US4229548A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of organopolysiloxane moulding compositions which give fine-pored elastomeric foam mouldings
Assignee: Momentive Performance Materials GmbH
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Filing: 1979-07-16
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Granted: 1980-10-21
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Expires: 1999-07-16
Abstract
Abstract In a process for the production of a plastic organopolysiloxane molding composition which can be stored under pressure and with exclusion of moisture, and which, on release of the pressure and under the action of water or atmospheric moisture, is converted into an elastomeric, fine-pored foam molding or foam coating, which comprises forming a mixture of an α,ω-dihydroxypolydiorganopolysiloxane with a silicon-containing crosslinking agent, introducing the mixture into the inner container of a two-container pack which consists of a rigid outer container and a flexible inner container located within the outer container and provided with a dispensing valve which extends to the exterior, and placing the mixture under pressure.
Inventors
- 👤 Hans Sattlegger
- 👤 Hermann Schmidt
- 👤 Karl Schnurrbusch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:20
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08L; C08L83/00; C08L83/04; C09; C09K; C09K3/00; C09K3/30; C08G; C08G77/00; C08G77/04; C08G77/14; C08G77/16; C08J2383/00; C08J2383/04; Y; Y10; Y10S; Y10S521/00; Y10S521/917; Y10S528/00; Y10S528/901
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
119 words
In a process for the production of a plastic organopolysiloxane molding composition which can be stored under pressure and with exclusion of moisture, and which, on release of the pressure and under the action of water or atmospheric moisture, is converted into an elastomeric, fine-pored foam molding or foam coating, which comprises forming an mixture of an α,ω-dihydroxypolydiorganopolysiloxane with a silicon-containing crosslinking agent, introducing the mixture into the inner container of a two-container pack which consists of a rigid outer container and a flexible inner container located within the outer container and provided with a dispensing valve which extends to the exterior, and placing the mixture under a moisture-free inert gaseous pressure of about 2 to about 30 bar.
Claim 2
Dependent Claim
119 words
In a process for the production of a plastic organopolysiloxane molding composition which can be stored under pressure and with exclusion of moisture, and which, on release of the pressure and under the action of water or atmospheric moisture, is converted into an elastomeric, fine-pored foam molding or foam coating, which comprises forming an mixture of an α,ω-dihydroxypolydiorganopolysiloxane with a silicon-containing crosslinking agent, introducing the mixture into the inner container of a two-container pack which consists of a rigid outer container and a flexible inner container located within the outer container and provided with a dispensing valve which extends to the exterior, and placing the mixture under a moisture-free inert gaseous pressure of about 2 to about 30 bar.
Claim 3
Dependent Claim
21 words
A process as claimed in claim 1 wherein the α,ω-dihydroxypolydiorganosiloxane is one containing an alkyl, halogenoalkyl, alkenyl, cycloalkyl or aryl group.
Claim 4
Dependent Claim
24 words
A process as claimed in claim 1 wherein the α,ω-dihydroxypolydiorganosiloxane is one having a viscosity at 20° C. between 500 and 2,000,000 cSt/20° C.
Claim 5
Dependent Claim
26 words
A process as claimed in claim 1 wherein the α,ω-dihydroxypolydiorganosiloxane is present in an amount of 10 to 90% by weight, based on the total mixture.
Claim 6
Dependent Claim
55 words
A process as claimed in claim 1 wherein the crosslinking agent is one having the general formula R.sub.a SiX.sub.4-a (I) wherein a is from 0 to 2, R represents an alkyl, alkenyl or aryl radical or a corresponding halogenated radical, and X represents a group capable of reacting with a silanol group of the α,ω-dihydroxypolydiorganosiloxane.
Claim 7
Dependent Claim
22 words
A process as claimed in claim 5 wherin the group X is an alkoxy, acyloxy, amino, cycloamino, acid amide or oxime group.
Claim 8
Dependent Claim
37 words
A process as claimed in any of claims 1 to 4 whereinin the crosslinking agent is a disiloxane, trisiloxane or polysiloxane producible by the partial hydrolysis of a compound of general formula I given in claim 5.
Claim 9
Dependent Claim
33 words
A process as claimed in claim 7 wherein the cross-linking agent is a compound of the general formula R.sub.a X.sub.3-a Si-O-SiX.sub.3-a R.sub.a wherein R, a and X are as defined in claim 5.
Claim 10
Dependent Claim
31 words
A process as claimed in claim 7, wherein the mixture additionally contains solvents one or more plasticizers, fillers and/or crosslinking catalysts and additives to improve fungistatic activity, physical and mechanical properties.
Claim 11
Dependent Claim
27 words
A process as claimed in claim 1 wherein there is also introduced into the inner container a gas which is inert to the constituents of the mixture.
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) | 1983-10-21 | 1984-04-21 | 1984-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-21 | 1988-04-21 | 1988-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-21 | 1992-04-21 | 1992-10-21 | $7700.00 | Window Closed / Lapsed |