Patent US3674763A successfully refreshed from Google Patents.
US3674763A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for curing fluoroelastomer
Assignee: Daikin Industries Ltd
•
Filing: 1970-12-28
•
Granted: 1972-07-04
•
Expires: 1990-12-28
Abstract
Abstract A process for curing fluoroelastomer by curing a fluoroelastomer on heating in the presence of both N,N''-dicinnamylidene-1,6hexylenediamine and para-phenylenediamine as a curing agent. By the use of both N,N''-cinnamylidene-1,6-hexylenediamine and paraphenylenediamine can give an extremely faster curing velocity than that in case of using each alone.
Inventors
- 👤 Naoya Nakamura
- 👤 Miyata Yasuo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:19
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/17; C08J; C08J3/00; C08J3/24; C08J3/247; C08J2327/00; C08J2327/02; C08J2327/12; C08J2327/16
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
17 words
The process of claim 1, wherein the said fluoroelastomer is a copolymer of vinylidene fluoride and fluoro-olefin.
Claim 2
Dependent Claim
31 words
The process of claim 2, wherein a ratio of vinylidene fluoride unit and fluoro-olefin unit in the said copolymer is one selected from the range of 10:90 to 95:5 by weight.
Claim 3
Dependent Claim
28 words
The process of claim 2, wherein the said fluoro-olefin is at least one member selected from the group consisting of hexafluoropropylene, pentafluoropropylene, trifluroethylene, trifluorochloroethylene, tetrafluoroethylene and vinyl fluoride.
Claim 4
Dependent Claim
48 words
The process of claim 1, wherein the said N,N''-dicinnamylidene-1,6-hexylenediamine is employed in a ratio of 0.3 to 4 parts, the said Para-phenylenediamine is employed in a ratio of 0.3 to 3 parts and totally 1 to 5 parts by weight to 100 parts by weight of the fluoroelastomer.
Claim 5
Dependent Claim
22 words
The process of claim 1, wherein the said N,N''-dicinnamylidene-1,6-hexylenediamine and para-phenylenediamine are employed in a ratio of 30:70 to 95:5 by weight.
Claim 6
Dependent Claim
42 words
The process of claim 1, wherein a composition comprising the said fluoroelastomer and the said curing agent is subjected to roll milling, the press cure by heating in a mold under compression at an elevated temperature, and then to the oven cure.
Claim 7
Dependent Claim
66 words
The process of claim 7, wherein the said press cure is carried out under a condition of a temperature of 100* to 180* C., a period of 10 to 180 minutes and a pressure of 20 to 100 kg./cm2., and the said oven cure is carried out under a condition of a temperature of 150* to 250* C. and a period of 5 to 30 hours.
Claim 8
Dependent Claim
43 words
The process of claim 1, wherein a composition comprising the said fluoroelastomer and the said curing agent is dissolved or dispersed into a solvent and applied on a surface of shaped article, and then the resultant shaped article is heated to obtain curing.
Claim 9
Dependent Claim
33 words
The process of claim 9, wherein the said solvent is at least one member selected from the group consisting of methyl ethyl ketone, acetone, cyclohexanone, methyl ethyl ether, diethyl ether, dioxane and tetrahydrofuran.
Claim 10
Dependent Claim
32 words
The process of claim 10, wherein the said shaped article is at least one member selected from the group consisting of paper, fiber, film, sheet, plate, tube, pipe, tank and large-sized vessel.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |