Patent ID: 6750320
Filing Date: 2004-06-15
Classification: B29C,B29K,B29L,Y10T

Abstract:
A process for producing a polyimide platy object, said process comprising:(a) providing a solution containing therein a solvent and a solute that is a polyimide precursor or a polyimide; (b) pouring said solution onto a supporting member; (c) removing a portion of said solvent from said solution by evaporation of said solvent at a first temperature that is lower than a boiling point of said solvent, thereby forming a precursory platy object on said supporting member, said precursory platy object having a self-supporting property, said precursory platy object having a first surface that is in contact with said supporting member and a second surface that is away from said supporting member, said precursory platy object having a first content of said solvent at said first surface and a second content of said solvent at said second surface, said first content being greater than said second content by an amount of 2-10 wt %; (d) detaching said precursory platy object from said supporting member; and (e) heating said precursory platy object at a second temperature that is higher than said boiling point of said solvent and is lower than a decomposition temperature of said polyimide, thereby producing said polyimide platy object.