Renewable FDCA Polyester Adhesive for Food Packaging
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Solution Overview
Problem
There is a need for adhesives made from renewable raw materials that possess properties comparable to those of conventional petroleum-based adhesives, particularly for use in the food industry and food packaging, where sustainability in both product and production processes is crucial, and existing solutions do not adequately address the use of sustainable auxiliaries like adhesives.
Innovation Solution
An adhesive comprising a polyester polyol based on furandicarboxylic acid obtained from renewable sources, combined with a compound containing NCO groups, such as polyisocyanates, which is suitable for bonding plastics and metal substrates, and can be formulated to have properties similar to conventional adhesives while being environmentally friendly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If adhesives are made from renewable raw materials, then environmental sustainability is improved, but the availability of suitable chemical compounds is limited
Solution Approach 1:
The patent changes the chemical parameters by using furandicarboxylic acid (FDCA) derived from renewable biomass instead of conventional petroleum-based dicarboxylic acids. This parameter substitution enables the creation of polyester polyols with sustainable origin while maintaining the necessary chemical functionality for adhesive applications.
Solution Approach 2:
The invention creates a composite adhesive system combining polyester polyol derived from renewable FDCA with polyisocyanate compounds. This composite approach allows leveraging the sustainability of bio-based polyol while incorporating the proven performance characteristics of isocyanate crosslinking systems.
2Object-affected harmful factors
If adhesives are made from renewable raw materials, then environmental sustainability is improved, but the physical properties may differ from conventional products
Solution Approach 1:
The patent systematically adjusts key parameters including the NCO:OH ratio (1.05:1 to 2.0:1), viscosity control through polyol selection, and curing conditions to ensure the bio-based adhesive achieves physical properties comparable to conventional petroleum-based adhesives while maintaining food safety standards.
Solution Approach 2:
The invention optimizes specific local properties of the adhesive formulation, such as controlling cyclic ester content through selective polyol synthesis and adjusting the molecular weight distribution of the polyester polyol to achieve desired rheological and bonding characteristics for specific applications.
3Object-affected harmful factors
If furandicarboxylic acid is used from renewable raw materials, then sustainability is improved, but cyclic ester content may increase
Solution Approach 1:
The patent removes or minimizes harmful cyclic ester byproducts through controlled synthesis conditions and selective purification steps during polyester polyol production, ensuring the final adhesive meets food safety requirements while maintaining high sustainability credentials from renewable FDCA.
Solution Approach 2:
The invention converts the potential disadvantage of cyclic ester formation into a benefit by using controlled synthesis conditions that produce cyclic esters as manageable byproducts with defined characteristics, which can be monitored and controlled within safe limits while maintaining the overall sustainability advantage of bio-based FDCA.
4Adaptability or versatility
If adhesive formulation is optimized for food safety, then applicability in food industry is improved, but the range of available compounds is limited
Solution Approach 1:
The patent creates a universal adhesive platform based on polyester polyol from renewable FDCA that can be adapted to multiple food industry applications including packaging, labeling, and sealing. The formulation achieves multi-functionality by meeting food safety standards while providing adequate bonding performance for various substrates.
Solution Approach 2:
The invention adjusts formulation parameters such as NCO content, viscosity, and curing characteristics to optimize performance for specific food industry applications while maintaining compliance with food safety regulations, enabling the same base chemistry to serve multiple purposes.
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 adhesive achieves comparable mechanical and physical properties to conventional adhesives, with a reduced cyclic ester content and lower viscosity, making it suitable for food packaging and film substrates, and allows for reduced adhesive usage without compromising bonding effectiveness.
Implementation Method 1
an adhesive which contains, as components, a polyester polyol based on furandicarboxylic acid and at least one compound containing NCO groups
Data Source
AI summary
The present invention relates to adhesives which contain a polyester polyol on the basis of furandicarboxylic acid obtained from renewable raw materials, and to a method for bonding substrates, in particular film-like substrates, using said adhesive.