METHOD FOR PRODUCING CARBONACEOUS FILM AND METHOD FOR PRODUCING GRAPHITE FILM

摘要

Disclosed herein is a method for producing a roll-shaped carbonaceous film by polymer pyrolysis while suppressing the occurrence of fusion bonding in the roll-shaped carbonaceous film. The carbonaceous film production method includes the step of heat-treating a polymer film wound into a roll, wherein, at a temperature equal to or higher than the pyrolysis onset temperature of the polymer film but equal to or lower than a temperature at which the weight of the polymer film is reduced by 40% as compared to that before heat treatment, the roll-shaped polymer film has (2-1) a gap between layers of the polymer film so that a value determined for the whole roll-shaped polymer film by dividing the thickness of the gap between adjacent layers of the polymer film (Ts) by the thickness of the polymer film (Tf) (Ts/Tf) satisfies a relationship of 0.33≦Ts/Tf≦1.50 and/or (2-2) a space inside a 50% cross-sectional circle of the roll-shaped polymer film so that the area of the space inside the 50% cross-sectional circle is 25% or more of the cross-sectional area of the 50% cross-sectional circle.

主权项

1. A method for producing a carbonaceous film, comprising the step of heat-treating a polymer film wound into a roll, wherein:
(1) at a temperature lower than a pyrolysis onset temperature of the polymer film, (1-1) a value determined for the whole roll-shaped polymer film by dividing a thickness of a gap between adjacent layers of the polymer film (Ts) by a thickness of the polymer film (Tf) (Ts/Tf) satisfies a relationship of Ts/Tf<0.33 or Ts/Tf>1.50 and (1-2) an area of a space inside a cross-sectional circle of the roll-shaped polymer film having a circumference whose center is located at a center of the roll-shaped polymer film and on which a point, at which a film length from an inner end of the roll-shaped polymer film is 50% of a total length of the polymer film, is located (the cross-sectional circle and the space are also referred to as the “50% cross-sectional circle” and the “space inside the 50% cross-sectional circle”, respectively) is less than 25% of a cross-sectional area of the 50% cross-sectional circle, and (2) at a temperature equal to or higher than a pyrolysis onset temperature of the polymer film but equal to or lower than a temperature at which a weight of the polymer film is reduced by 40% as compared to that before start of heat treatment, the roll-shaped polymer film has (2-1) a gap between layers of the polymer film so that a value determined for the whole roll-shaped polymer film by dividing a thickness of the gap between adjacent layers of the polymer film (Ts) by a thickness of the polymer film (Tf) (Ts/Tf) satisfies a relationship of 0.33≦Ts/Tf≦1.50 and/or (2-2) a space inside a cross-sectional circle of the roll-shaped polymer film having a circumference whose center is located at a center of the roll-shaped polymer film and on which a point, at which a film length from an inner end of the roll-shaped polymer film is 50% of a total length of the polymer film, is located (the cross-sectional circle and the space are also referred to as the “50% cross-sectional circle” and the “space inside the 50% cross-sectional circle”, respectively) so that an area of the space inside the 50% cross-sectional circle is 25% or more of a cross-sectional area of the 50% cross-sectional circle.