Water-repellent porous silica, method for preparation thereof and use thereof
AssigneeMitsui Chemicals, Inc.
InventorsKazuo Kohmura, Akihiro Okabe, Takeshi Kubota, Yoshito Kurano, Masami Murakami
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Abstract
Water-repellent porous silica having uniform pores, which comprises silica skeleton wherein fluorine atoms are fixed through covalent bonds and which has an alkali metal content of not more than 10 ppb, is synthesized. By the water-repellent porous silica, a water-repellent porous silica film having uniform pores, which is applicable to a light functional material or an electron functional material, a process for preparing the same and uses thereof can be provided.
Claims20
Water-repellent porous silica having uniform pores, which contains fluorine atoms fixed in the silica skeleton through covalent bonds and has an alkali metal content of not more than 10 ppb.
A precursor solution for forming water-repellent porous silica, which is obtained by partially hydrolyzing a fluorine-containing trialkoxysilane represented by the following formula and a tetraalkoxysilane under acidic condition and then mixing the resulting hydrolysis solution with a surface active agent;
- (ZO)3SiR
- wherein Z is methyl, ethyl, n-propyl, i-propyl, n-butyl, t-butyl, i-butyl or sec-butyl, and R is a fluorine atom, (CH2)a(CF2)b(O(CF2)c)dX (X is a fluorine atom, OCF3, OCF(CF3)2, OC(CF3)3, an alkyl group or a phenyl group, a is a number of 0 to 3, b is a number of 0 to 3, c is a number of 1 to 3, and d is a number of 0 to 3) or C6HeF(5−e) (e is a number of 0 to 4).
Dependencies are inferred from the claim text.