US4736004A
Expired / Lapsed
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Persistent perfluoroalkyl free radicals useful as polymerization catalyst
Assignee: Tanabe Pharma Corp
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Filing: 1986-05-28
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Granted: 1988-04-05
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Expires: 2006-05-28
Abstract
Abstract Novel persistent perfluorinated free radicals are disclosed, which upon thermal decomposition yield free radicals which can be used to polymerize polymerizable monomers containing ethylenic unsaturation.
Inventors
- 👤 Kirby V. Scherer, Jr.
- 👤 Taizo Ono
- 👤 Kouichi Yamanouchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:09
CPC Classifications
C; C08; C08F; C08F4/00
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
64 words
In a process for free radical-catalyzed polymerization of a monomer containing ethylenic unsaturation in an aqueous, a non-aqueous or a gaseous medium, the improvement which comprises catalyzing said polymerization with a catalytically effective amount of a persistent perfluoroalkyl tertiary free radical having 8 to 12 carbon atoms and at least one secondary or tertiary perfluorinated alkyl group attached directly to the central tri-valent carbon.
Claim 2
Dependent Claim
64 words
In a process for free radical-catalyzed polymerization of a monomer containing ethylenic unsaturation in an aqueous, a non-aqueous or a gaseous medium, the improvement which comprises catalyzing said polymerization with a catalytically effective amount of a persistent perfluoroalkyl tertiary free radical having 8 to 12 carbon atoms and at least one secondary or tertiary perfluorinated alkyl group attached directly to the central tri-valent carbon.
Claim 3
Dependent Claim
65 words
The process of claim 1 using a free radical having the general formula ##STR12## wherein each of R 7 , R 8 and R 9 is a perfluorinated alkyl group, with at least one of R 7 , R 8 and R 9 being a being a secondary or tertiary group and the total carbon atoms present in the radical being from 8 to 12.
Claim 4
Dependent Claim
23 words
The process of claim 2 wherein at least two of R 7 , R 8 and R 9 are secondary perfluorinated alkyl groups.
Claim 5
Dependent Claim
23 words
The process of claim 2 wherein at least two of R 7 , R 8 and R 9 are tertiary perfluorinated alkyl groups.
Claim 6
Dependent Claim
47 words
The process of claim 1 using a free radical of the general formula (VII) ##STR13## wherein R 1 and R 2 each independently represent a fluorine atom, a trifluoromethyl group or a trifluoroethyl group, with the free radical having a total carbon number of 8 to 12.
Claim 7
Dependent Claim
15 words
The process of claim 5 wherein the free radical has 8 to 10 carbon atoms.
Claim 8
Dependent Claim
13 words
The process of claim 1 using a free radical having the formula ##STR14##
Claim 9
Dependent Claim
13 words
The process of claim 1 using a free radical having the formula ##STR15##
Claim 10
Dependent Claim
13 words
The process of claim 1 using a free radical having the formula ##STR16##
Claim 11
Dependent Claim
36 words
The process of claim 1 wherein said polymerization is carried out at a temperature of from about room temperature up to about 300° C. under a pressure of about atmospheric pressure up to about 3,000 atmospheres.
Claim 12
Dependent Claim
18 words
The process of claim 1 wherein 0.01% to 2.0% of the free radical is used as a catalyst.
Claim 13
Dependent Claim
11 words
The process of claim 1 wherein said monomer is an olefin.
Claim 14
Dependent Claim
12 words
The process of claim 1 wherein the monomer is a halogenated olefin.
Claim 15
Dependent Claim
10 words
The process of claim 13 wherein the monomer is perhalogenated.
Claim 16
Dependent Claim
20 words
The process of claim 14 wherein the halogen atoms are selected from the group consisting of chlorine and fluorine atoms.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-05 | 1991-10-05 | 1992-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-05 | 1995-10-05 | 1996-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-05 | 1999-10-05 | 2000-04-05 | $7700.00 | Window Closed / Lapsed |