US4686271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic silicone crumb
Assignee: Dow Silicones Corp
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Filing: 1986-03-03
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Granted: 1987-08-11
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Expires: 2006-03-03
Abstract
Abstract A silicone crumb in a fine particulate form has an extrusion rate of at least 50 grams per minute through an orifice of 0.5 inch diameter under a pressure of 345 kilopascals and compression points of less than 1035 kilopascals. This crumb is made from a vinyl-containing polyorganosiloxane, a silicon-bonded hydrogen containing polysiloxane, and a platinum catalyst. The crumb is useful in hydraulic applications.
Inventors
- 👤 Earl W. Beck
- 👤 Sam A. Brady
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:11
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; B; B29; B29C; B29C43/00; B29C43/02; B29C43/10; C08L; C08L83/00; C08L83/04; C08G; C08G77/00; C08G77/04; C08G77/12; C08G77/20; C08G77/22; C08G77/24; C08J2383/00; C08J2383/04
Claims Analysis
Total Claims: 41
Claim 1
Independent Claim
172 words
A silicone crumb comprising the cured product obtained by curing a mixture of (A) a vinyl-containing polyorganosiloxane consisting essentially of units selected from the group consisting of diorganosiloxane units, monoorganosilsesquioxane units, and triorganosiloxy units in which the organic radicals are monovalent hydrocarbon radicals or monovalent halogenated hydrocarbon radicals, in the polyorganosiloxane the organic radicals being such that at least 0.1 weight percent of them are vinyl radicals, (B) a silicon-bonded hydrogen containing polysiloxane in which there is at least 0.5 weight percent silicon-bonded hydrogen atoms, the valences of the silicon atoms not being satisfied by divalent oxygen atoms or silicon-bonded hydrogen atoms are satisfied by monovalent hydrocarbon radicals or monovalent halogenated hydrocarbon radicals, (C) a platinum catalyst for the hydrosilation reaction of (A) and (B), the cured product being in a fine particulate form which exhibits an extrusion rate of at least 50 grams per minute through an orifice of 0.5 inch diameter under a pressure of 345 kilopascals and compression points of less than 1035 kilopascals for the first two compressions.
Claim 2
Dependent Claim
172 words
A silicone crumb comprising the cured product obtained by curing a mixture of (A) a vinyl-containing polyorganosiloxane consisting essentially of units selected from the group consisting of diorganosiloxane units, monoorganosilsesquioxane units, and triorganosiloxy units in which the organic radicals are monovalent hydrocarbon radicals or monovalent halogenated hydrocarbon radicals, in the polyorganosiloxane the organic radicals being such that at least 0.1 weight percent of them are vinyl radicals, (B) a silicon-bonded hydrogen containing polysiloxane in which there is at least 0.5 weight percent silicon-bonded hydrogen atoms, the valences of the silicon atoms not being satisfied by divalent oxygen atoms or silicon-bonded hydrogen atoms are satisfied by monovalent hydrocarbon radicals or monovalent halogenated hydrocarbon radicals, (C) a platinum catalyst for the hydrosilation reaction of (A) and (B), the cured product being in a fine particulate form which exhibits an extrusion rate of at least 50 grams per minute through an orifice of 0.5 inch diameter under a pressure of 345 kilopascals and compression points of less than 1035 kilopascals for the first two compressions.
Claim 3
Dependent Claim
29 words
The silicone crumb in accordance with claim 1 in which the vinyl-containing polyorganosiloxane of (A) is made up of a combination of diorganosiloxane units, monoorganosilsesquioxane units, and triorganosiloxy units.
Claim 4
Dependent Claim
17 words
The silicone crumb in accordance with claim 2 in which the organic radicals are methyl and vinyl.
Claim 5
Dependent Claim
32 words
The silicone crumb in accordance with claim 3 in which the diorganosiloxane units are dimethylsiloxane units, the monoorganosilsesquioxane units are methylsilsesquioxane units, and the triorganosiloxy units are trimethylsiloxy units and dimethylvinylsiloxy units.
Claim 6
Dependent Claim
24 words
The silicone crumb in accordance with claim 4 in which the vinyl-containing polyorganosiloxane has a viscosity at 25° C. of less than 5 pascal-seconds.
Claim 7
Dependent Claim
20 words
The silicone crumb in accordance with claim 1 in which the silicon-bonded hydrogen containing polysiloxane is a trimethylsiloxy endblocked polymethylhydrogensiloxane.
Claim 8
Dependent Claim
19 words
The silicone crumb in accordance with claim 2 in which the silicon-bonded hydrogen-containing polysiloxane is a trimethylsiloxy endblocked polymethylhydrogensiloxane.
Claim 9
Dependent Claim
20 words
The silicone crumb in accordance with claim 3 in which the silicon-bonded hydrogen containing polysiloxane is a trimethylsiloxy endblocked polymethylhydrogensiloxane.
Claim 10
Dependent Claim
19 words
The silicone crumb in accordance with claim 4 in which the silicon-bonded hydrogen-containing polysiloxane is a trimethylsiloxy endblocked polymethylhydrogensiloxane.
Claim 11
Dependent Claim
19 words
The silicone crumb in accordance with claim 5 in which the silicon-bonded hydrogen-containing polysiloxane is a trimethylsiloxy endblocked polymethylhydrogensiloxane.
