Gelatin Capsule Shell Composition Using GCC Opacifier

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Solution Overview

Problem

There is a need for a light-stable and regulatory-compliant alternative to titanium dioxide as an opacifier in gelatin-based capsule shells, as existing alternatives like precipitated and encapsulated calcium carbonate exhibit poor crosslinking, tensile strength, and light transmittance properties.

Innovation Solution

Utilizing ground calcium carbonate (GCC) as the opacifier in gelatin capsule shells, with specific weight percentages and particle sizes, to enhance crosslinking, tensile strength, and reduce light transmittance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If titanium dioxide is used as opacifier in capsule shells, then light shielding is achieved, but regulatory concerns and restrictive regulations arise

Engineering Contradiction:

Improvelight shieldingVSAvoidregulatory compliance

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent replaces titanium dioxide with ground calcium carbonate (GCC), which is a more readily available, cost-effective, and regulatory-friendly alternative. GCC provides the necessary light shielding function without the regulatory concerns associated with titanium dioxide, effectively substituting a problematic material with a superior one in terms of compliance and availability.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The patent changes the material parameter from titanium dioxide to ground calcium carbonate, altering the chemical composition while maintaining the optical shielding function. This parameter change resolves the regulatory compliance issue while preserving the light-blocking capability through careful selection of GCC particle size and concentration.

Inventive Principle:

Principle #35Parameter changes

2Object-affected harmful factors

If precipitated calcium carbonate (PCC) or encapsulated calcium carbonate (ECC) is used as opacifier, then light shielding is provided, but crosslinking and tensile strength are poor

Engineering Contradiction:

Improvelight shieldingVSAvoidtensile strength

Core Design Contradiction:

Object-affected harmful factorsVSStrength

Solution Approach 1:

The patent changes the physical form parameter of calcium carbonate from precipitated (PCC) or encapsulated (ECC) to ground (GCC). This parameter change in particle morphology and production method results in superior crosslinking behavior and tensile strength while maintaining the light shielding function. The GCC particles interact more effectively with gelatin, creating stronger structural bonds.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite material system combining gelatin with ground calcium carbonate particles. This composite approach leverages the complementary properties of gelatin (flexibility, biocompatibility) and GCC (opacity, structural reinforcement) to achieve both light shielding and enhanced mechanical strength, resolving the contradiction between optical and mechanical requirements.

Inventive Principle:

Principle #40Composite materials

3Strength

If ground calcium carbonate (GCC) is used as opacifier, then tensile strength and light transmittance are improved, but dissolution behavior must be optimized

Engineering Contradiction:

Improvetensile strengthVSAvoiddissolution behavior

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent optimizes parameters including GCC particle size (D50 between 0.2-5 micrometers, preferably 0.5-2 micrometers), concentration (3-12 wt%), and gelatin molecular weight to achieve the desired balance. These parameter adjustments ensure that while GCC provides structural reinforcement and light shielding, the capsule shell maintains appropriate dissolution characteristics for drug delivery.

Inventive Principle:

Principle #35Parameter changes

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

GCC provides better dissolution behavior, higher tensile strength, and lower light transmittance compared to precipitated calcium carbonate (PCC) and encapsulated calcium carbonate (ECC), ensuring effective light shielding and structural integrity of gelatin capsules.

Implementation Method 1

GCC shows lower light transmittance than PCC or ECC when used as opacifier in capsule shells

Methodology Applied

Scientific EffectLight scattering: Scattering

Implementation Method 2

GCC shows lower light transmittance than PCC or ECC when used as opacifier in capsule shells

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Implementation Method 3

GCC shows better behavior with respect to crosslinking, tensile strength and light transmittance in gelatin capsule shells

Methodology Applied

Scientific EffectCrosslinking: Chemical Bonding

Data Source

PatentUS12589076B2Gelatin capsules with ground calcium carbonate

Publication Date: 2026.03.31 CAPSUGEL BELGIUM NV

AI summary

The invention discloses opaque capsule shells made from gelatin with ground CaCO3 as opacifier; and a method for making them.