White Pigment Composition Sedimentation Control
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Solution Overview
Problem
Ink jet recording methods face challenges in suppressing sedimentation of white pigment particles, leading to reduced whiteness and transparency issues when wet, particularly with inorganic pigments like titanium oxide due to their high specific gravity.
Innovation Solution
A white pigment composition combining titanium oxide with average particle diameters less than 100 nm and hollow particles with diameters of 100 nm or more, along with optional inorganic oxide particles, is used to minimize sedimentation and maintain whiteness, especially when wet, by controlling particle size and specific gravity ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If inorganic white pigment particles (titanium oxide) are used to achieve high whiteness, then whiteness is improved, but sedimentation occurs due to high specific gravity
Solution Approach 1:
The patent changes the particle size parameter of titanium oxide to less than 100 nm, which reduces the specific gravity effect and suppresses sedimentation while maintaining whiteness. This parameter change resolves the contradiction between achieving high whiteness and preventing sedimentation.
Solution Approach 2:
The patent creates a composite pigment system combining ultrafine titanium oxide particles with organic white pigment particles. This composite approach leverages the high whiteness of inorganic pigments while the organic component and controlled particle size prevent sedimentation, resolving the stability contradiction.
2Reliability
If larger white pigment particles are used to improve ejection stability, then ejection stability is improved, but sedimentation increases
Solution Approach 1:
The patent optimizes the particle size parameter to ultrafine scale (less than 100 nm), which surprisingly improves ejection stability while preventing sedimentation. This counterintuitive parameter change resolves the contradiction by achieving both ejection stability and sedimentation resistance through controlled nanoscale dimensions.
3Illumination intensity
If inorganic white pigment is used to maintain whiteness when wet, then whiteness is improved, but sedimentation occurs more readily
Solution Approach 1:
The patent changes the particle size parameter to ultrafine scale (less than 100 nm), which reduces the gravitational settling effect and maintains whiteness when wet without causing sedimentation. This parameter change simultaneously achieves both wet whiteness maintenance and sedimentation resistance.
Solution Approach 2:
The patent combines inorganic titanium oxide particles with organic white pigment particles in a composite system. This composite structure maintains the high whiteness of inorganic pigments when wet while the organic component and controlled particle size prevent sedimentation, resolving the contradiction between wet whiteness and sedimentation resistance.
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 composition effectively suppresses sedimentation and maintains high whiteness both in dry and wet states, improving ejection stability and abrasion resistance of the recorded matter.
Implementation Method 1
hollow particles having an average particle diameter D2 of 100 nm or more... suppresses sedimentation
Data Source
AI summary
A white pigment composition contains titanium oxide having an average particle diameter D1 of less than 100 nm; and hollow particles having an average particle diameter D2 of 100 nm or more.