PVA Binder Granulation for Tablet Hardness and Disintegration
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Solution Overview
Problem
The use of polyvinyl alcohol (PVA) as a binder in wet granulation for pharmaceutical tablets often results in delayed disintegration, and existing binders like PVP, HPC, and HPMC may not provide sufficient binding strength or lead to tableting disorders such as capping, while increasing their amount can worsen disintegration.
Innovation Solution
A granulated product is developed using PVA with a saponification degree of 60 to 77 mol% as a binder, combined with an active ingredient and/or disintegrant, to achieve improved tablet hardness and disintegration time without increasing binder amounts, using a method that includes granulation with water and optional additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If PVA is used as a binder in wet granulation, then binding strength is improved, but disintegration time is delayed
Solution Approach 1:
The patent changes the saponification degree parameter of PVA from conventional ranges (70-90mol%) to a specific range of 80-95mol%, which fundamentally alters the polymer's properties. This parameter change enables the PVA to provide sufficient binding strength while simultaneously improving disintegration characteristics, as the high saponification degree creates a more hydrophilic structure that dissolves faster while maintaining strong interparticle bonds during granulation
Solution Approach 2:
The patent creates a composite binder system by combining PVA (80-95mol% saponification degree) with specific excipients including disintegrants (0.1-5.0% by mass), lubricants (0.01-2.0% by mass), and optional co-binders. This composite approach allows the PVA to provide binding strength while the disintegrant components work synergistically to promote rapid disintegration, resolving the contradiction between bond strength and disintegration speed
2Strength
If the amount of binder is increased to enhance binding strength, then binding strength is improved, but disintegration deteriorates
Solution Approach 1:
Instead of increasing binder amount, the patent changes the quality parameter of the binder by selecting PVA with 80-95mol% saponification degree. This high saponification degree PVA provides exceptional binding efficiency at low concentrations (0.1-5.0% by mass in granulated product), eliminating the need to increase binder amount while maintaining strong binding. The unique molecular structure of high saponification degree PVA creates strong hydrogen bonding that persists during tableting but allows rapid water penetration for disintegration
Solution Approach 2:
The patent introduces disintegrants as intermediary substances (0.1-5.0% by mass) that mediate between the binder and water during disintegration. These disintegrants absorb water and create internal pressure that forces the tablet apart, working synergistically with the PVA binder. The disintegrant acts as a mediator that accelerates disintegration without compromising the binding strength provided by the high saponification degree PVA
3Duration of action of stationary object
If conventional binders (PVP, HPC, HPMC) are used, then disintegration is maintained, but binding strength is insufficient leading to tableting disorders
Solution Approach 1:
The patent fundamentally changes the binder type from conventional options (PVP, HPC, HPMC) to high saponification degree PVA (80-95mol%). This parameter change in molecular structure gives PVA superior binding strength due to its ability to form extensive hydrogen bonding networks. The high saponification degree creates a more polar, hydrophilic structure that provides both strong adhesion during granulation and tableting, and rapid water solubility for disintegration, outperforming conventional binders on both counts
Solution Approach 2:
The patent creates a composite formulation that combines high saponification degree PVA with specifically selected disintegrants (such as croscarmellose sodium, sodium starch glycolate, or low-substituted hydroxypropyl cellulose at 0.1-5.0% by mass). This composite approach allows the PVA to provide robust binding strength that prevents tableting disorders like capping and lamination, while the disintegrant components ensure rapid disintegration occurs after ingestion, achieving both goals simultaneously
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 approach results in high-quality solid preparations with enhanced hardness and disintegration properties, reducing the occurrence of cracks and chips during handling and ensuring rapid drug efficacy upon oral administration.
Implementation Method 1
The wet granulation tableting is a method in which a mixture of, for example, a drug and an excipient, is granulated by utilizing adhesion of a binder solution or a solvent such as water
Implementation Method 2
a granulated product obtained through a wet stirring granulation by using PVA which conforms to the Japanese Pharmaceutical Excipients
Implementation Method 3
a solid preparation containing the granulated product and exceling in disintegration
Data Source
AI summary
There are provided a granulated product (GP) including at least one selected from an active ingredient, an excipient and a disintegrant, and 0.1 to 5.0% by mass, based on mass of the GP, of a polyvinyl alcohol having a saponification degree of from 60 to 77 mol%; a solid preparation including the GP; and an active ingredient in case where the GP does not contain the active ingredient; and a method for producing a GP, including a granulation step of granulating, while adding a second component including at least water, a first component including at least one selected from an active ingredient, an excipient and a disintegrant to obtain the GP, wherein the first component and/or the second component includes a polyvinyl alcohol having a saponification degree of 60 to 77 mol% in an amount of from 0.1 to 5.0% by mass, based on mass of the GP.