Fluorine-containing resin for preparing paint

摘要

The invention relates to a fluorine-containing resin (graft copolymer) used for preparing a paint. This resin is prepared by a graft copolymerization of a fluorine-containing copolymer with a first monomer composition. The fluorine-containing copolymer comprises a first constitutional unit derived from a fluoroolefin and at least one of second and third constitutional units. The second constitutional unit is derived from a particular carboxylic acid vinyl ester represented by a general formula of R-C(=O)OCH=CH2 where R is a special group. The third constitutional unit is derived from a first monomer which is at least one compound selected from vinyl ethers and allyl ethers. The first monomer is represented by a general formula of R-O-(CH2)n-CH=CH2. The first monomer composition for preparing the resin contains a second monomer which is at least one compound selected from methacrylic acid eaters and acrylic esters. The second monomer is represented by a general formula of CH2=C(-R')C(=O)O-R where R' is hydrogen atom or methyl group. A composition prepared by mixing the resin with vinylidene fluoride resin or with a combination of vinylidene fluoride resin and acrylic resin is capable of providing a coated film having high gloss, high weather resistance, and good results in bending test for a long time. Another composition prepared by mixing the resin with a hardener is capable of providing a coated film having high hardness, good adhesion to various other coated films, high weather resistance, and high stain resistance.