Patent US4296228A successfully refreshed from Google Patents.
US4296228A
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Room temperature curable compositions
Assignee: Wacker Chemie AG
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Filing: 1980-03-03
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Granted: 1981-10-20
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Expires: 2000-03-03
Abstract
Abstract Room temperature curable compositions, which can be stored under anhydrous conditions, but when exposed to atmospheric moisture at room temperature cure to an elastomer comprising a diorganopolysiloxane having terminal condensable groups, a silicon compound containing acetoxy, tert-butoxy and SiC-bonded alkyl groups and a condensation catalyst, if desired, in which at least a portion of the silicon compound containing acetoxy, tert-butoxy and SiC-bonded alkyl groups is obtained from the reaction of an alkyltriacetoxysilane and tert-butanol in aqueous acetic acid.
Inventors
- 👤 Ernst Innertsberger
- 👤 Oswin Sommer
- 👤 Erhard Bosch
- 👤 Johann Muller
- 👤 August Schiller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:52
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/54; C08G; C08G77/00; C08G77/04; C08G77/14; C08G77/16; C08G77/18; C08G77/42; C08G77/44; C08G77/70; Y; Y10; Y10S; Y10S528/00; Y10S528/901
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
73 words
A curable composition which is stable under anhydrous conditions but when exposed to moisture at room temperature, cures to an elastomer comprising a diorganopolysiloxane having terminal condensable groups and a silicon compound containing acetoxy, tert-butoxy and SiC-bonded alkyl groups, in which at least a portion of the silicon compound containing acetoxy, tert-butoxy and SiC-bonded alkyl groups is obtained from the reaction of an alkyltriacetoxysilane with tert-butanol in the presence of aqueous acetic acid.
Claim 2
Dependent Claim
73 words
A curable composition which is stable under anhydrous conditions but when exposed to moisture at room temperature, cures to an elastomer comprising a diorganopolysiloxane having terminal condensable groups and a silicon compound containing acetoxy, tert-butoxy and SiC-bonded alkyl groups, in which at least a portion of the silicon compound containing acetoxy, tert-butoxy and SiC-bonded alkyl groups is obtained from the reaction of an alkyltriacetoxysilane with tert-butanol in the presence of aqueous acetic acid.
Claim 3
Dependent Claim
16 words
The curable composition of claim 1, wherein a condensation catalyst is added to the curable composition.
Claim 4
Dependent Claim
74 words
The curable composition of claim 1, wherein in the prepation of the silicon compound the amount of tert-butanol is from 0.16 to 0.2 mole per mole of alkyltriacetoxysilane; the amount of aqueous acetic acid is from 0.35 to 0.7 mole of H 2 O per mole of alkyltriacetoxysilane; and the amount of acetic acid in the aqueous acetic acid is from 0.1 to 2 mole of CH 3 COOH (anhydrous) per mole of water.
Claim 5
Dependent Claim
50 words
The curable composition of claim 1, wherein the diorganopolysiloxane is represented by the formula HO(SiR 2 O) n SiR 2 OH where R is selected from the group consisting of monovalent hydrocarbon radicals, substituted monovalent hydrocarbon radicals and polymeric hydrocarbon radicals and n is a number of at least 10.
Claim 6
Dependent Claim
14 words
A cured elastomer obtained from the composition of claim 1 upon exposure to moisture.
Claim 7
Independent Claim
71 words
A method for preparing a composition which is stable under anhydrous conditions, but when exposed to moisture at room temperature cures to an elastomer which comprises mixing a diorganopolysiloxane having terminal condensable groups with a silicon compound containing acetoxy, tert-butoxy and SiC-bonded alkyl groups, in which at least a portion of the silicon compound is obtained from the reaction of an alkyltriacetoxysilane and tert-butanol in the presence of aqueous acetic acid.
Claim 8
Independent Claim
71 words
A method for preparing a composition which is stable under anhydrous conditions, but when exposed to moisture at room temperature cures to an elastomer which comprises mixing a diorganopolysiloxane having terminal condensable groups with a silicon compound containing acetoxy, tert-butoxy and SiC-bonded alkyl groups, in which at least a portion of the silicon compound is obtained from the reaction of an alkyltriacetoxysilane and tert-butanol in the presence of aqueous acetic acid.
Claim 9
Dependent Claim
12 words
The method of claim 6, wherein a condensation catalyst is incorporated therein.
Claim 10
Dependent Claim
73 words
The method of claim 6, wherein in the preparation of the silicon compound the amount of tert-butanol is from 0.16 to 0.2 mole per mole of alkyltriacetoxysilane; the amount of aqueous acetic acid is from 0.35 to 0.7 mole of H 2 O per mole of alkyltriacetoxysilane; and the amount of acetic acid in the aqueous acetic acid is from 0.1 to 2 mole of CH 3 COOH (anhydrous) per mole of water.
Claim 11
Dependent Claim
17 words
A method for curing the composition of claim 1, which comprises exposing the composition to atmospheric moisture.
Claim 12
Dependent Claim
17 words
A method for curing the composition of claim 2, which comprises exposing the composition to atmospheric moisture.
References Cited (Backward Citations)
US3296195A
Cited
US3886118A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-19 | 1985-04-20 | 1985-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-19 | 1989-04-20 | 1989-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-19 | 1993-04-20 | 1993-10-20 | $7700.00 | Window Closed / Lapsed |