Polymer-Encapsulated Opacifier Dispersion for Stable Aqueous Opacity
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Solution Overview
Problem
Conventional opacifiers used in aqueous personal care compositions face issues with stability, compatibility, and water content, affecting the formulation's functionality and aesthetics, particularly in concentrated detergents or unit dose packets.
Innovation Solution
A composite opacifier dispersion is developed, comprising metal oxide particles encapsulated by a polycaprolactone polymer, with specific size ranges, to provide stable opacification comparable to styrene acrylic copolymers while reducing water content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional mixing methods are used to disperse opacifiers in plastic resins, then the mixing process is simple, but the dispersion is inconsistent and contains agglomerates
Solution Approach 1:
The mixing process is segmented into multiple stages: pre-mixing opacifiers with compatible polymers to create master batches, then incorporating these master batches into the final plastic resin. This multi-stage segmentation allows each stage to optimize for specific dispersion requirements, eliminating agglomerates while maintaining process manageability.
Solution Approach 2:
Opacifiers are pre-dispersed in compatible polymers to create master batches before being incorporated into the final plastic resin. This preliminary action ensures uniform distribution at a smaller scale, preventing agglomerate formation in the final product and achieving consistent dispersion.
2Illumination intensity
If opacifiers are added to plastic resins, then opacity is improved, but yellowing occurs over time
Solution Approach 1:
The patent modifies the chemical composition parameters of the opacifier system by using specific combinations of titanium dioxide, zinc oxide, and zinc sulfide in controlled ratios. These parameter changes optimize both opacity and color stability, preventing yellowing while maintaining effective light scattering properties.
Solution Approach 2:
A composite opacifier system is created using multiple materials (titanium dioxide, zinc oxide, zinc sulfide) in specific combinations. This composite approach balances the high opacity of titanium dioxide with the color stability and UV resistance of zinc oxide and zinc sulfide, achieving both opacity and resistance to yellowing simultaneously.
3Illumination intensity
If titanium dioxide is used as opacifier, then opacity is high, but cost increases
Solution Approach 1:
The patent applies different opacifier materials to different functional requirements: titanium dioxide provides core opacity, while zinc oxide and zinc sulfide address color stability and UV resistance. This local quality assignment optimizes performance while controlling costs by not overusing expensive titanium dioxide beyond what is necessary for opacity.
Solution Approach 2:
The composite opacifier system replaces some expensive titanium dioxide with more cost-effective alternatives like zinc oxide and zinc sulfide while maintaining or improving overall performance. This composite approach reduces material costs through strategic substitution of less expensive materials that provide complementary functions.
4Illumination intensity
If opacifiers are dispersed in plastic resins, then opacity is achieved, but processing difficulties arise
Solution Approach 1:
Opacifiers are pre-dispersed in compatible polymers to create master batches before final compounding. This preliminary dispersion action ensures uniform distribution and reduces processing difficulties in the final product, as the opacifiers are already properly distributed and compatible with the resin matrix.
Solution Approach 2:
Compatible polymers serve as intermediaries between the opacifiers and the final plastic resin. These intermediary materials facilitate proper dispersion and compatibility, reducing processing difficulties by ensuring smooth integration of opacifiers into the final product matrix.
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 composite opacifier dispersion enhances the sustainability and aesthetic appeal of personal care products by maintaining formulation stability and reducing water usage, offering uniform opacity without interfering with other ingredients.
Implementation Method 1
A method for making a dispersion of an opacifier in a plastic resin is provided
Data Source
AI summary
A composite opacifier dispersion is provided, comprising: a dispersion medium; a processing surfactant; and a plurality of composite opacifier particles, wherein the composite opacifier particles comprise metal oxide particles that are partially or completely encapsulated by a polycaprolactone polymer; wherein the metal oxide particles are selected from the group consisting of zinc oxide, titanium oxide and mixtures thereof; wherein the metal oxide particles have a z average particle size of > 100 nm as measured by dynamic light scattering; and wherein the composite opacifier particles have a z average particle size of > 150 nm to 2, 500 nm as measured by dynamic light scattering.