Antioxidant-Integrated Polymer Powder for Pharmaceutical Coatings
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Solution Overview
Problem
There is a need for free-flowing pulverulent film coating compositions with good redispersibility in water that maintain stability during prolonged or thermally demanding storage, without changes in release behavior or discoloration, and that can incorporate sparingly water-soluble antioxidants effectively into pharmaceutical dosage forms.
Innovation Solution
A process involving the radical polymerization of N,N-diethylaminoethyl methacrylate and esters of α,β-ethylenically unsaturated mono- and dicarboxylic acids, where antioxidants are incorporated into an aqueous polymer dispersion and converted to powder form through spray processing with controlled drying gas temperatures, ensuring the antioxidants are evenly distributed and the polymer maintains stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antioxidants are incorporated into aqueous polymer dispersion, then stability during storage is improved, but water solubility of antioxidants is limited
Solution Approach 1:
The patent uses an emulsifier as an intermediary substance to incorporate sparingly water-soluble antioxidants into the aqueous polymer dispersion. The emulsifier acts as a mediator that enables the antioxidant to disperse uniformly in the water-based system despite its limited water solubility, thereby achieving stability during storage without requiring high water solubility of the antioxidant itself.
2Ease of operation
If spray drying is used to convert dispersion to powder, then redispersibility is improved, but particle size control becomes critical
Solution Approach 1:
The patent controls the particle size and redispersibility by optimizing spray drying parameters including inlet temperature (80-150°C), outlet temperature (40-80°C), and atomization pressure (1-5 bar). By adjusting these parameters, the process achieves optimal particle size distribution that ensures good redispersibility while maintaining manufacturing control.
3Productivity
If high drying gas temperature is used, then drying efficiency is improved, but polymer stability may deteriorate
Solution Approach 1:
The patent employs dynamic temperature control in the spray drying process, using high inlet temperatures (80-150°C) for efficient drying while maintaining outlet temperatures (40-80°C) that protect polymer stability. The system dynamically balances drying efficiency and polymer stability through controlled temperature gradients and residence time management.
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 resulting polymer powders exhibit excellent redispersibility, stability, and controlled release properties, with antioxidants effectively integrated into the polymer particles, preventing agglomeration and maintaining performance under stress conditions.
Implementation Method 1
the aqueous dispersion is converted to powder form by spraying processes
Implementation Method 2
A process for producing pulverulent, antioxidant-comprising coating compositions of aqueous polymer dispersions comprising, as component A, a polymer obtained by radical polymerization of
Data Source
AI summary
Described is a process for producing pulverulent, antioxidant-comprising coating compositions, comprising providing an aqueous polymer dispersions comprising one or more antioxidants and a polymer obtained by radical polymerization ofa) N,N-diethylaminoethyl methacrylate, andb) at least one radically polymerizable compound selected from esters of α,β-ethylenically unsaturated mono- and dicarboxylic acids with C1-C8-alkanols,wherein the antioxidants are incorporated into the aqueous polymer dispersion in the form of a solution or of a dispersion, and spray processing the aqueous polymer dispersion to provide a powder form.