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Binder for water-based liquid inks, water-based liquid ink, and printed matter

A water-based liquid and adhesive technology, applied in the direction of ink, application, household utensils, etc., can solve the problems of reducing resolvability, not being able to print in a long run, and not spreading faster, and achieve excellent resolvability.

Active Publication Date: 2019-01-04
DAINIPPON INK & CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, compared with solvent-based liquid inks, water-based liquid inks have advantages in terms of adhesion to films, anti-blocking with backside smearing of printed patterns, and mutual contamination caused by ink drying on plates during long-run printing. In terms of "ink resolvability", seek to further improve performance, otherwise it will not be fully recognized, and it is not expected to be popularized faster. This is the current situation of water-based liquid ink
[0007] As an example of the front printing water-based ink composition for packaging, a polyhydrazide compound and a polyamine compound other than the polyhydrazide compound are reacted with an isocyanate group-containing polymer, and the organic solvent solution of the polyurethane resin thus obtained is mixed with ammonia water Although the invention of using water-soluble polyurethane resin as an adhesive by neutralizing it with deionized water has been completed, it cannot be said that the resolubility is sufficient even if the adhesion and anti-blocking properties to the film can be maintained. In particular, it cannot be said that it can withstand long-run printing (for example, Patent Document 1: Japanese Patent Application Laid-Open No. 8-053641)

Method used

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  • Binder for water-based liquid inks, water-based liquid ink, and printed matter
  • Binder for water-based liquid inks, water-based liquid ink, and printed matter
  • Binder for water-based liquid inks, water-based liquid ink, and printed matter

Examples

Experimental program
Comparison scheme
Effect test

Synthetic example 1

[0086] (Synthesis Example 1: Preparation of Binder for Aqueous Liquid Ink (1))

[0087] 191 parts by mass of polyoxytetramethylene glycol (molecular weight: 2000), 141 parts by mass of isophorone diisocyanate, 2,2- 26 parts by mass of dimethylolpropionic acid react in a mixed solvent of 28 parts by mass of 1,4-cyclohexanedimethanol and 200 parts by mass of methyl ethyl ketone to obtain a prepolymerized carbamate having an isocyanate group at the molecular end. organic solvent solutions.

[0088] Next, by adding 20 parts by mass of a 50% potassium hydroxide aqueous solution, part or all of the carboxyl groups contained in the above-mentioned urethane prepolymer were neutralized, and 700 parts by mass of water and 9.0 parts by mass of an 80% aqueous hydrazine solution were added to fully Stirring was carried out to obtain an aqueous dispersion of polyurethane resin, followed by aging-desolventization to obtain a binder for aqueous liquid ink (1) with 40% by mass of non-volatile...

Synthetic example 2

[0091] (Synthesis Example 2: Preparation of Binder for Aqueous Liquid Ink (2))

[0092] 256 parts by mass of polyoxytetramethylene glycol (molecular weight: 2000), 102 parts by mass of isophorone diisocyanate, 2,2-bis 23 parts by mass of methylolpropionic acid were reacted in a mixed solvent of 6.5 parts by mass of neopentyl glycol and 200 parts by mass of methyl ethyl ketone to obtain an organic solvent solution of a urethane prepolymer having an isocyanate group at a molecular end.

[0093] Next, by adding 18 parts by mass of a 50% potassium hydroxide aqueous solution, part or all of the carboxyl groups contained in the above-mentioned urethane prepolymer were neutralized, and 700 parts by mass of water and 6.5 parts by mass of an 80% aqueous solution of hydrazine were added to fully Stirring was carried out to obtain an aqueous dispersion of polyurethane resin, followed by aging-desolventization to obtain an aqueous liquid ink binder (2) with 40% by mass of non-volatile com...

Synthetic example 3

[0095] (Synthesis Example 3: Preparation of Binder for Aqueous Liquid Ink (3))

[0096] 263 parts by mass of polyoxytetramethylene glycol (molecular weight: 2000), 98 parts by mass of isophorone diisocyanate, 2,2-bis 22 parts by mass of methylolpropionic acid react in a mixed solvent of 5.6 parts by mass of 1,4-cyclohexanedimethanol and 200 parts by mass of methyl ethyl ketone to obtain a urethane prepolymer having an isocyanate group at the molecular end of organic solvent solutions.

[0097] Next, by adding 17 parts by mass of a 50% potassium hydroxide aqueous solution, part or all of the carboxyl groups possessed by the above-mentioned urethane prepolymer was neutralized, and 700 parts by mass of water and 6.2 parts by mass of an 80% aqueous hydrazine solution were added and fully stirred, Thus, an aqueous dispersion of the polyurethane resin was obtained, followed by aging-desolventization, to obtain a binder for aqueous liquid ink (3) with 40% by mass of non-volatile mat...

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Abstract

Provided are: a binder for water-based liquid inks, which is usable in water-based liquid inks excellent in terms of adhesion to substrates, blocking resistance, and ink redissolution; and a water-based liquid ink composition including the binder. This binder for water-based liquid inks comprises: a urethane resin (A) that is a product of the reaction of polyols (a1) comprising an acid-group-containing polyol (a1-1) and a polyether polyol (a1-2) other than the polyol (a1-1) with a polyisocyanate (a2); and an aqueous medium (B). Said binder is characterized in that the urethane resin (A) has anacid group that has been neutralized with a metal salt, and the urethane resin (A) includes an alicyclic structure in an amount in the range of 1,000-5,000 mmol / kg with respect to the entire urethaneresin (A).

Description

technical field [0001] The present invention relates to a resin binder for water-based liquid ink, which can be used for water-based gravure printing and water-based flexographic printing, and a water-based liquid ink composition. Background technique [0002] Water-based gravure printing and water-based flexographic printing are widely used to impart beauty and functionality to printed objects. [0003] In recent years, in the printing ink industry, based on the viewpoint of sustainable development in the background of the deterioration of air pollution caused by VOC contained in solvent-based printing inks, global warming, etc. Furthermore, it is inflammable and explosive, and there is a tendency to switch away from petroleum resources, and the restrictions on the use of organic solvents are becoming increasingly strict. [0004] On the other hand, population growth, rising income levels, and changes in logistics systems have resulted in an increase in the consumption of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D11/102
CPCC09D11/102
Inventor 佐坂利桂小田克郞石桥岁德冈康孝永浜定佐竹直人
Owner DAINIPPON INK & CHEM INC
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