Patent ID: 8039057
Filing Date: 2011-10-18
Classification: C08J,G03G,Y10T

Abstract:
1. A method for producing a polyimide film, comprising steps of: forming a polyimide compound having a polyimide as the primary constituent and containing at least a polymeric conductive agent into a film shape; exposing to high temperature and humidity the film-shaped polyimide compound formed in the step of forming the polyimide compound wherein the polyimide compound is kept in an environment of a temperature of 27° C. or more and a humidity of 70% or more; exposing to normal temperature and humidity the film-shaped polyimide compound after being exposed to the environment of the temperature of 27° C. or more and the humidity of 70% or more in the step of exposing to high temperature and humidity, wherein the polyimide compound is kept in an environment of a temperature lower than 27° C. and a humidity lower than 70%, cutting into a long belt the film-shaped polyimide compound after the step of exposing to normal temperature and humidity; stamping each of both ends of the long belt in a puzzle-cut pattern having a plurality of protuberances, each of which protrudes in a longitudinal direction of the long belt and which are positioned along a width direction of the long belt that is across the longitudinal direction, and a plurality of dents which are positioned between the plurality of protuberances respectively along the width direction, wherein the puzzle-cut patterns of the both ends are patterns in which the plurality of protuberances of one end of the both ends engage with the plurality of dents of other end of the both ends respectively in such a manner that the both ends are kept from separating from each other in the longitudinal direction; and connecting the both ends of the long belt, which is in a state that the plurality of protuberances of the one end of the both ends engage with the plurality of dents of the other end of the both ends respectively, with a predetermined adhesive member.