Modified Titanium Dioxide Pigment with Polycaprolactone Coating
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Solution Overview
Problem
Conventional titanium dioxide pigments require additional finishing steps to improve dispersibility and prevent agglomeration, making them unsuitable for direct use in coating applications, particularly in powder coatings where they often result in poor appearance and durability.
Innovation Solution
A modified encapsulated titanium dioxide is created by mixing crude titanium dioxide with 0.1 to 10 wt% of a polycaprolactone-based (meth)acrylic polymer at high temperatures, resulting in improved dispersibility and enhanced performance in powder coatings without the need for additional dispersants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional titanium dioxide pigments are used without additional finishing steps, then the manufacturing process is simpler, but the dispersibility is poor and agglomeration occurs
Solution Approach 1:
The patent applies preliminary action by incorporating the polycaprolactone-based polymer coating onto the titanium dioxide pigment surface during the manufacturing process itself, rather than requiring separate finishing steps later. This preliminary modification ensures the pigment is pre-equipped with dispersibility-enhancing properties, eliminating the need for additional dispersant additions in end-use applications.
2Reliability
If additional dispersants are added to improve dispersibility, then the dispersibility improves, but the device complexity and processing steps increase
Solution Approach 1:
The patent merges the pigment manufacturing process with the dispersibility enhancement function by integrating the polymer coating step into the core manufacturing workflow. This consolidation combines what would otherwise be separate operations (pigment production and dispersibility treatment) into a unified process, eliminating the need for additional dispersant addition steps in end-use applications.
3Ease of manufacture
If crude titanium dioxide is used directly, then no finishing steps are needed, but the appearance and durability in coatings are poor
Solution Approach 1:
The patent applies parameter changes by modifying the surface chemical parameters of the titanium dioxide pigment through polymer coating. This changes the surface properties (such as surface energy, polarity, and molecular structure) to improve coating appearance, adhesion, and durability, while maintaining a streamlined manufacturing process.
4Manufacturing precision
If polymer coating is applied to improve dispersibility and appearance, then the coating performance improves, but the manufacturing complexity increases
Solution Approach 1:
The patent applies self-service by designing a manufacturing process where the titanium dioxide pigment itself becomes the substrate for polymer coating during its production. The pigment manufacturing system serves dual purposes: producing the pigment particles and simultaneously applying the dispersibility-enhancing polymer coating, thereby improving coating performance without requiring separate external finishing operations.
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 modified titanium dioxide exhibits improved dispersibility, reduced orange peel, lower haze, better flow, and increased adhesion and durability in coatings, allowing for direct incorporation into end-use applications without further processing.
Implementation Method 1
mixing crude titanium dioxide with 0.1 to 10 wt% of at least one (meth)acrylic polymer, preferably a polycaprolactone based polymer, at high temperatures
Data Source
AI summary
The present invention provides a modified encapsulated titanium dioxide comprising an intimate mixture comprising A) crude titanium dioxide, and B) 0.1 to 10 wt% of at least one (meth)acrylic polymer, preferably a polycaprolactone based polymer, the wt% relative to the crude titanium dioxide. The present invention provides a modified titanium dioxide which exhibits improved dispersibility, as well as improved appearance with regard to powder coatings for example, higher DOI (distinctness of image) which relates to reduced orange peel, lower haze and better flow as well as higher adhesion, impact resistance and durability of the coatings. The modified titanium dioxide of the present invention can be incorporated directly in enduse applications without the need for adding additional dispersant(s) to the formulation as is done with conventional pigment.