Functionalized Ethylene Interpolymer Adhesive Formulation
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Solution Overview
Problem
There is a need for solvent-free, low viscosity, hot melt adhesive (HMA) and pressure sensitive adhesive (PSA) formulations that maintain adhesive strength at high use temperatures and are cost-effective and safe to produce, as current high-performance PSAs based on high molecular weight styrene block copolymers require solvents and reactive hot melts using isocyanate chemistry pose safety issues.
Innovation Solution
A composition comprising at least one functionalized ethylene interpolymer and at least one functionalized propylene interpolymer, where the functionalized ethylene interpolymer has a melt viscosity less than 50,000 cP at 177°C, formed from an ethylene/alpha-olefin copolymer with alpha-olefins like propylene, 1-butene, or 1-octene, which introduces functionality for enhanced compatibility and adhesion properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high molecular weight styrene block copolymers are used to create high-performance pressure sensitive adhesives, then adhesive strength is improved, but the formulation requires solvents which increases complexity and cost
Solution Approach 1:
The patent changes the molecular weight parameter of the base polymer from high molecular weight (in prior art) to low molecular weight (1,000-100,000 g/mol), which inherently reduces viscosity and eliminates the need for solvents while maintaining adhesive performance through functionalization
Solution Approach 2:
The patent creates a composite adhesive system combining low molecular weight base polymer with grafted functional groups (carboxylic acid, hydroxyl, amine, or isocyanate), achieving both low viscosity and high adhesive strength without requiring solvent additives
2Strength
If reactive hot melts using isocyanate chemistry are used, then adhesive performance is improved, but safety issues arise during production
Solution Approach 1:
The patent replaces stable but hazardous isocyanate chemistry with less hazardous alternative functional groups (carboxylic acid, hydroxyl, amine) that achieve similar adhesive performance without the safety risks, effectively substituting a dangerous material with safer alternatives
Solution Approach 2:
The patent converts the potential harm of isocyanate reactivity into benefit by using controlled grafting of alternative functional groups that provide comparable reactive adhesion without the hazardous handling requirements, turning a safety risk into a safer design
3Strength
If functional groups are introduced to enhance adhesion properties, then adhesive strength is improved, but melt viscosity increases
Solution Approach 1:
The patent changes the fundamental parameter of base polymer molecular weight to low levels, creating sufficient free volume and chain mobility that accommodates functional group grafting without significant viscosity increase, unlike high molecular weight systems where grafting severely limits processability
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 solution provides adhesive formulations with improved paintability, toughness, compatibilization, impact resistance, and flexibility, suitable for various applications including case and carton sealing, automotive, graphic arts, and woodworking, while being solvent-free and cost-effective.
Implementation Method 1
A composition comprising at least one functionalized ethylene interpolymer and at least one functionalized propylene interpolymer... which introduces functionality for enhanced compatibility and adhesion properties
Data Source
Figure 1
AI summary
A composition comprising at least one functionalized ethylene interpolymer and at least one functionalized propylene interpolymer, and wherein the at least one functionalized ethylene interpolymer has a melt viscosity less than 50,000 cP at 350°F (177°C).