Abstract: A fluoropolymer film or powder is brought into contact with a carboxylic acid and their surface is irradiated with ultraviolet light so that alkyl and other organic radicals derived from the carboxylic acid are introduced into the irradiated part, thereby imparting chemical affinity such as oleophilicity to the film or powder surface.

Abstract: The invention provides surface-modified hydrophilic fluororesin moldings. The surface of a fluororesin molding is at least partly hydrophilized by irradiating at least part of the fluororesin molding with ultraviolet laser light not longer than 400 nm in wavelength in a state such that the molding is in contact with gas-treated water prepared by introducing into water a gas such as hydrogen gas, nitrogen gas or a rare gas or with some other specific aqueous liquid. The thus-obtained fluororesin moldings are suited for use, for example, as materials of artificial blood vessels excellent in antithrombotic property, and contact lenses free of modification-due discoloration. Further, they are expected to find a wider range of application where their performance characteristics are to be utilized.

Abstract: A process for modifying surfaces of fluorine resins including irradiating an ultraviolet laser beam on the surfaces in the presence of an inorganic silicon compound. The inorganic silicon compound could be a silicate, silicon oxide, silicon nitride, or silicon carbide.