Oil-Based Ink Composition for Writing Utensils

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Solution Overview

Problem

Existing oil-based ink compositions for writing utensils lack sufficient adherence and scratch resistance on various surfaces, particularly when used with aluminum pigments, and fail to provide effective metallic luster and suitable performance as an airbrush unit.

Innovation Solution

An oil-based ink composition containing an aluminum pigment, a colorant, a resin, an organic solvent, and polydimethylsiloxane with polyether-modifying groups at both ends, which improves adherence and scratch resistance by reducing the coefficient of friction and enhancing the affinity with the surface, allowing the main chain of polydimethylsiloxane to remain on the surface even under friction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If aluminum pigment is used to impart metallic luster, then the metallic luster is improved, but the adherence to writing surface deteriorates

Engineering Contradiction:

Improvemetallic lusterVSAvoidadherence to writing surface

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The patent introduces a specific resin composition as an intermediary substance between the aluminum pigment and the writing surface. This resin acts as a mediator that enhances the bonding between the metallic pigment particles and the substrate, preventing peeling while preserving the metallic luster effect.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent creates a composite ink composition by combining aluminum pigment with a specific mixture of resins (including polyvinyl butyral resin and other resins) and additives. This composite formulation works synergistically to provide both metallic appearance and improved adherence, resolving the contradiction between aesthetic effect and bonding strength.

Inventive Principle:

Principle #40Composite materials

2Ease of manufacture

If colorant is added to cover aluminum pigment surface, then the color is improved, but the scratch resistance deteriorates

Engineering Contradiction:

ImprovecolorVSAvoidscratch resistance

Core Design Contradiction:

Ease of manufactureVSStrength

Solution Approach 1:

The patent modifies the chemical composition parameters of the ink by selecting specific resin types and ratios (including polyvinyl butyral resin content of 10-50 mass%). This parameter optimization ensures that the colorant adheres strongly to the aluminum pigment surface through chemical bonding, preventing peeling and maintaining scratch resistance while achieving the desired color effect.

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If conventional resin composition is used, then the ease of manufacture is improved, but the adherence to various writing surfaces deteriorates

Engineering Contradiction:

Improveease of manufactureVSAvoidadherence to various writing surfaces

Core Design Contradiction:

Ease of manufactureVSAdaptability or versatility

Solution Approach 1:

The patent develops a multi-functional resin system that provides universal adherence to diverse writing surfaces (paper, plastic, glass, metal). The combination of polyvinyl butyral resin with other compatible resins creates a versatile binding system that adheres to both organic and inorganic substrates, making the ink composition universally applicable while maintaining ease of manufacture through standard formulation processes.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 ink composition exhibits improved adherence and scratch resistance on diverse surfaces, maintains metallic luster, and can be effectively used in writing utensils and airbrush units, providing stable and uniform coatings.

Implementation Method 1

improves adherence and scratch resistance by reducing the coefficient of friction

Methodology Applied

Scientific EffectFriction reduction: Friction

Implementation Method 2

enhancing the affinity with the surface

Methodology Applied

Scientific EffectAffinity: Adsorption

Data Source

PatentUS12054622B2Oil-based ink composition for writing utensils, writing utensil using same, and airbrush unit using same

Publication Date: 2024.08.06 MITSUBISHI PENCIL CO LTD

AI summary

Provided are an oil-based ink composition for writing utensils, a writing utensil using the same, and an airbrush unit using the same. The oil-based ink composition for writing utensils has good writing properties on writing surfaces of various materials and improved scratch resistance to scratches repeated or to scratches with stronger force on a marking after writing. The subject oil-based ink composition for writing utensils contains at least an aluminum pigment, a colorant, a resin, an organic solvent, and a polydimethylsiloxane, the polydimethylsiloxane having polyether-modifying groups at both ends, and a total number of hydroxyl groups on the polyether-modifying groups being 3 or greater.