PVA Coating Composition with Polyol Ester and Talc
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Solution Overview
Problem
Existing coating compositions using polyvinyl alcohol (PVA) for oral solid preparations face issues with tackiness, adhesion, and reduced moisture-proof performance, particularly when plasticizers are added to reduce tackiness.
Innovation Solution
A coating composition comprising a PVA polymer, a fatty acid ester of a polyol with 3 or more hydroxy groups, and talc, where the fatty acid ester has a specific HLB value and carbon atom range, and talc is present at 50% by mass or less, forming a coating film with improved moisture-proofness and reduced tackiness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PVA is used as a base material of coating compositions, then moisture-proof performance is improved, but tackiness increases causing adhesion between solid preparations
Solution Approach 1:
The patent changes the chemical composition parameters by introducing a polyol fatty acid ester with specific HLB value (4-20) and carbon atom count (12-22) to modify the coating formulation. This parameter change reduces the tackiness of PVA while preserving its moisture-proof properties, allowing the coating to perform both functions simultaneously.
Solution Approach 2:
The patent creates a composite coating material by combining PVA with a polyol fatty acid ester and talc. This composite formulation leverages the moisture-proof properties of PVA while the polyol fatty acid ester component reduces tackiness, and talc further prevents adhesion, achieving a balance between conflicting properties.
2Object-generated harmful factors
If a plasticizer is added to reduce tackiness of PVA, then adhesion between solid preparations is reduced, but moisture-proof performance deteriorates
Solution Approach 1:
The patent replaces conventional plasticizers with a polyol fatty acid ester having specific HLB values (4-20) and carbon atom counts (12-22). This parameter change allows the material to reduce adhesion effectively while maintaining the moisture-proof performance that would be lost with traditional plasticizers like polyethylene glycol.
Solution Approach 2:
The patent introduces talc as an additional component with specific functionality to locally address the adhesion problem. The talc particles provide a drying, non-tacky surface that prevents adhesion between solid preparations without interfering with the moisture-proof barrier function of the PVA-based coating matrix.
3Productivity
If spray rate is increased to improve productivity, then coating efficiency increases, but adhesion occurs due to tackiness
Solution Approach 1:
The patent applies preliminary anti-action by incorporating the polyol fatty acid ester and talc into the coating composition before the coating process. This pre-formulation approach prevents tackiness and adhesion from occurring during high-speed spraying, allowing increased spray rates and improved productivity without the harmful adhesion effects that would normally limit coating efficiency.
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 provides a highly productive coating with excellent surface smoothness and moisture-proofness, reducing adhesion and increasing coating efficiency, while maintaining practical applicability to common oral solid preparations.
Implementation Method 1
the fatty acid ester of a polyol having 3 or more hydroxy groups (b) has a hydrophilic lipophilic balance (HLB) value of 4.0 or more
Implementation Method 2
the talc (c) is present at 50% by mass or less of the whole composition
Data Source
AI summary
Provided is a novel coating composition for oral solid preparations. The coating composition for oral solid preparations comprises a polyvinyl alcohol-based polymer (a), a fatty acid ester of a polyol having 3 or more hydroxy groups (b), and talc (c), wherein the fatty acid ester of a polyol having 3 or more hydroxy groups (b) has a hydrophilic lipophilic balance (HLB) value of 4.0 or more; wherein the fatty acid ester of a polyol having 3 or more hydroxy groups (b) has 12 to 22 carbon atoms per fatty acid ester unit; and wherein the talc (c) is present at 50% by mass or less of the whole composition.