Coated paper for printing
AssigneeOji Paper Co., Ltd.
InventorsTakayuki Kishida, Yoshiki Kojima, Nobuo Yamada, Yasuhiro Arai, Tetsuya Hirabayashi
Life of this patent
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Abstract
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.
Claims8
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 pigment components of the outermost layer is composed of calcium carbonate of 5-70 mass % having an average particle diameter of 0.3-1.2 μm and kaolin of 30-95 mass % having an average particle diameter of 0.1-0.4 μm, and adhesive components of the outermost layer is composed of (a) water soluble adhesive, (b) styrene-butadiene copolymer latex containing acrylonitrile of 10-35 mass % in the ratio of monomer and having an average diameter of 50-120 nm, and (c) copolymer latex and other than the above (b), wherein when an amount of each fo the above (a), (b), and (c) contained in the coating layer is denoted as (S) mass parts, (LI) mass parts, and (L2) mass parts based on 100 mass parts of pigment components of the coating layer, respectively, the value of A can be obtained by the following equation:
- A(mass part)=2×(S)+1.5×(L1)+1×(L2)
- Wherein, 0≦(S)<6, 0≦(L1), 0≦(L2),
- (S)+(L1)+(L2)≦16
- Wherein the amount of pigment components having an average particle diameter of 0.4 μm or less contained in the outermost layer is
- (i) 60 mass% or less of the total amount of pigment components, the value of A is within a range of 16-21,
- (II) more than 60 mass % of the total amount of pigment components, the value of A is within a range of 19-24,
- wherein 80-100 mass% of pigment components of an inner coating layer abutting on the outermost coating layer is composed of calcium carbonate having an average particle diameter of 0.1-1.2 μm while the mixture amount of adhesive components of the coating layer is 6-13 mass parts based on 100 mass parts of pigment components and the amount of water soluble adhesive contained in adhesive components is less than 6 mass parts based on 100 mass parts of pigment components.
Dependencies are inferred from the claim text.