US4026843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foamable silicone gum stock having less skin thickness
Assignee: Dow Silicones Corp
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Filing: 1975-07-14
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Granted: 1977-05-31
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Expires: 1995-07-14
Abstract
Abstract Polydiorganosiloxane gum base stocks which contain per 100 parts by weight of the stock, 5 to 30 parts by weight of an organic alcohol having one C--OH per molecule, 3 to 25 parts by weight of an organosiloxane having an average of at least 2.5 silicon-bonded hydrogen atoms per molecule, 0.05 to 0.5 parts by weight acetylenic alcohol inhibitor and 5 to 20 p.p.m. platinum as a platinum catalyst, can be foamed by heating the composition above 125° C. The sponged products are thin skinned or no skin, elastomeric, have flame retardant properties and can be used where applicatons see relativey high temperatures.
Inventors
- 👤 Ronald E. Kittle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:30
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06; C08J2383/00; C08J2383/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
147 words
A silicone foam composition comprising A. 100 parts by weight of a polydiorganosiloxane gum base stock wherein the gum has a Williams plasticity of greater than 0.030 inch, B. from 5 to 30 parts by weight of an organic alcohol having one C--OH per molecule selected from the group consisting of methanol, ethanol, propanol, isopropanol, butanol, hexanol, cyclohexanol, pentanol and octanol, C. from 3 to 25 parts by weight of an organohydrogensiloxane having an average of at least 2.5 silicon-bonded hydrogen atoms per molecule, where the organohydrogensiloxane has from 0.01 to 0.5 parts by weight silicon-bonded hydrogen atoms in the amount of organohydrogensiloxane (C) present, D. from 0.05 to 0.5 parts by weight of an acetylenic alcohol inhibitor, and E. from 5 to 20 parts by weight platinum per one million parts by weight silicone composition wherein the platinum is in the form of a platinum catalyst.
Claim 2
Dependent Claim
147 words
A silicone foam composition comprising A. 100 parts by weight of a polydiorganosiloxane gum base stock wherein the gum has a Williams plasticity of greater than 0.030 inch, B. from 5 to 30 parts by weight of an organic alcohol having one C--OH per molecule selected from the group consisting of methanol, ethanol, propanol, isopropanol, butanol, hexanol, cyclohexanol, pentanol and octanol, C. from 3 to 25 parts by weight of an organohydrogensiloxane having an average of at least 2.5 silicon-bonded hydrogen atoms per molecule, where the organohydrogensiloxane has from 0.01 to 0.5 parts by weight silicon-bonded hydrogen atoms in the amount of organohydrogensiloxane (C) present, D. from 0.05 to 0.5 parts by weight of an acetylenic alcohol inhibitor, and E. from 5 to 20 parts by weight platinum per one million parts by weight silicone composition wherein the platinum is in the form of a platinum catalyst.
Claim 3
Dependent Claim
36 words
The silicone foam composition according to claim 1 in which there is also present from 1 to 20 parts by weight of a reinforcing silica filler additional to any present in the polydiorganosiloxane gum base stock.
Claim 4
Dependent Claim
16 words
The silicone foam composition according to claim 2 in which the acetylenic alcohol inhibitor is 1-ethynylcyclohexan-1-ol.
Claim 5
Dependent Claim
17 words
The silicone foam composition according to claim 3 in which the organic alcohol of (B) is methanol.
Claim 6
Dependent Claim
17 words
The silicone foam composition according to claim 3 in which the organic alcohol of (B) is isopropanol.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |