Epoxy Phosphate Esters for Solventless Adhesive Performance
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Solution Overview
Problem
Solventless laminating adhesives have performance disadvantages compared to solvent-borne and water-borne adhesives, particularly in boil-in-bag, chemical aging, and retort performance, and adhesion promoting compounds used to improve performance often shorten the pot life of the adhesive.
Innovation Solution
A composition comprising epoxy phosphate esters, formed by reacting epoxy-terminated polyesters with phosphoric acids, is used in combination with multi-functional isocyanate prepolymers and isocyanate-reactive compounds to enhance the performance of laminating adhesives without significantly shortening the pot life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesion promoting compounds are added to solventless laminating adhesives, then the performance of the laminate is improved, but the pot life of the adhesive is shortened
Solution Approach 1:
The patent modifies the chemical structure of phosphate esters by introducing specific organic groups (R1-R6) and controlling the number of phosphate groups (p=0-3), thereby adjusting the reactivity and adhesion-promoting properties while maintaining acceptable pot life. This structural parameter optimization resolves the contradiction between enhanced laminate performance and extended working time.
Solution Approach 2:
The invention creates a composite adhesive system combining solventless laminating adhesive with specifically designed epoxy phosphate esters. This composite formulation achieves synergistic effects where the phosphate ester provides adhesion promotion without the severe pot life shortening observed with conventional adhesion promoters, thus resolving the performance-pot life contradiction.
2Loss of energy
If solventless laminating adhesives are used, then energy consumption and operational cost are reduced, but performance in boil-in-bag, chemical aging, and retort tests is inferior
Solution Approach 1:
The patent enhances the chemical composition of solventless adhesives by incorporating epoxy phosphate esters with specific molecular structures (formula I). These structural modifications improve the adhesive's resistance to extreme conditions (boil-in-bag, chemical aging, retort) while maintaining the solventless formulation's energy efficiency advantages.
Solution Approach 2:
The invention uses phosphate esters that provide temporary adhesion promotion during the lamination process and extreme condition exposure, after which their function is fulfilled. The adhesive system is designed to achieve maximum performance during critical periods without requiring long-term stability of the additive itself.
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 epoxy phosphate ester composition improves the adhesion and durability of laminates under various performance criteria, including boil-in-bag, chemical aging, and retort tests, while maintaining a suitable pot life for practical application.
Implementation Method 1
A composition comprising one or more epoxy phosphate esters having structure (I)... wherein each PEST has structure (II)... wherein each EPOX has structure (III)... the method comprises reacting one or more epoxy-terminated polyesters with one or more phosphoric acids
Data Source
AI summary
Provided is a composition comprising one or more epoxy phosphate esters wherein the structure comprises two or more polyester linkages. Also provided is a method of making the epoxy phosphate esters that comprises reacting one or more epoxy-terminated polyesters with one or more phosphoric acids. Further provided is an adhesive composition that comprises one or more epoxy phosphate esters, one or more multifunctional isocyanate prepolymers, and one or more multifunctional isocyanate-reactive compounds.