Powder Film Coating Composition for Moisture and Odor Barrier
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Solution Overview
Problem
Existing film coating technologies for pharmaceutical and nutraceutical solid dosage forms are either difficult to apply, time-consuming, or increase disintegration time, failing to provide effective moisture, odor, and taste barriers while being costly and requiring specialized equipment.
Innovation Solution
A powder-based film coating composition combining a water-soluble film former with micronized wax as a solid powder hydrophobic compound, optionally including plasticizers and pigments, which can be easily dispersed in water to form a sprayable dispersion for efficient coating without high shear mixers, providing a multifunctional barrier against moisture, odor, and taste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional film coating polymers (shellac, CAP, EC) are used to create moisture barrier coatings, then moisture protection is improved, but organic solvents are required which increase equipment complexity and cost
Solution Approach 1:
The patent changes the solvent parameter from organic to aqueous, enabling the use of water-soluble polymers (HPMC, HPC, MC) instead of conventional organic-soluble polymers. This parameter change eliminates the need for specialized organic solvent handling equipment while maintaining moisture barrier functionality through the hydrophobic character of the cellulose-based polymers.
Solution Approach 2:
The patent employs conventional, readily available aqueous-based coating equipment instead of specialized organic solvent handling equipment. This substitution with simpler, more common equipment reduces capital investment and operational complexity while achieving the same moisture protection function.
2Reliability
If conventional film coating polymers are used to provide moisture barrier, then moisture protection is improved, but disintegration time is prolonged due to reduced aqueous solubility
Solution Approach 1:
The patent creates a composite coating system combining water-soluble cellulose polymers (HPMC, HPC, or MC) with hydrophobic additives (waxes, fatty acids, or oils). This composite structure provides moisture barrier properties through the hydrophobic components while maintaining aqueous solubility and disintegration characteristics through the water-soluble cellulose matrix.
Solution Approach 2:
The patent applies different functional properties to different components of the coating: the cellulose polymer provides water solubility and disintegration capability, while the hydrophobic additives provide localized moisture barrier protection. This local differentiation of functions allows simultaneous achievement of moisture protection and maintained disintegration.
3Reliability
If PVA is used as coating polymer, then moisture barrier properties are maintained, but coating time is doubled due to extreme tackiness requiring slower spray rates
Solution Approach 1:
The patent replaces PVA with cellulose-based polymers (HPMC, HPC, MC) that do not exhibit extreme tackiness. These alternative polymers provide comparable moisture barrier properties without the handling difficulties of PVA, enabling faster spray rates and reduced coating time using standard equipment parameters.
4Reliability
If PVA coating is applied, then moisture barrier is provided, but unpleasant odors are not masked
Solution Approach 1:
The patent combines cellulose polymers with hydrophobic odor-masking agents (waxes, fatty acids, or aromatic compounds) in a single aqueous coating formulation. This composite approach simultaneously achieves moisture barrier protection and odor masking, eliminating the need for separate coating steps required when using PVA alone.
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 solution significantly reduces moisture uptake, effectively masks unpleasant odors, and maintains disintegration times, while being easier and more cost-effective to apply, resulting in a smooth surface and improved patient compliance.
Implementation Method 1
one or more hydrophobic compounds in solid powder form, such as natural wax either from vegetable or animal origin or synthetic wax
Implementation Method 2
Film coating is a well known art. Pharmaceutical solid dosage forms such as tablets, granules, pellets etc are film coated to protect these solid dosage forms from oxidation due to atmospheric oxygen permeation, moisture, heat, light, etc as well as to mask the odor of the pharmaceutical preparations.
Data Source
AI summary
The present invention relates to a film coating composition used for film coating pharmaceutical tablets, nutritional supplements, confectionary forms and the like. The film coating composition comprises a water soluble film former such as hydroxypropylcellulose, hydroxypropylmethylcellulose, hydroxyethylcellulose, starches, modified starches and the like and one or more hydrophobic compounds, such as metal salt of higher fatty acids, higher fatty alcohol natural wax either from vegetable, animal origin or synthetic wax. Optionally, the film coating composition may include plasticizers, colorants, such as pigments and/or flow aids.