The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 11, 2010
Filed:
Aug. 24, 2004
Hiroaki Watanabe, Tokyo, JP;
Katsuaki Arai, Tokyo, JP;
Yasuro Yokota, Tokyo, JP;
Suguru Kashima, Tokyo, JP;
Hiroaki Watanabe, Tokyo, JP;
Katsuaki Arai, Tokyo, JP;
Yasuro Yokota, Tokyo, JP;
Suguru Kashima, Tokyo, JP;
Mitsubishi Paper Mills Limited, Tokyo, JP;
Abstract
The object of the present invention is to provide an ink jet recording material which has no cracks on the surface of the ink-receiving layer and possesses both the color developability and the absorbability of pigment inks. According to the present invention, there is provided an ink jet recording material formed by coating a coating solution of a pigment layer and a coating solution of at least one ink-receiving layer in succession on at least one side of a paper support and drying the resulting coating layers, wherein the pigment contained in the pigment layer has an average secondary particle diameter of not less than 1 μm and not more than 5 μm, 50% by volume or more of the total volume of the pigment has a secondary particle diameter of not less than 1.2 μm and not more than 15 μm, a first ink-receiving layer directly coated on the pigment layer contains at least inorganic ultrafine particles, a hydrophilic binder and boric acid or a borate, and the dry coating amount of the first ink-receiving layer is not less than 20% by mass and not more than 120% by mass of the dry coating amount of the pigment layer.