Opaque Capsule Composition Balancing Light Shielding and Strength
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Solution Overview
Problem
Existing capsule formulations struggle to achieve both good light-shielding capacity and mechanical strength, as alternatives to titanium dioxide (TiO2) like calcium carbonate (CaCO3) have not been successfully integrated to provide sufficient opacity and mechanical stability when incorporated within the capsule formulation.
Innovation Solution
A hard shell capsule composition is developed using a film-forming agent like gelatin, pullulan, or cellulose-based polymers, combined with precipitated calcium carbonate (8-10 wt%) to create opaque capsules with reduced light transmittance, employing a dip coating process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If calcium carbonate is incorporated in the capsule formulation to create opacity, then light-shielding capacity is improved, but mechanical strength deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the concentration of calcium carbonate within a specific range (3-10 wt%, preferably 4-8 wt%, more preferably 5-7 wt%) and controlling particle size parameters (D50 between 0.2-2.0 μm, D4,3 about 10 μm or less). These parameter optimizations enable the capsule to achieve both good opacity (light transmittance 35% or lower at 650 nm) and acceptable mechanical strength, resolving the contradiction between light-shielding capacity and mechanical strength
Solution Approach 2:
The patent creates a composite capsule formulation by combining calcium carbonate particles with film-forming agents (gelatin, polysaccharides, modified starches, cellulose derivatives, or synthetic polymers). This composite structure allows the calcium carbonate to provide light-shielding properties while the polymer matrix maintains mechanical integrity, effectively resolving the contradiction between opacity and mechanical strength
2Object-affected harmful factors
If titanium dioxide is used as opacifier to achieve good light blocking, then opacity is improved, but alternative materials are needed due to continuous search for new products
Solution Approach 1:
The patent replaces titanium dioxide, a well-established but expensive opacifier, with calcium carbonate, which is a cheaper, more readily available material. By optimizing the concentration and particle size of calcium carbonate, the patent achieves comparable light-blocking properties (light transmittance 35% or lower at 650 nm) at lower cost, enabling product replacement while maintaining performance
Solution Approach 2:
The patent applies parameter changes by carefully controlling calcium carbonate concentration (3-10 wt%) and particle size (D50 between 0.2-2.0 μm, D4,3 about 10 μm or less) to achieve light-blocking properties comparable to titanium dioxide. This parameter optimization enables calcium carbonate to serve as a viable alternative to the well-known TiO2 opacifier
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 composition achieves a balance between opacity and mechanical strength, providing capsules with an opacity coefficient of 20% or higher and light transmittance at 650 nm of 35% or lower, suitable for protecting light-sensitive ingredients.
Implementation Method 1
the opacity of the capsule hence regulates the light-shielding... calcium carbonate (CaCO3), when present in a specific concentration range provided the best balance between good opacity and good mechanical properties
Data Source
Figure 1A~1B
AI summary
The present invention provides ingestible dosage form articles such as opaque capsules with reduced light transmittance.