Polyurethane Optical Resin Composition for Impact and UV Resistance

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Solution Overview

Problem

Current optical resin compositions for eyeglass lenses face challenges such as inadequate impact resistance, heat resistance, and UV/near-infrared light blocking capabilities, particularly after multi-coating, which limits their suitability for industrial safety and sports applications.

Innovation Solution

A polyurethane optical polymerizable composition comprising a mixture of biuret, 1,6-hexamethylene diisocyanate, isophorone diisocyanate, and specific polythiols, combined with UV and near-infrared absorbents, is developed to enhance impact resistance and heat resistance while effectively blocking electromagnetic waves in the UV and near-infrared ranges.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If multi-coating is performed on plastic lenses to improve transmittance, then transmittance is improved, but impact resistance deteriorates because externally applied impact is concentrated on one spot

Engineering Contradiction:

ImprovetransmittanceVSAvoidimpact resistance

Core Design Contradiction:

Illumination intensityVSStrength

Solution Approach 1:

The patent combines multiple functional properties (impact resistance, heat resistance, UV blocking, near-infrared blocking) into a single resin composition rather than applying separate coatings. This merging approach allows the lens material itself to provide all required functions, eliminating the weakness of multi-coated surfaces under impact while maintaining transmittance and providing comprehensive protective and functional properties.

Inventive Principle:

Principle #5Merging (Combining)

2Ease of manufacture

If thermoplastic resin is used for optical lenses, then processability is improved, but heat resistance deteriorates causing severe deformation during use

Engineering Contradiction:

ImproveprocessabilityVSAvoidheat resistance

Core Design Contradiction:

Ease of manufactureVSTemperature

Solution Approach 1:

The patent changes the chemical composition parameters by incorporating specific polyols with high glass transition temperatures and controlled functionality into the polyurethane system. This adjusts the resin's thermal properties to achieve high heat resistance while maintaining processability through proper formulation of the polymerizable composition.

Inventive Principle:

Principle #35Parameter changes

3Illumination intensity

If resin composition is designed for high index of refraction, then optical performance is improved, but Abbe number decreases reducing image quality

Engineering Contradiction:

Improveindex of refractionVSAvoidAbbe number

Core Design Contradiction:

Illumination intensityVSMeasurement precision

Solution Approach 1:

The patent uses a composite resin composition combining polyurethane base resin with specific polyols and additives that provide both high index of refraction and high Abbe number. This composite approach allows simultaneous optimization of optical properties by selecting complementary materials whose combined properties exceed those of individual components.

Inventive Principle:

Principle #40Composite materials

4Strength

If existing polyurethane resin compositions are used, then impact resistance is improved, but UV and near-infrared blocking capabilities are insufficient

Engineering Contradiction:

Improveimpact resistanceVSAvoidUV and near-infrared blocking

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The patent creates a universal resin composition that simultaneously provides impact resistance, heat resistance, UV blocking, and near-infrared blocking properties. This multi-functional formulation eliminates the need for separate treatments or coatings for each protective function, as the resin itself incorporates all required properties through its composition design.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 excellent impact resistance and heat resistance, meeting FDA and industrial safety standards, and effectively blocks UV and near-infrared light, making it suitable for industrial safety and sports applications without the need for primer coating.

Implementation Method 1

A polyurethane optical polymerizable composition comprising a mixture of biuret, 1,6-hexamethylene diisocyanate, isophorone diisocyanate, and specific polythiols

Methodology Applied

Scientific EffectPolymerization: Photopolymerisation

Implementation Method 2

combined with UV and near-infrared absorbents, is developed to enhance impact resistance and heat resistance while effectively blocking electromagnetic waves in the UV and near-infrared ranges

Methodology Applied

Scientific EffectAbsorption (EM radiation): Absorption (EM radiation)

Data Source

PatentUS10227442B2Optical resin composition and optical lens using same

Publication Date: 2019.03.12 KS LABORATORIES CO LTD

AI summary

The present invention provides an optical polymerizable composition, an optical composition, a large-area window, a polyisocyanate composition, and eyeglass lens and producing method thereof. The optical polymerizable composition is composed of a polythiol compound and a polyisocyanate compound, and a urethane-based optical lens obtained by reacting the compounds has a low specific gravity and thus is lightweight, and has excellent heat resistance, and particularly, problems of degradation in impact resistance which appear after hard-multi coating are solved. The lens produced using the composition has various excellent optical characteristics including workability such as formability and dyeability, transparency and the like.