Recording Material With Hollow Polymeric Particles For Opacity Control
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Solution Overview
Problem
Existing recording materials face challenges in achieving improved performance and versatility in image formation without relying on expensive methods involving color precursors and developers, which are inherently unstable.
Innovation Solution
A recording material comprising a support with a layer of polymeric particles having a core/shell structure and an opacity reducer, where the particles have a specific glass transition temperature range and voids, allowing for image formation through heat or pressure exposure, reducing opacity and enhancing image visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If color precursors and developers are used for image formation, then image visibility can be achieved, but long term instability occurs
Solution Approach 1:
The invention extracts and eliminates the unstable color precursor and developer components from the formulation. Instead of using these reactive components, the patent employs pre-formed dyes combined with hollow polymer particles that provide opacity reduction through physical means rather than chemical reactions, thereby achieving long-term stability while maintaining image formation capability.
Solution Approach 2:
The invention replaces expensive and unstable color precursor/developer systems with simpler, more stable components. The use of conventional dyes with hollow polymer particles creates a formulation that is both chemically stable over time and easier to manufacture, effectively substituting complex short-lived chemical systems with robust, long-lasting alternatives.
2Illumination intensity
If hollow polymer particles are used to reduce opacity, then image visibility improves, but formulation complexity increases
Solution Approach 1:
The invention utilizes hollow polymer particles as porous materials that provide opacity reduction through their physical structure. These particles contain internal voids that scatter and reflect light, effectively reducing the opacity of the recording layer and improving image visibility. The hollow structure is achieved through simple emulsion polymerization techniques, maintaining formulation simplicity.
Solution Approach 2:
The invention creates a composite formulation by combining conventional dyes with hollow polymer particles. This composite approach allows the dye to provide color while the hollow particles provide opacity reduction, achieving enhanced image visibility without requiring complex single-component materials. The composite nature enables independent optimization of each component's properties.
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 solution provides a cost-effective and stable method for forming images with improved optical density and versatility, avoiding the instability issues associated with color precursors and developers, while maintaining high print quality.
Implementation Method 1
a layer comprising polymeric particles having a core/shell structure, said particles selected from the group consisting of: (i) particles having an outer polymer shell having a calculated Tg of from 40° C. to 130° C.; said particles comprising, when dry, at least one void
Implementation Method 2
from 1% to 90%, by weight based on the weight of said polymer particles, opacity reducer having a melting point of from 45° C. to 200° C.
Implementation Method 3
subjecting selected portions of said recording material to a physical agent selected from the group consisting of heat, pressure, and combinations thereof, sufficient to reduce the opacity of said selected portions
Data Source
AI summary
A recording material including a support and disposed thereon at least one layer including certain core/shell polymeric particles, the particles having, whey dry, at least one void; and an opacity reducer is provided. A method for providing an image using the recording sheet is also provided.