Silicate Glass Composition for Pharmaceutical Packaging
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Solution Overview
Problem
Current glass products for pharmaceutical packaging face challenges in achieving high hydrolytic resistance and mechanical strength while maintaining transparency and avoiding costly raw materials, with aluminosilicate glasses offering poor hydrolytic resistance and borosilicate glasses lacking in mechanical stability and exhibiting color tinges.
Innovation Solution
A silicate glass with a threshold diffusivity of at least 6 μm2/h, hydrolytic resistance class I, and a specific composition that includes Fe2O3 content of at least 0.0012 mol-%, optimized for chemical temperability and low color tinge, using a combination of SiO2, Al2O3, Na2O, K2O, CaO, MgO, and ZrO2 to balance mechanical and chemical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If aluminosilicate glass is used to improve mechanical stability and chemical temperability, then mechanical strength is improved, but hydrolytic resistance deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters by limiting Al2O3 to 0.1-5.0 mol% and B2O3 to 0.0-3.0 mol%, while setting SiO2 at 65.0-80.0 mol%. This parameter optimization resolves the contradiction by creating a glass composition that achieves both high mechanical strength (through controlled alumina content for temperability) and excellent hydrolytic resistance (through high silica content and restricted boron/aluminum that would compromise chemical stability).
Solution Approach 2:
The patent creates a composite glass system combining multiple oxides (SiO2, Al2O3, B2O3, Na2O, K2O, CaO, MgO, ZrO2) in specific proportions. This composite approach allows the glass to simultaneously exhibit mechanical strength from alumina, hydrolytic resistance from silica dominance, and chemical temperability from the balanced oxide composition, resolving the trade-off between mechanical properties and chemical stability.
2Reliability
If borosilicate glass is used to improve hydrolytic resistance, then chemical resistance is improved, but mechanical stability and transparency deteriorate
Solution Approach 1:
The patent optimizes composition parameters by limiting B2O3 to 0.0-3.0 mol% (restricting boron content that provides hydrolytic resistance) while maintaining SiO2 at 65.0-80.0 mol% and Al2O3 at 0.1-5.0 mol%. This parameter balance achieves adequate hydrolytic resistance through controlled boron while prioritizing mechanical stability through high silica and optimized alumina content, preventing the transparency and strength deterioration seen in conventional borosilicate glasses.
3Illumination intensity
If high-purity raw materials are used to reduce color tinge, then transparency is improved, but production cost increases
Solution Approach 1:
The patent sets Fe2O3 content at 0.0012-0.1000 mol% and TiO2 at 0.0012-0.0500 mol%, establishing specific parameter ranges that control coloration. This approach allows the use of cost-effective raw materials with moderate purity levels, as the controlled low levels of iron and titanium oxides suffice to maintain good transparency and color neutrality without requiring expensive high-purity materials.
Solution Approach 2:
The patent applies local quality control by specifically managing trace metal oxide content (Fe2O3, TiO2, ZrO2) that affects color properties. By controlling these specific components at low levels while allowing broader ranges for major oxides, the patent achieves acceptable transparency and color characteristics without the need for uniformly high-purity raw materials across all components, thereby reducing production costs.
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 glass exhibits excellent hydrolytic resistance, mechanical strength, and transparency, allowing for cost-effective production with reduced need for high-purity raw materials, suitable for pharmaceutical packaging without undesirable color impressions.
Implementation Method 1
The ion exchange process works in such a way that, at the glass surface, smaller alkali metal ions, such as for instance sodium and/or lithium ions, are exchanged for larger alkali metal ions, such as potassium ions
Implementation Method 2
Glasses for pharmaceutical packaging such as pharmaceutical containers also require high mechanical stability and durability
Data Source
AI summary
Glasses and glass products suitable for pharmaceutical packaging are provided and methods of making and using such glass and glass products are provided. The glasses combine chemical temperability with very good hydrolytic resistance as well as reduced color tinge. The invention also includes methods for the production of such glasses and their uses.