Gas-Barrier Coating Composition for Adhesive Barrier Laminates
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Solution Overview
Problem
Existing gas-barrier laminates are unsatisfactory in terms of oxygen-barrier and water vapor-barrier properties, and are not stable against acids and alkalis, despite attempts to improve adhesion with resins.
Innovation Solution
A gas-barrier coating composition containing a metal oxide, a phosphoric acid compound, and an amine compound, specifically zirconium oxide, orthophosphoric acid, and polyallylamine, forming a film with a homogeneously crosslinked structure that enhances oxygen and water vapor barrier properties, and includes an anchor layer for improved adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gas-barrier film containing metal atoms and phosphorus atoms is formed on a plastic base material, then oxygen-barrier and water vapor-barrier properties are improved, but adhesion to the substrate deteriorates
Solution Approach 1:
The patent introduces a resin as an intermediary substance between the metal oxide-phosphoric acid compound coating and the plastic base material. This resin layer serves as a mediator that bonds to both the inorganic coating and the organic plastic substrate, resolving the adhesion problem while preserving the barrier properties of the metal oxide-phosphorus system
2Strength
If resin is added to improve adhesion of the coating to the substrate, then adhesion is improved, but oxygen-barrier and water vapor-barrier properties deteriorate
Solution Approach 1:
The patent applies the resin component locally at the interface between the coating and substrate, rather than throughout the entire barrier layer. This localized application allows the resin to fulfill its adhesion function at the bonding interface while minimizing its impact on the overall barrier properties of the metal oxide-phosphoric acid compound layer
3Reliability
If aluminum is used as the main metal component in the gas-barrier film, then oxygen-barrier and water vapor-barrier properties are improved, but stability against acid and alkali deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the metal oxide component, specifically replacing or supplementing aluminum oxide with zinc oxide and/or magnesium oxide. This parameter change maintains the barrier functionality while providing superior chemical stability against acids and alkalis, as zinc and magnesium oxides exhibit better resistance to chemical corrosion
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 composition forms a film with excellent oxygen and water vapor barrier properties, remaining stable against acids and alkalis, and exhibits improved adhesion, suitable for both non-retort and retort sterilization applications.
Implementation Method 1
forming a film with a homogeneously crosslinked structure that enhances oxygen and water vapor barrier properties
Implementation Method 2
a gas-barrier coating composition containing a metal oxide, a phosphoric acid compound, and an amine compound... capable of forming a film thereof... excellent oxygen-barrier properties and moisture-barrier properties
Data Source
AI summary
The present invention relates to a gas-barrier coating composition containing a metal oxide, a phosphoric acid compound, and an amine compound. The present invention provides a gas-barrier film that features excellent oxygen-barrier property, excellent water vapor-barrier property as well as excellent transparency, and a gas-barrier laminate that includes the film.