Patent ID: 8192819
Filing Date: 2012-06-05
Classification: B41M,G11B,Y10T

Abstract:
1. A disc-shaped information recording medium comprising an optical penetrating substrate having a colored underlayer and an ink receipt layer in this order on the principal surface of one side of the substrate, wherein the ink receipt layer contains an inorganic fine particle, a binder, and a crosslinking agent, and wherein a pore diameter distribution of gaps in the ink receipt layer have a maximum peak in the range of 30 nm or more when the ink receipt layer is measured with a mercury porosimetry method, said ink receipt layer comprising a salt or pH adjustor as a coagulant for coagulating particles constituting the inorganic fine particle, said salt or pH adjuster being selected from the group consisting of NaCl, magnesium sulfate, sodium nitrate, lithium chloride, sodium citrate, magnesium sulfate, nitric acid, sulfuric acid, hydrochloric acid, acetic acid, lactic acid, sodium hydroxide, potassium hydroxide, sodium carbonate, and ammonia aqueous solution.