Coating fluid for the preparation of a recording medium for use in inkjet printing

摘要

A coating fluid for forming a coating on a support for use in printing comprises an aqueous liquid having dispersed therein (a) from 2 to 50% of an inorganic oxide selected from aluminium oxide and silica the % being by weight based on the combined weight of aqueous liquid and inorganic oxide and (b) from 1 to 50 % by weight based on the weight of oxide (a) of a composition comprising a polymer containing negatively charged groups and a cationic surfactant. The composition may be formed from a polymer containing maleic acid units and a surfactant containing a quaternary nitrogen atom. The polymer may be a copolymer obtained by copolymerising a maleic acid containing monomer with another ethylenically unsaturated monomer or monomers and where the molar ratio of maleic acid containing monomers to other monomers is from 1:1 to 1:5.