UV-Absorbing Hard Coat Resin for Weather-Resistant Glass Films
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Solution Overview
Problem
Conventional hard coat laminated films lack sufficient weather resistance, abrasion resistance, and transparency when applied to the outdoor side of glass surfaces, such as window glass for buildings, automobile windows, and image display devices exposed to direct sunlight, necessitating a composition that can form a hard coat with improved properties for exterior use.
Innovation Solution
An active energy ray curable resin composition comprising a UV-absorbing polymer with specific structural units derived from benzotriazole, triazine, and benzophenone backbones, combined with polyfunctional (meth)acrylate, to form a hard coat laminated film with enhanced weather resistance, abrasion resistance, and transparency, suitable for exterior applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hard coat laminated film is applied to outdoor side of glass, then weather resistance is improved, but transparency deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the resin by incorporating specific UV-absorbing polymer structures (benzotriazole, triazine, benzophenone backbones) and controlling the ratio of polyfunctional (meth)acrylate components to achieve both weather resistance and transparency simultaneously
Solution Approach 2:
The patent creates a composite resin composition combining UV-absorbing polymer with specific polyfunctional (meth)acrylate compounds to achieve synergistic effects that provide both weather resistance and optical clarity
2Strength
If hard coat laminated film is applied to outdoor side of glass, then abrasion resistance is improved, but transparency deteriorates
Solution Approach 1:
The patent optimizes the molecular weight and functional group composition of the polyfunctional (meth)acrylate to achieve the right balance between forming a hard, abrasion-resistant coating and maintaining optical transparency
Solution Approach 2:
The composite resin system combines the protective properties of crosslinked polyfunctional (meth)acrylate with the UV-stability of specialized polymer backbones to achieve both abrasion resistance and transparency
3Ease of manufacture
If conventional resin composition is used, then manufacturing simplicity is maintained, but weather resistance deteriorates
Solution Approach 1:
The patent modifies the resin composition by incorporating UV-absorbing polymer with specific backbone structures and controlling the content of polyfunctional (meth)acrylate to achieve excellent weather resistance while maintaining ease of application and curing
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 achieves a hard coat laminated film with excellent weather resistance, abrasion resistance, and transparency, making it suitable for protecting window glass and image display devices from direct sunlight, while maintaining optical properties and adhesiveness.
Implementation Method 1
a UV-absorbing polymer... wherein the UV-absorbing polymer (A) is comprised of: (a1) 10-60 mol % of a structural unit derived from a (meth)acrylate having one or more of one or more types of backbones selected from the group consisting of a benzotriazole backbone, a triazine backbone, and a benzophenone backbone per molecule
Implementation Method 2
active energy ray curable resin composition... containing: (A) 100 parts by mass of a UV-absorbing polymer; and (B) 20-600 parts by mass of a polyfunctional (meth)acrylate
Data Source
AI summary
Embodiments provide an anchor coat agent, including: (P) a polymer comprised of: (p1) a structural unit derived from a (meth)acrylate having one or more of one or more types of backbones selected from the group consisting of a benzotriazole backbone, a triazine backbone, and a benzophenone backbone per molecule in an amount of 1-50 mol %, (p2) a structural unit derived from an alkyl (meth)acrylate in an amount of 30-95 mol %, and (p3) a structural unit derived from a hydroxyl group-containing (meth)acrylate in an amount of 1-50 mol %, provided that the sum of structural units derived from all constituent monomers is 100 mol %.