Ethylene-α-Olefin Copolymer Adhesive Heat Stability
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Solution Overview
Problem
Adhesives containing conventional ethylene-α-olefin copolymers lack satisfactory heat stability, which affects their performance in high-temperature environments.
Innovation Solution
An adhesive comprising an ethylene-α-olefin copolymer with a specific molecular weight range and density, and a limited number of vinyl-type, vinylidene-type, 2-substituted olefin-type, and 3-substituted olefin-type double bonds, enhancing its heat stability and adhesion properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ethylene-α-olefin copolymer is used as base polymer, then cost is reduced and workability is improved, but heat stability is insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the molecular weight (number-average molecular weight of 5000 to 100000) and density (860 to 970 kg/m³) of the ethylene-α-olefin copolymer, while also limiting the double bond content. These parameter specifications transform the copolymer into an adhesive composition with improved heat stability while maintaining cost-effectiveness compared to traditional EVA adhesives.
2Reliability
If ethylene-α-olefin copolymer with low density is used, then cost is reduced, but heat stability deteriorates
Solution Approach 1:
The patent resolves this contradiction by establishing specific parameter ranges for the copolymer: number-average molecular weight of 5000 to 100000 and density of 860 to 970 kg/m³. Additionally, it limits the double bond content (vinyl-type: less than 0.5, vinylidene-type: less than 0.5, 2-substituted olefin-type: less than 0.5, and 3-substituted olefin-type: less than 0.5 per 1000 carbon atoms). These controlled parameters enable the adhesive to achieve heat stability comparable to or exceeding traditional EVA adhesives while maintaining the cost and density advantages of ethylene-α-olefin copolymers.
Data Source
AI summary
An adhesive with improved heat stability is provided. The adhesive includes an ethylene·α-olefin copolymer (A) having a number-average molecular weight of 5000 to 100000 in terms of polystyrene as measured by gel permeation chromatography and a density of 860 to 970 kg/m3, wherein in the ethylene·α-olefin copolymer (A), the total number of vinyl-type double bond, vinylidene-type double bond, 2-substituted olefin-type double bond and 3-substituted olefin-type double bond is less than 0.5 per 1000 carbon atoms as measured by 1H-NMR.