Aqueous Marker Ink Composition for Non-Absorbing Surface Writing
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Solution Overview
Problem
Existing aqueous ink compositions for writing implements struggle with non-drying properties, vertical density differences in the pen core, and blurring of drawn lines, especially on non-absorbing surfaces.
Innovation Solution
An aqueous ink composition containing a neutralized isobutylene-maleic anhydride copolymer, specific surfactants, and water, with a balanced HLB value, enhances wetting on non-absorbing surfaces and stabilizes writing without blurring, while preventing pen core separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional aqueous ink compositions are used to improve writing performance on non-absorbing surfaces, then written line quality is improved, but non-drying property deteriorates and pen tip dries out
Solution Approach 1:
The patent changes the chemical composition parameters of the aqueous ink by incorporating specific surfactants (anionic, cationic, or nonionic) in controlled amounts (0.01-5 mass%). This parameter modification enables the ink to maintain liquid state at the pen tip while improving wetting on non-absorbing surfaces, resolving the contradiction between line quality and non-drying property
Solution Approach 2:
The patent creates a composite aqueous ink system combining coloring material, water, and specifically formulated surfactants. This composite material achieves both good wetting performance on non-absorbing surfaces and prevention of pen tip drying, as the surfactants modify the surface tension and interfacial properties of the ink
2Manufacturing precision
If conventional aqueous ink compositions are used to improve wetting on non-absorbing surfaces, then written line quality is improved, but vertical density difference in pen core increases causing blurring
Solution Approach 1:
The patent modifies the ink composition by adding surfactants that control the density distribution of the aqueous ink. The surfactants adjust the interfacial tension and prevent excessive settling of coloring material, thereby reducing vertical density differences in the pen core and preventing blurring while maintaining good wetting performance
3Stability of the object's composition
If conventional aqueous ink compositions are used to prevent pen core separation, then ink stability is improved, but drawn line drying property deteriorates
Solution Approach 1:
The patent changes the surface tension and evaporation rate parameters of the aqueous ink by incorporating surfactants. This allows the ink to remain stable in the pen core while controlling the drying rate on the writing surface, achieving both pen core uniformity and appropriate drawn line drying performance
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 ensures stable writing on non-absorbing surfaces without line repulsion, maintains non-drying properties, and prevents vertical density differences in the pen core, ensuring clear and consistent line quality.
Implementation Method 1
0.01 to 10 mass% of a neutralized product of an isobutylene-maleic anhydride copolymer, 0.001 to 5 mass% of one or more surfactants selected from an anionic surfactant and a nonionic surfactant
Implementation Method 2
readily gets wet on a non-absorbing surface
Implementation Method 3
has no difference in vertical density of a coloring material in a pen core
Implementation Method 4
aqueous ink composition containing at least a coloring material, 0.01 to 10 mass% of a neutralized product of an isobutylene-maleic anhydride copolymer, 0.001 to 5 mass% of one or more surfactants selected from an anionic surfactant and a nonionic surfactant, and water
Data Source
AI summary
Provided is an aqueous ink composition for a writing implement that is easily wetted on a non-absorbing surface, enables stable writing without repelling of a drawn line, prevents blurring of the drawn line even when a cap is removed, is excellent in non-drying property, has no difference in vertical density of a coloring material in a pen core, and is excellent in drawn line drying property, and a writing implement using the same favorable as a marking pen or a marker pen. The aqueous ink composition for a writing implement according to the present disclosure includes at least a coloring material, 0.01 to 10 mass% of a neutralized product of an isobutylene-maleic anhydride copolymer, 0.001 to 5 mass% of one or more surfactants selected from an anionic surfactant and a nonionic surfactant, and water.