US4024091A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spongeable silicone gum stock
Assignee: Dow Silicones Corp
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Filing: 1975-07-14
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Granted: 1977-05-17
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Expires: 1995-07-14
Abstract
Abstract Polydiorganosiloxane gum base stocks which contain per 100 parts by weight of the stock, 15 to 60 parts by weight of an organosiloxane having an average of at least 2 silicon-bonded hydroxyl radicals 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 1 to 200 p.p.m. platinum as a platinum catalyst, can be sponged by heating the composition above 125° C. The sponged products are elastomeric, have flame retardant properties and can be used where applications see relatively high temperatures.
Inventors
- 👤 Chi-Long Lee
- 👤 Gary M. Ronk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:46
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/02; C08J9/04; C08J9/06; C08K; C08K5/00; C08K5/04; C08K5/05; C08G; C08G77/00; C08G77/04; C08G77/12; C08G77/14; C08G77/16; C08J2383/00; C08J2383/04
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
189 words
A spongeable silicone composition comprising: a. 100parts by weight of a polydiorganosiloxane gum base stock wherein the gum has a Williams plasticity of greater than 0.030 inch, B. from 15 to 60 parts by weight of an organosiloxane having an average of at least 2 silicon-bonded hydroxyl radicals per molecule, where the organosiloxane (B) has from 0.5 to 3 parts by weight silicon-bonded hydroxyl radical in the amount of organosiloxane (B) present, C. from 3 to 25 parts by weight of an organohydrogensiloxane having an average of at least 2.5 siliconbonded hydrogen atoms per molecule, where the organohydrogenisiloxane (C) 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 1 to 200 parts by weight platinum per one million parts by weight silicone composition wherein the platinum is in the form of a platinum catalyst, in said spongeable silicone composition (B) and (C) are present in amounts such that the molar ratio of silicon-bonded hydrogen atoms to silicon-bonded hydroxyl radicals is from 1 to 5.
Claim 2
Dependent Claim
189 words
A spongeable silicone composition comprising: a. 100parts by weight of a polydiorganosiloxane gum base stock wherein the gum has a Williams plasticity of greater than 0.030 inch, B. from 15 to 60 parts by weight of an organosiloxane having an average of at least 2 silicon-bonded hydroxyl radicals per molecule, where the organosiloxane (B) has from 0.5 to 3 parts by weight silicon-bonded hydroxyl radical in the amount of organosiloxane (B) present, C. from 3 to 25 parts by weight of an organohydrogensiloxane having an average of at least 2.5 siliconbonded hydrogen atoms per molecule, where the organohydrogenisiloxane (C) 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 1 to 200 parts by weight platinum per one million parts by weight silicone composition wherein the platinum is in the form of a platinum catalyst, in said spongeable silicone composition (B) and (C) are present in amounts such that the molar ratio of silicon-bonded hydrogen atoms to silicon-bonded hydroxyl radicals is from 1 to 5.
Claim 3
Dependent Claim
31 words
The spongeable silicone composition according to claim 1 in which the organosiloxane of (B) is a hydroxyl endblocked polydimethylsiloxane having a viscosity of from 20 to 200 cps. at 25° C.
Claim 4
Dependent Claim
31 words
The spongeable silicone composition according to claim 1 in which the organohydrogenisiloxane of (C) is a trimethylsiloxy endblocked polymethylhydrogensiloxane having a viscosity of from 10 to 200 cps. at 25° C.
Claim 5
Dependent Claim
31 words
The spongeable silicone composition according to claim 2 in which the organohydrogensiloxane of (C) is a trimethylsiloxy endblocked polymethylhydrogensiloxane having a viscosity of from 10 to 200 cps. at 25° C.
Claim 6
Dependent Claim
17 words
The spongeable silicone composition according to claim 1 in which the inhibitor of (D) is 3-methyl-1pentyn 3-ol.
Claim 7
Dependent Claim
16 words
The spongeable silicone composition according to claim 2 in which the inhibitor of (D) is 3-methyl-1-pentyn-3-ol.
Claim 8
Dependent Claim
17 words
The spongeable silicone composition according to claim 3 in which the inhibitor of (D) is 3-methyl-1pentyn 3-ol.
