US3906018A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polysiloxane carbamate compounds
Assignee: Union Carbide Corp
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Filing: 1972-05-10
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Granted: 1975-09-16
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Expires: 1992-05-10
Abstract
Abstract An organopolysiloxane polymer free from hydroxyl radicals, which contains at least one carbamate radical having the formula wherein R1 is hydrogen or a monovalent hydrocarbon radical; R2 is a monovalent hydrocarbon radical, all carbamate radicals of said polymer being directly bonded to a terminal silicon atom of said polymer; said polymers are useful as protective coatings to render materials water-repellant and as intermediates in preparing siloxane fluids and oils.
Inventors
- 👤 Robert Leopold Ostrozynski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 15:05
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/38; C08G77/382; C08G77/388
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
19 words
AN ESSENTIALLY LINEAR ORGANOPOLYSILOXANE POLYMER, FREE FROM HYDROXYL RADICALS WHICH CONTAINS AT LEAST ONE N,N-DIORGANOCARBAMATE RADICAL OF THE FORMULA
Claim 2
Dependent Claim
19 words
AN ESSENTIALLY LINEAR ORGANOPOLYSILOXANE POLYMER, FREE FROM HYDROXYL RADICALS WHICH CONTAINS AT LEAST ONE N,N-DIORGANOCARBAMATE RADICAL OF THE FORMULA
Claim 3
Dependent Claim
15 words
An organopolysiloxane polymer as defined in claim 1 wherein R1 and R2 are methyl radicals.
Claim 4
Dependent Claim
60 words
An organosilicon polymer as defined in claim 1, having the average formula R''R2NCOO(R)2SiO((R)2SiO)pSi(R)2OOCNR''R2 wherein R is a radical selected from the group consisting of hydrogen, monovalent hydrocarbon radicals and substituted monovalent hydrocarbon radicals wherein the substituents are selected from the class consisting of halogen, nitro, cyano and alkoxy radicals, and wherein p has an average value of 0 to 1000.
Claim 5
Dependent Claim
26 words
An essentially linear organopolysiloxane polymer as defined in claim 3 wherein R1 and R2 are lower alkyl radicals and wherein R is a monovalent hydrocarbon radical.
Claim 6
Dependent Claim
32 words
An organopolysiloxane polymer as defined in claim 4, wherein R1 and R2 are methyl radicals; wherein R is a lower alkyl radical and wherein p has a value of at least 4.
Claim 7
Dependent Claim
14 words
An organopolysiloxane polymer as defined in claim 5, wherein R is a methyl radical.
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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) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |