Process for producing fluorinated polymer having ion-exchange groups
First Claim
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1. 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.
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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.
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11 Claims
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1. A process for producing a fluorinated copolymer having ion-exchange groups, comprising:
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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.; anddrying said alcohol treated particles, thereby substantially removing said alcohol from said particles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- 5. The process according to claim 1, wherein the fluorinated ethylenic unsaturated monomer is a fluorinated olefin having the formula
- space="preserve" listing-type="equation">CF.sub.2 ═
CZZ'"'"'
wherein Z and Z'"'"' each represent --F, --Cl, --H or --CF3. - space="preserve" listing-type="equation">CF.sub.2 ═
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6. 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 --COOR1 and R1 represents a lower alkyl group.
- l is 0 or 1;
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7. The process according to claim 5, wherein the fluorinated ethylenic unsaturated monomer is tetrafluoroethylene.
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8. The process according to claim 1 or 2 wherein said alcohol is a C1 -C5 lower alcohol.
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9. The process according to claim 1 wherein the time period for the alcohol treatment is in the range of 1 to 50 hours.
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10. 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.
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11. 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.
Specification