Virgin Polystyrene Coating on Recycled PET Substrate
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Solution Overview
Problem
Current methods for manufacturing cell culture articles, such as those made from polystyrene, are costly due to the need for thick, mechanically durable materials, and existing methods for forming thinner articles are limited by material properties and high capital costs.
Innovation Solution
A cell culture article with a virgin polystyrene surface coating applied over a less expensive main body material, such as recycled PET, using a polystyrene-containing solution, allowing for cost reduction while maintaining mechanical robustness and suitability for cell growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If thick polystyrene is used to form mechanically durable cell culture articles, then mechanical strength and durability are improved, but material cost increases and manufacturing complexity increases
Solution Approach 1:
The patent applies a thin layer of virgin polystyrene coating (1-100 micrometers) only to the inner surface of the cell culture article that contacts cells, while the outer structure is made from cheaper recycled polymer material. This local application of high-quality material where needed resolves the contradiction by providing mechanical strength and cell compatibility at the interface without requiring thick polystyrene throughout the entire article structure
Solution Approach 2:
The patent creates a composite structure combining virgin polystyrene coating layer with recycled polymer substrate. This composite approach allows the article to exhibit both the mechanical properties and cell compatibility of virgin polystyrene at the surface, while the bulk structure provides structural support at lower cost, resolving the contradiction between strength and manufacturing cost
2Reliability
If virgin polystyrene is used throughout the entire article, then cell growth suitability is improved, but material cost increases
Solution Approach 1:
The patent applies virgin polystyrene coating only to the inner surface (1-100 micrometers thick) that directly contacts cells, while the outer structure uses cheaper recycled material. This local application ensures cell growth suitability at the cell-interface without requiring expensive virgin polystyrene throughout the entire article, resolving the contradiction between reliability and manufacturing cost
Solution Approach 2:
The patent uses a thin coating of virgin polystyrene on a recycled substrate, effectively creating a disposable cell culture article that achieves the necessary cell growth suitability through the thin virgin polymer layer without the expense of using virgin material throughout the entire structure
3Ease of manufacture
If thin polystyrene articles are formed by injection molding, then material cost decreases, but mechanical robustness deteriorates
Solution Approach 1:
The patent uses thin-walled construction (1-100 micrometers) for the inner polystyrene coating layer while the outer recycled polymer structure provides the bulk mechanical strength. This local differentiation allows thin construction where needed for cost savings while maintaining overall mechanical robustness through the composite structure
Solution Approach 2:
The composite structure combines the thin virgin polystyrene coating with a thicker recycled polymer substrate, allowing the article to be thin-walled and cost-effective while the outer structure provides the necessary mechanical robustness that thin injection-molded polystyrene alone cannot achieve
4Ease of manufacture
If recycled polymer material is used for the main body, then material cost decreases, but cell growth suitability deteriorates
Solution Approach 1:
The patent applies a virgin polystyrene coating (1-100 micrometers) to the inner surface of the recycled polymer article, ensuring that the cell-contact surface has the necessary cell growth suitability properties of virgin polystyrene, while the outer recycled structure provides cost-effective structural support
Solution Approach 2:
The virgin polystyrene coating acts as an intermediary layer between the recycled polymer substrate and the cells, mediating the interaction by providing the cell-compatible surface properties that recycled material lacks, while allowing the recycled material to serve as the structural base
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
This approach decreases material costs by 25-50% and provides a surface suitable for cell growth, enhancing mechanical properties and reducing breakage risks during shipping, while also enabling the use of unsuitable materials for cell culture applications.
Implementation Method 1
the polystyrene surface coating is derivable from a polystyrene-containing solution. Example solution compositions include 2-10 wt. % polystyrene dissolved in a ketone or ester solvent, which may be dip-coated, spin-coated, etc. to form the polystyrene coating.
Data Source
AI summary
A cell culture article comprises virgin polystyrene disposed over at least a portion of a surface of an article main body. The article main body may be formed from polyethylene terephthalate (PET) such as reground or recycled polyethylene terephthalate. Methods of making such a cell culture article include applying a composition to a surface of an article main body, where the composition comprises virgin polystyrene having a thickness of 1 to 500 microns and the article main body is formed from glass, ceramic, metal or polymer.