Polyamine Treatment Solution for Ink-Jet Recording Optical Density
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Solution Overview
Problem
Conventional treatment solutions for ink-jet recording fail to simultaneously enhance optical density, highlighter-resisting property, and storage stability of recorded matter.
Innovation Solution
A treatment solution comprising a compound represented by the general formula (1) or its salt, blended with water, which improves optical density and provides excellent highlighter-resisting property and storage stability when used with a water-based ink set for ink jet recording.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional treatment solutions (polyallylamine, polyvalent metal ion) are used to improve optical density, then the optical density of recorded matter is improved, but the highlighter-resisting property and storage stability deteriorate
Solution Approach 1:
The patent changes the chemical parameters of the treatment solution by using a polyamine compound with specific molecular weight (10,000-100,000) and specific structural parameters (m=2-6, n=20-40). This parameter optimization allows the solution to simultaneously achieve high optical density (0.45 or more), good highlighter-resisting property, and storage stability, resolving the contradiction between improving optical density and maintaining reliability.
Solution Approach 2:
The patent employs a composite approach by combining water with a polyamine compound having specific structural characteristics. This composite treatment solution formulation enables simultaneous achievement of multiple properties: optical density improvement, highlighter-resisting property, and storage stability, thereby resolving the technical contradiction between these competing requirements.
2Illumination intensity
If polyallylamine and polyvalent metal ion are blended to improve optical density, then the optical density is improved, but the storage stability deteriorates
Solution Approach 1:
The patent optimizes the molecular weight parameter of the polyamine compound to 10,000-100,000 and specifies structural parameters (m=2-6, n=20-40). This parameter control prevents excessive aggregation and precipitation during storage while maintaining optical density improvement capability, thus resolving the contradiction between optical density enhancement and storage stability.
3Illumination intensity
If conventional treatment solutions are used to enhance optical density, then the optical density is improved, but the highlighter-resisting property deteriorates
Solution Approach 1:
The patent specifies precise structural parameters for the polyamine compound (m=2-6, n=20-40) which control the aggregation behavior of colorants. This optimization achieves sufficient optical density (0.45 or more) while preventing excessive aggregation that would cause highlighter penetration, thereby resolving the contradiction between optical density improvement and highlighter-resisting property.
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 effectively enhances optical density, maintains storage stability, and ensures the highlighter-resisting property of recorded matter, while maintaining jetting stability and preventing color change over time.
Implementation Method 1
The polyallylamine, polyvalent metal ion, etc. contained in the treatment solution are capable of causing a colorant in the water-based ink to aggregate on a recording medium, consequently making it possible to improve the optical density (OD value) of the recorded matter.
Data Source
AI summary
A treatment solution for ink-jet recording includes water; and a compound represented by the following general formula (1) or a salt thereof,wherein in the general formula (1), m is an integer from 2 to 6, n is an integer from 20 to 40.