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Polymer emulsion
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A polymer emulsion, polymer technology, applied in the direction of copying/marking method, application, coating, etc., can solve the problems of mildew, spoilage bacteria reproduction, etc.
Active Publication Date: 2020-04-10
KAO CORP
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[0009] In addition, in general, aqueous pigment dispersions such as water-based inks have the disadvantage of producing mildew over time or multiplying spoilage bacteria, so the use of antifungal agents and preservatives
Method used
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[0206] In the following preparation examples, production examples, examples, and comparative examples, "parts" and "%" mean "parts by mass" and "% by mass" unless otherwise specified. In addition, measurement and evaluation of various physical properties were performed by the following methods.
[0207] (1) Determination of the number average molecular weight of the polymer
[0208] Phosphoric acid (manufactured by Wako Pure Chemical Industries, Ltd., reagent grade) and lithium bromide (manufactured by Tokyo Kasei Kogyo Co., Ltd., reagent) were dissolved in N,N-dimethylformamide (Wako Junyaku Kogyo Co., Ltd., for high-speed liquid chromatography), the obtained solution was used as an eluent, and gel chromatography [GPC device (HLC-8120GPC) manufactured by Tosoh Corporation, Tosoh Corporation The manufactured column (TSK-GEL, α-M×2), flow rate: 1 mL / min] was used for measurement using monodisperse polystyrene with known molecular weight as a standard substance.
[0209] (2) A...
preparation example 1
[0235] Mix 74 parts of methacrylic acid (manufactured by Wako Pure Chemical Industries, Ltd.), 66 parts of styrene (manufactured by Wako Pure Chemical Industries, Ltd.), styrene macromonomer (manufactured by Toagosei Co., Ltd., trade name: AS-6S, Number average molecular weight: 6000, solid content concentration 50%) 40 parts (20 parts as solid content), polypropylene glycol monomethacrylate (manufactured by NOF Corporation, trade name: BLEMMER PP-800, propylene oxide average Add 40 parts of mole number (13, terminal: hydroxyl group) to prepare monomer mixed liquid. Add 20 parts of methyl ethyl ketone (MEK), 0.3 parts of 2-mercaptoethanol (polymerization chain transfer agent), and 10% of the above-mentioned monomer mixture into the reaction vessel and mix them, and fully perform nitrogen replacement.
[0236] On the other hand, the remaining 90% of the monomer mixture, 0.27 parts of the above-mentioned polymer chain transfer agent, 60 parts of MEK, and an azo-based radical pol...
preparation example 2～5
[0238] In Preparation Example 1, except that the quantity of the monomer component was the quantity shown in Table 1, it carried out similarly to Preparation Example 1, and obtained the water-insoluble polymer solution (ii)-(v) which has a carboxyl group. The results are shown in Table 1.
[0239] [Table 1]
[0240] Table 1
[0241]
[0242] *: The polymer solution used in the examples
[0243]
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Abstract
The present invention pertains to a polymer emulsion capable of exhibiting scratch resistance even when a coating film is formed or when recording is performed on a recording medium having low liquidabsorption, and a water-based ink for inkjet recording having exceptional ejection stability and bleed resistance during inkjet recording. [1] A polymer emulsion containing a polymer and water, wherein the polymer is a random copolymer or a block copolymer containing (a) structural units derived from one or more monomers selected from acrylic acid and methacrylic acid and (b) structural units derived from a hydrophobic vinyl monomer, the polymer moreover is a carboxy-group-containing polymer having an acid value of 150-300 mg KOH / g, and the polymer emulsion includes a compound that releases formaldehyde. [2] A water-based ink for inkjet recording, the water-based ink containing a pigment, the polymer, a water-soluble organic solvent, and water, wherein the water-soluble organic solvent includes one or more compounds selected from polyhydric alcohols and polyhydric alcohol alkyl ethers, the total amount of polyhydric alcohols and polyhydric alcohol alkyl ethers is 18% by mass or greaterin the ink, and the water-based ink for inkjet recording includes a compound that releases formaldehyde.
Description
technical field [0001] The present invention relates to polymer emulsions and aqueous inks for inkjet recording. Background technique [0002] The inkjet recording method is a recording method in which ink droplets are directly ejected from very fine nozzles onto a recording medium and adhered to obtain characters and images. This method has many advantages, such as easy and cheap full-color printing, plain paper can be used as a recording medium, and non-contact with the object to be printed, so it is remarkably popular. [0003] In recent years, in order to impart weather resistance and water resistance to printed matter, aqueous inks using pigments as colorants and polymers as binders or pigment dispersants have been widely used. [0004] For example, JP 2006-524269 (Patent Document 1) discloses latex particles having a specific bulk density and a specific surface dielectric constant as latex particles excellent in dispersion stability used in inkjet inks. [0005] In a...
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