Polymerizable Composition for Optical Material

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Solution Overview

Problem

Existing polymerizable compositions for optical materials face issues with cracks during polymerization and breaking during release, particularly when using diisopropyl peroxydicarbonate as a catalyst, which has stability and safety concerns, and other catalysts may still result in defects like cracks and breaking.

Innovation Solution

A polymerizable composition combining a compound with two or more allyloxycarbonyl groups, a radical polymerization initiator such as a peroxyketal-based initiator, and a modifier like a polyether-modified siloxane compound, along with an ultraviolet absorber and dye, to suppress cracks and ensure transparency and productivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If diisopropyl peroxydicarbonate is used as a polymerization catalyst, then polymerization can be achieved, but cracks occur during polymerization and breaking occurs during releasing

Engineering Contradiction:

Improvepolymerization processVSAvoidlens integrity

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent changes the chemical parameters by substituting diisopropyl peroxydicarbonate with alternative polymerization catalysts such as benzophenone-based UV absorbers and other peroxide compounds, adjusting catalyst concentration and type to eliminate crack formation while maintaining polymerization effectiveness

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces block copolymers as intermediary substances that modify the polymerization process, acting as mediators between the catalyst and monomer to control polymerization kinetics and prevent crack formation during curing

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If other polymerization catalysts are used instead of diisopropyl peroxydicarbonate, then stability and safety are improved, but cracks and breaking still occur

Engineering Contradiction:

Improvecatalyst stabilityVSAvoidlens defect rate

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent employs composite catalyst systems combining multiple substances (benzophenone-based UV absorbers with other peroxide compounds) and composite polymer formulations including block copolymers, monomers, and oligomers to achieve both catalyst stability and defect-free lens production

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent incorporates block copolymers and other additives into the monomer composition before polymerization begins, preparing the system in advance to control polymerization kinetics and prevent crack formation during the curing process

Inventive Principle:

Principle #10Preliminary action

3Object-affected harmful factors

If ultraviolet absorber is added to block blue light, then eye protection is improved, but polymerization may be inhibited

Engineering Contradiction:

Improveblue light exposureVSAvoidpolymerization process

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The patent uses specific concentrations of ultraviolet absorbers (blocking blue light at 420nm) while compensating with additional or alternative polymerization catalysts to maintain sufficient polymerization activity, applying partial action of UV absorption without completely inhibiting the curing process

Inventive Principle:

Principle #16Partial or excessive action

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 solution effectively prevents cracks during polymerization and release while maintaining excellent transparency and productivity, suitable for use in plastic eyeglass lenses, and enhances the blocking of harmful blue light around 420 nm, reducing eye fatigue and stress.

Implementation Method 1

at least one kind of radical polymerization initiator (B) selected from the group consisting of a peroxyketal-based radical polymerization initiator, a peroxymonocarbonate-based radical polymerization initiator, and a peroxyester-based radical polymerization initiator

Methodology Applied

Scientific EffectRadical polymerization: Photopolymerisation

Implementation Method 2

an ultraviolet absorber (D) represented by General Formula (d)... the ultraviolet absorber (D) is included in an amount of 0.01 to 5 parts by weight with respect to 100 parts by weight of the compound (A)... an average light transmittance of 0.5% or less in a wavelength range of 300 nm or more and 400 nm or less

Methodology Applied

Scientific EffectUltraviolet absorption: Absorption (EM radiation)

Data Source

PatentUS11474280B2Polymerizable composition for optical material and optical material and plastic lens obtained from same composition

Publication Date: 2022.10.18 MITSUI CHEMICALS INC

AI summary

The polymerizable composition for an optical material of the present invention includes a compound (A) represented by General Formula (a) and including two or more allyloxycarbonyl groups, at least one kind of radical polymerization initiator (B) selected from the group consisting of a peroxyketal-based radical polymerization initiator, a peroxymonocarbonate-based radical polymerization initiator, and a peroxyester-based radical polymerization initiator, and a modifier (C) selected from a polyether modified siloxane compound represented by General Formula (c1) or a polyol compound represented by General Formula (c2).