Hard-coat Composition with Nanoparticles for Scratch Resistance and Moldability
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Solution Overview
Problem
Conventional resin film laminates with hard-coat layers face challenges in achieving both high hardness and scratch resistance while maintaining moldability, making it difficult to produce resin compositions that satisfy these distinct characteristics.
Innovation Solution
A curable hard-coat composition comprising a (meth)acryloyl polymer and inorganic oxide nanoparticles, specifically with a (meth)acrylate equivalent of 200-500 g/eq and weight average molecular weight of 5,000-200,000, along with silica nanoparticles of 6 nm to less than 95 nm, which provides excellent scratch resistance and moldability upon curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a hard-coat composition is designed to achieve high hardness and scratch resistance, then the protective performance is improved, but the moldability during processing deteriorates
Solution Approach 1:
The patent applies parameter changes by carefully controlling the molecular weight (5,000-200,000) and (meth)acrylate equivalent (200-500 g/eq) of the polymer, as well as the particle size (6 nm to less than 95 nm) of inorganic oxide nanoparticles. These parameter optimizations enable the composition to achieve both high scratch resistance after curing and excellent moldability during processing
Solution Approach 2:
The patent uses composite materials by combining organic polymer components with inorganic oxide nanoparticles. This composite structure provides both the flexibility needed for moldability and the hardness/scratch resistance required for protective performance, resolving the contradiction between these opposing requirements
2Strength
If the polymer molecular weight is increased to improve scratch resistance, then the hardness is improved, but the moldability and processability worsen
Solution Approach 1:
The patent applies parameter changes by defining a specific molecular weight range (5,000-200,000) for the polymer. This optimized range balances the competing requirements: higher molecular weight provides scratch resistance while the lower bound ensures sufficient processability and moldability during fabrication
3Strength
If the inorganic oxide nanoparticle size is reduced to improve scratch resistance, then the hardness is improved, but the dispersion and processing difficulty increase
Solution Approach 1:
The patent applies parameter changes by specifying a nanoparticle size range (6 nm to less than 95 nm). This optimization achieves high scratch resistance through sufficient nanoparticle refinement while preventing excessive fineness that would cause aggregation and processing difficulties. The upper limit of 95 nm ensures dispersibility and processability
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 high hardness and scratch resistance after curing while maintaining excellent moldability before curing, making it suitable for applications in mobile devices and automobile interior parts.
Implementation Method 1
a curable hard-coat composition containing certain polymer and nanoparticles has excellent characteristics that enables the above-described objective to be achieved
Data Source
AI summary
The purpose of this invention is to provide: a hard-coat composition with which it is possible to produce a hard-coat layer having excellent hardness and abrasion-resistance when cured, and having excellent moldability during processing; and a laminate film and the like having such a hard-coat composition. This problem is solved by a curable hard-coat composition containing a (meth)acryloyl polymer and inorganic oxide nanoparticles, wherein the (meth)acryloyl polymer has a (meth)acrylic equivalent of 200-500 g/eq and a weight-average molecular weight of 5,000-200,000.