Claim 9
Dependent Claim
17 words
The spongeable silicone composition according to claim 4 in which the inhibitor of (D) is 3-methyl-1pentyn 3-ol.
Claim 10
Dependent Claim
16 words
The spongeable silicone composition according to claim 5 in which the inhibitor of (D) is 3-methyl-1-pentyn-3-ol.
Claim 11
Dependent Claim
16 words
The spongeable silicone composition according to claim 1 in which the inhibitor of (D) is 3-methyl-1-butyn-3-ol.
Claim 12
Dependent Claim
16 words
The spongeable silicone composition according to claim 1 in which the inhibitor of (D) is 1-ethynylcyclohexan-1-ol.
Claim 13
Independent Claim
201 words
A method of making a spongeable silicone composition comprising mixing A. 100 parts by weight of a polydiorganosiloxane gum base stock wherein the gum has a Williams plasticity of greater than 0.030 inch and a mixture comprising B. from 15 to 60 parts by weight of an organosiloxane having an average of at least 2 silicon-bonded hydroxyl radicals per molecule, where the organosiloxane (B) has from 0.5 to 3 part by weight silicon-bonded hydroxyl radicals in the amount of organosiloxane (B) present, C. from 3 to 25 parts by weight of an organohydrogensiloxane having an average of at least 2.5 siliconbonded hydrogen atoms per molecule, where the organohydrogensiloxane (C) 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 1 to 200 parts by weight platinum per one million parts by weight of the silicone composition wherein the platinum is in the form of a platinum catalyst, in said spongeable silicone composition (B) and (C) are present in amounts such that the molar ratio of silicon-bonded hydrogen atoms to silicon-bonded hydroxyl radicals is from 1 to 5.
Claim 14
Independent Claim
201 words
A method of making a spongeable silicone composition comprising mixing A. 100 parts by weight of a polydiorganosiloxane gum base stock wherein the gum has a Williams plasticity of greater than 0.030 inch and a mixture comprising B. from 15 to 60 parts by weight of an organosiloxane having an average of at least 2 silicon-bonded hydroxyl radicals per molecule, where the organosiloxane (B) has from 0.5 to 3 part by weight silicon-bonded hydroxyl radicals in the amount of organosiloxane (B) present, C. from 3 to 25 parts by weight of an organohydrogensiloxane having an average of at least 2.5 siliconbonded hydrogen atoms per molecule, where the organohydrogensiloxane (C) 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 1 to 200 parts by weight platinum per one million parts by weight of the silicone composition wherein the platinum is in the form of a platinum catalyst, in said spongeable silicone composition (B) and (C) are present in amounts such that the molar ratio of silicon-bonded hydrogen atoms to silicon-bonded hydroxyl radicals is from 1 to 5.
Claim 15
Dependent Claim
72 words
The method in accordance with claim 12 in which the organosiloxane having silicon-bonded hydroxyl radicals is a hydroxyl endblocked polydimethylsiloxane having a viscosity of from 20 to 200 cps. at 25° C., the organohydrogensiloxane having silicon-bonded hydrogen atoms is a trimethylsiloxy endblocked polymethylhydrogensiloxane having a viscosity of from 10 to 200 cps. at 25° C. and the acetylenic alcohol inhibitor is selected from the group consisting of 3-methyl-1pentyn 3-ol, 3-methyl-1-butyn-3-ol and 1-ethynylcyclohexan-1-ol.
Claim 16
Dependent Claim
23 words
The method in accordance with claim 12 in which the organosiloxane having silicon-bonded hydroxyl radicals is included in the polydiorganosiloxane gum base stock.
Claim 17
Dependent Claim
17 words
A method of sponging a silicone composition comprising heating the composition of claim 1 above 125° C.
Claim 18
Dependent Claim
10 words
A silicone sponge prepared by the method of claim 15.
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) | 1980-05-16 | 1980-11-15 | 1981-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-16 | 1984-11-15 | 1985-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-16 | 1988-11-15 | 1989-05-17 | $7700.00 | Window Closed / Lapsed |