Siloxane Copolymer Protective Layer for Flexible Barrier Laminates
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Solution Overview
Problem
Conventional moisture and oxygen barrier laminates face a trade-off between durability and flexibility, deteriorating when subjected to deformation such as bending due to separation or cracking between layers.
Innovation Solution
A laminate structure comprising an inorganic barrier layer and a protective layer formed on a transparent substrate, where the protective layer includes an organic copolymer with a repeating unit derived from a siloxane compound, enhancing both barrier properties and interlayer adhesion to improve durability and flexibility simultaneously.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a barrier laminate uses an inorganic thin film on a plastic substrate, then barrier properties are achieved, but durability and flexibility deteriorate due to separation or cracking between layers during deformation
Solution Approach 1:
The patent introduces a primer layer as an intermediary between the plastic substrate and the inorganic thin film. This primer layer serves as a mediator that improves adhesion between the two layers, preventing separation and cracking during deformation while maintaining the barrier properties of the inorganic film.
Solution Approach 2:
The patent creates a composite structure by laminating a polymer coating layer onto the inorganic thin film. This composite material approach combines the barrier properties of the inorganic film with the flexibility and durability of the polymer coating, resolving the contradiction between these properties.
2Strength
If durability is improved by adding primer layers or polymer coating layers, then interlayer adhesion enhances, but flexibility deteriorates due to increased layer complexity and rigidity
Solution Approach 1:
The patent modifies the chemical composition parameters of the polymer coating layer by selecting specific polymers with appropriate glass transition temperatures and molecular weights. This parameter optimization allows the coating to provide strong interlayer adhesion while maintaining flexibility through careful selection of polymer properties rather than increasing layer thickness or complexity.
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 laminate maintains excellent interlayer adhesion and barrier properties even under deformation, such as bending, thereby providing improved durability and flexibility, as demonstrated by the Gelbo flex test results.
Implementation Method 1
the protective layer comprises an organic copolymer containing a repeating unit derived from a siloxane compound
Implementation Method 2
the barrier properties are deteriorated due to separation or cracking between layers
Data Source
AI summary
The present invention relates to a moisture and oxygen barrier laminate with improved durability and flexibility. According to the present invention, there is provided a laminate, comprising: an inorganic barrier layer and a protective layer sequentially formed on one surface of a transparent substrate, wherein the protective layer includes an organic copolymer containing a repeating unit derived from a siloxane compound. The laminate according to the present invention can maintain excellent interlayer adhesion even when deformation such as bending is applied, thereby exhibiting excellent moisture and oxygen barrier properties.