Method of preparing aqueous dispersion, aqueous dispersion for aqueous printing ink and aqueous printing ink
A water-based dispersion, water-based ink technology, applied in the direction of ink, application, household appliances, etc., can solve the problem of unclear effect of pigment dispersion state ink color development ink gloss, etc., to achieve excellent gloss effect
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[0063] Hereinafter, although an Example and a comparative example are given and this invention is demonstrated concretely, this invention is not limited to these examples. In addition, in each example, unless otherwise specified, % means mass %.
manufacture example 1
[0066] Add 1,000 g of propylene glycol monomethyl ether acetate to a 3L four-neck flask equipped with a stirrer, thermometer, reflux condenser, dropping funnel, and nitrogen inlet tube, and adjust the temperature while stirring under a nitrogen atmosphere so that the inside of the flask reaches 145°C. A mixture consisting of 100 g of acrylic acid, 800 g of methyl methacrylate, 100 g of butyl acrylate, and 25 g of di-tert-butyl peroxide was added dropwise from the dropping funnel over 3 hours to perform a polymerization reaction.
[0067] After the dropwise addition was completed, propylene glycol monomethyl ether acetate was distilled off after being kept at 145°C for 2 hours to obtain a pale yellow solid polymer with a theoretical acid value of 78 mgKOH / g and a theoretical glass transition temperature (hereinafter abbreviated as Tg) of 80°C. Object (A-1). The weight average molecular weight of the obtained polymer (A-1) was 15,000.
manufacture example 2～7、 comparative example manufacture example 1～3
[0068] Production Examples 2 to 7, Production Examples 1 to 3 for Comparative Examples ((B-1) to (B-3))
[0069] (A-2) to (A-7) and (B-1) to (B-3) were obtained in the same manner as in Production Example 1 except that the monomers were changed to those described in Table 1. In addition, polymer (B-3) changed 1000 g of propylene glycol monomethyl ether acetates in manufacture example 1 into 2000 g, and manufactured it. The theoretical acid value of the solid matter of the polymers (A-2) to (A-7), (B-1) to (B-3) obtained in Production Examples 1 to 3 according to Production Examples 2 to 7 and Comparative Examples, Table 1 shows theoretical Tg and weight average molecular weight. Comparative example is that the theoretical acid value of polymer (A) is less than 50 with manufacturing example 1, and comparative example is that the theoretical acid value of polymer (A) is greater than 130 with manufacturing example 2, and comparative example is polymer (A) with manufacturing exam...
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