反应详情

温度

80 °C

First, an ink reception layer exists on a base material of 175 microns. Alumina hydrate was used as the layer material and prepared in the following way. An aluminum octa-oxide was synthesized in accordance with U.S. Pat. No. 4,242,271, and was hydrolyzed to produce an alumina slurry. Water was added to the alumina slurry until the solid component of the alumina hydrate became 5%. After the slurry was heated to 80° C. and subject to maturing reactions for ten hours this colloidal sol was dried by spraying to obtain an alumina hydrate. This alumina hydrate was further mixed and dispersed with an ion exchanged water and was adjusted to have pH 10. A colloidal sol was obtained after a five hour maturing process. After being desalted, this colloidal sol was deflocculated by adding an acetic acid. When the alumina hydrate obtained through drying this colloidal sol was measured by X-ray diffraction, it turned out to be a pseudo boehmite. The colloidal sol of the alumina hydrate was condensed to produce a solution of 15% by weight. Meanwhile, a solution of 10% by weight was obtained by dissolving a polyvinyl alcohol (trade name PVA117, Kuraray Corp.) in an ion exchanged water. Those two kinds of solutions were mixed so that the ratio of the solid portion of the alumina hydrate to the solid portion of the polyvinyl alcohol was ten to one by weight, and were stirred to produce a dispersed fluid. This dispersed fluid was then coated with a dye coater on a polyethyleneterephthalate film, thereby forming a porous layer including pseudo boehmile having a thickness of 40 microns. Subsequently, a vinylchloride-vinyl acetic acid based latex (trade name, Vinybran 602, Nissin Kagaku Kogyo Co. Ltd.) having a solid portion of 15% was coated with a dye coater as a first ink reception layer (topmost layer) and dried at 70° C., thereby forming a porous latex layer (flattened layer) of about 5 microns. Thus, a recording medium having the ink reception layer and the flattened layer was obtained. Two types of the latex, a latex having 0.1 micron or less particles of 20 or more percent and a latex having such particles of ten percent, were prepared. The latex of ten percent was obtained by reducing the particles having particle size of 0.1 micron by filtering the above latex with a precision filtering film (trade name PMV313, official hole diameter 0.25 micron, Asahi Chemical Industry Co.) upon processing under a condition of replacement with a pure water amount of approximately 25 times with respect to the original fluid of the latex.

1. customprepared in the following way
2. customto produce an alumina slurry
3. customfor ten hours
4. customwas dried