Treated TiO2 Pigment Opacity in Decor Paper
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Solution Overview
Problem
Highly loaded paper systems require high concentrations of titanium dioxide (TiO2) to achieve desired opacity, but the 'crowding effect' leads to reduced opacifying efficiency, resulting in increased costs for décor paper manufacturers.
Innovation Solution
A dispersion comprising a treated TiO2 pigment with a surface area of at least 30 m2/g, coated with silicon, aluminum, or phosphorus oxides, and a cationic polymer, which reduces the amount of TiO2 needed by about 10% while maintaining optical performance without compromising mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high concentrations of TiO2 are used to achieve desired opacity in highly loaded paper systems, then opacity is improved, but the crowding effect reduces opacifying efficiency and increases costs
Solution Approach 1:
The patent applies parameter changes by modifying the surface area of TiO2 particles (using particles with at least 30 m2/g surface area) and applying oxide treatments (silicon, aluminum, or phosphorus oxides at least 15% by weight) to enhance the opacifying efficiency per unit of pigment, thereby reducing the total quantity of TiO2 needed while maintaining desired opacity levels
Solution Approach 2:
The patent creates a composite material system by combining TiO2 pigment particles with oxide treatments (silicon, aluminum, or phosphorus oxides) and cationic polymers to form a multi-component pigment composition that achieves superior opacifying efficiency compared to untreated TiO2, reducing the overall pigment loading required
2Illumination intensity
If high concentrations of TiO2 are used to maintain opacifying efficiency, then opacity is maintained, but mechanical strength is compromised
Solution Approach 1:
The patent changes the parameters of the pigment system by using high surface area TiO2 particles (at least 30 m2/g) with oxide treatments, which provide equivalent or superior opacity at lower concentrations, thereby preserving the fiber network integrity and maintaining mechanical strength that would otherwise be compromised by high pigment loading
Solution Approach 2:
The oxide treatments (silicon, aluminum, or phosphorus oxides) create a surface layer on the TiO2 particles that copies or enhances the light-scattering properties while reducing the bulk pigment concentration needed, allowing maintenance of optical performance with reduced impact on mechanical properties
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 treated TiO2 pigment maintains opacifying efficiency at lower concentrations, reducing costs and preserving mechanical strength in décor paper and paper laminates.
Implementation Method 1
TiO2 concentrations of 30-45% by weight of pigment are needed to provide the desired color and or opacity
Implementation Method 2
the efficiency at which TiO2 functions as an opacifying agent deteriorates due to the 'crowding effect' of the pigment
Implementation Method 3
a cationic polymer; wherein the treatment comprises an oxide of silicon, aluminum, phosphorus or mixtures thereof
Data Source
AI summary
The disclosure provides a paper laminate comprising a décor paper prepared from a dispersion having improved optical performance without negatively impacting mechanical strength, wherein the dispersion comprises a TiO2 particle slurry comprising a treated TiO2 particle having a surface area of at least about 30 m2/g, and a cationic polymer; wherein the treatment comprises an oxide of silicon, aluminum, phosphorus or mixtures thereof; and the treatment is present in the amount of at least 15% based on the total weight of the treated titanium dioxide particle; paper pulp; and a cationic polymer; wherein the cationic polymer in the slurry and the cationic polymer in the dispersion are compatible; wherein for equal optical performance, the amount of treated TiO2 particle in the dispersion is reduced by about 10% when compared to a dispersion not comprising the treated TiO2 particle of (a).