Paper coating agent and coated paper using same
A technology of coating agent and coated paper, applied in the direction of paper coating, papermaking, coating, etc., can solve problems such as adhesion, poor water resistance, insufficient viscosity stability of coating liquid, etc., and achieve excellent barrier and water resistance, Excellent viscosity stability effect
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Embodiment 1
[0156] (Production of Coating Agent for Paper)
[0157] The powder (10 parts) of the obtained ethylene-vinyl alcohol copolymer (A-1) was put into stirring water (90 parts, 20° C.), and heated to 95° C., thereby obtaining a dissolved ethylene-vinyl alcohol copolymer. Coating agent (aqueous solution) of substance (A-1). The viscosity stability of the obtained coating agent was evaluated according to the above-mentioned method. The results are shown in Table 2.
[0158] (Preparation of coated paper for measuring air resistance, print-through of oil-based ink, and water-resistant surface strength)
[0159] Using a two-roll sizer for testing (manufactured by Kumagai Riki Kogyo Co., Ltd.), the obtained coating agent was applied on a coating basis weight of 70 g / m under the conditions of 50° C. and 100 m / min. 2 , PPC (Plain paper copier) paper (high-quality paper) having an air resistance of 20 sec, and then dried at 100° C. for 5 minutes to obtain a coated paper. The coating wei...
Embodiment 2、3 and comparative example 1~4
[0163] The same procedure as in Example 1, except that the ethylene-vinyl alcohol copolymer (A-1) was changed to the ethylene-vinyl alcohol copolymers (A-2) to (A-6) or PVA-7 shown in Table 2 In the same manner, a coating agent and a coated paper were produced, and the physical properties of the coating agent and the coated paper were evaluated. The results are shown in Table 2. In addition, the copolymer (A-6) was insoluble in water, and an aqueous solution could not be obtained.
Embodiment 4~7
[0165] The powder (10 parts) of the ethylene-vinyl alcohol copolymer (A-2) was put into stirring water (90 parts, 20° C.), and heated to 95° C. to obtain the ethylene-vinyl alcohol copolymer dissolved therein. (A-2) aqueous solution. By mixing this aqueous solution, ionomer (Mitsui Chemicals Co., Ltd.'s ケミパール (registered trademark) S-100, sodium salt water dispersion of ethylene-acrylic acid copolymer) and water as needed, the copolymer ( In the aqueous solution of A-2), the coating agent of the aforementioned ionomer is dispersed. At this time, the addition amounts of the aforementioned aqueous solution, ionomer, and water were adjusted so that the composition of the coating agent was as shown in Table 2. The evaluation of the obtained coating agent was performed similarly to Example 1. In addition, except having used the obtained coating agent, it carried out similarly to Example 1, and carried out the manufacture of the coated paper and the evaluation of its physical prop...
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