Irgacure® 500 is a photoinitiator used to initiate the photo polymerization of chemically unsaturated prepolymers, particularly acrylates, in combination with mono- or multifunctional monomers. Here are some key details about Irgacure® 500:
Chemical Nature: It is a blend of two photoinitiators: 1-hydroxycyclohexyl phenyl ketone (Irgacure® 184) and benzophenone (Darocur® BP).
CAS Numbers:
Physical Form: Clear viscous yellow liquid
Applications: Irgacure® 500 is especially suitable for pigmented UV-curable systems, photoresists, and printing plates. It can be used alone or in combination with suitable amines acting as co-initiators or in combination with amine-modified resins for applications such as UV-curable clear coatings for paper, metal, and plastic materials.
Storage: It should be stored below 18 °C (65 °F) to prevent partial solidification. If solidification occurs, the product can be re-liquefied by heating to 25 – 35 °C (77 – 95 °F) using methods such as placing the drum into a hot-water bath.
Safety: Proper handling procedures should be followed as outlined in the safety data sheet. Exposure to sunlight should be avoided, and opened packaging should be closed after use to protect the product against light.
Miscibility: Irgacure® 500 is miscible in most common organic solvents but poorly soluble in water.
Recommended Concentrations: The recommended concentrations of Irgacure® 500 in formulations typically range from 2% to 6%, depending on the specific application.
This information provides guidance on the use, handling, and storage of Irgacure® 500, but users are advised to conduct their own investigations and tests to ensure suitability for their specific purposes.
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