US3694427A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Curable silox anol-silacyclobutane composition
Assignee: Dow Silicones UK Ltd
•
Filing: 1971-03-12
•
Granted: 1972-09-26
•
Expires: 1991-03-12
Abstract
Abstract Siloxane polymers containing an average of at least two hydroxyl groups bonded to silicon in each molecule can be cured employing silacyclobutanes of the general formula WHERE R is H or alkyl of one to six carbons, R'' and R'''' are each hydrocarbyl, halogenohydrocarbyl or a radical reactive with *SiOH, at least one R'' or R'''' being such a reactive radical. The composition can be illustrated by a mixture of hydroxyl endblocked dimethylpolysiloxane and 1,1-dimethoxy-1silacyclobutane. The products are useful as silicone rubbers, resins and adhesives.
Inventors
- 👤 David Andrew Jonas
- 👤 William John Owen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:28
CPC Classifications
C; C08; C08L; C08L83/00; C08L83/04; C08G; C08G77/00; C08G77/04; C08G77/14; C08G77/16; C08G77/20; C08G77/22; C08G77/24; C08G77/26; C08G77/70
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
29 words
A composition as claimed in claim 1 wherein at least 50 percent of the organic radicals in the organopolysiloxane (A) are methyl radicals, phenyl radicals or a mixture thereof.
Claim 2
Dependent Claim
19 words
A composition as claimed in claim 1 wherein the organopolysiloxane (A) is a diorganopolysiloxane having terminal silicon-bonded hydroxyl radicals.
Claim 3
Dependent Claim
52 words
A composition as claimed in claim 3 wherein the diorganopolysiloxane has the general formula HO(Z2SiO)yH wherein y is an integer such that the viscosity of the diorganopolysiloxane is greater than 500 cs. at 25* C. and the Z radicals are predominantly methyl radicals, any remaining Z radicals being phenyl and/or vinyl radicals.
Claim 4
Dependent Claim
20 words
A composition as claimed in claim 1 wherein R'' and R'''' are alkoxy radicals having less than six carbon atoms.
Claim 5
Dependent Claim
28 words
A composition as claimed in claim 1 wherein (B) is present in a proportion of from 0.5 to 5 percent by weight based on the weight of (A).
Claim 6
Dependent Claim
52 words
A composition as claimed in claim 1 in which there is also incorporated (C) a material which is effective in promoting the opening of the silacyclobutane ring structure and is selected from the group consisting of chloroplatinic acid, chloroplatinic acid complexes, aluminum chloride, organometallic compounds, acids, bases, acid clays and fume silica.
Claim 7
Dependent Claim
32 words
A composition as claimed in claim 7 wherein (C) is an organometallic compound selected from the group consisting of stannous octoate, stannous acetate, dibutyl tin dilaurate, dibutyl tin diacetate and dicobalt octacarbonyl.
Claim 8
Dependent Claim
13 words
A composition as claimed in claim 1 also containing (C) a tin carboxylate.
References Cited (Backward Citations)
US3445495A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |