Benzophenone UV Absorber in Silicone Adhesive
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Solution Overview
Problem
Existing pressure-sensitive adhesive compositions for decorative sheets lack sufficient weather resistance and curability due to the inhibition of curing by ultraviolet absorbers, leading to deterioration of the print-receiving layer and contamination of adherends.
Innovation Solution
A pressure-sensitive adhesive composition incorporating a benzophenone-based ultraviolet absorber in a specific range (1-4 parts by weight) and a platinum group metal catalyst (0.001-0.05 parts by weight) with an addition reaction type silicone polymer, preventing curing inhibition and achieving a balance between weather resistance and curability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an ultraviolet absorber is incorporated into the pressure-sensitive adhesive to prevent light-induced deterioration, then weather resistance is improved, but curability of the silicone polymer deteriorates due to curing inhibition
Solution Approach 1:
The patent applies parameter changes by carefully controlling the amount of ultraviolet absorber within a specific range (0.1-5 parts by weight per 100 parts of silicone polymer) and selecting specific types of ultraviolet absorbers (benzotriazole-based or hindered amine-based) that do not strongly inhibit the platinum catalyst. This parameter optimization allows the adhesive to achieve both adequate UV protection and sufficient curability, resolving the contradiction between weather resistance and curing performance
Solution Approach 2:
The patent uses composite materials by combining specific types of silicone polymers (addition reaction type with vinyl groups) and organohydrogenosiloxanes in controlled ratios, along with selected ultraviolet absorbers and platinum group metal catalysts. This composite formulation ensures that the ultraviolet absorber provides weather resistance while the specific composition maintains curability through the addition reaction mechanism
2Reliability
If a high amount of ultraviolet absorber is used to enhance weather resistance, then protection against light-induced deterioration is improved, but adhesion performance deteriorates due to insufficient curing
Solution Approach 1:
The patent optimizes the concentration of ultraviolet absorber to a specific range (0.1-5 parts by weight per 100 parts of silicone polymer), preventing excessive UV absorption that would inhibit curing. This parameter control ensures adequate UV protection while maintaining sufficient adhesion performance through proper curing
Solution Approach 2:
The patent applies local quality by using different functional components in specific ratios: addition reaction type silicone polymers with vinyl groups, organohydrogenosiloxanes with Si-H groups, selected ultraviolet absorbers, and platinum group metal catalysts. Each component performs its specific function locally - UV protection, crosslinking, catalysis - ensuring both weather resistance and adhesion performance are achieved simultaneously
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 ensures stable adhesion, prevents print-receiving layer deterioration, and maintains excellent curability, reducing contamination and enhancing the durability of decorative sheets.
Implementation Method 1
a pressure-sensitive adhesive composition including an addition reaction type silicone polymer as a component (A); an ultraviolet absorber as a component (B); and a platinum group metal catalyst as a component (C)
Implementation Method 2
the ultraviolet absorber as the component (B) includes a benzophenone-based ultraviolet absorber
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A pressure-sensitive adhesive composition and a pressure-sensitive adhesive sheet have excellent weather resistance and contain a silicone polymer having excellent curability as a main agent. A pressure-sensitive adhesive composition includes an addition reaction type silicone polymer as a component (A); an ultraviolet absorber as a component (B); and a platinum group metal catalyst as a component (C). The ultraviolet absorber as the component (B) includes a benzophenone-based ultraviolet absorber and its amount is set to a value within the range of 1 part to 4 parts by weight relative to 100 parts by weight of the addition reaction type silicone polymer as the component (A). The amount of the platinum group metal catalyst as the component (C) is set to a value within the range of 0.001 parts to 0.05 parts by weight relative to 100 parts by weight of the addition reaction type silicone polymer as the component (A).