Patent ID: 6500490
Filing Date: 2002-12-31
Classification: B01J,C23C,F28F

Abstract:
A method for making a hydrophilic composition and for coating a substrate with said composition comprising steps of:preparing a synthesis solution which comprises tetrapropylammonium hydroxide, sodium hydroxide, aluminum oxide, tetraethylorthosilicate, and water in molar ratios of about 76-265:520-680:0-2.4:1,000:69, 100-95, 100, respectively, for forming, on a substrate, a zeolite composition having a formula selected from the group consisting of (a) Mn/m[AlnSi(96âˆ’n)O192], wherein M is a biocidal metal ion of valence m+ and 27>n>=0 and of (b) [AlnSi(96âˆ’n)O192]Â·4[(CH3CH2CH2)4Nâ€”OH] wherein 27 >n>=0; placing said substrate in contact with said synthesis solution; and while said substrate and said solution are in contact, forming a polycrystalline zeolite layer on said substrate to obtain an article coated with a zeolite composition layer having said formula.