Patent US6049702A successfully refreshed from Google Patents.
Patent US2700136A successfully refreshed from Google Patents.
Patent US3900380A successfully refreshed from Google Patents.
US3900380A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of fluorinated cyclobutenyl alkyl ether copolymers
Assignee: Dow Chemical Co
•
Filing: 1974-03-21
•
Granted: 1975-08-19
•
Expires: 1994-03-21
Abstract
Abstract Disclosed are highly fluorinated polymers of the formula: In the above formula, Rf and Rf'' are straight or branched chain perfluoroalkyl groups or perfluoroalkyl ethers having a combined number of carbon atoms totaling from 3 to 20, n is a number of from 2 to 10,000 representing the degree of polymerization and the ratio of x:y ranges from 0.001:1 to 1000:1. The polymers are thermally stable and flexible. In addition they contain double bonds as crosslinking sites.
Inventors
- 👤 Richard W Anderson
- 👤 Hughie R Frick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:30
CPC Classifications
C; C08; C08G; C08G61/00; C08G61/12; C08G61/121; C07; C07C; C07C29/00; C07C29/68; C07C41/00; C07C41/01; C07C41/05; C07C41/06; C08G65/00; C08G65/34
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
79 words
A PROCESS FOR THE PREPARTION OF A HIGHLY FLUORINATED POLYMER OF THE FORMULA: I-((PERFLUOROCYCLOBUTENYLENE)X-(RF-O-RF'')Y)N-I DI(I-)PERFLUOROCYCLOBUTENE WHEREIN RF AND RF'' ARE STRAIGHT OR BRANCHED CHAIN PERFLUOROALKYL GROUPS OR PERFLUOROALKYL ETHERS HAVING A COMBINED NUMBER OF CARBON ATOMS TOTALING FROM 3 TO 20, N IS A NUMBER FROM 2 TO 10,000 REPRESENTING THE DEGREE OF POLYMERIZATION AND THE RATIO OF X:Y RANGES FROM 0.001:1, WHICH COMPRISES REACTING IN THE PRESENCE OF MERCURY AND ULTRAVIOLET LIGHT A DIIODO PERFLUOROXYCLOBUTENE OF THE FORMULA
Claim 2
Dependent Claim
79 words
A PROCESS FOR THE PREPARTION OF A HIGHLY FLUORINATED POLYMER OF THE FORMULA: I-((PERFLUOROCYCLOBUTENYLENE)X-(RF-O-RF'')Y)N-I DI(I-)PERFLUOROCYCLOBUTENE WHEREIN RF AND RF'' ARE STRAIGHT OR BRANCHED CHAIN PERFLUOROALKYL GROUPS OR PERFLUOROALKYL ETHERS HAVING A COMBINED NUMBER OF CARBON ATOMS TOTALING FROM 3 TO 20, N IS A NUMBER FROM 2 TO 10,000 REPRESENTING THE DEGREE OF POLYMERIZATION AND THE RATIO OF X:Y RANGES FROM 0.001:1, WHICH COMPRISES REACTING IN THE PRESENCE OF MERCURY AND ULTRAVIOLET LIGHT A DIIODO PERFLUOROXYCLOBUTENE OF THE FORMULA
Claim 3
Dependent Claim
17 words
The process of claim 1 wherein the temperature is maintained at a level from -30* to 250*C.
Claim 4
Dependent Claim
27 words
The process of claim 1 wherein the perfluorocyclobutene and iodo terminated perfluoroalkyl ether are reacted in a solvent capable of disolving the reactants and the resulting product.
References Cited (Backward Citations)
US3228864A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |