An image recording medium for an ink jet printer comprises(a) a sheet of
solvent absorbing microporous material which comprises a matrix of
substantially water insoluble thermoplastic organic polymer, finely
divided substantially water insoluble filler particles of which at least
50% by weight are siliceous particles said filler particles being
distributed throughout the matrix and constituting from 40 to 90% by
weight of said micorporous material, there being a network of
interconnecting pores communicating substantially throughout said
microporous material said pores constituting from 35 to 95% by volume of
said microporous material, said sheet of microporous material having (b) a
coating of a polyester. The polyester can be a condensation product
obtained from dicarboxylic acids and glycols and contains sufficient
hydrophilic groups such as sulphonate to make it water dispersible. The
ink jet recording medium can be made by coating a sheet of the microporous
material with an aqueous dispersion of a polyester resin and allowing the
coated sheet to dry.
