Ink jet printing paper has an ink-receiving coating containing a water-soluble binder and a special aluminosilicate polymer obtained by hydrolysis of aluminum and silicon compounds with alkali in presence of silanol groups

摘要

An ink-receiving layer for ink-jet printing material comprises, in addition to a water-soluble binder, a special aluminosilicate polymer made by hydrolysis of aluminum and silicon compounds with aqueous alkali in presence of silanol groups, followed by the addition of excess chelating agent. Ink jet printing material (I) comprising a support (A) and ink-receiving layer(s) (B), in which (B) comprises (B1) water-soluble binder(s) and (B2) aluminosilicate polymer(s) obtained from mixed aluminum-silicon alkoxides with only hydrolysable groups, or a mixed precursor made by hydrolysis of a mixture of Al and Si compounds with only hydrolysable groups, by (a) treatment with aqueous alkali in presence of silanol groups, keeping the Al concentration below 0.3 mol/l, the Al/Si mol ratio between 1 and 3.6 and the alkali/Al mol ratio between 2.3 and 3, (b) stirring at room temperature in presence of silanol groups for the time required to form the aluminosilicate polymer, (c) removing by-products and (d) adding a chelating agent (CA) in a mol ratio of (chelating functions):Al = 1 or more.