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Process for producing dispersion of fine colored particles
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A technology of colored particles and manufacturing methods, applied in the direction of dyeing polymer organic compound treatment, application, coating, etc., can solve the problems of slow absorption of liquid components, non-absorption, poor scratch resistance, etc.
Active Publication Date: 2019-02-05
KAO CORP
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[0004] It is known that when inkjet recording is used to print on these low-absorbent and non-absorbent recording media, the absorption of liquid components is slow or not absorbed, so it takes time to dry and the abrasion resistance at the initial stage of printing Poor planning
In addition, it is known that, unlike plain paper in which pigments permeate into the paper, in the case of low-liquid-absorbent and non-liquid-absorbent recording media, pigment particles remain on the recording medium and directly receive external force, so drying Scratch resistance is also poor
Method used
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Embodiment 1-1～1-6 and comparative example 1-1～1-2
[0285] (Process 1: Manufacture of EC-1 to 6)
[0286] Vinyl monomers listed in Table 1-1, an emulsifier for emulsion polymerization (sodium polyoxyethylene alkyl ether sulfate: Kao Corporation, trade name "LATEMULE-118B"), and ion-exchanged water were added to a glass container. Using a stirring blade made of Teflon (registered trademark), it was stirred at 500 rpm for 30 minutes to obtain a pre-emulsion. At this time, when the emulsion polymerization is two-stage polymerization, pre-emulsions for the first stage and for the second stage are obtained.
[0287] (Process 2-1: Manufacture of PD-1 to 3)
[0288] Separately, the polymerizable surfactant described in Table 1-2 (polyoxyalkylene alkenyl ether ammonium sulfate: manufactured by Kao Corporation, trade name "LATEMULPD-104"), ion-exchanged water, Methyl ethyl ketone, C.I. Pigment Blue 15-3 (P.B.15-3), C.I. Pigment Yellow 155 (P.Y.155) or C.I. Pigment Red 122 (P.R.122) as a pigment, while cooling in an ice bath at 0°C, us...
Embodiment 2-1～2-6 and comparative example 2-1～2-3
[0312] The colored fine particle dispersion described in Table 2, 1N aqueous NaOH hydroxide solution as a neutralizing agent, and ion-exchanged water were added to a glass container, and stirred with a magnetic stirrer for 10 minutes to obtain a mixture A.
[0313] Separately, propylene glycol, diethylene glycol monoisobutyl ether, and polyether-modified silicone activator KF6011 (manufactured by Shin-Etsu Chemical Co., Ltd.) listed in Table 2 were added to a glass container, and stirred for 10 minutes with a magnetic stirrer to obtain Mixture B.
[0314] Next, the mixture B was added, stirring the mixture A, and it stirred for 1 hour as it was. Thereafter, filtration was performed using a 5 μm disposable membrane filter (Minisart, manufactured by Sartorius Co., Ltd.), to obtain a water-based ink.
[0315]
[0316] Using the obtained water-based ink, an inkjet recorded matter was produced as shown in (1) below, and scratch resistance was evaluated by the method shown in (2)...
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Abstract
The present invention relates to: [1] a process for producing a dispersion of fine colored particles by emulsion-polymerizing raw-material monomers including a crosslinking monomer in the presence ofa pigment, the process comprising step 1, in which the raw-material monomers including the crosslinking monomer in an amount of 0.1-10 mass% are mixed with a surfactant A and water and emulsified to obtain a pre-emulsion, and step 2, in which emulsion polymerization is conducted while feeding the pre-emulsion obtained in step 1 to a pigment pre-dispersion comprising a pigment and water, thereby obtaining a dispersion of fine colored particles; and [2] a process for producing a water-based ink, the process comprising the step of mixing the dispersion of fine colored particles obtained by the production process mentioned in [1] above, with an organic solvent.
Description
technical field [0001] The present invention relates to a method for producing a colored fine particle dispersion, and a method for producing an aqueous ink containing the colored fine particle dispersion. 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 a recorded matter on which characters and images are recorded. This method has many advantages such as easy realization of full color and low price, the ability to use plain paper as a recording medium, and no contact with the object to be recorded, so it has been significantly popularized. Recently, in order to impart weather resistance and water resistance to recorded materials, inks using pigments as colorants have been widely used. [0003] On the other hand, records for commercial printing applications obtained using low liquid-absorbent coated paper such as offset coated paper ...
Claims
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