TiO2-Free Hard Capsule Shell Composition for Opacity and Strength
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Solution Overview
Problem
The use of titanium dioxide as a colorant and opacifier in hard capsule shells is restricted by recent regulations, necessitating an alternative that maintains opacity and mechanical strength while providing a white color.
Innovation Solution
A composition comprising ZnO and CaCO3 is used to replace TiO2, offering a TiO2 free hard capsule shell with improved mechanical properties, light-shielding capacity, and a slight basic pH that inhibits microbial growth, while also providing essential nutrients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If TiO2 is used as white colorant and opacifier in hard capsule shells, then opacity and white color are achieved, but mechanical strength and elasticity deteriorate
Solution Approach 1:
The patent applies composite materials by combining ZnO and CaCO3 in specific ratios (ZnO: 1-20 wt%, CaCO3: 80-99 wt%) to create a composite pigment system that replaces TiO2. This composite approach allows the capsule shell to achieve both opacity and improved mechanical strength, as the combination of these two materials provides synergistic effects that neither material achieves alone.
2Illumination intensity
If TiO2 is used as white colorant in hard capsule shells, then white color and opacity are achieved, but elasticity and elongation at break worsen
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition parameters of the capsule shell, specifically replacing TiO2 with a ZnO-CaCO3 composite system. This compositional parameter change results in improved elasticity and elongation at break while maintaining white color and opacity, demonstrating how changing material parameters can resolve performance trade-offs.
3Illumination intensity
If TiO2 is used as opacifier in hard capsule shells, then light-shielding capacity is achieved, but fragility increases
Solution Approach 1:
The patent uses composite materials (ZnO and CaCO3 combination) to replace TiO2, achieving light-shielding capacity while simultaneously reducing fragility. The composite structure provides better mechanical reliability compared to TiO2 alone, as the materials complement each other's properties.
4Illumination intensity
If suspension with TiO2 is used for capsule shell preparation, then white color is achieved, but viscosity and production energy costs worsen
Solution Approach 1:
The patent applies parameter changes by substituting TiO2 with ZnO-CaCO3 composite in the suspension formulation. This change reduces suspension viscosity and lowers the gelling temperature required during production, thereby reducing energy consumption in the manufacturing process while maintaining the desired white color.
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 ZnO and CaCO3 composition results in a hard capsule shell with higher elongation at break, reduced fragility, and elasticity, along with lower production process energy costs due to lower viscosity and gelling temperature, facilitating easier manufacturing.
Implementation Method 1
ZnO and CaCO3 are in a suitable amount to provide a white color to the film
Implementation Method 2
hard capsule shells having a good light-shielding capacity
Implementation Method 3
suspension for the preparation of a hard capsule shell
Data Source
AI summary
A TiO2 free hard capsule shell including a water-soluble film forming compound selected from the group consisting of a water-soluble cellulose compound and gelatin. The shell optionally contains a gelling agent and/or a gelling aid. The capsule shell further includes ZnO, and CaCO3, wherein ZnO and CaCO3 are in a suitable amount to provide a white color to the film. A TiO2 free suspension for preparing the hard capsule and a capsule product comprising the TiO2 free hard capsule filled with a formulation comprising an active ingredient.