To provide a fluororesin-containing gradient film exhibiting functions as a fluororesin-containing heat-resistant resin film, which compatibly achieves various characteristics at high levels such as surface smoothness (resulting in slidability and wear resistance), mold releasability and heat resistance by virtue of an excellent composite form of a fluororesin and another resin (base resin); a preferable method for producing such a gradient film; and a resin composition for forming the fluororesin-containing gradient film to be a raw material for forming the gradient film.
This fluororesin-containing gradient film contains a base resin and a fluororesin. In the fluororesin-containing gradient film, the content ratio of the fluororesin in one side surface part of the film is more than that of the base resin, the abundance ratio of the fluororesin to the whole resin combining the base resin and the fluororesin decreases toward the depth direction from the one side surface of the film, and the abundance ratio of the fluororesin to the whole resin in a depth more than 1 μm from the one side surface of the film is more than the abundance ratio of the fluororesin to the whole resin in the whole film.
MASUDA TAKESHI
TAJIRI KOZO
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