Patent ID: 7883756

Claim:
An optical information recording medium comprising a porous film ink receiving layer as an outermost layer of a surface opposite to a recording and playback surface, said porous film ink receiving layer having ink adherence properties such that when the ink receiving layer is printed with an ink of each of four colors, cyan, magenta, yellow, and black, followed by drying, a running water test, in which running water is poured on a printed portion at a rate of about 6 liter/min for 1 minute at 20° C., is performed, and L*a*b* values before and after the running water test are measured with a colorimeter, such that the value obtained from formula (b) as below is about 20 or less, difference ( X ) between before and after running water test=√(( L* b −L* a )×( L* b −L* a )+( a* b −a* a )×( a* b −a* a )+( b* b −b* a )×( b* b −b* a )) (a) Calculation formula= X (Cyan)+ X (Magenta)+ X (Yellow)+ X (Black) (b), said porous film ink receiving layer being a dried single-solution coating film consisting essentially of a gas phase method inorganic powder, a resin binder, a zirconium compound, nitric acid, and lactic acid.