CAS:90-93-7
Molecular Formula:C21H28N2O
Molecular Weight:324.46
EINECS:202-025-4
Products
4,4′-Bis(diethylamino) Benzophenone Photoinitiator EMK CAS 90-93-7
4,4′-Bis(diethylamino) benzophenone, cas 90-93-7 yellow to light yellow solid at room temperature and pressure. Also often called photoinitiator emk. Photoinitiator emk is a highly efficient type II free radical photoinitiator that can initiate polymerization reactions of oligomers under ultraviolet light irradiation, with an absorption wavelength range of 245-375nm.
This compound acts as a type II photoinitiator, typically used in combination with co-initiators such as amine or acrylate compounds, to generate free radicals that initiate polymerization. Its strong photosensitivity and high efficiency make it suitable for UV inks, coatings, adhesives, and 3D printing resins.
We are a professional supplier of photoinitiator EMK (CAS 90-93-7) with a strong focus on quality consistency, purity control, and timely delivery. Our technical team provides full formulation support to help customers achieve optimal curing performance in UV-curable systems.
| Item | Specification |
| Melting point | 89-92 °C(lit.) |
| Boiling point | 475.7±30.0 °C |
| Density | 1.048±0.06 g/cm3 |
| Vapor pressure | 0Pa at 20℃ |
| Flash point | 151 °C |
| LogP | 5.2 at 35℃ |
| Acidity coefficient (pKa) | 4.14±0.32(Predicted) |
UV Offset & Screen Printing Inks
4,4′-Bis(diethylamino) Benzophenone, commonly known as EMK photoinitiator, is widely used in UV offset inks, flexographic inks, and screen printing systems due to its strong photosensitizing capability and curing acceleration performance. It helps improve surface drying speed and enhances polymerization efficiency in high-speed printing applications.
It is frequently formulated together with 4-Methylbenzophenone and Photoinitiator ITX for optimized curing performance.
UV Adhesive Systems
EMK is suitable for UV-curable adhesive formulations requiring fast curing response and excellent photosensitivity. It acts as an efficient amine synergist in free radical photocuring systems.
The product shows excellent compatibility with acrylate monomers such as 4-Acryloylmorpholine and multifunctional oligomers used in UV adhesives.
UV Coatings & Overprint Varnishes
The product is suitable for UV wood coatings, paper varnishes, plastic coatings, and overprint varnishes requiring strong UV absorption and rapid photocuring efficiency.
As part of the UV-curing additive portfolio supplied by Unisunchem, EMK is widely used in industrial radiation-curing applications.
Photosensitive Resin & Electronic Materials
4,4′-Bis(diethylamino) Benzophenone is also used in photoresists, photosensitive resin plates, and electronic materials requiring enhanced light sensitivity and stable curing response.
It can be formulated together with Photoinitiator EDB to further improve photocuring efficiency.
Excellent Photosensitizing Performance
EMK provides strong photosensitizing capability and effectively accelerates photopolymerization reactions in UV-curing systems.
Improves Surface Curing
The product significantly improves surface drying speed and reduces oxygen inhibition in UV inks and coatings.
Good Compatibility
4,4′-Bis(diethylamino) Benzophenone shows excellent compatibility with benzophenone photoinitiators, thioxanthones, and acrylate monomers used in photocuring formulations.
Suitable for High-Speed UV Systems
Due to its rapid curing acceleration effect, EMK is highly suitable for industrial UV printing and coating systems requiring efficient production speed.
Broad Industrial Applications
The product is widely used in printing inks, coatings, adhesives, electronics, and photosensitive materials. You can explore more related materials in our Photoinitiator Solutions collection.
Because 4 4 bis diethylamino benzophenone is more sensitive to strong light exposure, in order to maintain the stability of its chemical properties, emk photoinitiator is indeed recommended to preserve away from light. When storing and handling, the time it is exposed to strong light should be minimized to avoid reactions or degradation caused by light. 25kg/drum or according to customer requirements.
Q1:What is 4,4′-Bis(diethylamino) Benzophenone used for?
It is mainly used as a UV photoinitiator synergist and photosensitizer in UV inks, UV coatings, UV adhesives, and photosensitive materials.
Q2:Why is EMK used in UV curing systems?
EMK improves photocuring efficiency, accelerates polymerization reactions, and enhances surface curing performance in UV-curable formulations.
Q3:Can EMK be used with other photoinitiators?
Yes. EMK is commonly formulated with Photoinitiator EDB, Photoinitiator ITX, and benzophenone photoinitiators to optimize curing performance.
Q4:What are the advantages of EMK photoinitiator?
The product offers strong photosensitivity, fast curing acceleration, broad compatibility, and reliable performance in industrial UV-curing systems.
Q5:Why choose Unisun Chem UV additives?
Unisunchem supplies high-quality UV photoinitiators and photocuring additives with stable quality, technical support, and customized formulation solutions for global UV industries.
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