Polyolefin Medical Container Composition for Retort Sealing
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Solution Overview
Problem
Current medical container materials, such as those made from chlorinated polymers, face challenges with biocompatibility, flexibility, transparency, weldability, and barrier properties, and existing polyolefin-based solutions often have limited sealing temperature windows, poor weld strength, and insufficient heat stability, making them unsuitable for retortable and flexible medical applications.
Innovation Solution
A polyolefin composition comprising a mixture of propylene/[alpha]-olefin copolymers with distinct melting areas and propylene homopolymers, allowing for broad temperature range sealing and welding, high impact resistance, and transparency, while being free from migrating substances, thus suitable for medical and pharmaceutical applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If chlorinated polymers (PVC) are used for medical containers, then flexibility and ease of manufacture are improved, but biocompatibility and safety deteriorate due to migration of stabilizers and plasticizers
Solution Approach 1:
The patent removes harmful chlorinated polymers and their additives (stabilizers, plasticizers) from the container structure, replacing them with a polyolefin-based composition that inherently provides flexibility without requiring migrating additives, thus eliminating the biocompatibility hazard while maintaining operational flexibility
Solution Approach 2:
The patent changes the material composition parameters by using a specific polyolefin blend with controlled elastomer content (5-20 wt%) and copolymer composition, achieving the desired flexibility through compositional parameters rather than through migrating additives, thereby improving biocompatibility
2Strength
If polypropylene with elastomers (SEBS, SVIS, SIBS) is used to improve transparency and impact strength, then mechanical properties are improved, but sealing temperature window and weldability deteriorate
Solution Approach 1:
The patent optimizes the compositional parameters by controlling the elastomer content within 5-20 wt% and selecting specific copolymer types with appropriate melting points, which adjusts the sealing temperature window and improves weldability while maintaining impact strength, resolving the manufacturing difficulty
Solution Approach 2:
The patent creates a composite material system combining polypropylene with specific elastomers and copolymers in controlled ratios, where the synergistic interaction between components provides both improved mechanical properties and enhanced weldability, overcoming the limitations of single-component systems
3Stability of the object's composition
If high shear rate compounding is used to mix rubber and polyolefins, then compatibility is improved, but composition stability deteriorates due to vulnerability to degradation
Solution Approach 1:
The patent changes the processing parameters by using alternative compounding methods that avoid excessive shear rates, while maintaining compatibility through controlled mixing conditions and optimized compositional parameters, thus preventing degradation and ensuring composition stability
4Ease of manufacture
If pure COP is used in multilayer structures, then manufacturing is simplified, but weld strength and flexibility deteriorate after retort treatment
Solution Approach 1:
The patent replaces pure COP with a composite polyolefin composition containing multiple components (polypropylene, elastomers, copolymers) that work synergistically to provide both manufacturing ease and maintained weld strength after retort, overcoming the limitations of single-component COP structures
Solution Approach 2:
The patent adjusts the compositional parameters of the polyolefin blend to optimize the balance between manufacturing simplicity and post-retort performance, ensuring that weld strength and flexibility are maintained through controlled composition rather than through complex multilayer structures
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 composition provides excellent sealing and welding properties, maintaining flexibility and impact strength even after retort treatment, ensuring the containers are retortable, flexible, and capable of forming strong permanent and peelable seals over a broad temperature range, meeting stringent medical application requirements.
Implementation Method 1
the propylene/[alpha]-olefin copolymer (A) has at least one distinct DSC melting area between 30 and 110°C
Implementation Method 2
maintaining flexibility and impact strength even after retort treatment
Data Source
AI summary
Retortable, flexible essentially polyolefin composition, mono- or multi- layer structures including at least one layer comprising such a composition, containers made from such structures and specific applications thereof.