Patent ID: 7132473

Claim:
A composition for forming porous film, the composition consisting essentially of siloxane polymer and one or more quaternary ammonium salts represented by following formula (1) or (2): [(R 1 ) 4 N]+[R 2 X] − (1) H k [(R 1 ) 4 N] m + Y n− (2) wherein R 1 independently represents a straight chain or branched alkyl or aryl group having 1 to 10 carbons which may have a substituent and R 1 s may be same or different; R 2 represents a hydrogen atom or an straight chain or branched alkyl or aryl group having 1 to 10 carbons which may have a substituent; X represents CO 2 , OSO 3 , or SO 3 ; Y represents SO 4 , SO 3 , CO 3 , O 2 C—CO 2 , NO 3 , or NO 2 ; and k is 0 or 1, m is 1 or 2 and n is 1 or 2 in proviso that n=1 requires k=0 and m=1, and n=2 requires k=0 and m=2, or k=1 and m=1, and wherein the one or more quaternary ammonium salts are present in an amount of 0.001 to 10 parts by weight per one part by weight of the siloxane polymer.