Urethane Pretreatment Liquid for Boil-Resistant Inkjet Laminates

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Solution Overview

Problem

Existing image recording methods using pretreatment liquids for ink jet inks face challenges in achieving both storage stability and boiling resistance in laminates produced on impermeable base materials.

Innovation Solution

A pretreatment liquid containing aggregating agents like organic acids, polyvalent metal compounds, and metal complexes, combined with a urethane resin having polyol, polyisocyanate, and polyalkylene glycol monoalkyl ether units, is applied to improve adhesion and flexibility, enhancing both storage stability and boiling resistance of laminates.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a pretreatment liquid is applied to improve adhesion and flexibility for boiling resistance, then the boiling resistance of the laminate is improved, but the storage stability deteriorates

Engineering Contradiction:

Improveboiling resistanceVSAvoidstorage stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent changes the chemical parameters of the pretreatment liquid by specifying precise compositional ratios: aggregating agents at 0.1-10 wt%, urethane resin at 1-50 wt%, and controlled pH (2-7). These parameter changes enable the liquid to achieve both boiling resistance through proper adhesion and storage stability through optimized composition

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite pretreatment liquid system combining multiple components: aggregating agents (organic acids, metal compounds), urethane resin (with specific functional groups), and water. This composite formulation allows the liquid to simultaneously provide adhesion for boiling resistance and maintain storage stability through balanced chemical interactions

Inventive Principle:

Principle #40Composite materials

2Reliability

If aggregating agents are added to improve layer compatibility and adhesion, then the boiling resistance is improved, but the resin dispersibility worsens

Engineering Contradiction:

Improvelayer compatibilityVSAvoidresin dispersibility

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent optimizes the concentration range of aggregating agents (0.1-10 wt%) and urethane resin (1-50 wt%) to achieve the right balance. This parameter optimization ensures sufficient aggregation for layer compatibility while preventing excessive aggregation that would harm resin dispersibility

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses water as an intermediary medium that facilitates uniform dispersion of the urethane resin and aggregating agents. The aqueous base allows the components to distribute evenly before application, preventing clumping while maintaining the aggregating effect needed for adhesion

Inventive Principle:

Principle #24Intermediary (Mediator)

3Stability of the object's composition

If the pretreatment liquid is formulated to maintain storage stability, then the storage stability is improved, but the adhesion and flexibility worsen

Engineering Contradiction:

Improvestorage stabilityVSAvoidadhesion

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The patent adjusts the pH parameter (2-7) and compositional ratios to achieve a formulation that remains stable during storage yet provides strong adhesion upon application. The pH control ensures proper chemical reactivity for bonding while preventing premature aggregation that would reduce storage stability

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The solution provides improved boiling resistance and storage stability in laminates by ensuring better layer compatibility and adhesion to impermeable base materials, maintaining resin dispersibility and flexibility.

Implementation Method 1

a urethane resin, in which a polyol unit, a polyisocyanate unit, and a polyalkylene glycol monoalkyl ether unit are present

Methodology Applied

Scientific EffectCrosslinking: Chemical Bonding

Implementation Method 2

at least one aggregating agent selected from the group consisting of an organic acid, a polyvalent metal compound, and a metal complex

Methodology Applied

Scientific EffectAggregation: Coagulation

Implementation Method 3

a pretreatment liquid for an ink jet ink, which contains at least one aggregating agent selected from the group consisting of an organic acid, a polyvalent metal compound, and a metal complex, water, and a urethane resin

Methodology Applied

Scientific EffectSolvation: Solvation

Data Source

PatentEP4480712B1Pretreatment liquid for ink jet ink, ink set, image recording method, method of producing laminate, image recorded material, and laminate

Publication Date: 2026.03.25 FUJIFILM CORP

AI summary

Provided are a pretreatment liquid for an ink jet ink, including at least one aggregating agent selected from the group consisting of an organic acid, a polyvalent metal compound, and a metal complex, water, and a urethane resin, in which the urethane resin has a polyol unit, a polyisocyanate unit, and a polyalkylene glycol monoalkyl ether unit, and an application thereof.