Patent ID: 7790828

Claim:
A process for preparing a precursor solution for polyimide/silica composite material, comprising: (A) providing a poly(amic acid) solution; (B) adding an amino coupling agent having formula H 2 N—R 1 —Si(R 2 ) 3 (in which R 1 is a C 1-6 -alkylene or an arylene, and R 2 may be the same or different, each representing a C 1-6 -alkoxy) to the solution of step (A); (C) adding a monomer of a silane compound to the solution obtained from step (B) to allow the poly(amic acid) to carry a silica moiety; (D) adding a monomer of formula (R 6 ) x Si(R 7 ) (4−x) (in which R 6 is a photo-polymerizable unsaturated group ended group, R 7 is halogen, C 1-6 -alkoxy, C 2-6 -alkenoxy or aryloxy, and x is an integer of 1 to 3) to the solution obtained from step (C) to allow the silica moiety to carry a photo-polymerizable unsaturated group; and (E) adding a monomer of formula R 8 N(R 9 ) 2 (in which R 8 is a photo-polymerizable unsaturated group ended group and R 9 is a C 1-6 -alkyl) to the solution obtained from step (D) to allow the poly(amic acid) to carry a photo-polymerizable unsaturated group to produce a precursor solution for a photo-polymerizable polyimide/silica composite material.