Claim 12
Dependent Claim
22 words
The silicone crumb in accordance with claim 1 further comprising a platinum catalyst inhibitor for inhibiting the hydrosilation reaction at room temperature.
Claim 13
Dependent Claim
22 words
The silicone crumb in accordance with claim 2 further comprising a platinum catalyst inhibitor for inhibiting the hydrosilation reaction at room temperature.
Claim 14
Dependent Claim
22 words
The silicone crumb in accordance with claim 5 further comprising a platinum catalyst inhibitor for inhibiting the hydrosilation reaction at room temperature.
Claim 15
Dependent Claim
22 words
The silicone crumb in accordance with claim 6 further comprising a platinum catalyst inhibitor for inhibiting the hydrosilation reaction at room temperature.
Claim 16
Dependent Claim
22 words
The silicone crumb in accordance with claim 10 further comprising a platinum catalyst inhibitor for inhibiting the hydrosilation reaction at room temperature.
Claim 17
Dependent Claim
24 words
The silicone crumb in accordance with claim 1 in which the platinum catalyst (C) is a complex made from chloroplatinic acid and a divinylsiloxane.
Claim 18
Dependent Claim
24 words
The silicone crumb in accordance with claim 2 in which the platinum catalyst (C) is a complex made from chloroplatinic acid and a divinylsiloxane.
Claim 19
Dependent Claim
24 words
The silicone crumb in accordance with claim 5 in which the platinum catalyst (C) is a complex made from chloroplatinic acid and a divinylsiloxane.
Claim 20
Dependent Claim
24 words
The silicone crumb in accordance with claim 6 in which the platinum catalyst (C) is a complex made from chloroplatinic acid and a divinylsiloxane.
Claim 21
Dependent Claim
24 words
The silicone crumb in accordance with claim 10 in which the platinum catalyst (C) is a complex made from chloroplatinic acid and a divinylsiloxane.
Claim 22
Dependent Claim
24 words
The silicone crumb in accordance with claim 15 in which the platinum catalyst (C) is a complex made from chloroplatinic acid and a divinylsiloxane.
Claim 23
Dependent Claim
12 words
The silicone crumb in accordance with claim 1 further comprising a filler.
Claim 24
Dependent Claim
12 words
The silicone crumb in accordance with claim 2 further comprising a filler.
Claim 25
Dependent Claim
12 words
The silicone crumb in accordance with claim 5 further comprising a filler.
Claim 26
Dependent Claim
12 words
The silicone crumb in accordance with claim 10 further comprising a filler.
Claim 27
Dependent Claim
12 words
The silicone crumb in accordance with claim 15 further comprising a filler.
Claim 28
Dependent Claim
12 words
The silicone crumb in accordance with claim 16 further comprising a filler.
Claim 29
Dependent Claim
12 words
The silicone crumb in accordance with claim 21 further comprising a filler.
Claim 30
Dependent Claim
31 words
The silicone crumb in accordance with claim 1 in which the vinyl-containing polyorganosiloxane of (A) is a triorganosiloxy endblocked polymethylvinylsiloxane having a viscosity at 25° C. of less than 50 pascal-seconds.
Claim 31
Dependent Claim
19 words
The silicone crumb in accordance with claim 29 in which the triorganosiloxy of the polymethylvinylsiloxane of (A) is trimethylsiloxy.
Claim 32
Dependent Claim
20 words
The silicone crumb in accordance with claim 30 in which the silicon-bonded hydrogen containing polysiloxane is a trimethylsiloxy endblocked polymethylhydrogensiloxane.
Claim 33
Dependent Claim
22 words
The silicone crumb in accordance with claim 31 further comprising a platinum catalyst inhibitor for inhibiting the hydrosilation reaction at room temperature.
Claim 34
Dependent Claim
24 words
The silicone crumb in accordance with claim 32 in which the platinum catalyst (C) is a complex made from chloroplatinic acid and a divinylsiloxane.
Claim 35
Dependent Claim
12 words
The silicone crumb in accordance with claim 33 further comprising a filler.
Claim 36
Dependent Claim
20 words
The silicone crumb in accordance with claim 1 in which the extrusion rate is at least 800 grams per minute.
Claim 37
Dependent Claim
20 words
The silicone crumb in accordance with claim 4 in which the extrusion rate is at least 800 grams per minute.
Claim 38
Dependent Claim
20 words
The silicone crumb in accordance with claim 5 in which the extrusion rate is at least 800 grams per minute.
Claim 39
Dependent Claim
20 words
The silicone crumb in accordance with claim 10 in which the extrusion rate is at least 800 grams per minute.
Claim 40
Dependent Claim
20 words
The silicone crumb in accordance with claim 15 in which the extrusion rate is at least 800 grams per minute.
Claim 41
Dependent Claim
20 words
The silicone crumb in accordance with claim 20 in which the extrusion rate is at least 800 grams per minute.
References Cited (Backward Citations)
US3843601A
Cited
US4528156A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-10 | 1991-02-09 | 1991-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-10 | 1995-02-09 | 1995-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-10 | 1999-02-09 | 1999-08-11 | $7700.00 | Window Closed / Lapsed |