Bio-based Copolyamide for Sustainable Spectacle Frames
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Solution Overview
Problem
Current transparent amorphous polyamides used in various applications have high mechanical properties but rely on fossil-based materials, which are unsustainable and environmentally detrimental, necessitating the development of polyamides derived from renewable sources.
Innovation Solution
A copolyamide is developed using at least two distinct repeat units, where at least one monomer is derived from renewable sources, ensuring a high content of bioresourced carbon, thereby reducing fossil resource usage and meeting sustainable development criteria, with specific formulations achieving mechanical properties comparable to fossil-based polyamides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyamides are made from fossil-based materials, then mechanical properties and performance are achieved, but environmental sustainability and renewable resource usage deteriorate
Solution Approach 1:
The patent changes the compositional parameter of the polyamide by incorporating bio-based monomers (specifically bio-based adipic acid and/or bio-based diamines) into the polymer structure. This substitution maintains the polyamide's mechanical properties while altering the carbon source from fossil-based to renewable, thereby improving environmental sustainability without sacrificing performance
Solution Approach 2:
The patent creates a composite material system by combining bio-based monomers with traditional polyamide structures. The resulting copolyamide integrates renewable carbon sources into the polymer backbone, forming a hybrid material that preserves the desirable mechanical characteristics of conventional polyamides while incorporating sustainable, bio-based components
2Object-affected harmful factors
If polyamides are made from renewable sources, then environmental sustainability improves, but mechanical properties and performance may deteriorate
Solution Approach 1:
The patent optimizes the concentration parameter of bio-based monomers in the copolyamide structure. By controlling the proportion of bio-based adipic acid and/or diamines within specific ranges, the invention maintains mechanical properties comparable to fossil-based polyamides while maximizing renewable content, thus resolving the trade-off between sustainability and performance
Solution Approach 2:
The patent applies local quality by selectively positioning bio-based monomers within specific segments of the polyamide chain. This allows different regions of the polymer to have optimized properties, maintaining structural integrity and mechanical strength in critical areas while incorporating renewable components in regions that support overall performance and sustainability goals
3Adaptability or versatility
If copolyamides incorporate multiple monomer units, then versatility and application range improve, but manufacturing complexity increases
Solution Approach 1:
The patent segments the polyamide structure into distinct repeat units, each derived from specific monomers (adipic acid, diamines, and optionally other dicarboxylic acids). This segmentation allows independent optimization of each unit's properties while maintaining overall polymer performance, enabling versatility in applications without proportionally increasing manufacturing complexity
Solution Approach 2:
The patent creates a universal copolyamide platform that can serve multiple applications by adjusting the ratio and type of monomers. The same basic copolyamide structure with bio-based components can be tuned for different mechanical properties, transparency requirements, and application-specific performance, reducing the need for entirely different manufacturing processes for each application
Data Source
AI summary
The present invention relates to a copolyamide comprising at least two units and corresponding to the following general formula:A/(diamine)·(Cw diacid),in which:the diamine is a cycloaliphatic diamine,w represents the number of carbon atoms of the diacid,A is chosen from a unit obtained from an amino acid or from a lactam and a unit corresponding to the formula (Cx diamine)·(Cy diacid), with x representing the number of carbon atoms of the diamine and y representing the number of carbon atoms of the diacid,and in which at least one of the monomers chosen from A and the Cw diacid is obtained, in all or part, from renewable starting materials according to Standard ASTM D6866.The invention also relates to a composition comprising this copolyamide and to the use of this copolyamide and of such a composition.