PURPOSE: To improve weatherability, durability, and acid rain resistance, and prevent water droplets from adhering to the inner surface, and further maintain the strength and light transmittance for a long period by laminating a fluorine- containing copolymeric film having a hydrophilic property on a fluororesin film.
CONSTITUTION: This film is composed of laminating a fluorine-containing copolymeric film having a hydrophilic property on a fluororesin film. Herein, the fluorine-containing copolymeric film having a hydrophilic property is a copolymer of ethylene-tetrafluoroethylene-hydrophilic group-containing vinyl monomer. The fluorine-containing copolymer is preferable to be 40/60-80/20 in a mole ratio of ethylene polymeric unit/tetrafluoroethylene polymeric unit, and to be 5-30mol.%. In the content of coplymeric unit of a hydrophilic group- containing vinylmonomer. The hydrophilic group-containing vinylmonomer is expressed by CH2=CH-(O)m-(CF2)n-X as an example.
FUNAKI ATSUSHI
MIYAKE HARUHISA
