Nippon Paper Industries Co., Ltd.

Shoichi Endo

Yoshio Yoshida

Yoshihiro Kuroyama

Teiichi Ohtani

Takashi Yamaguchi

Kaoru Hamada

Takayuki Fujimoto

Teruhisa Shimada

Kinya Tamura

Tsuyoshi Yasuda

Jiro Yoshimura

Masaya Tosaka

Yuu Suzuki

Kazuhiro Iwasaki

Masanori Kawashima

Susumu Hagisawa

An inkjet recording medium obtained by forming a coating layer containing a pigment and a binder on the surface of a base material and coating layer is subsequently pressed onto a heated mirror finished surface to dry to form an ink absorbing layer through a cast coating method, wherein pigment contains a colloidal silica that has a primary particle diameter of from 10 nm to 100 nm while the ratio of the secondary particle diameter to primary particle diameter is from 1.5 to 3.0.

Inkjet recording medium

A method of manufacturing an inkjet recording cast-coated paper wherein a coating solution containing a pigment and a binder resin is supplied to a base paper, a treatment solution having the function of solidifying the binder resin is supplied to the coating layer while it is still wet in order to solidify the coating layer, and the wet, solidified coating layer is brought into pressure contact with the mirror surface of a heated drum and dried to obtain a cast-coated layer. According to this invention, the treatment solution is supplied by the double pond method wherein the roll is enclosed by the base paper so as to bring the wet coating layer into contact, and ponds of treatment solution are formed both before and after the coating layer comes into contact with the roll.

Process for producing cast coated paper for ink jet recording

An inkjet recording medium having a recording layer including a pigment and a polyvinyl alcohol on an air-permeable support, wherein inkjet recording medium is made by coating a treatment solution on the recording layer, wherein the treatment solution has the action of solidifying the polyvinyl alcohol in the recording layer when it is in the wet state, and then bringing the recording layer into pressure contact with a heated mirror surface while it is still wet. This treatment solution is a mixed solution of borate/boric acid, wherein the blending ratio of the borate and boric acid in the treatment solution is 0.25/1 to 2/1 by weight ratio.

Ink-jet recording medium

Provided are a recording paper comprising a support paper coated on one side with a recording layer and a method of preparing the same: with the recording layer comprising 60-95 weight % of a pigment and 40-5 weight % of a water base binder and having a thickness of from 3 to 30 .mu.m; wherein the surface roughness by ten point height on the recording layer surface is from 1 .mu.m to 4 .mu.m, the specular glossiness the recording layer surface at 75 degrees according to JIS P8142 is from 70% to 100%, and the part extending to the depth of at least 3 .mu.m below the top surface has a hole distribution curve having at least peak showing an average pore diameter within the range of 0.1 to 1.0 .mu.m and a height ranging from 0.1 to 1.0 ml/g with respect to pore volume when measured with a porosimeter of mercury intrusion type.

Recording paper and method of preparing the same

Disclosed is a transfer paper comprising a support coated on at least one side with a transfer layer having a thickness of not less than 3 .mu.m and at least one constituent layer; with the outermost layer of said transfer layer being a coated layer containing at least a pigment and a binder, and having in the part extending to the depth of at least 3 .mu.m below the surface the hole distribution characterized by having at least one peak which shows the average pore diameter within the range of 0.1 to 1.0 .mu.m and the height ranging from 0.1 to 1.0 ml/g with respect to the pore volume when measured with a porosimeter of mercury injection type.

Transfer paper and method of manufacturing the same

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Tokyo, Japan

Shoichi Endo