Photocurable Silicone Composition for LED and Metal-Halide Curing

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Solution Overview

Problem

Existing photocurable silicone compositions exhibit poor curability under LED and metal-halide lamps and are susceptible to light degradation and haze formation under high temperature/high humidity conditions.

Innovation Solution

A photocurable silicone composition comprising organopolysiloxane, a compound with two thiol groups, a photoradical initiator with a phosphorus atom, and a hydroxyphenyl triazine compound, which is cured using LED and metal-halide lamps, forming a cured product with enhanced light resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional photocurable silicone compositions are used, then curing can be achieved, but curability under LED and metal-halide lamps is poor

Engineering Contradiction:

ImprovecurabilityVSAvoidlight resistance

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent changes the chemical parameters of the silicone composition by incorporating specific compounds (hydroxyphenyl triazine, phosphorus-containing photoradical initiator, thiol group compound) to enable effective curing under LED and metal-halide lamp wavelengths while maintaining light resistance

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite photocurable silicone composition by combining multiple functional components: organopolysiloxane base, hydroxyphenyl triazine compound, phosphorus-containing photoradical initiator, and thiol group compound, where each component contributes specific properties to achieve both curability and light resistance

Inventive Principle:

Principle #40Composite materials

2Productivity

If silicone cured products are exposed to high temperature and high humidity conditions, then curing can proceed, but coloring and haze occur

Engineering Contradiction:

ImprovecuringVSAvoidcoloring and haze

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent uses hindered phenol compounds as sacrificial antioxidants that protect the silicone matrix from oxidation and degradation under high temperature and humidity conditions, preventing coloring and haze formation

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The patent modifies the chemical composition by adding hindered phenol compounds and optimizing the ratio of other components to enhance the thermal and environmental stability of the cured product, preventing harmful effects under harsh conditions

Inventive Principle:

Principle #35Parameter changes

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 curability and light resistance, forming a cured product with improved mechanical strength and optical transparency, suitable for optical devices.

Implementation Method 1

a photoradical initiator having a phosphorus atom

Methodology Applied

Scientific EffectPhotopolymerisation: Photopolymerisation

Implementation Method 2

a compound having at least two thiol groups in a molecule

Methodology Applied

Scientific EffectChemical Bonding: Chemical Bonding

Data Source

PatentUS12404374B2Photocurable silicone composition and cured product thereof

Publication Date: 2025.09.02 DOW SILICONES CORP

AI summary

A photocurable silicone composition is disclosed. A cured product of the composition is also disclosed, as well as methods of forming the same. The photocurable silicone composition comprises: (A) a specific organopolysiloxane having alkenyl groups in a molecule; (B) a compound having at least two thiol groups in a molecule; (C) a photoradical initiator having a phosphorus atom; and (D) a specific hydroxyphenyl triazine compound. The composition exhibits excellent curability by LED lamp with wide UV-Visible range as well as metal-halide lamp, and cures to form a cure product exhibiting excellent resistance to light.