US3821140A
Expired / Lapsed
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Organopolysiloxane compositions
Assignee: Rhone Poulenc SA
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Filing: 1973-01-05
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Granted: 1974-06-28
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Expires: 1993-01-05
Abstract
Abstract A polysiloxane composition curable to a fire resistant elastomer comprises (a) an organopolysiloxane rubber with blocked ends, at least 50 percent of the organic radicals being methyl, (b) an inorganic filler, organic peroxide, and per 100 parts rubber 0.001-0.01 parts of an additive comprising platinum, 3-35 parts of rare earth metal oxide, or 1 - 8 parts of rare earth metal hydroxide, the latter optionally with up to 5 parts of magnesium oxide.
Inventors
- 👤 G Milbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:00
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08K13/00; C08K13/02
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
18 words
A composition according to claim 1 wherein the polymer chain in rubber (a) is terminated with trimethylsiloxy radicals.
Claim 2
Dependent Claim
28 words
A composition according to claim 1 wherein the filler has been treated with an organosilicon compound selected from the group consisting of octamethyl cyclotetrasiloxane hexamethyldisilazane, trimethylchlorosilane and dimethylvinylchlorosilane.
Claim 3
Dependent Claim
31 words
A composition according to claim 1 comprising up to 20 parts of an organosilicon plasticizer selected from the group consisting of silanes with hydrolysable groups or hydrolysed or alkoxylated diorganopolysiloxane oils.
Claim 4
Dependent Claim
29 words
A composition according to claim 1 wherein the platinum compound is chloroplatinic acid, a platinum chloride/olefin complex or the reaction product of chloroplatinic acid and an alcohol or aldehyde.
Claim 5
Dependent Claim
22 words
A composition according to claim 1 wherein the rare earth metal is at least one of cerium, lanthanum, neodymium, praseodymium and samarium.
Claim 6
Dependent Claim
29 words
A composition according to claim 6 comprising 1 to 8 parts in total of at least one rare earth metal hydroxide and up to 5 parts of magnesium oxide.
Claim 7
Dependent Claim
198 words
A composition according to claim 1 comprising (a) 100 parts of a diorganopolysiloxane rubber having a least 94 percent of the organic radical bonded to silicon being methyl, the remainder being vinyl and/or phenyl, and terminated with trimethylsilyloxy radicals (b) 5-100 parts of silica, quartz or silica treated with an organosilicon compound selected from the group consisting of octamethyl cyclotetrasiloxane hexamethyldisilazane, trimethylchlorosilane and dimethylvinylchlorosilane (c) up to 20 parts of organosilicon plasticizer selected from the group consisting of silanes with hydrolysable groups or hydrolysed or alkoxylated diorganopolysiloxane oils (d) 0 to 20 parts of a pigment and 0 to 20 parts of a stabilizer consisting essentially of an octoate of iron, cerium or manganese, the total amount of pigment and stabilizer being not more than 20 parts (e) 0.2-5 parts of 2,4-dichlorobenzoyl peroxide, 0.0-(tertiary butyl) o-isopropyl percarbonate or 2,5-dimethyl-2,4-di-(tertiary butyl) peroxyhexane (f) 0.001-0.01 parts of a platinium compound which is chloroplatinic acid, a reaction product thereof with an alcohol or aldehyde or a platinum chloride/olefin complex (g) either (i) 3-35 parts of an oxide of cerium, lanthanum, neodymium or praseodymium or (ii) 1-8 parts of a hydroxide of cerium, neodymium or praseodymium and 0-5 parts of magnesium oxide.
Claim 8
Dependent Claim
17 words
An elastomer prepared by heating at 100* - 300*C an organopolysiloxane composition as claimed in claim 1.
Claim 9
Dependent Claim
18 words
An elastomer according to claim 9 wherein the polymer chain in rubber (a) is terminated with trimethylsiloxy radicals.
Claim 10
Dependent Claim
28 words
An elastomer according to claim 9 wherein the filler has been treated with an organosilicon compound selected from the group consisting of octamethyl cyclotetrasiloxane hexamethyldisilazane, trimethylchlorosilane and dimethylvinylchlorosilane.
Claim 11
Dependent Claim
31 words
An elastomer according to claim 9 comprising up to 20 parts of an organosilicon plasticizer selected from the group consisting of silanes with hydrolysable groups or hydrolysed or alkoxylated diorganopolysiloxane oils.
Claim 12
Dependent Claim
29 words
An elastomer according to claim 9 wherein the platinium compound is chloroplatinic acid, a platinum chloride/olefin complex or the reaction product of chloroplatinic acid and an alcohol or aldehyde.
Claim 13
Dependent Claim
22 words
An elastomer according to claim 9 wherein the rare earth metal is at least onE of cerium, lanthanum, neodymium, praseodymium and samarium.
Claim 14
Dependent Claim
29 words
An elastomer according to claim 14 comprising 1 to 8 parts in total of at least one rare earth metal hydroxide and up to 5 parts of magnesium oxide.
Claim 15
Dependent Claim
13 words
An elastomer prepared by heating an organopolysiloxane composition as claimed in claim 8.
Claim 16
Dependent Claim
45 words
A composition according to claim 1 comprising 0 to 20 parts of a pigment and 0 to 20 parts of a stabiliser consisting essentially of an octoate of iron, cerium or manganese, the total amount of pigment and stabiliser being not more than 20 parts.
Claim 17
Dependent Claim
45 words
An elastomer according to claim 9 comprising 0 to 20 parts of a pigment and 0 to 20 parts of a stabiliser consisting essentially of an octoate of iron, cerium or manganese, the total amount of pigment and stabiliser being not more than 20 parts.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |