Metallocene Hot-Melt Adhesive for Clean Jetting and Heat Resistance
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Solution Overview
Problem
Existing hot-melt adhesives face issues with thread formation during application, insufficient thermal resistance, and reduced adhesive strength at high temperatures, particularly in paper processing and woodworking applications.
Innovation Solution
A hot-melt adhesive composition comprising a metallocene-type propylene/ethylene copolymer, ethylene/carboxylate ester copolymer, tackifying resin, and wax, optimized in specific ratios to enhance thermal stability and reduce thread formation, ensuring excellent adhesiveness across a wide temperature range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If ethylene-based copolymer is used as base polymer to achieve good application properties, then thread formation occurs during jetting, but adhesiveness at high temperatures deteriorates
Solution Approach 1:
The patent uses a composite polymer system combining polyethylene (30-70 parts) with ethylene-vinyl acetate copolymer (10-40 parts) and ethylene-acrylic acid copolymer (5-20 parts). This composite approach allows the polyethylene base to provide thermal resistance while the copolymers contribute to application properties and reduce thread formation, achieving both high-temperature adhesiveness and easy application.
2Productivity
If hot-melt adhesive is heated to high temperature for application, then bonding speed increases, but thread formation increases and smears around nozzle
Solution Approach 1:
The patent optimizes the composition parameters of the hot-melt adhesive by controlling the ratios of polyethylene, ethylene-vinyl acetate copolymer, and ethylene-acrylic acid copolymer. This parameter optimization allows the adhesive to maintain appropriate viscosity and flow characteristics at application temperatures, enabling high-speed bonding while minimizing thread formation and smearing around the nozzle.
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 exhibits improved low-temperature application, high-speed setting, and maintains strong adhesion in extreme temperatures, preventing thread formation and ensuring durability in paper products like cardboard packaging containers and cartons.
Implementation Method 1
the hot-melt adhesive is heated to about 120 to 190° C., and discharged from a tip of the nozzle
Implementation Method 2
it is heated, melted and applied to an adherend, and then, solidified by being cooled to develop adhesiveness
Data Source
AI summary
A hot-melt adhesive having reduced thread formation at the time of applying, excellent thermal resistance and thermal stability after bonding. A hot-melt adhesive comprising a copolymer of ethylene and olefins having 3 to 20 carbon atoms (A), a copolymer of ethylene and carboxylate esters having ethylenically unsaturated double bonds (B), a tackifying resin (C) and a wax (D), wherein the copolymer of ethylene and at least one olefin monomer having 3 to 20 carbon atoms (A) comprises a metallocene-type propylene/ethylene copolymer (A1).