Multilayer Structure with Aluminum Phosphide Barrier
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing multilayer structures with aluminum or aluminum oxide gas barrier layers suffer from insufficient transparency and deteriorated barrier performance after retorting, failing to meet demands for high transparency and retort resistance in packaging materials and electronic device protective sheets.
Innovation Solution
A multilayer structure comprising a base and a layer with a reaction product of an aluminum-containing compound and a phosphorus compound, where the reaction product has an average particle diameter of 5 to 70 nm, formed by applying a coating liquid containing these compounds and heat-treating it at 140°C or higher, ensuring high transparency and barrier performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gas barrier layer containing aluminum or aluminum oxide is formed on a plastic film by dry process (PVD or CVD), then gas barrier properties are improved, but transparency is insufficient
Solution Approach 1:
The invention changes the particle size parameter of aluminum oxide from conventional larger sizes to specifically 2000 nm or less, and preferably 100 nm or less. This parameter change enables both high transparency and gas barrier properties to be achieved simultaneously, resolving the contradiction between barrier performance and transparency.
Solution Approach 2:
The invention uses a composite coating liquid containing both aluminum oxide particles and a phosphorus compound. This composite material approach creates a multilayer structure where the fine aluminum oxide particles provide gas barrier properties while the phosphorus compound enhances transparency and adhesion, resolving the contradiction between barrier performance and optical properties.
2Illumination intensity
If a coating liquid containing aluminum oxide particles and phosphorus compound is applied and heat-treated, then transparency is improved, but barrier performance deteriorates after retorting
Solution Approach 1:
The invention optimizes the particle size parameter of aluminum oxide to 2000 nm or less, which maintains structural integrity during retorting while ensuring transparency. This parameter control prevents barrier performance deterioration that occurs with larger particles during high-temperature retorting processes.
Solution Approach 2:
The phosphorus compound acts as an intermediary substance that bonds aluminum oxide particles to the plastic film substrate. This intermediary connection prevents particle detachment and barrier performance degradation during retorting, while maintaining the transparency benefits of fine particles.
3Reliability
If aluminum-deposited films are used for packaging, then gas barrier properties are improved, but light transmittance is blocked
Solution Approach 1:
The invention changes from continuous aluminum deposition to discrete aluminum oxide particles with size 2000 nm or less. This parameter change allows light to pass between particles while gas barrier properties are maintained through the phosphorus compound matrix, resolving the contradiction between gas barrier performance and light transmittance.
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 multilayer structure with excellent gas and water vapor barrier properties, maintaining high transparency and barrier performance even after retorting and damp heat tests, suitable for packaging materials and electronic device protective sheets.
Implementation Method 1
a layer (Y) containing a reaction product (D) of an aluminum-containing compound (A) and a phosphorus compound (B)
Implementation Method 2
heat-treating it at 140°C or higher
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The present invention relates to a multilayer structure including a base (X) and a layer (Y) stacked on the base (X). The layer (Y) contains a reaction product (D) of an aluminum-containing compound (A) and a phosphorus compound (B), and the reaction product (D) has an average particle diameter of 5 to 70 nm.