Laminate Adhesive Strength via Intermediary Copolymer Layer
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Solution Overview
Problem
Existing laminated hose structures face challenges in achieving strong adhesive strength between ethylene/α-olefin/non-conjugated polyene copolymers and saponified ethylene/vinyl acetate copolymers, while maintaining gas barrier properties and ozone, weather, and heat resistance.
Innovation Solution
A laminate comprising a layer of ethylene/α-olefin/non-conjugated polyene copolymer with additives such as dicumyl peroxide, metal oxides, and hydrophilic fumed silica, combined with a layer of saponified ethylene/vinyl acetate copolymer, to enhance adhesive strength and gas barrier properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a layer of ethylene/α-olefin/non-conjugated polyene copolymer is laminated with a layer of saponified ethylene/vinyl acetate copolymer, then gas barrier property is improved, but adhesive strength between layers deteriorates
Solution Approach 1:
The patent introduces an intermediate layer containing a specific copolymer composition (ethylene/α-olefin/non-conjugated polyene copolymer with 10-40 parts by mass of vinyl acetate) between the saponified ethylene/vinyl acetate copolymer layer and the ethylene/α-olefin/non-conjugated polyene copolymer layer. This intermediate layer acts as a mediator that provides both gas barrier properties and sufficient adhesiveness to the ethylene/α-olefin/non-conjugated polyene copolymer layer, resolving the contradiction between gas barrier performance and adhesive strength.
2Reliability
If ethylene/α-olefin/non-conjugated polyene copolymer is used for its ozone and weather resistance, then durability is improved, but adhesive strength with saponified ethylene/vinyl acetate copolymer deteriorates
Solution Approach 1:
The patent applies local quality by creating a multi-layer structure where each layer has distinct properties optimized for its specific function. The outer layer maintains the ethylene/α-olefin/non-conjugated polyene copolymer for ozone and weather resistance, while the intermediate layer contains a copolymer composition specifically designed to provide adhesive strength to this layer. This localized functional differentiation resolves the contradiction between durability and adhesive strength.
3Reliability
If thermoplastic elastomer layer is laminated with saponified ethylene/vinyl acetate copolymer layer, then gas barrier property is achieved, but adhesiveness between layers deteriorates due to nonpolar nature of thermoplastic elastomer
Solution Approach 1:
The patent introduces an intermediate layer with specific copolymer composition that acts as a mediator between the polar saponified ethylene/vinyl acetate copolymer and the nonpolar thermoplastic elastomer. This intermediate layer contains copolymers with balanced polarity and specific compositional ratios (10-40 parts vinyl acetate per 100 parts ethylene) that enable adequate adhesiveness to both layers while maintaining gas barrier properties, thus resolving the adhesion problem caused by polarity mismatch.
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 solution provides a laminate with improved adhesive strength between the ethylene/α-olefin/non-conjugated polyene copolymer and the saponified ethylene/vinyl acetate copolymer, maintaining excellent gas barrier properties and resistance to ozone, weather, and heat.
Implementation Method 1
a layer of a copolymer composition comprising 100 parts by mass of an ethylene/α-olefin/non-conjugated polyene copolymer (A) and 1.7 to 20 parts by mass of dicumyl peroxide and 2 to 20 parts by mass of a metal oxide
Implementation Method 2
20 to 120 parts by mass of a hydrophilic fumed silica
Implementation Method 3
a layer of a saponified ethylene/vinyl acetate copolymer (B)
Data Source
AI summary
The present invention has an object of providing an ethylene/α-olefin/non-conjugated polyene copolymer composition excellent in the adhesive strength with a layer of a saponified ethylene/vinyl acetate copolymer; and the present invention relates to a laminate comprising a layer of a copolymer composition comprising 100 parts by mass of an ethylene/α-olefin/non-conjugated polyene copolymer (A) and one or more additives selected from the following (1) to (3), and a layer of the saponified ethylene/vinyl acetate copolymer (B). (1) 1.7 to 20 parts by mass of dicumyl peroxide and 2 to 20 parts by mass of a metal oxide; (2) 20 to 120 parts by mass of a hydrophilic fumed silica; and (3) 5 to 50 parts by mass of an ethylene/vinyl acetate copolymer (B) .