Preparation of transparent methyl-modified silica gel
AssigneeYamamura Glass Co., Ltd.
InventorsZuyi Zhang, Yoshinori Tanigami, Ryohei Terai, Hajimu Wakabayashi
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Abstract
Transparent methyl-modified silica gel is produced by reacting methyltrialkoxysilane or a mixture thereof with a tetraalkoxy-, trialkoxy- or dialkoxysilane other than the methyltrialkoxysilane with a defined quantity of water at a neutral or acidic pH in the presence of a catalytically effective amount of a metal complex soluble in the methyltrialkoxysilane, and aging the resulting hydrolysate sol to form a gel. Self-sustained films of the transparent gel are produced by spreading the hydrolysate sol onto a nonadherent substrate followed by aging or drying. The gel finds use as a host material for doping optically functional molecules.
Claims21
A method for preparing transparent methyl-modified silica gel comprising:
- reacting a reaction mixture comprising methyltrialkoxysilane and optionally up to 80 mole % of the entire mixture of an alkoxysilane selected from the group consisting of a tetraalkoxysilane, a trialkoxysilane other than methyltrialkoxysilane and a dialkoxysilane with water at a H.sub.2 O/Si molar ratio of from 1.4 to 4.0 at a neutral or acidic pH in the presence of a catalytically effective amount of a metal complex soluble in said methyltrialkoxysilane thereby hydrolyzing and polycondensing said methyltrialkoxysilane or said mixture, and aging resulting hydrolyzate sol to form a transparent gel.
A method for preparing a self-sustained film of transparent methyl-modified silica gel comprising:
- reacting methyltrialkoxysilane or a mixture thereof containing up to 80 mole % of the entire mixture of an alkoxysilane selected from the group consisting of a tetraalkoxysilane, a trialkoxysilane other than methyltrialkoxysilane and a dialkoxysilane with water at a H.sub.2 O/Si molar ratio of from 1.4 to 4.0 at a neutral or acidic pH in the presenc of a catalytically effective amount of a metal complex soluble in said methyltrialkoxysilane to hydrolyze and polycondensate said methyltrialkoxysilane or said mixture, spreading the resulting hydrolysate sol on a nonadherent substrate to form a film, drying the film, stripping off the dried film from said substrate, and heat treating the film in the atmosphere of a gaseous base at a temperature up to 500.degree. C.
Dependencies are inferred from the claim text.