Polymer Dispersant for Inkjet Clogging and Viscosity
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Solution Overview
Problem
Existing dispersants for paints and inks face challenges in achieving enhanced mill base viscosity, stability, pigment dispersion, and reduced viscosity, particularly in inkjet printing, where they often suffer from clogging issues due to shear thinning and limited pigment loading.
Innovation Solution
A polymer is synthesized by polymerizing a mono-vinyl monomer with carboxylic acid groups and reacting it with primary hydrocarbyl amines and polyoxyalkylene amines to form amide or ester linkages, resulting in a composition that improves dispersion stability and reduces viscosity, suitable for use in paints, inks, and inkjet printing inks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing dispersants are used in inkjet printing, then pigment dispersion is achieved, but clogging occurs due to shear thinning and limited pigment loading
Solution Approach 1:
The patent modifies the chemical structure of dispersants by incorporating specific functional groups (carboxylic acid, hydroxyl, amine) and controlling molecular weight (100-100,000 Da) to optimize performance. The dispersant composition is adjusted to contain 0.1-10% by weight of the modified dispersant, which resolves the contradiction between pigment loading capacity and clogging resistance by changing the physical-chemical parameters of the dispersant molecule itself
Solution Approach 2:
The invention uses composite dispersant systems combining multiple functional components: modified polymeric dispersants with specific functional groups, and complementary additives. This composite approach allows simultaneous achievement of high pigment loading and resistance to clogging, as different components address different aspects of the contradiction
2Stability of the object's composition
If polymer molecular weight is increased to improve dispersion stability, then stability enhances, but viscosity increases
Solution Approach 1:
The patent optimizes polymer molecular weight within specific ranges (100-100,000 Da) to balance stability and viscosity. By controlling the molecular weight parameter and selecting appropriate polymeric structures with specific functional groups, the invention achieves maximum dispersion stability at minimal viscosity, resolving the direct trade-off between these two parameters
3Reliability
If carboxylic acid groups are neutralized with inorganic base to improve dispersancy, then dispersion improves, but shear thinning increases
Solution Approach 1:
The patent changes the neutralization approach by using organic amines instead of inorganic bases, and controls the degree of neutralization to 20-80% rather than complete neutralization. This parameter modification maintains adequate dispersancy while significantly improving shear thinning resistance, as the partial neutralization preserves some charge density for dispersion while reducing excessive flow sensitivity
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 polymer composition enhances mill base and ink viscosity, stability, and pigment loading, while minimizing shear thinning and clogging, leading to improved performance in inkjet printing and other applications.
Implementation Method 1
reacting the polymer of (1) with a primary hydrocarbyl amine and polyoxyalkylene primary amine (typically polyetheramine)
Data Source
AI summary
The invention relates to a composition containing a polymer obtained by polymerising (1) a mono-vinyl monomer with one or more carboxylic acid groups to form a polymer with at least 2 to 200, or 5 to 150, or 10 to 100, or 15 to 50 repeat units, and (2) reacting the polymer of (1) with a primary hydrocarbyl amine and polyoxyalkylene primary amine (typically polyetheramine). The invention further relates to a composition containing a particulate solid, a liquid medium, and the polymer. The invention further relates to the use of the polymer as a dispersant.