. a platinum group catalyst sufficient for curing the silicone composition and, D. a blowing agent for the composition.
Claim 2
Dependent Claim
183 words
A curable silicone composition comprising A. a non-resinous-siloxane base polymer system in which the polymers contain at least two vinyl groups per molecule which is a combination of: (i) high molecular weight siloxane polymers containing vinyl groups only on the terminal ends thereof and, (ii) second siloxane polymers containing vinyl groups selected from the group consisting essentially of: a. low molecular weight siloxane polymers having vinyl groups which are located only pendant thereon; b. low molecular weight siloxane polymers having vinyl groups which are located both pendant and on the terminal ends thereof; c. high molecular weight siloxane polymers having vinyl groups which are located only pendant thereon; d. high molecular weight siloxane polymers having vinyl groups which are located both pendant and on the terminal ends thereof, and e. low molecular weight siloxane polymers containing vinyl groups only on the terminal ends thereof; B. a silicon-containing crosslinker for the silicone base polymer system, said crosslinker containing at least two --SiH groups per molecule; C. a platinum group catalyst sufficient for curing the silicone composition and, D. a blowing agent for the composition.
Claim 3
Dependent Claim
177 words
A curable silicone composition comprising A. a non-resinous siloxane base polymer system in which the polymers contain at least two vinyl groups per molecule which is a combination of: (i) high molecular weight siloxane polymers containing vinyl groups only on the terminal ends thereof and, (ii) second siloxane polymers containing vinyl groups selected from the group consisting essentially of: a. low molecular weight siloxane polymers having vinyl groups which are located only pendant thereon; b. low molecular weight siloxane polymers having vinyl groups which are located both pendant and on the terminal ends thereof; c. high molecular weight siloxane polymers having vinyl groups which are located only pendant thereon; d. high molecular weight siloxane polymers having vinyl groups which are located both pendant and on the terminal ends thereof, and e. low molecular weight siloxane polymers containing vinyl groups only on the terminal ends thereof; B. a silicon-containing crosslinker for the silicone base polymer system, said crosslinker containing at least two --SiH groups per molecule and, C. a platinum group catalyst sufficient for curing the silicone composition.
Claim 4
Dependent Claim
177 words
A curable silicone composition comprising A. a non-resinous siloxane base polymer system in which the polymers contain at least two vinyl groups per molecule which is a combination of: (i) high molecular weight siloxane polymers containing vinyl groups only on the terminal ends thereof and, (ii) second siloxane polymers containing vinyl groups selected from the group consisting essentially of: a. low molecular weight siloxane polymers having vinyl groups which are located only pendant thereon; b. low molecular weight siloxane polymers having vinyl groups which are located both pendant and on the terminal ends thereof; c. high molecular weight siloxane polymers having vinyl groups which are located only pendant thereon; d. high molecular weight siloxane polymers having vinyl groups which are located both pendant and on the terminal ends thereof, and e. low molecular weight siloxane polymers containing vinyl groups only on the terminal ends thereof; B. a silicon-containing crosslinker for the silicone base polymer system, said crosslinker containing at least two --SiH groups per molecule and, C. a platinum group catalyst sufficient for curing the silicone composition.
Claim 5
Dependent Claim
17 words
A composition as claimed in claim 1 wherein there is additionally present at least one catalyst inhibitor.
Claim 6
Dependent Claim
16 words
A composition as claimed in claim 1 wherein there is additionally present at least one filler.
Claim 7
Dependent Claim
18 words
A composition as claimed in claim 1 wherein there is additionally present at least one foam stabilizing additive.
Claim 8
Dependent Claim
17 words
A composition as claimed in claim 2 wherein there is additionally present at least one catalyst inhibitor.
Claim 9
Dependent Claim
16 words
A composition as claimed in claim 2 wherein there is additionally present at least one filler.
References Cited (Backward Citations)
US3419593A
Cited
US3923705A
Cited
US4487906A
Cited
US4590222A
Cited
US5279894A
Cited
US5011865A
Cited
US5162397A
Cited
US5414023A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-11-12 | 2000-05-13 | 2000-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-11-12 | 2004-05-13 | 2004-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-11-12 | 2008-05-13 | 2008-11-12 | $7700.00 | Window Closed / Lapsed |