Metallic Ink Composition for Capillary Markers
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Solution Overview
Problem
Conventional capillary-action markers with metallic pigments face issues such as settling of pigments, clogging, and inconsistent delivery due to the density, size, and surface treatment of metallic pigments, leading to poor writing performance and premature failure.
Innovation Solution
A metallic ink composition with a pigment to resin component ratio between 0.70 and 2.00 and a resin component having a mean hydroxyl number between 20 and 120, which enhances the suspension and delivery of metallic pigments, preventing clogging and ensuring consistent decorative effects over the marker's lifetime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If metallic pigments are incorporated into low viscosity ink compositions for capillary-action markers, then the ink can flow through the marker, but the metallic pigments tend to settle out of the ink composition
Solution Approach 1:
The patent modifies the chemical parameters of the ink composition by introducing a resin component with specific hydroxyl number (20-120) and controlling the pigment-to-resin ratio (0.70-2.00). This changes the ink's viscosity and adhesive properties, allowing it to maintain pigment suspension while still flowing through the capillary marker system.
Solution Approach 2:
The resin component acts as an intermediary substance between the metallic pigments and the ink vehicle. It provides adhesive forces that counteract gravitational settling, keeping pigments suspended during storage while allowing the ink to flow during use.
2Speed
If metallic pigments are suspended in low viscosity ink compositions, then the ink flows well, but the marker's fibers filter the metallic pigments and become clogged over time
Solution Approach 1:
The resin component serves as a protective intermediary that coats the metallic pigments, preventing them from being filtered and trapped by the marker's fibrous structure. This reduces clogging and maintains reliable marker operation over time.
Solution Approach 2:
By adjusting the ink's viscosity and adhesive properties through the resin component, the patent modifies the interaction between ink and marker fibers, reducing unwanted filtration and clogging while maintaining adequate flow.
3Ease of operation
If conventional ink formulations are used in capillary-action markers, then the marker operates initially, but the ink composition becomes non-homogeneous over time leading to inconsistent delivery
Solution Approach 1:
The resin component acts as a stabilizing intermediary that maintains uniform distribution of metallic pigments throughout the ink composition during storage, ensuring consistent ink delivery performance over the marker's lifetime.
Solution Approach 2:
The patent optimizes the adhesive-cohesive force balance by controlling resin content and properties, preventing pigment settling and maintaining ink homogeneity throughout the product's service life.
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 described ink composition effectively primes the nib, ensuring uniform delivery of metallic pigments, preventing both over- and under-priming, and maintaining writing performance by minimizing interactions between the pigment and the ink reservoir fibers, thus providing a consistent and desired decorative effect.
Implementation Method 1
the adhesive forces (between the ink composition and the channel walls of the reservoir and/or nib) must exceed the cohesive forces of the ink composition
Implementation Method 2
conventional capillary-action markers contain a fibrous ink reservoir and a nib in fluid communication therewith
Data Source
AI summary
Metallic ink compositions for use in capillary- action markers are provided. More particularly, a metallic ink composition includes an organic solvent, a metallic pigment, and a resin component.