Irradiation-crosslinkable silicone composition comprising pt(octane-2,4-dione)2 as a catalyst

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Solution Overview

Problem

Existing silicone compositions cross-linkable by irradiation face challenges such as low reactivity under UV-LED irradiation, stability issues without irradiation, solubility problems, and toxicity concerns with existing catalysts like Pt(acetylacetonate)2.

Innovation Solution

A silicone composition X cross-linkable by UV irradiation, specifically using Pt(octane-2,4-dione)2 as the hydrosilylation catalyst, which offers improved reactivity under UV-LED, stability without irradiation, good solubility in silicone compositions, and non-mutagenic properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If Pt(acetylacetonate)2 is used as catalyst, then crosslinking by irradiation is achieved, but toxicity concerns arise (reproductive toxicity)

Engineering Contradiction:

Improvecrosslinking capabilityVSAvoidtoxicity

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical parameters of the catalyst by replacing Pt(acetylacetonate)2 with Pt(octane-2,4-dione)2, which has different molecular structure and properties. This parameter change maintains the catalytic functionality while eliminating the reproductive toxicity issue, as confirmed by negative Ames test results for the new catalyst

Inventive Principle:

Principle #35Parameter changes

2Reliability

If existing photoactive organoplatinum complexes are used, then crosslinking by irradiation is achieved, but reactivity under UV-LED irradiation is insufficient

Engineering Contradiction:

Improvecrosslinking capabilityVSAvoidreactivity under UV-LED

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent optimizes the optical parameters of the catalyst system by selecting Pt(octane-2,4-dione)2 which has superior absorption characteristics in the UV-LED wavelength range (365-405 nm). This parameter change enables efficient photon absorption and rapid crosslinking reaction under UV-LED irradiation, achieving complete gelation in 1-5 minutes

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces a specific ligand structure (octane-2,4-dione) as an intermediary that mediates between the UV-LED irradiation and the platinum catalyst. This ligand acts as a photosensitizer that absorbs UV-LED photons and transfers energy to the Pt complex, enhancing the overall reactivity and efficiency of the crosslinking process

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If existing photoactive organoplatinum complexes are used, then crosslinking by irradiation is achieved, but stability without irradiation is poor (short gel time)

Engineering Contradiction:

Improvecrosslinking capabilityVSAvoidgel time without irradiation

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent modifies the chemical stability parameters of the catalyst system by using Pt(octane-2,4-dione)2, which exhibits enhanced kinetic stability in the absence of irradiation. This parameter change extends the gel time from minutes to several tens of days when stored in the dark, while maintaining rapid crosslinking capability when irradiated

Inventive Principle:

Principle #35Parameter changes

4Reliability

If existing photoactive organoplatinum complexes are used, then crosslinking by irradiation is achieved, but solubility problems occur in silicone compositions

Engineering Contradiction:

Improvecrosslinking capabilityVSAvoidsolubility

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent changes the molecular structure parameters of the catalyst complex by selecting Pt(octane-2,4-dione)2, which has improved solubility characteristics in silicone base oils and resins. This parameter change eliminates solubility issues and ensures homogeneous distribution of the catalyst throughout the silicone composition

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 silicone composition X exhibits rapid crosslinking under UV-LED irradiation, long gel time without irradiation, excellent solubility, and is non-toxic, addressing the limitations of previous systems.

Implementation Method 1

a silicone composition X cross-linkable by photonic irradiation

Methodology Applied

Scientific EffectPhotonic irradiation: Light

Implementation Method 2

cross-linkable by polyaddition reactions

Methodology Applied

Scientific EffectHydrosilylation: Chemical Bonding

Implementation Method 3

catalyzed by a hydrosilylation catalyst C which is Pt(octane-2,4-dione)2

Methodology Applied

Scientific EffectCatalysis: Catalysis

Data Source

PatentUS20250197671A1Irradiation-crosslinkable silicone composition comprising pt(octane-2,4-dione)2 as a catalyst

Publication Date: 2025.06.19 ELKEM SILICONES FRANCE SAS

AI summary

A silicone composition X that is cross-linkable by polyaddition reactions to form a silicone elastomer. In particular, a silicone composition X that is cross-linkable by photonic irradiation catalyzed by a hydrosilylation catalyst C, which is Pt(octane-2,4-dione)2. Also, a method for preparing silicone elastomers using the silicone composition X and a method for hydrosilylation in which the catalyst is Pt(octane-2,4-dione)2.