Aqueous Ink Composition with Colored and Non-Colored Microspheres
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Solution Overview
Problem
Existing aqueous ink compositions for writing instruments face challenges in achieving desired saturation levels and hue variability due to limitations in water resistance and light fastness, particularly with microcapsule-based inks.
Innovation Solution
An aqueous ink composition comprising colored microspheres with a polymer matrix and water-insoluble dyes, along with non-colored microspheres, which enhances saturation by preventing settling and light reflection, allowing for improved hue control and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If microcapsules containing dye or pigment are used to achieve water resistance and light resistance, then water resistance and light resistance are improved, but saturation is difficult to obtain and degree of freedom in attainable hues is limited
Solution Approach 1:
The ink composition is segmented into multiple functional components: colored microspheres (0.01-5 mass%) providing color and saturation, non-colored microspheres (5-50 mass%) providing water resistance and light resistance, and aqueous medium. This segmentation allows each component to optimize its specific function without compromising others, achieving both high saturation and durability.
Solution Approach 2:
The invention uses a composite material system combining colored microspheres, non-colored microspheres, and aqueous components. The non-colored microspheres act as a protective matrix that provides water and light resistance while allowing the colored microspheres to maintain their saturation and hue properties, resolving the contradiction between durability and color quality.
2Adaptability or versatility
If pigments of different hues are mixed and toned to obtain desired hue, then hue variety is improved, but stability of the ink is often impaired due to differences in properties of the pigments
Solution Approach 1:
Each pigment type is encapsulated within its own microsphere structure with locally optimized properties. The non-colored microspheres provide a uniform protective environment for all colored microspheres, allowing different hues to be mixed without compromising overall ink stability, as each microsphere maintains its individual integrity.
Solution Approach 2:
The invention changes the physical state and distribution parameters of pigments by encapsulating them in microspheres with controlled size (0.1-5 μm for colored, 1-10 μm for non-colored). This parameter change allows stable mixing of different hues while maintaining uniform dispersion and preventing aggregation, resolving the stability issue.
3Ease of manufacture
If dye is used for coloring, then ease of coloring is improved, but water resistance and light fastness are inferior causing characters and lines to become blurry or erased
Solution Approach 1:
The colored microspheres are nested within the aqueous ink composition containing non-colored microspheres. The outer non-colored microspheres act as a protective shell that provides water and light resistance, while the inner colored microspheres maintain their coloring properties. This nested structure allows dye-based coloring ease while achieving the durability normally associated with pigments.
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 higher saturation values, up to 200% or more, and facilitates easier attainment of desired hues by ensuring uniform dispersion of microspheres, thereby improving color consistency and resistance to fading.
Implementation Method 1
the non-colored microspheres cover the paper surface, whereby reflection of visible light by the paper can be prevented
Implementation Method 2
colored microspheres comprising water, a matrix composed of a polymer, and a water-insoluble dye
Implementation Method 3
a water-insoluble dye
Data Source
AI summary
Provided is an aqueous ink composition for writing instruments, which enables desired colorfulness to be obtained easily. The aqueous ink composition for writing instruments according to the present invention contains: pigmented microspheres each having a matrix comprising water and a polymer, and a water-insoluble dye; and unpigmented microspheres.