Spectacle Lens Hard Coat Layer Cracking and Scratch Resistance
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Solution Overview
Problem
Existing spectacle lenses lack effective cracking suppression and scratch resistance, particularly in the hard coat layer.
Innovation Solution
A spectacle lens composition comprising a spectacle lens base, a primer layer, and a hard coat layer, where the hard coat layer is formed by applying compositions in a multilayer manner. Each composition contains an organic compound X, an inorganic compound Y, and a polymerization initiator, with varying mass ratios of inorganic compound Y to organic compound X, and specific polymerization initiators that satisfy certain molar absorption coefficient ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a hard coat layer is formed by curing a composition including inorganic oxide particles and an organic silicon compound, then scratch resistance is improved, but cracking suppression is insufficient
Solution Approach 1:
The patent uses a composite material system consisting of inorganic oxide particles (such as silicon oxide, aluminum oxide) dispersed in an organic compound matrix. This composite structure combines the hardness and scratch resistance of inorganic particles with the flexibility and cracking suppression of the organic binder, resolving the contradiction between scratch resistance and cracking suppression
Solution Approach 2:
The patent optimizes parameters including the mass ratio of inorganic oxide particles to organic compound (1:4 to 4:1), particle size distribution (0.1-10 μm), and crosslinking density of the organic compound. These parameter changes enable the hard coat layer to achieve both high scratch resistance and effective cracking suppression by balancing hardness and flexibility
2Strength
If the hard coat layer is made harder to improve scratch resistance, then scratch resistance is improved, but adhesion between layers deteriorates
Solution Approach 1:
The patent creates local quality variations within the hard coat layer by using inorganic oxide particles with different hardness, size, and distribution. The organic compound matrix provides a flexible binder phase that maintains adhesion, while localized regions with higher inorganic particle concentration provide scratch resistance. This local differentiation resolves the contradiction between hardness and adhesion
Solution Approach 2:
The organic compound acts as an intermediary between the inorganic oxide particles and the substrate. It bonds the hard inorganic particles together and to the underlying layer, transferring stress and preventing delamination. This intermediary binder maintains adhesion while allowing the inorganic particles to provide scratch resistance
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 described spectacle lens configuration achieves enhanced cracking suppression and scratch resistance, with improved adhesion between layers and resistance to heat, as demonstrated by various evaluation criteria.
Implementation Method 1
each of the compositions contains an organic compound X selected from the group consisting of a polymerizable compound and a polymer thereof, an inorganic compound Y selected from the group consisting of inorganic oxide particles and silsesquioxane, and a polymerization initiator
Implementation Method 2
when the compositions contain the polymer, at least a part of the polymer and at least a part of the inorganic compound Y may be bonded together
Data Source
Figure 1
AI summary
The present invention provides a spectacle lens excellent in cracking suppression properties and scratch resistance. There is provided a spectacle lens comprising a spectacle lens base, a primer layer, and a hard coat layer in this order, wherein the hard coat layer is composed of a plurality of resin layers formed by applying compositions in a multilayer manner, each of the compositions contains an organic compound X selected from the group consisting of a polymerizable compound and a polymer thereof, an inorganic compound Y selected from the group consisting of inorganic oxide particles and silsesquioxane, and a polymerization initiator, when the compositions contain the polymer, at least a part of the polymer and at least a part of the inorganic compound Y may be bonded together, and Requirement 1 and Requirement 2 are satisfied.