Material for fluorine-containing coating composition and method for coating by using same

A method for coating a surface of a substrate with a fluorine-containing polymer, which comprises:

• forming, on a substrate, a layer of a fluorine-containing coating composition which comprises a fluorine-containing ethylenic polymer having functional group and prepared by copolymerizing the following fluorine-containing ethylenic monomers (a-1) and (b-1):
• (a-1) 0.05 to 30% by mole of at least one of fluorine- containing ethylenic monomers having any one of functional groups selected from the group consisting of carboxyl, carboxylate salt group, carboxylate ester group and epoxy and;
• (b-1) 70 to 99.95% by mole of at least one of the fluorine- containing ethylenic monomers which do not have the functional group mentioned above and which is selected from the group consisting of tetrafluoroethylene, chlorotrifluoroethylene, vinylidene fluoride, perfluoro(alkyl vinyl ether), hexafluoroisobutene, CH2=CF- (CF2)n-X and CH2=CH2-(CF2)n-X, wherein both X are independently selected from H, Cl and F and both of n are independently an integer of 1 to 5.

A material for fluorine-containing coating composition which comprises a fluorine-containing polymer having functional group and prepared by copolymerizing the following fluorine-containing ethylenic monomers (a-1) and (b-1):

• (a-1) 0.05 to 30% by mole of at least one of fluorine- containing ethylenic monomers having any one of functional groups selected from the group consisting of carboxyl, carboxylate salt group, carboxylate ester group and epoxy and;
• (b-1) 70 to 99.95% by mole of at least one of the fluorine- containing ethylenic monomers which do not have the functional group mentioned above and which is selected from the group consisting of tetrafluoroethylene, chlorotrifluoroethylene, vinylidene fluoride, perfluoro(alkyl vinyl ether), hexafluoroisobutene, CH2=CF-(CF2)n-X and CH2=CH2-(CF2)n-X, wherein both X are independently selected from H, Cl and F and both of n are independently an integer of 1 to 5, and wherein the material is one of materials selected from the group consisting of a material which is in the form of a solution in a solvent and is used for fluorine-containing coating composition, a material which is in the form of dispersion in water and is used for an aqueous dispersion for fluorine-containing coating composition and a material which is in the form of a powder and is used for a fluorine-containing powder coating composition.