Patent ID: 7070834
Filing Date: 2006-07-04
Classification: B41M

Abstract:
1. A production method of a porous medium comprising a non-water-absorptive support and a porous layer provided on the support, the method comprising: applying Water-based Composition A comprising inorganic microparticles of an average primary particle diameter of less than or equal to 30 nm, a hydrophilic binder and water onto the support to form a layer, drying the layer to form the porous layer, and applying Water-based Composition B onto the dried porous layer, wherein the Water-based Composition A further comprises a compound represented by formula (1) having a molecular weight of less than or equal to 200, wherein R wherein the Water-based Composition B comprises a component which forms coagulants in the Water-based Composition A or increases viscosity of Water-based Composition A, when the component is added in the Water-based Composition A, and the Water-based Composition A does not comprise a component which forms coagulants in the Water-based Composition A or increases viscosity of Water-based Composition A, when the component is added in the Water-based Composition A.