Polymer Modified Pigment Dispersion in Organic Solvents
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Solution Overview
Problem
Existing methods for producing polymer modified pigments are limited in achieving satisfactory dispersion stability in organic solvents, and are not universally applicable to general-purpose pigments.
Innovation Solution
The process involves mixing a pigment with a non-aqueous solvent and a copolymer of polymerizable unsaturated monomers, or an alkyd resin, followed by copolymerization, which allows for stable dispersion without the need for a dispersion stabilizer, enabling the use of a wide range of pigment types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If in-situ polymerization is carried out in an aqueous medium using conventional methods, then polymer modified pigment can be obtained, but the pigment must be specified to be stable in aqueous medium and dispersion stability is only obtained in aqueous medium, not in organic solvents
Solution Approach 1:
The patent changes the fundamental parameter of the polymerization medium from aqueous to non-aqueous organic solvent. By conducting in-situ polymerization in organic solvents like toluene, xylene, or chloroform, the resulting polymer modified pigment achieves dispersion stability in organic media rather than aqueous media, directly resolving the contradiction between dispersion stability and solvent versatility
Solution Approach 2:
The patent creates a composite structure where pigment particles are coated with polymers synthesized in non-aqueous environments. This composite material approach allows the pigment surface to be modified with polymers that are compatible with organic solvents, enabling the pigment to maintain stability in organic media while retaining its coloring function
2Manufacturing precision
If suspension polymerization is used with dispersion stabilizer, then polymer modified pigment can be obtained, but fine polymer modified pigments cannot be produced
Solution Approach 1:
The patent applies preliminary action by first forming a stable dispersion of pigment particles in the non-aqueous solvent before initiating polymerization. This pre-dispersion step ensures uniform distribution of pigment particles, which then serves as the template for polymer formation, enabling the production of fine polymer modified pigments without requiring complex suspension polymerization equipment or additional stabilizers
Solution Approach 2:
The patent extracts the dispersion stabilizer component from the process entirely. By conducting polymerization directly in non-aqueous solvents where pigment particles can be naturally dispersed, the method eliminates the need for separate dispersion stabilizers, simplifying the manufacturing process while achieving fine pigment production
3Adaptability or versatility
If silane coupling agent precoating is used, then polymer modified pigment can be obtained, but the method cannot be applied to organic pigments with poor affinity to silane coupling agents
Solution Approach 1:
The patent replaces silane coupling agents with non-aqueous solvents as the intermediary medium. These solvents serve as a universal interface that can accommodate various organic and inorganic pigments without requiring specific chemical affinity, thereby expanding pigment applicability while maintaining effective surface modification through the polymerization process
Solution Approach 2:
The patent achieves universality by using non-aqueous solvents that can work with a broad range of pigment types including organic pigments, inorganic pigments, treated and untreated pigments. The polymerization process itself becomes the universal surface treatment mechanism, eliminating the need for pigment-specific pre-treatment agents like silane coupling agents
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 polymer modified pigments with improved dispersion stability in organic solvents, suitable for various applications including paints, plastics, and printing inks, and can be applied to both treated and untreated pigments.
Implementation Method 1
copolymerizing: a copolymer (B-1) of a polymerizable unsaturated monomer containing at least one polymerizable unsaturated group soluble in a non-aqueous solvent, and at least one kind of polymerizable unsaturated monomer (C)
Implementation Method 2
polymerizing in the presence of a pigment (A) at least one kind of polymerizable unsaturated monomer (C)
Data Source
AI summary
A polymer modified pigment having a polymer (P-1) on the surface of a pigment (A), wherein the polymer (P-1) is obtained by copolymerizing a copolymer (B-1) of a polymerizable unsaturated monomer containing at least one polymerizable unsaturated group soluble in a non-aqueous solvent, and at least one kind of polymerizable unsaturated monomer (C), which is soluble in the non-aqueous solvent and either insoluble or poorly soluble following polymerization: and a polymer modified pigment having a polymer (P-2) on the surface of a pigment (A), wherein the polymer (P-2) is obtained by polymerizing at least one kind of polymerizable unsaturated monomer (C) soluble in the non-aqueous solvent and either insoluble or poorly soluble following polymerization, in the presence of an alkyd resin (B-2) soluble in a non-aqueous solvent.