Anchor Coating Composition for Stable Inkjet-Printable White Layers

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing anchor coating agents for corrugated cardboards lack sufficient storage stability, inkjet printability, coating film durability, and hiding power.

Innovation Solution

An anchor coating agent comprising a white pigment, an ionic salt, and an aqueous resin with an acid value of 50 mgKOH/g or less, preferably titanium oxide and calcium chloride, is used to form an anchor coat layer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a water-based ink containing acrylic resin is used to form an anchor coat layer, then inkjet printability is improved, but storage stability deteriorates

Engineering Contradiction:

Improveinkjet printabilityVSAvoidstorage stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent applies parameter changes by controlling the acid value of the aqueous resin to be 50 mgKOH/g or less and the glass transition temperature to be 70°C or lower. These specific parameter ranges optimize both storage stability and inkjet printability, resolving the contradiction between the two properties.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses a composite material system consisting of white pigment, ionic salt, and aqueous resin with controlled acid value. This composite formulation achieves synergistic effects where the ionic salt enhances storage stability while the aqueous resin with specific acid value ensures inkjet printability, resolving the contradiction between these two requirements.

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If conventional anchor coating agents are used, then coating process is simple, but coating film durability deteriorates

Engineering Contradiction:

Improvecoating process simplicityVSAvoidcoating film durability

Core Design Contradiction:

Ease of manufactureVSDuration of action of stationary object

Solution Approach 1:

The patent changes the chemical parameters of the coating agent by limiting the acid value to 50 mgKOH/g or less and glass transition temperature to 70°C or lower. These parameter modifications improve coating film durability without complicating the coating process, as the formulation remains applicable to standard water-repellent treated substrates.

Inventive Principle:

Principle #35Parameter changes

3Device complexity

If conventional anchor coating agents are used, then formulation is simple, but hiding power deteriorates

Engineering Contradiction:

Improveformulation complexityVSAvoidhiding power

Core Design Contradiction:

Device complexityVSIllumination intensity

Solution Approach 1:

The patent employs a composite material system combining white pigment, ionic salt, and aqueous resin with controlled acid value. This composite formulation enhances hiding power through the synergistic interaction of components while maintaining relatively simple formulation and application processes.

Inventive Principle:

Principle #40Composite materials

Data Source

PatentUS20260071084A1Anchor coat agent

Publication Date: 2026.03.12 SAKATA INX

AI summary

Provided is an anchor coating agent which is excellent in storage stability and can form an anchor coat layer excellent in inkjet printability, coating film durability, and hiding power. The present invention relates to an anchor coating agent containing a white pigment, an ionic salt, and an aqueous resin having an acid value of 50 mgKOH/g or less.