Water-Based Ink Viscosity Control for Glitter Pigment Drain
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The clear drain property of ink compositions for writing instruments is impaired when glitter pigments such as aluminum or pearl pigments are used, and existing solutions do not fully address this issue. Additionally, there is a need for inks that adhere well to paper surfaces like inkjet postcard paper without being easily repelled.
Innovation Solution
A water-based ink composition containing a glitter pigment, polyoxyalkylene glycol, and a thickener, with a viscosity of 500 to 2000 mPa·s at 25°C and a shear rate of 3.83 sec^-1, which includes specific thickener combinations like xanthan gum and succinoglycan, and optionally a silica-coated aluminum pigment and a phosphate ester with a HLB of 10 or less.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If glitter pigment is used in ink composition, then decorative effect is improved, but clear drain property deteriorates
Solution Approach 1:
The invention changes the viscosity parameter of the ink composition to a specific range (500-2000 mPa·s) to resolve the contradiction between decorative effect and clear drain property. This viscosity optimization prevents glitter pigment aggregation while maintaining ink flow and storage tube clarity.
Solution Approach 2:
The invention uses a composite thickening system combining multiple thickeners (e.g., xanthan gum, succinoglycan, diutan gum) to achieve the optimal viscosity range. This composite approach provides both the decorative glitter effect and the clear drain property by controlling ink rheology.
2Ease of operation
If water-based ink is used, then safety and ease of use are improved, but adhesion to lightly coated paper deteriorates
Solution Approach 1:
The invention optimizes the viscosity parameter (500-2000 mPa·s) to enhance ink adhesion to lightly coated paper while maintaining water-based safety. The controlled viscosity ensures proper ink flow and penetration without requiring solvent-based formulations.
Solution Approach 2:
The invention applies local quality by optimizing ink properties specifically for interaction with lightly coated paper surfaces. The thickening agents and viscosity control create localized adhesion enhancement at the paper-ink interface while maintaining overall water-based ink characteristics.
3Reliability
If high viscosity is used to improve adhesion, then ink adhesion is improved, but writability deteriorates
Solution Approach 1:
The invention precisely controls the viscosity parameter within the range of 500-2000 mPa·s to balance adhesion and writability. This optimized viscosity range ensures sufficient adhesion to lightly coated paper while maintaining smooth flow and ease of writing.
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 achieves excellent clear drain property and good ink adhesion to lightly coated paper, preventing easy repulsion and maintaining satisfactory writability.
Implementation Method 1
The ink has a viscosity, measured under conditions of a temperature of 25°C and a shear rate of 3.83 sec -1, of 500 to 2000 mPa·s
Implementation Method 2
the thickener is at least one selected from the group consisting of xanthan gum, succinoglycan, and diutan gum
Implementation Method 3
has good ink adhesion to paper surfaces through which water-based inks do not easily penetrate
Data Source
AI summary
The water-based ink composition for writing instruments of the present invention contains at least a glitter pigment, polyoxyalkylene glycol, and a thickener, and has a viscosity, measured under conditions of a temperature of 25°C and a shear rate of 3.83 sec-1, of 500 to 2000 mPa•s.