Patent US4613657A successfully refreshed from Google Patents.
US4613657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for anionic homopolymerization of α-trifluoromethylacrylate
Assignee: Central Glass Co Ltd
•
Filing: 1986-02-06
•
Granted: 1986-09-23
•
Expires: 2006-02-06
Abstract
Abstract A methanol-insoluble homopolymer of an α-trifluoromethylacrylate, which has either an alkyl group or a fluorine-containing alkyl group in the ester radical, is formed at good yields in an organic aprotic solvent by using an alkali metal alkoxide, e.g. lithium t-butoxide, as anionic polymerization catalyst.
Inventors
- 👤 Tadashi Narita
- 👤 Tokio Hagiwara
- 👤 Hiroshi Hamana
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:31
CPC Classifications
C; C08; C08F; C08F120/00; C08F120/02; C08F120/10; C08F120/22; C08F120/24
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
74 words
A method of preparing a homopolymer of an α-trifluoromethylacrylate represented by the general formula (1). comprising the step of keeping the monomer of said α-trifluoromethylacrylate dissolved in an organic solvent in the presence of an anionic polymerization catalyst which is an alkoxide represented by the general formula (2): ##STR3## wherein R represents an alkyl group or a fluorine-containing alkyl group: R'OM (2) wherein R' represents an alkyl group and M represents an alkali metal.
Claim 2
Independent Claim
74 words
A method of preparing a homopolymer of an α-trifluoromethylacrylate represented by the general formula (1). comprising the step of keeping the monomer of said α-trifluoromethylacrylate dissolved in an organic solvent in the presence of an anionic polymerization catalyst which is an alkoxide represented by the general formula (2): ##STR3## wherein R represents an alkyl group or a fluorine-containing alkyl group: R'OM (2) wherein R' represents an alkyl group and M represents an alkali metal.
Claim 3
Dependent Claim
36 words
A method according to claim 1, wherein R' in the general formula (2) represents an alkyl group having not more than 4 carbon atoms, and M in the general formula (2) represents Li, Na or K.
Claim 4
Dependent Claim
21 words
A method according to claim 1, wherein said alkoxide is selected from the group consisting of lithium t-butoxide and potassium t-butoxide.
Claim 5
Dependent Claim
22 words
A method according to claim 1, wherein said anionic polymerization catalyst amounts to 0.01-5 mol % of said monomer of said α-trifluoromethylacrylate.
Claim 6
Dependent Claim
31 words
A method according to claim 1, wherein said α-trifluoromethylacrylate is selected from the group consisting of methyl α-trifluoromethylacrylate, ethyl α-trifluoromethylacrylate, n-propyl α-trifluoromethylacrylate, isopropyl α-trifluoromethylacrylate, n-butyl α-trifluoromethylacrylate, t-butyl α-trifluoromethylacrylate and 2-ethylhexyl α-trifluoromethylacrylate.
Claim 7
Dependent Claim
31 words
A method according to claim 1, wherein said α-trifluoromethylacrylate is selected from the group consisting of 2,2,2-trifluoroethyl α-trifluoromethylacrylate, 1H,1H-heptafluorobutyl α-trifluoromethylacrylate, 1H,1H,7H-dodecafluoroheptyl α-trifluoromethylacrylate, 1H,1H-pentadecafluorooctyl α-trifluoromethylacrylate, 1H,1H-pentafluoropropyl α-trifluoromethylacrylate, 1H,1H-heptafluorobutyl α-trifluoromethylacrylate and hexafluoroisopropyl α-trifluoromethylacrylate.
Claim 8
Dependent Claim
14 words
A method according to claim 1, wherein said organic solvent is an aprotic solvent.
Claim 9
Dependent Claim
29 words
A method according to claim 7, wherein said organic solvent is selected from the group consisting of n-hexane, n-heptane, benzene, toluene, xylene, ethyl ether, di-n-butyl ether, tetrahydrofuran and dioxane.
Claim 10
Dependent Claim
38 words
A method according to claim 1, wherein the reaction system comprised of said monomer, said organic solvent and said anionic polymerization catalyst is kept at a temperature in the range from about -78° C. to about 100° C.
Claim 11
Dependent Claim
19 words
A method according to claim 9, wherein said temperature is in the range from -50° C. to 80° C.
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) | 1989-09-22 | 1990-03-24 | 1990-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-22 | 1994-03-24 | 1994-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-22 | 1998-03-24 | 1998-09-23 | $7700.00 | Window Closed / Lapsed |