Patent ID: 6350844
Filing Date: 2002-02-26
Classification: B32B,C08G,C09J,G11B,H05K,Y10T

Abstract:
A polyimide film having a tensile elastic modulus of 700 kg/mm2 or less and a coefficient of linear expansion at 100 to 200Â° C. of 5 to 15 ppm which contains three repeating units A, B and C in its molecule, whereinsaid repeating unit A is represented by the following general formula (A): wherein R1 represents a divalent organic group selected from among: (wherein R4 represents CH3â€”, Clâ€”, Brâ€”, Fâ€”or  CH3Oâ€”); and R represents a divalent organic group represented by the following general formula: (wherein n is an integer of 1 to 3; and X represents a monovalent substituent selected from among a hydrogen atom, a halogen atom, a carboxyl group, a lower alkyl group having 6 or less carbon atoms and a lower alkoxy group having 6 or less carbon atoms),said repeating unit B is represented by the following general formula (B): wherein R1 is as defined in the general formula (A), and R represents a divalent organic group represented by the following general formula: (wherein Y and Z may be the same or different and each represents a monovalent substituent selected from among a hydrogen atom, a carboxyl group, a lower alkyl group having 6 or less carbon atoms and a lower alkoxy group having 6 or less carbon atoms; and A represents a divalent linking group selected from among â€”Oâ€”, â€”Sâ€”, â€”COâ€”, â€”SOâ€”, SO2â€”, and CH2â€”),said repeating unit C is represented by the following general formula (C): wherein R is defined as in any one of the general formulae (A) and (B); and R3 represents a tetravalent organic group selected from among: and the ratio of repeating units A+B to repeating units C is from 1:3 to 3:1.