Radical Polymerizable Composition for Plastic Lens

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Solution Overview

Problem

Existing resin materials for plastic lenses, particularly those with a fluorene skeleton, face challenges in achieving both high refractive index and toughness, often resulting in brittle cured products that are prone to cracking and chipping.

Innovation Solution

A radical polymerizable composition comprising phenylbenzyl(meth)acrylate, urethane(meth)acrylate with an aromatic ring, and a radical polymerization initiator, which allows for a low viscosity suitable for coating without solvents, forming a cured product with a high refractive index and improved toughness.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If a compound having a fluorene skeleton is used to achieve a high refractive index, then the refractive index is improved, but the cured product becomes brittle and has low toughness

Engineering Contradiction:

Improverefractive indexVSAvoidtoughness

Core Design Contradiction:

Illumination intensityVSStrength

Solution Approach 1:

The patent uses a composite resin composition containing both a fluorene skeleton compound (for high refractive index) and a cycloolefin compound (for toughness and flexibility). This composite approach allows the cured product to simultaneously achieve high refractive index (1.53 or more) and high toughness, preventing the brittleness that occurs when using only fluorene skeleton compounds.

Inventive Principle:

Principle #40Composite materials

2Illumination intensity

If a compound having a fluorene skeleton is used, then the refractive index is improved, but the cured product is prone to cracking and chipping

Engineering Contradiction:

Improverefractive indexVSAvoidcrack resistance

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The composite resin composition combines a fluorene skeleton compound with a cycloolefin compound, where the cycloolefin component provides flexibility and crack resistance. This composite structure prevents cracking and chipping while maintaining the high refractive index property.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent specifies precise compositional parameters: the fluorene skeleton compound content is controlled at 5-50 mass% and the cycloolefin compound at 50-95 mass%. By optimizing these parameter ranges, the cured product achieves both high refractive index and high crack resistance.

Inventive Principle:

Principle #35Parameter changes

3Illumination intensity

If compounds having high viscosity are used to achieve high refractive index, then the refractive index is improved, but the resin composition becomes difficult to coat

Engineering Contradiction:

Improverefractive indexVSAvoidcoatability

Core Design Contradiction:

Illumination intensityVSEase of operation

Solution Approach 1:

The patent combines a high refractive index fluorene skeleton compound with a cycloolefin compound that has low viscosity and good flow properties. This composite formulation achieves a balanced viscosity that allows complete filling of die cavities and good coatability, while the cured product maintains a high refractive index of 1.53 or more.

Inventive Principle:

Principle #40Composite materials

4Ease of operation

If only low viscosity compounds are used to ensure good coatability, then the ease of operation is improved, but the refractive index of the cured product decreases

Engineering Contradiction:

ImprovecoatabilityVSAvoidrefractive index

Core Design Contradiction:

Ease of operationVSIllumination intensity

Solution Approach 1:

The composite resin composition synergistically combines a fluorene skeleton compound (providing high refractive index) with a cycloolefin compound (providing low viscosity and good flow). This combination allows the resin to have both good coatability and high refractive index (1.53 or more) in the cured product, resolving the trade-off between ease of operation and optical performance.

Inventive Principle:

Principle #40Composite materials

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 cured product with high refractive index and toughness, preventing cracking and chipping, and is suitable for producing plastic lenses with enhanced optical and mechanical properties.

Implementation Method 1

a radical polymerizable composition including phenylbenzyl(meth)acrylate (A), a urethane(meth)acrylate (X) having an aromatic ring in its molecular structure, and a radical polymerization initiator (Y) as essential components

Methodology Applied

Scientific EffectRadical polymerization: Photopolymerisation

Data Source

PatentUS9156931B2Radical polymerizable composition, cured product, and plastic lens

Publication Date: 2015.10.13 DIC CORP

AI summary

There are provided a radical polymerizable composition having a low viscosity suitable for coating, a cured product obtained by curing the composition, the cured product having a high refractive index and high toughness and being not easily cracked or chipped when cutting, and a plastic lens obtained by curing the composition. A radical polymerizable composition includes phenylbenzyl(meth)acrylate (A), a urethane(meth)acrylate (X) having an aromatic ring in its molecular structure, and a radical polymerization initiator (Y) as essential components.