Coated paper for printing - Patents

Coated paper for printing
Patent Agent: Michael J. Striker - Huntington, NY, US
Patent Inventors: Takayuki Kishida, Yoshiki Kojima, Nobuo Yamada, Yasuhiro Arai, Tetsuya Hirabayashi
Applicaton #: 20070048508
Class: 428211100 (USPTO)
Related Patents: Stock Material Or Miscellaneous Articles, Structurally Defined Web Or Sheet (e.g., Overall Dimension, Etc.), Discontinuous Or Differential Coating, Impregnation Or Bond (e.g., Artwork, Printing, Retouched Photograph, Etc.), Including Paper Layer
03/01/07

A coated paper is white and glossy enough to give satisfaction as a printing paper, exhibits a good printability in offset sheet-fed printing and a high printing gloss, and does not degrade the print efficiency. The coated paper is characterized by having two or more coating layers composed mainly of a pigment and an adhesive on at least one side of a base paper. When ink is transferred onto the paper, the ink settability is relatively low in the early stage of the drying process and relatively high in the final stage.

SUMMARY OF THE INVENTION
[0021] According to one aspect of the invention, there is provided a coated paper for printing applying two or more coating layers composed mainly of a pigment and an adhesive on at least one surface of a base paper, wherein absorption coefficient Ka of the coating layers is within a range of 0.02-0.35 ml/(m.sup.2ms.sup.1/2) when measured using Bristow tester and standard viscosity oil (JS2.5) defined in JIS Z8809-1992 as evaluation liquid, wherein ink is prepared by blending sheet ink for evaluating paper of 80 mass % and ink solvent of 20 mass % so as to print on the coating layers on condition that printing pressure is 100N and the amount of transferred ink is 2.3.+-.0.1 g/m.sup.2, wherein the maximum value of ink tack can be measured between 24.5 seconds and 790.2 seconds after printing has been performed, wherein an ink tack value measured 24.5 seconds after printing has been performed is 3N or less and ink tack an value measured 790.2 seconds after printing has been performed is 4N or less.
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