Hologram Recording Composition for Sensitizing Dye Storage Stability

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Solution Overview

Problem

Photosensitive compositions containing epoxy compounds promote decoloring of sensitizing dyes during unexposed storage, which affects the sensitivity and stability of hologram recording media.

Innovation Solution

Incorporating a polymerizable compound, an electron-donating initiator, a dye whose decoloring reaction is promoted by an epoxy group, and a cationic polymerizable compound with specific structural features, such as cyclic ester or 3-membered ring ether structures, to suppress decoloring and enhance stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If an epoxy compound is used as a cationic polymerizable compound in the photosensitive composition, then the reactivity and polymerization efficiency are improved, but the decoloring of the sensitizing dye is promoted during unexposed storage

Engineering Contradiction:

Improvepolymerization efficiencyVSAvoidstability of sensitizing dye

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent changes the chemical structure parameters of the cationic polymerizable compound by introducing a specific structural feature: a 3-membered ring ether structure (epoxy group) adjacent to a cyclic aliphatic skeleton. This structural modification allows the compound to maintain high reactivity while suppressing the decoloring reaction of the sensitizing dye, thus resolving the contradiction between polymerization efficiency and dye stability.

Inventive Principle:

Principle #35Parameter changes

2Use of energy by moving object

If a sensitizing dye is added to increase light sensitivity, then the sensitivity to light is improved, but the decoloring reaction is promoted in the presence of epoxy groups

Engineering Contradiction:

Improvelight sensitivityVSAvoiddecoloring reaction

Core Design Contradiction:

Use of energy by moving objectVSObject-generated harmful factors

Solution Approach 1:

The patent introduces a specific structural configuration (cyclic aliphatic skeleton adjacent to the epoxy group) as an intermediary structure that mediates between the epoxy group and the sensitizing dye. This structural intermediary reduces the direct interaction between the epoxy group and the dye, thereby suppressing the decoloring reaction while maintaining the light sensitivity enhancement function.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Loss of time

If the photosensitive composition is stored for extended periods before use, then the preparation time is reduced, but the decoloring of the sensitizing dye increases during storage

Engineering Contradiction:

Improvepreparation timeVSAvoidstorage stability

Core Design Contradiction:

Loss of timeVSDuration of action of stationary object

Solution Approach 1:

The patent performs preliminary action by designing a photosensitive composition with a specific cationic polymerizable compound structure that preemptively prevents the decoloring reaction during storage. The structural design (epoxy group adjacent to cyclic aliphatic skeleton) is prepared in advance to suppress harmful interactions, enabling long-term storage without significant dye decoloring and thus allowing extended preparation time flexibility.

Inventive Principle:

Principle #10Preliminary 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 decoloring of sensitizing dyes during unexposed storage, maintaining sensitivity and stability of hologram recording media, thereby improving the performance of hologram recording media, optical elements, and electronic devices.

Implementation Method 1

a polymerizable compound; an electron-donating initiator; a cationic polymerizable compound having at least one structure selected from the group consisting of a cyclic ester structure and a 3-membered ring ether structure adjacent to a cyclic aliphatic skeleton in a molecule

Methodology Applied

Scientific EffectPolymerization: Photopolymerisation

Implementation Method 2

The photosensitive composition usually contains a sensitizing dye to increase the sensitivity to light

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Data Source

PatentUS20250370407A1Photosensitive composition, hologram recording medium, hologram optical element, optical device, and electronic device

Publication Date: 2025.12.04 SONY GROUP CORP

AI summary

Provided is a photosensitive composition that can achieve suppression of decoloring of a sensitizing dye during unexposed storage.A photosensitive composition contains a polymerizable compound, an electron-donating initiator, a dye whose decoloring reaction is promoted in the presence of an epoxy group, and a cationic polymerizable compound having at least one structure selected from the group consisting of a cyclic ester structure and a 3-membered ring ether structure adjacent to a cyclic aliphatic skeleton in a molecule.