Patent US4298699A successfully refreshed from Google Patents.
US4298699A
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Process for producing fluorinated polymer having ion-exchange groups
Assignee: AGC Inc
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Filing: 1980-02-07
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Granted: 1981-11-03
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Expires: 2000-02-07
Abstract
Abstract A fluorinated copolymer having ion-exchange group is produced by copolymerizing a fluorinated ethylenic unsaturated monomer and a functional monomer having a functional group of carboxylic acid group or a group which can be converted to carboxylic acid group in an aqueous medium in the presence of a polymerization initiator source. The fluorinated copolymer obtained by the copolymerization is treated with an alcohol at higher than 20° C. in the form of particles before a molding. The melt flowability of the fluorinated copolymer is improved.
Inventors
- 👤 Tatsuro Asawa
- 👤 Haruhisa Miyake
- 👤 Masami Yamashita
- 👤 Yoshio Sugaya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:09
CPC Classifications
C; C08; C08F; C08F214/00; C08F214/18; C08F214/184
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
75 words
A process for producing a fluorinated copolymer having ion-exchange groups, comprising: copolymerizing a fluorinated ethylenic unsaturated monomer and a monomer having a carboxylic acid group or group convertible to a carboxylic acid group in an aqueous solution in the presence of a polymerization initiator: treating the particles of copolymer product obtained with an alcohol at a temperature greater than 20° C.; and drying said alcohol treated particles, thereby substantially removing said alcohol from said particles.
Claim 2
Dependent Claim
75 words
A process for producing a fluorinated copolymer having ion-exchange groups, comprising: copolymerizing a fluorinated ethylenic unsaturated monomer and a monomer having a carboxylic acid group or group convertible to a carboxylic acid group in an aqueous solution in the presence of a polymerization initiator: treating the particles of copolymer product obtained with an alcohol at a temperature greater than 20° C.; and drying said alcohol treated particles, thereby substantially removing said alcohol from said particles.
Claim 3
Dependent Claim
34 words
The process according to claim 1, wherein the fluorinated copolymer is granular and said alcohol treatment is conducted by stirring said granular copolymer in a large amount of an alcohol at an elevated temperature.
Claim 4
Dependent Claim
23 words
The process according to claim 1, wherein said alcohol treatment is conducted by incorporating a small amount of an acid in an alcohol.
Claim 5
Dependent Claim
118 words
The process according to claim 1, wherein the functional monomer is a fluorovinyl compound having the formula CF.sub.2 ═CX--CFX').sub.p (OCF.sub.2 CFY).sub.l (O).sub.m (CFY').sub.n A wherein p is 0 or 1; l is 0 to 3; m is 0 to 1; n is 0 to 12; X represents --F, --Cl or --CF 3 ; X' represents --F or --CF 3 ; Y and Y' each represent --F or a C 1-10 perfluoroalkyl group; A represents --CN, --COF, --COOH, --COOR 1 , --COOM or --COONR 2 R 3 ; R 1 represents a C 1-10 alkyl group; R 2 and R 3 each represent --H or R 1 ; M represents an alkali metal atom or a quaternary ammonium group.
Claim 6
Dependent Claim
34 words
The process according to claim 1, wherein the fluorinated ethylenic unsaturated monomer is a fluorinated olefin having the formula CF.sub.2 ═CZZ' wherein Z and Z' each represent --F, --Cl, --H or --CF 3 .
Claim 7
Dependent Claim
52 words
The process according to claim 4, wherein the fluorovinyl compound is a compound having the formula ##STR3## wherein p is 0 or 1; l is 0 or 1; m is 0 to 1; n is 0 to 8; A represents --COF or --COOR 1 and R 1 represents a lower alkyl group.
Claim 8
Dependent Claim
14 words
The process according to claim 5, wherein the fluorinated ethylenic unsaturated monomer is tetrafluoroethylene.
Claim 9
Dependent Claim
19 words
The process according to claim 1 or 2 wherein said alcohol is a C 1 -C 5 lower alcohol.
Claim 10
Dependent Claim
23 words
The process according to claim 1 wherein the time period for the alcohol treatment is in the range of 1 to 50 hours.
Claim 11
Dependent Claim
28 words
The process according to claim 1 or 2 wherein said alcohol is used in an amount of more than 100 ml. per 100 g. of the fluorinated copolymer.
Claim 12
Dependent Claim
28 words
The process according to claim 3 wherein the acid is incorporated in an amount of 1 to 5 wt. parts per 100 wt. parts of the fluorinated copolymer.
References Cited (Backward Citations)
US4174426A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-02 | 1985-05-04 | 1985-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-02 | 1989-05-04 | 1989-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-02 | 1993-05-04 | 1993-11-03 | $7700.00 | Window Closed / Lapsed |