Patent ID: 7005163

Claim:
A process for preparing an organic-inorganic hybrid film material, which comprises the steps of: (a) reacting an aromatic diamine with aromatic dianhydride at a temperature of from room temperature to 50° C. to give poly(amic acid), in which an equivalent ratio of the aromatic diamine to the aromatic dianhydride is less than 2; (b) coupling the poly(amic acid) from step (a) with an amino coupling agent having a general formula of NH 2 —R 1 —Si(R 2 ) 3 in which R 1 is a C 1-6 alkylene or phenylene group, R 2 s are the same or different and represent C 1-6 alkoxy group, to give a poly(amic acid) terminated with the amino coupling agent, in which the equivalent of the added coupling agent is less than that of the diamine; (c) subjecting a monomer of formula R 3 —Si(R 4 ) 3 (wherein R 3 represents a hydrogen, C 1-6 alkyl, C 2-6 alkenyl, and phenyl, and R 4 s are the same or different and represent a halogen, C 1-6 alkoxy, C 2-6 alkenyloxy, and phenoxy group) to sol-gel reaction in the presence of acidic catalyst in a solvent at a temperature of from room temperature to 100° C., to give poly(silsesquioxane); wherein the acidic catalyst is added in an amount sufficient to maintain a pH of the reaction mixture at a range from 1 to 4; (d) hydrolyzing the poly(amic acid) terminated with the amino coupling agent from step (b) in the presence of deionized water and then coupling with the poly(silsesquioxane) from step (c), to give a slurry of poly(amic acid)-poly(silsesquioxane) composite material; wherein the amount of deionized water for hydrolyzing the amino coupling agent which is coupled to the poly(amic acid) is molar equivalent to or slight excess the moles of terminal alkoxy group present in the poly(amic acid) terminated with the amino coupling agent; (e) applying the resultant composite material slurry on a substrate, curing the coated slurry at an elevated temperature to produce an organic-inorganic hybrid film material of polyimide/poly(silsesquioxane).