JP-7856129-B2 - Aqueous composition liquid

Inventors

• 横濱 佑樹
• 高橋 聡
• 大山 光一朗
• 杉田 健人
• 黒羽 みずき

Assignees

• 株式会社リコー

Dates

Publication Date

20260511

Application Date

20241015

Claims (2)

1. An aqueous composition liquid discharged onto a substrate, The aqueous composition solution comprises water, a pigment, and a resin emulsion, wherein the resin emulsion contains resin emulsion A having a glass transition temperature (Tg) of 80°C or higher and resin emulsion B having a glass transition temperature (Tg) of 40 to 65°C. The ratio of resin emulsion A to resin emulsion B in the aqueous composition is 2 to 5 as the mass ratio of resin emulsion A to resin emulsion B. An aqueous composition liquid used in a recording device having a discharge mechanism for discharging the aqueous composition liquid onto a substrate, and a substrate processing mechanism for processing the substrate from which the aqueous composition liquid has been discharged by the discharge mechanism, wherein the substrate processing mechanism comprises a transport member for transporting the substrate while holding it, and a pressing member for bending and deforming a part of the transport member within the region in which the transport member holds the substrate .
2. Furthermore, the aqueous composition liquid according to claim 1, characterized by containing wax.

Description

This invention relates to an aqueous composition solution and a recording device. Inkjet printers, which utilize the inkjet recording method, are rapidly gaining popularity due to their small size, low cost, and ease of color printing. In recent years, there has been a demand for high-resolution ink recording at high speeds, and to meet this demand, the inks used in inkjet recording systems must satisfy a variety of characteristics. Traditionally, dye-based inks were widely used, but they had issues with weather resistance and insufficient image density on plain paper. Therefore, pigment-based inks have become widely used in recent years. Pigment-based inks offer high image density because the pigment particles remain on the paper surface, but conversely, their abrasion resistance is not sufficient. Conventionally, inks containing wax emulsions have been investigated to improve abrasion resistance (see, for example, Patent Document 1). This is a schematic diagram illustrating a recording device equipped with a substrate processing mechanism used in the present invention.This is a side view diagram illustrating the substrate processing mechanism of the present invention.This is an explanatory diagram of the pressing roller portion of the substrate processing mechanism of the present invention. Embodiments of the present invention will be described in further detail below. The recording device of the present invention comprises an aqueous composition liquid, a discharge mechanism for discharging the aqueous composition liquid onto a substrate, and a substrate processing mechanism for processing the substrate from which the aqueous composition liquid has been discharged by the discharge mechanism, wherein the substrate processing mechanism comprises a transport member for transporting the substrate while holding it, and a pressing member for bending and deforming a part of the transport member within the region in which the transport member holds the substrate, wherein the aqueous composition liquid contains water, a pigment, and a resin emulsion, and the resin emulsion contains resin emulsion A having a glass transition temperature (Tg) of 80°C or higher and resin emulsion B having a glass transition temperature (Tg) of 40 to 65°C. The recording device of the present invention can impart images with excellent image density and abrasive properties to a substrate. The mechanism of action is presumed to be as follows: when the substrate, held between the transport members in the substrate processing mechanism, is transported, the press member causes the transport member to bend and deform. This causes the substrate and the transport member to come into contact, abrasively rubbing the image. The frictional heat promotes the formation of a resin emulsion film in the aqueous composition liquid, smoothing the image surface, increasing gloss, improving image density, and enhancing abrasive properties. Furthermore, this effect is presumed to be further enhanced by the resin emulsions A and B contained in the aqueous composition liquid. First, the aqueous composition liquid in this invention will be described. This aqueous composition liquid comprises water, pigment, and resin emulsion, and may further contain organic solvents, penetrants, and other components as needed. While ink will be used as an example of the aqueous composition liquid in this invention below, the aqueous composition liquid in this invention is not limited to ink. <Organic Solvents> The organic solvent used in the present invention is not particularly limited, and water-soluble organic solvents can be used. Examples include polyhydric alcohols, ethers such as polyhydric alcohol alkyl ethers and polyhydric alcohol aryl ethers, nitrogen-containing heterocyclic compounds, amides, amines, and sulfur-containing compounds. Specific examples of water-soluble organic solvents include, for example, ethylene glycol, diethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 2,3-butanediol, 3-methyl-1,3-butanediol, triethylene glycol, polyethylene glycol, polypropylene glycol, 1,2-pentanediol, 1,3-pentanediol, 1,4-pentanediol, 2,4-pentanediol, 1,5-pentanediol. Polyhydric alcohols such as pentanediol, 1,2-hexanediol, 1,6-hexanediol, 1,3-hexanediol, 2,5-hexanediol, 1,5-hexanediol, glycerin, 1,2,6-hexanetriol, 2-ethyl-1,3-hexanediol, ethyl-1,2,4-butanetriol, 1,2,3-butanetriol, 2,2,4-trimethyl-1,3-pentanediol, petriol, ethylene glycol monoethyl ether, and ethylene glycol monobutyl ether. Examples include polyhydric alcohol alkyl ethers such as diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, tetraethylene glycol monomethyl ether, and propylene glycol monoethyl ether; polyhydric alcohol aryl ethers such as ethylene glycol monophenyl ether and ethylene glycol monobenzyl ether; nitrogen-containing heterocyclic compounds such as 2-pyrrolidone, N-methyl-2-pyrrolidone, N