Low-Temperature Hot Melt Adhesive Composition for Packaging
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Solution Overview
Problem
Hot melt adhesive compositions for packaging applications require high application temperatures, leading to irritating fumes, burn risks, and degradation, and existing low-temperature alternatives lack excellent bonding and fast setting times without using expensive maleic anhydride modified components.
Innovation Solution
A hot melt adhesive composition featuring a homogeneous linear ethylene interpolymer, rosin-based and hydrocarbon tackifying agents, paraffin wax, and Fischer-Tropsch wax, applied at temperatures as low as 107°C, with Brookfield viscosities optimized for low application temperatures and excellent bonding under stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If high application temperature (e.g., 177°C) is used to melt the composition and decrease viscosity for proper application and bonding, then the composition can be applied and form a bond to the substrate, but irritating fumes are generated, burn risk increases, and composition degradation occurs
Solution Approach 1:
The patent modifies the chemical composition parameters of the adhesive by incorporating specific low-melting-point waxes (microcrystalline wax, paraffin wax, Fischer-Tropsch wax) and tackifying agents in optimized ratios. This changes the melting and viscosity characteristics of the adhesive, enabling it to flow and bond effectively at lower temperatures (107-121°C) while avoiding the harmful effects associated with high-temperature application
Solution Approach 2:
The patent creates a composite adhesive system combining ethylene-based copolymer, polyester polyol, multiple wax types, and tackifying agents. This composite formulation leverages the complementary properties of each component: the polymer provides structural integrity, the polyester polyol enhances adhesion, the waxes lower melting point and control viscosity, and the tackifying agents ensure rapid bonding. The synergistic interaction enables low-temperature application with excellent bonding performance
2Object-affected harmful factors
If low application temperature (e.g., 107°C) is used to reduce harmful effects, then safety and efficiency improve, but achieving excellent bonding under stress and fast setting time becomes difficult
Solution Approach 1:
The patent carefully adjusts the viscosity parameters of the adhesive at application temperature by controlling the ratio and type of waxes and tackifying agents. The viscosity is optimized to be low enough at 107-121°C to allow proper flow and wetting of substrates, yet high enough after cooling to provide strong bonding under stress. This parameter optimization ensures both safe low-temperature application and reliable bond performance
Solution Approach 2:
The patent utilizes the phase transition properties of the wax components (microcrystalline wax, paraffin wax, Fischer-Tropsch wax) which have melting points in the range of 65-95°C. At application temperature (107-121°C), these waxes are in liquid phase providing low viscosity and good flow. Upon cooling below their melting points, they transition to solid phase, creating a rigid bond structure that maintains strength under stress while achieving fast setting time
3Temperature
If maleic anhydride modified components are used to achieve low application temperature and good bonding, then performance requirements are met, but manufacturing cost increases
Solution Approach 1:
The patent replaces expensive maleic anhydride modified components with more economical alternatives: unmodified ethylene-based copolymer combined with conventional waxes and tackifying agents. This substitution uses readily available, lower-cost materials that achieve the same functional results through proper formulation and ratio optimization, thereby reducing manufacturing cost while meeting performance requirements
Solution Approach 2:
The patent achieves low application temperature without maleic anhydride modification by changing the formulation parameters - specifically by incorporating a blend of waxes (microcrystalline, paraffin, Fischer-Tropsch) and tackifying agents in optimized proportions. This formulation approach lowers the melting point and viscosity of the adhesive through compositional changes rather than chemical modification, avoiding the need for expensive maleic anhydride grafted polymers
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 composition achieves excellent bonding and fast setting times at reduced temperatures, maintaining bond integrity across a wide temperature range without maleic anhydride modified components, enhancing safety and efficiency in packaging applications.
Implementation Method 1
The high temperature is necessary to melt the composition and to decrease the viscosity of the composition to a point where it can be applied
Implementation Method 2
The high temperature is necessary to melt the composition and to decrease the viscosity of the composition
Data Source
AI summary
The invention features a hot melt adhesive composition that can be applied at temperatures as low as 107°C, while maintaining excellent bonding under stress and a very fast setting time.