SiOx Barrier Coating for Break-Resistant Pharmaceutical Packages
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Solution Overview
Problem
Existing pharmaceutical packages, whether glass or plastic, suffer from impermeability issues, breakage, leachables, and dimensional incompatibilities, making them unsuitable for all drugs, especially biologics, requiring a more reliable and cost-effective barrier solution.
Innovation Solution
A thermoplastic vessel with an SiOx composite barrier coating, formed by PECVD, is applied between the wall and lumen, featuring a specific atomic ratio and bonding structure to enhance gas and solute barrier properties, accompanied by a tie and pH protective coating to extend shelf life and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If glass vessels are used for pharmaceutical packaging, then impermeability and chemical inertness are improved, but breakage risk and manufacturing cost increase
Solution Approach 1:
The patent applies a composite barrier coating comprising multiple layers (SiOx barrier layer, tie layer, and pH protective layer) deposited on the plastic vessel wall. This composite structure combines the impermeability of inorganic materials with the flexibility and break resistance of plastic substrates, resolving the contradiction between reliability and strength.
2Strength
If plastic vessels are used for pharmaceutical packaging, then breakage resistance and manufacturing cost are improved, but gas permeability and leaching issues worsen
Solution Approach 1:
The patent uses a thin film composite barrier coating deposited on the flexible plastic vessel wall. The coating provides gas barrier properties comparable to glass while maintaining the flexibility and break resistance of the plastic substrate, thus resolving the contradiction between strength and reliability.
3Ease of manufacture
If conventional coatings are applied to plastic vessels, then manufacturing cost is reduced, but shelf life and stability are insufficient
Solution Approach 1:
The patent employs a multi-layer composite coating structure with specific functions for each layer: SiOx for barrier properties, tie layer for adhesion, and pH protective layer for stability. This composite approach achieves glass-like shelf life extension while maintaining cost-effectiveness through PECVD processing.
4Reliability
If PECVD process is used to form SiOx coating, then gas barrier property is improved, but process complexity and manufacturing cost increase
Solution Approach 1:
The patent optimizes PECVD process parameters including RF power (4-300 W), pressure (1-100 mTorr), and gas flow ratios to achieve the desired SiOx coating properties. By carefully controlling these parameters, the process achieves high barrier performance while managing process complexity through systematic parameter optimization.
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 SiOx composite barrier coating significantly reduces gas permeability and leaching, ensuring a shelf life of over six months for pharmaceutical contents, while maintaining structural integrity and reducing contamination risks.
Implementation Method 1
The SiOx composite barrier coating or layer is formed by PECVD from an organosilicon monomer and an oxidizing gas
Implementation Method 2
The SiOx composite barrier coating or layer is formed by PECVD from an organosilicon monomer and an oxidizing gas
Data Source
AI summary
A vessel including a thermoplastic wall enclosing a lumen is disclosed. The wall supports an SiOx composite barrier coating or layer, for which x is from 1.8 to 2.4, between the wall and the lumen. High Resolution X-ray Photoelectron Spectroscopy (XPS) shows the presence of an interface between the composite barrier coating or layer and the wall or substrate. In one aspect, the interface has at least 1 mol. % O3—Si—C covalent bonding, as a proportion of the O3—Si—C covalent bonding plus SiO4 bonding. In another aspect, the interface has an Si 2p chemical shift to lower binding energy (eV), compared to the binding energy of SiO4 bonding. The result is a tightly adherent composite barrier coating or layer having a high degree of adhesion to the substrate under practical use conditions. Methods of applying the composite barrier coating or layer are also disclosed.