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Coating solution and coated paper coated with the same

A technology of coating liquid and coated paper, which is applied in the field of coated paper and can solve problems such as not knowing

Inactive Publication Date: 2009-09-23
OKUTAMA IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, a coating liquid for coated paper containing only calcium carbonate without using kaolin has not been known so far.

Method used

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  • Coating solution and coated paper coated with the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 40 parts by mass of the aragonite columnar light calcium carbonate dispersion slurry prepared in the reference example was mixed with a commercially available wet heavy calcium carbonate slurry (“Kabital 90” manufactured by Immigration Corporation, with an average particle size of 1.2 μm) 60 parts by mass were mixed and stirred to obtain a pigment mixed slurry.

[0043] In this slurry, 3 parts by mass of urea phosphorylated starch (manufactured by Nippon Food & Chemical Corporation) and 10 parts by mass of styrene-butadiene latex (manufactured by Nippon Gosei Co., Ltd.) were blended as a pigment binder as a powder anti-powder agent. 1 part by mass of calcium stearate (manufactured by Sunnapko Co., Ltd.) was adjusted to pH 10 using sodium hydroxide (manufactured by Wako Pure Chemical Industries, Ltd.) to obtain a coating liquid with a solid concentration of 63%.

[0044] Use wire rod for coating to press 8g / m per side 2 After the coating liquid prepared in this way is manual...

Embodiment 2

[0046] Except that 60 parts by mass of the light calcium carbonate dispersion slurry prepared in the Reference Example and 40 parts by mass of the wet heavy calcium carbonate were used as the raw material of the pigment mixing slurry, a coating liquid and a coated paper were prepared in the same manner as in Example 1. Table 1 shows the physical properties of the coated paper.

Embodiment 3

[0048] Except for using 80 parts by mass of the light calcium carbonate dispersion slurry prepared in the Reference Example and 20 parts by mass of the wet heavy calcium carbonate, the same procedure as in Example 1 was carried out to prepare a coating liquid and a coated paper. Table 1 shows the physical properties of the coated paper.

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Abstract

A coating solution comprising: (A) an aragonite-type light calcium carbonate microparticle having an average major axis diameter of 1.0 to 2.8 [mu]m and an average minor axis diameter of 0.15 to 0.3 [mu]m, which is produced by diluting a calcium hydroxide slurry that has been treated by high-speed shearing until the slurry has a viscosity of 1000 cP or more at a concentration of 400 g / l to a concentration more than 50 g / l and then blowing carbon dioxide into the diluted slurry at a reaction starting temperature of 20 to 60 DEG C and at a rate of 1 to 3 I / min per kg of calcium hydroxide; and (B) a pigment comprising a wet heavy calcium carbonate cake. The coating solution enables to provide a coated paper having an excellent degree of brilliance and an excellent degree of whiteness, despite containing no kaolin.

Description

Technical field [0001] The present invention relates to a coating liquid that provides coated paper excellent in gloss and whiteness without using kaolin together, and a coated paper coated with the coating liquid. technical background [0002] The composition of the pigment used as a coated paper varies according to the grade of the product or the type of base paper or the amount of coating, but generally a mixed composition of kaolin and calcium carbonate can be used. Among them, kaolin helps to improve gloss, and calcium carbonate helps to improve whiteness. [0003] Therefore, as the calcium carbonate used in this composition, it is proposed that the long diameter 1.0 to 2.8 μm and the average short diameter 0.1 to 0.29 obtained by reacting carbon dioxide with calcium hydroxide of a specified viscosity under specified conditions while performing high-speed shear treatment μm aragonite columnar calcium carbonate (refer to Patent Document 1), by adjusting the blowing rate of ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D201/00C09D5/02C01F11/18D21H19/38C09D7/45C09D7/61
CPCD21H19/385C01P2004/10C08K3/26C09D7/1216C09D7/1283C09D7/1275C01P2004/61D21H21/52C01F11/181C09D7/61C09D7/68C09D7/69Y10T428/258C09D7/45C09D201/00D21H19/38
Inventor 下野和久高野达夫河津彻
Owner OKUTAMA IND
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