Multilayer Acrylic Adhesive Crosslinking for Sustainability
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Solution Overview
Problem
Water-borne pressure sensitive adhesives face limitations in adhesive strength and bonding to non-polar substrates, necessitating solutions for enhanced performance and sustainability in industrial applications.
Innovation Solution
A water-borne multilayer pressure sensitive adhesive with a high solid content, featuring an acrylic polymer with reactive groups capable of crosslinking, and a crosslinking agent, which allows for tunable adhesion-cohesion balance and compatibility with both natural fibers and filmic face materials, offering improved adhesive properties and shelf-life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If water-borne pressure sensitive adhesives are used, then environmental sustainability is improved, but adhesive strength deteriorates
Solution Approach 1:
The patent employs a multilayer adhesive structure where at least one layer comprises a water-borne acrylic polymer dispersion with crosslinking capability. This composite approach combines the environmental benefits of water-borne adhesives with enhanced adhesive strength through crosslinked network formation, resolving the contradiction between sustainability and bonding performance.
Solution Approach 2:
The patent utilizes crosslinking agents to fundamentally change the chemical structure and properties of the water-borne adhesive polymer. By introducing crosslinks into the polymer chains, the adhesive achieves improved strength, cohesion, and bonding to non-polar substrates while maintaining its water-borne, environmentally friendly formulation.
2Reliability
If water-borne pressure sensitive adhesives are used, then environmental sustainability is improved, but bonding to non-polar substrates deteriorates
Solution Approach 1:
The multilayer adhesive structure incorporates a water-borne acrylic polymer with crosslinking capability, creating a composite material that bridges the gap between water-based formulation and effective bonding to non-polar substrates through enhanced cohesive strength and surface interaction.
Solution Approach 2:
Crosslinking modifies the physical and chemical parameters of the adhesive, including increased cohesive strength, altered surface properties, and improved compatibility with non-polar substrates, enabling water-borne adhesives to bond effectively to challenging surfaces.
3Use of energy by moving object
If high solid content adhesive is used, then energy efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
The patent employs high solid content water-borne adhesive formulations, changing the concentration parameter to reduce water content and associated drying energy requirements. This approach improves energy efficiency in label manufacturing while the crosslinking mechanism simplifies process control compared to solvent-based systems.
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 multilayer adhesive composition provides enhanced energy efficiency, sustainability, and wide temperature range usability, with adjustable adhesion properties suitable for various applications and excellent water whitening resistance.
Implementation Method 1
at least one acrylic polymer which has a reactive group capable of undergoing a crosslinking reaction, and a crosslinking agent
Data Source
AI summary
The specification relates to an adhesive label comprising a water-borne multilayer pressure sensitive adhesive with enhanced performance. The adhesive label comprises a face layer and a multilayer adhesive adjoined to the face layer. The multilayer adhesive comprises at least two layers of pressure sensitive adhesive. At least one of the at least two layers comprises a pressure sensitive adhesive composition including at least one acrylic polymer which has a reactive group capable of undergoing a crosslinking reaction, and a crosslinking agent. The specification also relates to a labelled item, a label laminate web and a method for manufacturing an adhesive label.