Adhesive Sheet Barrier Layer for Softener Migration Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Hot-melt pressure sensitive adhesive sheets experience discoloration and deformation of the base material due to migration of softeners, particularly when using polyolefin-based resins, which is not effectively addressed by existing technologies.
Innovation Solution
Incorporating a barrier layer composed of polyester-based, polyurethane-based, or polyolefin-based resin between the base material and the hot-melt pressure sensitive adhesive layer to prevent softener migration, with specific glass transition temperatures and thicknesses to enhance adhesion and suppress deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a hot-melt pressure sensitive adhesive layer containing softener is formed on a base material, then coatability and low-temperature pressure sensitive adhesion are improved, but discoloration and deformation of the base material occur due to softener migration
Solution Approach 1:
A barrier layer is introduced as an intermediary component between the base material and the hot-melt pressure sensitive adhesive layer. This barrier layer contains specific resins (polyester-based, polyurethane-based, or polyolefin-based with controlled glass transition temperatures) that prevent softener migration from the adhesive layer to the base material, thereby eliminating discoloration and deformation while maintaining the adhesive functionality.
Solution Approach 2:
The adhesive sheet is segmented into distinct functional layers: a base material layer, a barrier layer with specific resin composition and controlled thickness (0.01-10 μm), and a hot-melt pressure sensitive adhesive layer. This segmentation isolates the softener-containing adhesive from direct contact with the base material, preventing harmful interactions while preserving operational properties.
2Object-affected harmful factors
If the barrier layer thickness is increased to suppress softener migration, then protection of base material is improved, but manufacturing complexity and material consumption increase
Solution Approach 1:
The barrier layer uses resins with specifically controlled glass transition temperatures (40-130°C for polyester-based and polyurethane-based resins, or softening points of 0-100°C for polyolefin-based resins). This parameter control enables effective softener migration suppression at minimal thickness (0.01-10 μm), avoiding the need for thick barrier layers that would increase complexity and material consumption.
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 barrier layer effectively suppresses softener migration, preventing discoloration and deformation of the base material, thereby maintaining the integrity and performance of the adhesive sheet.
Implementation Method 1
providing a barrier layer containing at least one selected from the group consisting of a polyester-based resin, a polyurethane-based resin, and a polyolefin-based resin between a base material and a hot-melt pressure sensitive adhesive layer
Implementation Method 2
the polyester-based resin and the polyurethane resin each have a glass transition temperature of from 40 to 130° C.
Implementation Method 3
the polyolefin resin has a softening point of from 0 to 100° C.
Data Source
AI summary
A pressure sensitive adhesive sheet may include a base material and a hot-melt pressure sensitive adhesive layer which contains a softener, and further include a barrier layer disposed between the base material and the hot-melt pressure sensitive adhesive layer, the barrier layer containing at least one selected from the group consisting of a polyester-based resin, a polyurethane-based resin, and a polyolefin-based resin. The polyester-based resin may be at least one of a polyester resin or a modified polyester resin.