Patent ID: 7855256

Claim:
A method of preparing an adhesive composition comprising the steps of: (i) mixing (A) a linear polyfluoro compound having at least two alkenyl groups per molecule and a perfluoropolyether residue in a main chain of the linear polyfluoro compound (A); 20 to 60 parts by weight, per 100 parts by weight of component (A), of (D) hydrophobic silica powder; and 0.5 to 15 parts by weight, per 100 parts by weight of component (D), of an alkoxysilane represented by the following formula (1) (RO) 3 —Si-T (1) wherein R may be the same as or different from each other and is a monovalent hydrocarbon group, T is a group represented by the formula, —OR 1 or —CHR 2 —COOR 3 , wherein R 1 is a monovalent hydrocarbon group, which may be the same as or different from R, R 2 is a hydrogen atom or a methyl group and R 3 is a monovalent hydrocarbon group; (ii) kneading the mixture obtained in step (i) and then adding component (A) to make a content of component (D) of from 0.5 to 30 parts by weight, per 100 parts by weight of component (A); and (iii) adding to the mixture obtained in step (ii) the following components (B), (C), and (F): (B) an organohydrogensiloxane having a fluorinated group and at least two SiH bonds per molecule in such an amount that a molar amount of the SiH bond is 0.5 to 3.0 times that of the alkenyl group contained in the component (A); (C) 0.1 to 500 ppm of a compound of a platinum group metal in an amount of, calculated as platinum group metal, based on 100 parts by weight of the component (A); and 0.1 to 10 parts by weight of (F) an organosiloxane having at least one SiH bond and at least one group selected from the group consisting of an epoxy group and a trialkoxysilyl group, said at least one group being bonded to a silicon atom of the organosiloxane (F) via an organic group which may contain an oxygen atom.