Polyethylene Laminate Adhesion via Phosphite Additives
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Solution Overview
Problem
High-speed molding of polyethylene laminates with metal or ceramic foils is hindered by weak adhesive strength due to short air gap passing time, leading to neck-in, film breakage, and reduced production efficiency, as existing methods require anchor coat agents or high-temperature aging, which are costly and limited by material constraints.
Innovation Solution
A method involving an ethylene-based polymer composition with a phosphorus-containing compound, such as tris(2,4-di-tert-butylphenyl) phosphite, that directly contacts a base material during extrusion laminating, ensuring high adhesive strength without anchor coat agents, even at high speeds, by optimizing melt flow rate, density, and melt tension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-speed molding is carried out without anchor coat agent, then production efficiency is improved, but adhesive strength remarkably decreases
Solution Approach 1:
The patent changes the chemical composition parameters of the polyethylene by controlling the content of short-chain branches (0.5-5% mol) and incorporating specific additives (metal deactivators, antioxidants) to enable direct adhesion to metal foils without anchor coats at high speeds
Solution Approach 2:
The patent creates a composite resin system by combining polyethylene with controlled branch structure and specific additives (metal deactivators like Irganox MD1010, antioxidants) to achieve both high-speed processability and strong adhesion to metal surfaces
2Strength
If air gap distance is widened, then adhesive strength is improved, but neck-in increases and film width becomes narrow
Solution Approach 1:
The patent optimizes the resin composition parameters (short-chain branch content, additive types) to achieve sufficient adhesion at reduced air gap distances, thereby minimizing neck-in while maintaining strong bonding
3Productivity
If molding speed is increased, then production efficiency is improved, but adhesive strength remarkably decreases
Solution Approach 1:
The patent modifies the polyethylene structure parameters (reducing short-chain branches to 0.5-5% mol) and adds specific additives to enable sufficient oxidation and adhesion even at high molding speeds where air gap passing time is short
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
This method achieves high adhesive strength between polyethylene and base materials, reduces neck-in, suppresses film breakage, and enables high-speed molding with improved production efficiency, while avoiding the use of anchor coat agents and costly ozone treatments.
Implementation Method 1
it is known that with the thickness of the polyethylene being smaller, since the lowering of the temperature of the melted film occurs faster, the sufficient oxidation reaction more hardly occurs and the adhesive strength becomes weaker
Implementation Method 2
a method for producing a laminate including a step of extrusion laminating a resin composition including an ethylene-based polymer composition containing an ethylene-based polymer and a phosphorus-containing compound
Data Source
AI summary
There is provided a laminate having a high adhesive strength between a polyethylene layer and a base material layer without using any anchor coat agent. A method for producing the laminate, including a step of extrusion laminating a resin composition including an ethylene-based polymer composition containing an ethylene-based polymer and a phosphorus-containing compound having a specific structure with a base material so that the resin composition and the base material directly contact each other, wherein the ethylene-based polymer contains at least one of a high-pressure processed low-density polyethylene and a copolymer of ethylene with an α-olefin having 3 to 10 carbon atoms, and the ethylene-based polymer composition satisfies predetermined requirements.