Polyolefin Tie-Layer Adhesive for Metal-to-Substrate Bonding
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Solution Overview
Problem
Existing adhesives for bonding metal layers to dissimilar substrates in multi-layered structures face challenges in providing cost-effective, flexible, and lightweight solutions, as traditional all-metal constructions are expensive and heavy, while fiberglass and wood products can be prone to damage.
Innovation Solution
A polyolefin-based composition comprising a polyolefin grafted with an unsaturated monomer, polyethylene, and polyisobutylenes with different Viscosity Average Molecular Weights, along with optional additives, is used as a tie-layer adhesive to bond metal layers to dissimilar substrates, enhancing adhesion properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional all-metal constructions are used, then strength and durability are improved, but weight and cost increase
Solution Approach 1:
The patent uses composite materials consisting of multiple layers including metal layers, polyolefin layers, and adhesive tie-layers. This composite structure allows the combination of metal's strength with polymer's lightweight properties, achieving both structural integrity and weight reduction. The specific composite structure includes outer/facing layers made from metals, paper, polycarbonates, polyolefins, or polystyrene-based foam, and core/substrate layers made from similar materials, creating a multi-material system that optimizes both strength and weight.
2Ease of manufacture
If fiberglass and wood products are used, then cost and flexibility are improved, but durability deteriorates due to gouging and splintering
Solution Approach 1:
The patent creates composite structures where metal layers provide durability and resistance to gouging and splintering, while polyolefin layers provide cost-effectiveness and flexibility. The adhesive tie-layer ensures reliable bonding between dissimilar materials. This composite approach allows the structure to achieve both the cost and flexibility benefits of alternative materials and the durability of metal constructions.
3Adaptability or versatility
If adhesives are used to bind metal layers to dissimilar substrates, then versatility and adaptability are improved, but adhesion reliability under environmental conditions deteriorates
Solution Approach 1:
The patent uses an adhesive tie-layer as an intermediary substance that bonds dissimilar materials together. This tie-layer is specifically designed to provide reliable adhesion between metal layers and dissimilar substrates. The adhesive layer acts as a mediator that maintains strong bonding across various environmental conditions, including after aging and water exposure, thereby ensuring long-term reliability of the composite structure.
4Strength
If polyolefin-based compositions with multiple polymer components are used, then adhesion strength is improved, but formulation complexity increases
Solution Approach 1:
The patent employs composite polymer formulations consisting of multiple polymer components including polyolefin grafted with unsaturated monomers, polyethylene, and polyisobutylene with different molecular weights. This composite polymer system enhances adhesion strength by combining the beneficial properties of different polymers. The formulation includes specific ratios of these components and incorporates additives to optimize performance, achieving strong adhesion while managing formulation complexity through systematic composition design.
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 polyolefin-based composition achieves strong adhesion to metal layers, maintaining performance across various environmental conditions, including after aging and water exposure, making it suitable for applications in building, automotive, and other industries.
Implementation Method 1
a polyolefin-based composition made from or containing (A) a first polymer composition made from or containing a polyolefin grafted with an unsaturated monomer
Implementation Method 2
a third polymer composition made from or containing (i) a first polyisobutylene and (ii) a second polyisobutylene. The first polyisobutylene has a Viscosity Average Molecular Weight (VAMW 1 ), and the second polyisobutylene has a Viscosity Average Molecular Weight (VAMW 2 ), wherein VAMW 1 ≠ VAMW 2
Data Source
AI summary
A polyolefin-based composition made from or containing (A) a first polymer composition made from or containing a polyolefin grafted with an unsaturated monomer, (B) a second polymer composition made from or containing a polyethylene, and (C) a third polymer composition made from or containing (i) a first polyisobutylene and (ii) a second polyisobutylene. The first polyisobutylene has a Viscosity Average Molecular Weight (VAMWi), and the second polyisobutylene has a Viscosity Average Molecular Weight (VAMW2), wherein VAMWi ≠ VAMW2. The polyolefin-based composition is useful as an adhesives or a tie-layer adhesive composition for multi-layered structures. In particular, the composition is useful as an adhesive to bind a metal layer to a dissimilar substrate.