Cellulose-Inorganic Composite Particles for Tablet Compression
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Solution Overview
Problem
Existing composite particles used in pharmaceuticals and other industries face issues with high apparent specific volume, low liquid retention, and tableting problems such as sticking and capping, due to the use of single inorganic compounds, which limit the amount of active ingredient that can be effectively powdered and result in variations in the weight and content of molded articles.
Innovation Solution
The development of composite particles comprising cellulose and an inorganic compound, specifically calcium silicate, with controlled pore size and volume, which enhances liquid retention and compactibility, allowing for higher fluidity and uniformity in molded articles, thereby reducing sticking and capping issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a single inorganic compound is used as an excipient, then the powder can be obtained, but the apparent specific volume is excessively large which limits the amount of active ingredient to be powdered at one time
Solution Approach 1:
The patent uses composite particles formed by co-processing cellulose and inorganic compound (such as calcium carbonate or calcium silicate) to create a material with optimized properties. This composite structure reduces the apparent specific volume compared to using a single inorganic compound, thereby increasing the amount of active ingredient that can be processed at one time while maintaining good flow properties.
2Ease of operation
If a single inorganic compound is used as an excipient, then the powder can be obtained, but handling problems occur such that the inorganic compound scatters
Solution Approach 1:
The composite particles combining cellulose and inorganic compound provide improved handling properties. The cellulose component acts as a binder that reduces scattering of the inorganic compound, making the excipient easier to handle during processing while maintaining its functional properties.
3Strength
If cellulose powder is used as an excipient, then compactibility is good, but once the cellulose powder gets wet, the compactibility is reduced and the function as the excipient is no longer demonstrated
Solution Approach 1:
The composite structure combines cellulose (which provides compactibility) with inorganic compound (which provides stability when wet). The inorganic compound component maintains structural integrity and compactibility even in the presence of moisture, compensating for the cellulose's tendency to lose compactibility when wet.
4Object-generated harmful factors
If a large amount of inorganic compound is added to prevent sticking, then sticking is reduced, but the apparent specific volume increases leading to flushing properties increase and filling properties decrease
Solution Approach 1:
The composite particles provide a balanced formulation where the inorganic compound content is optimized to prevent sticking while the cellulose component maintains appropriate apparent specific volume. This allows sufficient inorganic compound to be present for anti-sticking properties without excessive volume that would cause flushing and poor filling.
5Ease of operation
If the powder has high flushing properties, then fluidity is improved, but filling properties into the die are reduced leading to variation in weight of molded article
Solution Approach 1:
The composite particles achieve a balance between fluidity and filling properties. The combination of cellulose and inorganic compound creates a powder with appropriate flow characteristics for good fluidity while maintaining sufficient density and cohesiveness for consistent die filling, thereby reducing weight variation in molded articles.
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 composite particles demonstrate improved liquid retention, reduced scattering, and enhanced operability, enabling the production of molded articles with uniform active ingredient content and high hardness, while preventing sticking and capping, thus addressing the limitations of single inorganic compounds.
Implementation Method 1
cellulose and an inorganic compound, and having an apparent specific volume of 7 to 13 cm3/g
Implementation Method 2
a tablet is produced by tableting by filling a powder into a die and compressing the powder with a punch
Data Source
AI summary
Provided are composite particles which exhibit excellent fluidity and high liquid retentivity and which exhibit high fluidity even in a liquid-holding state. Also provided are composite particles which permit direct compressing in an open feed manner and which suffer from little compressing trouble and exhibit high shapability. When shaped together with an active ingredient, the composite particles provide shaped bodies which have uniform weight, uniform active ingredient content, and high hardness and which suffer from less galling.