Water-Based Ink Set With Shared Resin Bonding for Impermeable Media

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Solution Overview

Problem

Existing inks used on impermeable recording media, such as solvent-based and ultraviolet-curable inks, face issues with environmental impact, safety concerns, and insufficient adhesiveness and abrasion resistance, while water-based inks struggle to provide adequate abrasion resistance in practical use.

Innovation Solution

An ink set comprising a pretreatment liquid, color ink, and clear ink, where the resins in each have an identical type of bonding structure in their repeating units, enhancing adhesiveness and abrasion resistance on impermeable base materials.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If solvent-based ink or ultraviolet-curable ink is used, then adhesiveness and abrasion resistance are improved, but environmental impact worsens and safety concerns increase

Engineering Contradiction:
Improveadhesiveness and abrasion resistanceVSAvoidenvironmental impact and safety concerns
Core Design Contradiction:
ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The invention changes the chemical composition parameters of the ink by using water-based resins with specific bonding structures (urethane bonds, ester bonds, or amide bonds) instead of traditional solvent-based or UV-curable chemicals, achieving both environmental safety and durable adhesion on impermeable substrates

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The invention uses composite resin systems combining specific types of water-based resins (urethane, ester, or amide bonds) with carefully selected additives to achieve the performance previously only attainable with harmful solvent-based or UV-curable formulations

Inventive Principle:
Principle #40Composite materials

2Object-affected harmful factors

If water-based ink is used, then environmental impact is reduced, but adhesiveness and abrasion resistance deteriorate

Engineering Contradiction:
Improveenvironmental impactVSAvoidadhesiveness and abrasion resistance
Core Design Contradiction:
Object-affected harmful factorsVSReliability

Solution Approach 1:

The invention fundamentally changes the resin bonding structure parameters in water-based inks by specifying urethane, ester, or amide bonds in the repeating units, which provides the chemical durability and adhesion strength previously unattainable with conventional water-based formulations

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The invention applies specific resin types with particular bonding structures to key functional areas of the ink formulation (pretreatment liquid, color ink, and clear ink) to maximize adhesion and abrasion resistance where most needed while maintaining the environmental benefits of water-based formulation

Inventive Principle:
Principle #3Local quality

3Adaptability or versatility

If different resin types are used in pretreatment liquid, color ink, and clear ink, then formulation flexibility is improved, but compatibility and overall performance worsen

Engineering Contradiction:
Improveformulation flexibilityVSAvoidcompatibility and overall performance
Core Design Contradiction:
Adaptability or versatilityVSReliability

Solution Approach 1:

The invention establishes homogeneity in the bonding structure type across all three ink components (pretreatment liquid, color ink, and clear ink), ensuring compatible resin interactions and unified performance characteristics while maintaining systematic formulation flexibility

Inventive Principle:
Principle #33Homogeneity

Solution Approach 2:

The invention creates a universal resin bonding structure framework that can be applied across different ink types and substrate materials, providing consistent adhesion and abrasion resistance performance throughout the entire ink system

Inventive Principle:
Principle #6Universality (Multi-functionality)

Data Source

PatentUS12441902B2Ink set, image forming method, and image forming apparatus
Publication Date: 2025.10.14 RICOH CO LTD
  • US12441902B2 patent drawing
  • US12441902B2 patent drawing
  • US12441902B2 patent drawing

AI summary

An ink set is provided that includes a pretreatment liquid containing a resin (R1), a color ink containing a resin (R2), and a clear ink containing a resin (R3), in which the resin (R1), the resin (R2), and the resin (R3) have an identical type of bonding structure in a repeating unit of a molecule.