Silica-alumina composite sol, processes for produc

专利名称：Silica-alumina composite sol, processes for

producing the same, and recording medium

发明人：Katsumasa Nakahara,Noriko

Torimoto,Hachiro Hirano,ToshiyaMatsubara,Shinichi Suzuki,HisaoInokuma,Hirokazu Wakabayashi

申请号：US09463965申请日：20000211公开号：US06623820B1公开日：20030923

摘要：It is an object of the present invention to obtain a composite sol capable offorming an ink-receiving layer having a high transparency and a high property for fixingdyes. The present invention provides a sol which is a colloidal solution having aggregateparticles containing silica and alumina dispersed in an aqueous medium, wherein the silicais such that the primary particles are spherical and the average particle size of theprimary particles is from 2 to 200 nm, the average particle size of the aggregate particlesis at least twice the average particle size of the silica primary particles and at most 1,000nm, the &zgr;-potential of the aggregate particles is at least +10 mV, and the pH of thesolution is from 3 to 9. The present invention provides a method for producing a silica-alumina composite sol, which comprises gradually adding an aluminum salt of which theliquid exhibits acidity when dissolved in water, to a silica sol, and a method for producing asilica-alumina composite sol, which comprises mixing a silica sol with an alumina sol havinga specific surface area of a xerogel obtainable by drying of at least 150 m/g, to form

aggregate particles containing silica and alumina, followed by peptization treatment.

申请人：ASAHI GLASS COMPANY LTD.

代理机构：Oblon, Spivak, McClelland, Maier & Neustadt, P.C.

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