Adhesive Label Laminate Abrasion Resistance via Polyurethane Silica Coating
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Solution Overview
Problem
GHS labels require enhanced abrasion resistance and durability, particularly in sea water immersion tests and artificial weathering, which existing label materials and adhesives often fail to meet, as per the British Standards BS5609: 1986.
Innovation Solution
A laminate comprising a surface coating layer with 70-99% polyurethane resin and 1-25% colloidal silica sol with a metal oxide layer, applied to a thermoplastic resin film layer, and a pressure-sensitive adhesive layer, providing excellent water resistance and abrasion resistance for printed information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional label materials and adhesives are used, then basic labeling function is provided, but abrasion resistance and water resistance required by BS5609: 1986 standards are insufficient
Solution Approach 1:
The patent applies composite materials by combining polyurethane resin (70-99% by mass) with colloidal silica sol containing metal oxide (1-25% by mass) to form a surface coating layer. This composite structure provides both the abrasion resistance from polyurethane and the water resistance from colloidal silica, meeting BS5609: 1986 standards while maintaining manufacturability through a systematic formulation approach.
Solution Approach 2:
The patent employs parameter changes by precisely controlling the composition ratios (70-99% polyurethane resin, 1-25% colloidal silica sol) and application amount (0.07-20 g/m²) of the surface coating layer. These optimized parameters ensure the laminate achieves the required abrasion and water resistance while maintaining ease of manufacture through defined processing parameters.
2Reliability
If the surface coating layer contains high amount of polyurethane resin to improve abrasion resistance, then abrasion resistance improves, but water resistance may deteriorate
Solution Approach 1:
The patent resolves this contradiction by using a composite material system where polyurethane resin (70-99% by mass) provides abrasion resistance and colloidal silica sol with metal oxide (1-25% by mass) provides water resistance. The synergistic combination allows both properties to be achieved simultaneously, with the metal oxide layer on colloidal silica particles specifically contributing to water repellency while the polyurethane matrix ensures mechanical durability.
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 and adhesive label exhibit superior abrasion resistance and water resistance, conforming to BS5609: 1986 standards, making them suitable for GHS label applications.
Implementation Method 1
colloidal silica sol having a metal oxide layer on the surface
Implementation Method 2
surface coating layer contains 70 to 99% by mass of a polyurethane resin, and 1 to 25% by mass of colloidal silica sol
Data Source
Figure 1
AI summary
An object of the present invention is to provide a laminate that can be adapted to electrophotographic printing in the form of an adhesive label and has excellent abrasion resistance required by BS5609: 1986. The present invention relates to a laminate including a surface coating layer containing 66 to 99% by mass of a polyurethane resin and 1 to 34% by mass of a fine particle having a metal oxide, and a thermoplastic resin film layer including an olefin-based resin, wherein an amount of the surface coating layer applied to the thermoplastic resin film layer is 0.07 to 20 g/m2 in terms of a solid content after drying per unit area.