US4341685A
Expired / Lapsed
US
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Process for preparing organic dispersion of acid type fluorinated polymer
Assignee: AGC Inc
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Filing: 1980-11-03
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Granted: 1982-07-27
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Expires: 2000-11-03
Abstract
Abstract An organic dispersion is prepared of an acid type fluorinated polymer comprises copolymerizing a fluorinated ethylenically unsaturated monomer and a functional monomer having an acid type functional group in an aqueous medium under an action of a polymerization initiator source to obtain an aqueous dispersion of an acid type fluorinated polymer having the functional monomer unit content of 5 to 40 mol %; and replacing an aqueous medium of the aqueous dispersion to a hydrophilic organic medium under maintaining the dispersion.
Inventors
- 👤 Haruhisa Miyake
- 👤 Yoshio Sugaya
- 👤 Tatsuro Asawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:00
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/09; C08J5/00; C08J5/20; C08J5/22; C08J5/2206; C08J5/2218; C08J5/2231; C08J5/2243; C08J5/225; C08J2327/00; C08J2327/02; C08J2327/12
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
116 words
A process for preparing a dispersion of a fluorinated copolymer containing acid groups or groups convertible to acid groups in an organic solvent, consisting essentially of: copolymerizing a fluorinated ethylenically unsaturated monomer and a monomer containing an acid group or group convertible into an acid group in an aqueous medium containing a polymerization initiator thereby obtaining an aqueous dispersion of a fluorinated copolymer having an acid group or a group convertible to an acid group content of 5 to 40 mole %; and substituting the aqueous medium of said dispersion with a hydrophilic organic solvent while maintaining the dispersion of said copolymer, whereby a concentration of copolymer exceeding 5% by wt in said dispersion is obtained.
Claim 2
Dependent Claim
116 words
A process for preparing a dispersion of a fluorinated copolymer containing acid groups or groups convertible to acid groups in an organic solvent, consisting essentially of: copolymerizing a fluorinated ethylenically unsaturated monomer and a monomer containing an acid group or group convertible into an acid group in an aqueous medium containing a polymerization initiator thereby obtaining an aqueous dispersion of a fluorinated copolymer having an acid group or a group convertible to an acid group content of 5 to 40 mole %; and substituting the aqueous medium of said dispersion with a hydrophilic organic solvent while maintaining the dispersion of said copolymer, whereby a concentration of copolymer exceeding 5% by wt in said dispersion is obtained.
Claim 3
Dependent Claim
116 words
The process according to claim 1 wherein said 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 represents --F or --CF 3 ; Y' represents --F or a C 1-10 perfluoroalkyl group; A represents ##STR8## R 1 represents a C 1-10 alkyl group; R 2 and R 3 respectively represent --H or R 1 ; R 4 represents R 1 ; M represents an alkali metal atom or a quaternary ammonium group.
Claim 4
Dependent Claim
35 words
The process according to claim 1 wherein said fluorinated ethylenically unsaturated monomer is a fluorinated olefin having the formula CF 2 ═CZZ' wherein Z and Z' each represent --F, --Cl, --H or --CF 3 .
Claim 5
Dependent Claim
47 words
The process according to claim 2 wherein said functional mononer is a fluorovinyl compound having the formula ##STR9## wherein q is 0 or 1; r is 0 or 1; s is an integer of 0 to 8; and B represents ##STR10## R represents a lower alkyl group.
Claim 6
Dependent Claim
14 words
The process according to claim 3 wherein said fluorinated ethylenically unsaturated monomer is tetrafluoroethylene.
Claim 7
Dependent Claim
16 words
The process according to claim 1 wherein said copolymerization is conducted at 20° to 90° C.
Claim 8
Dependent Claim
20 words
The process according to claim 1 wherein said copolymerization is conducted under a pressure greater than 7 kg/cm 2 .
Claim 9
Dependent Claim
28 words
The process according to claim 1 wherein said hydrophilic organic solvent is selected from the group consisting of alcohols, ketones, organic acids, aldehydes, amines, pyrrolidones, esters and ethers.
Claim 10
Dependent Claim
32 words
The process according to claim 1, wherein said copolymerization is conducted under conditions in which the concentration of said fluorinated copolymer is kept less than 40 weight % in the aqueous dispersion.
Claim 11
Dependent Claim
22 words
The process according to claim 1, wherein said dispersion based on said hydrophilic organic solvent contains up to 30 weight % water.
Claim 12
Dependent Claim
62 words
The process of claim 1, which further comprises forming said organic solvent based dispersion by removing a portion of the water from said aqueous dispersion; adding said hydrophilic organic solvent to said aqueous dispersion from which water has been removed; removing a portion of the liquid medium from said organic solvent containing dispersion; and then adding additional organic solvent to said dispersion.
References Cited (Backward Citations)
US3075939A
Cited
JPS53159984U
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-07-26 | 1986-01-25 | 1986-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-26 | 1990-01-25 | 1990-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-26 | 1994-01-25 | 1994-07-27 | $7700.00 | Window Closed / Lapsed |