Ink Copolymer with Biphenyl Groups for High Density Printing
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Solution Overview
Problem
Inkjet recording technologies face challenges with image density and beading issues on permeable and non-permeable media due to pigment ink penetration into paper, leading to reduced surface density and stability concerns.
Innovation Solution
An ink formulation incorporating a copolymer with specific structure units, including biphenyl or naphthyl groups for pigment adsorption and a high glass transition temperature unit to enhance image density and prevent beading, combined with a water-soluble organic solvent for improved permeation and storage stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If pigment ink concentration is increased to enhance image density, then image density improves, but ink viscosity increases and discharging stability degrades
Solution Approach 1:
A polymer compound with specific glass transition temperature (50-150°C) acts as an intermediary substance between the pigment particles and the ink vehicle. This polymer mediates the interaction by providing a temperature-dependent structural framework that stabilizes pigment dispersion at storage temperatures while allowing controlled release and deposition at printing temperatures, thus resolving the contradiction between high pigment concentration and discharging stability
Solution Approach 2:
The patent utilizes temperature as a critical parameter to resolve the contradiction. The polymer's glass transition temperature (50-150°C) creates a parameter-based transition: below Tg, the polymer provides rigid structure for stable pigment suspension; above Tg, the polymer becomes more flexible allowing ink flow and pigment deposition. This parameter change enables high pigment concentration without compromising discharging stability
2Manufacturing precision
If pigment ink is used on water-absorbing recording media, then penetration into paper occurs, but surface density decreases
Solution Approach 1:
The polymer compound performs preliminary action by forming a protective framework around pigment particles before they contact the recording media. This pre-formed structure controls the penetration process, allowing the ink to be absorbed by water-absorbing media while the polymer framework maintains pigment particles near the surface, preventing excessive penetration and maintaining surface density
Solution Approach 2:
The glass transition temperature parameter of the polymer (50-150°C) creates a temperature-dependent mechanism where at printing temperature the polymer provides controlled flexibility allowing superficial penetration while maintaining surface concentration. This parameter-based control resolves the contradiction between media absorption and surface density retention
3Manufacturing precision
If pigment is deposited on non-permeable media, then beading occurs, but image uniformity deteriorates
Solution Approach 1:
The polymer compound acts as an intermediary that modifies the interface between pigment and non-permeable media. It provides a temperature-dependent wetting mechanism: below Tg it maintains structured dispersion preventing premature beading; at printing temperature it allows controlled spreading and uniform deposition on non-permeable surfaces, eliminating beading while maintaining image uniformity
Solution Approach 2:
The glass transition temperature parameter (50-150°C) creates a thermal switch mechanism that controls surface tension and wetting properties. Below Tg, the polymer maintains rigid structure preventing beading; at printing temperature, the polymer softens allowing uniform spreading on non-permeable media. This parameter-based transition resolves the beading issue while maintaining image uniformity
4Object-generated harmful factors
If polymer with rapid destabilization in contact with paper is used, then beading is prevented, but storage stability decreases
Solution Approach 1:
The patent introduces glass transition temperature (50-150°C) as a critical parameter that controls polymer behavior. Below Tg, the polymer maintains stable, rigid structure ensuring storage stability; at printing temperature (above Tg), the polymer becomes flexible enabling beading prevention and uniform deposition. This parameter-based dual-state behavior resolves the contradiction between storage stability and beading prevention
Solution Approach 2:
The polymer transitions from a static, stable state during storage to a dynamic, flexible state during printing. The glass transition temperature enables this dynamic transformation: the polymer is rigid and stable at storage conditions but becomes dynamic and adaptive at printing conditions, allowing it to prevent beading while maintaining storage stability
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 achieves high image density and resolution on various media while preventing beading and ensuring storage stability, even during high-speed printing.
Implementation Method 1
the polymer includes a structure unit represented by the following Chemical formula 1 and a structure unit represented by the following Chemical formula 2 or the following Chemical formula 3... M and Q each, independently represent naphthyl groups or biphenyl groups
Implementation Method 2
an inkjet ink has been proposed in JP-4687110-B (JP-2006-188624-A) which contains at least water, an organic solvent, and a polymer, wherein the polymer contained in the inkjet ink demonstrates upper critical solution temperature (UCST) type separation in the range of from 0 to 100 degrees C when the inkjet ink or water contained in the inkjet ink is partially evaporated
Data Source
Figure 1~2
AI summary
An ink includes water; a coloring material, and a polymer including a structure unit represented by the following Chemical formula 1 and a structure unit represented by the following Chemical formula 2 or the following Chemical formula 3, where R and T each, independently represent hydrogen atoms or methyl groups, L and N each, independently represent single bonds or carbonyl groups, M and Q each, independently represent naphthyl groups or biphenyl groups, p represents an integer of from 2 to 12, and q represents an integer of from 1 to 3