Patent US4772675A successfully refreshed from Google Patents.
US4772675A
Expired / Lapsed
US
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Methods of improving shelf life of silicone elastomeric sealant
Assignee: Dow Silicones Corp
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Filing: 1988-01-28
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Granted: 1988-09-20
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Expires: 2008-01-28
Abstract
Abstract The method of this invention produces an elastomeric silicone sealant having an improved shelf life. The sealant comprises an alkoxysilethylene ended polydiorganosiloxane polymer, an alkoxytrialkoxysilane crosslinker, and a titanium catalyst.
Inventors
- 👤 Jerome M. Klosowski
- 👤 Michael D. Meddaugh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:00
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/10; C09K3/1006; C09K3/1018; C08; C08K; C08K5/00; C08K5/54; C08K5/541; C08K5/5415; C08L; C08L83/00; C08L83/14; C09K2003/1034; C09K2003/1053; Y; Y10; Y10S; Y10S528/00; Y10S528/901
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
126 words
A method of producing an endcapping composition comprising (A) mixing 1 mol of a composition (a) of the formula ##STR22## where R is methyl, ethyl, propyl, phenyl, or trifluoropropyl, R" is methyl, ethyl, propyl, or butyl, and a is 0 or 1, with greater than 2 mols of a composition (b) of the formula ##STR23## where R is as stated above and c is from 1 to 6, in the presence of a platinum catalyst and allowing to react, then, (B) optionally stripping the excess composition (b) from the product, to give an endcapping composition of the formula ##STR24## where R is methyl, ethyl, propyl, phenyl, or trifluoropropyl, R" is methyl, ethyl, propyl, or butyl, a is 0 or 1, and c is 1 to 6.
Claim 2
Independent Claim
126 words
A method of producing an endcapping composition comprising (A) mixing 1 mol of a composition (a) of the formula ##STR22## where R is methyl, ethyl, propyl, phenyl, or trifluoropropyl, R" is methyl, ethyl, propyl, or butyl, and a is 0 or 1, with greater than 2 mols of a composition (b) of the formula ##STR23## where R is as stated above and c is from 1 to 6, in the presence of a platinum catalyst and allowing to react, then, (B) optionally stripping the excess composition (b) from the product, to give an endcapping composition of the formula ##STR24## where R is methyl, ethyl, propyl, phenyl, or trifluoropropyl, R" is methyl, ethyl, propyl, or butyl, a is 0 or 1, and c is 1 to 6.
Claim 3
Dependent Claim
14 words
The method of claim 1 in which composition (b) has c equal to 1.
Claim 4
Dependent Claim
15 words
The method of claim 2 in in which composition (a) has a equal to 0.
Claim 5
Dependent Claim
33 words
The product having the formula, ##STR25## where R is methyl, ethyl, propyl, phenyl, or trifluoropropyl, R" is methyl, ethyl, propyl, or butyl, a is 0 or 1, and c is 1 to 6.
Claim 6
Dependent Claim
33 words
The product having the formula, ##STR25## where R is methyl, ethyl, propyl, phenyl, or trifluoropropyl, R" is methyl, ethyl, propyl, or butyl, a is 0 or 1, and c is 1 to 6.
Claim 7
Dependent Claim
12 words
The product as claimed in claim 4 in which c is 1.
Claim 8
Dependent Claim
12 words
The product as claimed in claim 5 in which a is 0.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-20 | 1992-03-21 | 1992-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-20 | 1996-03-21 | 1996-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-20 | 2000-03-21 | 2000-09-20 | $7700.00 | Window Closed / Lapsed |