Functionalized Colorant Dispersion in Latex Polymerization
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Solution Overview
Problem
Natural pigments like indigo are difficult to disperse in latex due to their large particle size and lack of functionality, making it challenging to integrate them into toner particles effectively during aggregation and coalescence.
Innovation Solution
The process involves forming an emulsion with a monomer and a colorant having an anionic functional group and a lipophilic counter ion, which is then polymerized to create latex particles with the colorant dispersed within the polymer matrix, allowing for efficient colorant distribution in toner particles without the need for dispersion during aggregation/coalescence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If natural pigments like indigo are used as colorants, then colorant functionality is improved, but dispersion difficulty increases due to large particle size and lack of functionality
Solution Approach 1:
The patent modifies the chemical parameters of natural pigments by introducing functional groups (such as carboxylic acid groups through oxidation or sulfonation) and changing their molecular structure. This transforms large, non-functional pigment particles into smaller, functionalized colorants that can be effectively dispersed in latex systems during polymerization, resolving the contradiction between maintaining colorant functionality and achieving easy dispersion.
2Stability of the object's composition
If colorant is added during aggregation and coalescence, then colorant integration is attempted, but dispersion effectiveness deteriorates due to large particle size
Solution Approach 1:
The patent applies preliminary action by functionalizing and reducing the pigment particles before the aggregation and coalescence process. The colorant is pre-modified with functional groups that enable it to participate in the polymerization reaction, ensuring uniform dispersion throughout the latex matrix from the beginning, rather than attempting to disperse large particles during the aggregation stage.
Solution Approach 2:
The patent introduces functional groups as intermediaries that mediate between the natural pigment and the latex system. These functional groups (such as carboxylic acid or sulfate groups) act as bridges, enabling the pigment to interact with the polymerizing monomers and become uniformly distributed within the forming polymer particles, rather than remaining as separate large particles.
3Ease of operation
If conventional dispersion methods are used during aggregation/coalescence, then colorant addition is simplified, but surfactant usage increases and reactor fouling occurs
Solution Approach 1:
The patent implements self-service by designing the colorant to be self-dispersing through its functional groups. The functionalized colorant can directly interact with the polymerizing monomers and incorporate into the polymer matrix without requiring external surfactants for dispersion. The colorant itself provides the necessary surface activity through its functional groups, eliminating the need for additional surfactant additives.
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
This method results in toner particles with improved colorant distribution, reduced surfactant usage, and the ability to produce nanosized particles with good light stability and narrow particle size distribution, while minimizing reactor fouling.
Implementation Method 1
polymerizing the monomer to form a latex, the latex comprising polymer nanoparticles having the colorant dispersed therein
Implementation Method 2
a colorant comprising an anionic functional group and a lipophilic counter ion dispersed within a matrix of the copolymer nanoparticles
Data Source
AI summary
A process includes forming an emulsion comprising a monomer and a colorant, the colorant further including an anionic functional group and a lipophilic counter ion, and polymerizing the monomer to form a latex, the latex includes polymer nanoparticles having the colorant dispersed therein.