Photoreactive Primer Composition for Long-Lasting Polyolefin Adhesion
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Solution Overview
Problem
Conventional primer compositions using hydrogen abstraction-type initiators lose their adhesive-enhancing effect over time before active energy ray irradiation, and require multiple types of primers for different adhesives and sealants.
Innovation Solution
A primer composition comprising benzophenone, a compound with two or more benzene rings and a molecular weight of 190 or more, and a solvent, which maintains adhesive force for a prolonged duration and is compatible with various curable resin compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional hydrogen abstraction-type initiator primer compositions are used, then adhesive force improvement is achieved, but the duration of effect is short and adhesive force is lost over time before irradiation
Solution Approach 1:
The patent changes the chemical parameters of the primer composition by replacing conventional hydrogen abstraction-type initiators with a specific photoinitiator system consisting of benzophenone and a compound with two or more benzene rings (molecular weight ≥190). This parameter change in the initiator chemistry enables the primer to maintain its adhesive-enhancing effect for extended periods before irradiation, directly resolving the contradiction between achieving adhesive force improvement and maintaining its duration.
2Adaptability or versatility
If multiple types of primers are used for different adhesives and sealants, then compatibility with various curable resin compositions is achieved, but device complexity and selection requirements increase
Solution Approach 1:
The patent creates a universal primer composition that can be used with multiple types of curable resin compositions (adhesives and sealants) regardless of their curing method. The photoinitiator system based on benzophenone and compounds with two or more benzene rings provides broad compatibility across different resin systems, eliminating the need to select different primers for different adhesives and thereby reducing system complexity.
3Strength
If conventional primers are used, then adhesive force improvement is achieved, but it requires multiple types of primers depending on the adhesive and sealant type
Solution Approach 1:
The patent develops a single primer composition formulation that universally works with various types of adhesives and sealants. The specific photoinitiator combination of benzophenone and compounds with two or more benzene rings creates a versatile system that maintains adhesive force improvement across different curable resin compositions, eliminating the need for multiple specialized primers.
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 primer composition effectively improves adhesive force on hard-to-bond materials like polypropylene and polyethylene, maintaining effectiveness for extended periods and supporting various curing methods of adhesives and sealants.
Implementation Method 1
the primer composition does not require dedicate facilities... surface modification can be conducted using a hydrogen abstraction-type initiator as a primer treatment agent... irradiating the dried primer composition with an active energy ray
Data Source
AI summary
The present invention relates to a primer composition that achieves excellent adhesion to poorly adhesive materials. Specifically, the present invention relates to a primer composition that includes (A) benzophenone, (B) a compound that has at least 2 benzene rings and a molecular weight of at least 190, and (C) a solvent.