Solvent-Based Laminating Adhesive for Fast Retort Curing
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Solution Overview
Problem
Existing solvent-based laminating adhesives used in retort applications face challenges with slow curing times and high levels of migrated aromatic species, which hinder compliance with regulatory standards and performance requirements.
Innovation Solution
A solvent-based adhesive composition comprising a blend of aromatic- and aliphatic-based isocyanates with a phosphate ester polyol, which allows for fast curing and low migration of undesirable aromatic amines, meeting stringent regulatory standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If aromatic isocyanate-based adhesives are used for fast curing, then curing speed is improved, but the level of migrated aromatic species increases making them non-compliant with regulatory standards
Solution Approach 1:
The patent uses a composite adhesive system combining aromatic isocyanate (for fast curing) with aliphatic isocyanate and phosphate ester polyol (for low migration and regulatory compliance). This composite approach allows the aromatic component to provide rapid curing while the aliphatic component ensures low levels of migrated aromatic species, resolving the contradiction between curing speed and regulatory compliance
Solution Approach 2:
The patent modifies the chemical composition parameters of the adhesive by incorporating specific ratios of aromatic to aliphatic isocyanates and adding phosphate ester polyol. This parameter change transforms the adhesive properties to achieve both fast curing kinetics and low aromatic migration, simultaneously satisfying speed requirements and regulatory standards
2Object-generated harmful factors
If aliphatic isocyanate-based adhesives are used to meet regulatory standards, then the level of migrated aromatic species is reduced, but curing time increases significantly
Solution Approach 1:
The patent creates a composite adhesive where aliphatic isocyanate provides regulatory compliance with low aromatic migration, while aromatic isocyanate contributes fast curing capability. The synergistic combination eliminates the time penalty associated with using aliphatic isocyanates alone, achieving both compliance and speed
Solution Approach 2:
The phosphate ester polyol acts as an intermediary component that facilitates the curing reaction between aromatic and aliphatic isocyanates. This intermediary enables the system to achieve fast curing rates typically associated with aromatic isocyanates while maintaining the low aromatic migration characteristics of aliphatic isocyanates
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 composition exhibits excellent adhesion performance, fast curing, and low migration of aromatic species, ensuring compliance with retort application requirements and maintaining product quality.
Implementation Method 1
The adhesive composition comprises an isocyanate component and an isocyanate reactive component... The isocyanate component contains a blend of at least one aromatic-based isocyanate with free monomeric isocyanate less than 1 wt. % and at least one aliphatic-based isocyanate... The isocyanate reactive component comprises at least one phosphate ester polyol
Data Source
AI summary
A solvent based retort adhesive comprising at least one isocyanate component comprising a blend of at least one aromatic based isocyanate with free monomeric isocyanate of less than 1 wt. % and at least one aliphatic-based isocyanate, and at least one NCO reactive component comprising a phosphate ester polyol and at least one polyester polyol having a molecular weight of at least 2,000 g/mol is disclosed. A process for producing the adhesive along a laminate partially comprising the adhesive and a process for producing the laminate is also disclosed.