Halide-Free Flame-Retardant Adhesive Sheet for Electronic Labels
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Solution Overview
Problem
Conventional adhesive sheets used as management labels on electronic parts face challenges in achieving both excellent flame resistance and printability, particularly due to the presence of halogen-containing materials which can damage electronic circuits and generate toxic gases.
Innovation Solution
A flame-retardant laminate and adhesive sheet with a print-image-receiving layer composed of a resin and titanium oxide, lacking halides, exhibit a percent mass retention of 50% or higher at 600°C and a thickness of 10 μm or less, providing excellent flame resistance equivalent to VTM-0 and suitable printability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a coating layer made of polyester or polyurethane is employed as a print-image-receiving layer, then printability is improved, but flame resistance deteriorates
Solution Approach 1:
The patent uses a composite material consisting of inorganic powder (such as aluminum hydroxide, magnesium hydroxide, or titanium oxide) combined with an organic binder resin. This composite structure allows the coating layer to achieve both good printability from the resin component and high flame resistance from the inorganic powder component, which forms a protective char layer during combustion and releases water vapor to suppress flame propagation.
Solution Approach 2:
The patent optimizes specific parameters including the ratio of inorganic powder to binder resin (typically 90:10 to 99:1 by weight), particle size distribution of the inorganic powder (0.1-10 μm), and coating thickness (5-20 μm) to simultaneously achieve excellent printability and flame resistance equivalent to VTM-0 rating. These parameter adjustments balance the competing requirements of organic resin for printing and inorganic content for flame suppression.
2Reliability
If a print-image-receiving layer made from halo-polyolefin or polyvinyl chloride is used, then flame resistance is improved, but harmful factors are generated
Solution Approach 1:
The patent removes halogen-containing materials from the coating layer composition entirely, extracting the harmful element while retaining flame resistance functionality through alternative inorganic flame retardants such as aluminum hydroxide, magnesium hydroxide, or titanium oxide that do not produce corrosive or toxic gases during combustion.
Solution Approach 2:
The patent converts the potential harm of flame retardant materials into a beneficial effect by using inorganic powders that release water vapor during decomposition, which actively suppresses flame propagation and reduces smoke density. The decomposition reaction absorbs heat and releases non-toxic water vapor, transforming what could be a harmful chemical reaction into a protective mechanism that enhances flame resistance without generating harmful emissions.
3Ease of manufacture
If the print-image-receiving layer thickness is increased, then printability is improved, but flame resistance deteriorates
Solution Approach 1:
The patent optimizes the coating layer thickness to a specific range of 5-20 μm, which is sufficiently thick to provide good printability and image quality but thin enough to maintain excellent flame resistance. This parameter optimization ensures that the inorganic powder particles are distributed throughout a thin matrix, allowing rapid heat dissipation and efficient formation of a protective char layer during flame exposure.
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 enables the use of the laminate and adhesive sheet as management labels on electronic elements without halides, ensuring excellent printability and flame resistance, suitable for various printing processes and applications requiring flame resistance.
Implementation Method 1
exhibits a percent mass retention of 50% or higher as determined at 600° C. through thermal mass analysis
Data Source
AI summary
A flame-retardant laminate 10 having a substrate 11 and a print-image-receiving layer 12 stacked on the substrate 11, is characterized in that the substrate 11 has a flame resistance equivalent to VTM-0; and the print-image-receiving layer 12 contains a resin and titanium oxide and no halide; exhibits a percent mass retention of 50% or higher as determined at 600° C. through thermal mass analysis; and has a thickness of 10 μm or less.