Fluorine-containing resin composition and method for producing the same

Abstract

The present invention provides a fluororesin composition that can be used as a paint. [Solution] A fluorine-containing resin composition comprising 95% by mass or more of a fluorine-containing copolymer (A) containing monomers having functional groups as constituent units, and 100 to 3000 ppm of water (B) as constituent components.

Claims

1. A fluorine-containing copolymer (A) containing monomers having functional groups as constituent units, 95% by mass or more, Water (B) 100-3000ppm A fluororesin composition characterized by containing as a constituent component.

2. The fluororesin composition according to claim 1, further containing 0.1 to 2% by mass of an organic solvent (C).

3. The fluorine-containing polymer (A) contains monomers having hydroxyl groups as constituent units, and the hydroxyl value of the fluorine-containing polymer is 45 mg KOH / g or more, according to claim 1 or 2.

4. The fluorine-containing resin composition according to claim 1 or 2, wherein the fluorine-containing copolymer (A) comprises a fluoroolefin unit and at least one monomer unit selected from the group consisting of vinyl esters, vinyl ethers, (meth)acrylic esters, and allyl ethers.

5. The fluorine-containing polymer (A) contains monomers having an acid value as constituent units, and the acid value of the fluorine-containing polymer (A) is 1.0 mg KOH / g or more, according to claim 1 or 2.

6. The fluorine-containing polymer (A) is a fluorine-containing resin composition according to claim 1 or 2, wherein the weight-average molecular weight (Mw) on a polystyrene basis, as measured by GPC, is 50,000 or less.

7. The fluorine-containing polymer (A) is soluble in parachlorobenzotrifluoride, and the rotational viscosity at 25°C measured with a B-type viscometer when dissolved in parachlorobenzotrifluoride to a solid content concentration of 50% by mass is 10,000 mPa·s or less, according to claim 1 or 2 of the fluorine-containing resin composition.

8. The fluororesin composition according to claim 1 or 2, wherein the organic solvent (C) comprises at least one selected from the group consisting of n-butyl acetate, ethyl acetate, xylene, toluene, methyl ethyl ketone, methyl isobutyl ketone, acetone, and alcohols having 4 or fewer carbon atoms.

9. The fluororesin composition according to claim 1 or 2, which is in flake, powder, or pellet form at a temperature of 25°C.

10. The fluororesin composition according to claim 1 or 2, wherein the pellet shape is pellet-shaped, and the average major diameter of the pellet is 20 mm or less, and the average aspect ratio is 2 or less.

11. The fluorine-containing copolymer (A) is contained in a content of 99.0 to 99.9% by mass. The aforementioned water (B) is contained in a concentration of 100 to 3000 ppm. It contains an organic solvent (C) at a content of 0.1 to 1.0% by mass. The fluorine-containing copolymer (A) is Fluoroolefin units and At least one monomer unit selected from the group consisting of vinyl monomers having hydroxyl groups and vinyl monomers having carboxyl groups, A fluororesin composition according to claim 1 or 2, comprising at least one monomer unit selected from the group consisting of alkyl vinyl esters and alkyl vinyl ethers.

12. A method for producing a fluororesin composition according to claim 1 or 2, characterized by comprising the step of desolventing a fluororesin solution obtained by dissolving the fluororesin in an organic solvent (C) at a heat transfer medium temperature of 150°C or lower until the organic solvent (C) is reduced to 2% by mass or less, and then removing water so that the water content is 100 to 3000 ppm.

Images