Introduction about several photoinitiators

Photoinitiators is also called photosensitizer or light curing agents. It is a kind of energy absorbing certain wavelengths in ultraviolet light (250~420nm) or visible region (400~800nm) and produce free radicals and cations, thus it triggers polymerization of cross-linked compounds.

Here are several commonly used photoinitiators from OKCHEM

Photoinitiator 184



Product Name : l-Hydroxy-Cyclohexyl-Phenyl-Ketone
Molecular Weight : 204.3
CAS No. : 947-19-3
Appearance: white crystalline powder
Melting point (°C) : 44-48
Applications: 184 applied to copying varnishes, plastics, paint, wood paint, adhesives, offset inks, screen printing inks, flexographic inks, electronic products. Generally, added with other photo-initiator. It can be used with UV absorbers if required. 2-5%w/w is recommended.
As highly efficient photoinitiator for UV curable systems, it provides non-yellowing durability and longer shelf life for UV curable systems.

Photoinitiator TPO

Product Name : 2,4,6-Trimethylbenzoyldiphenylphosphine oxide
Molecular Weight : 348.38
CAS No. : 75980-60-8
Melting point (°C) : 91-94
Appearance : Light yellow crystalline powder
Applications: TPO is an effective photoinitiator for UV-curable based coatings, adhesives, inks and printing plates. It can make white paint and thick coating (TiO2 as white pigment) fully cured. TPO is a powerful free radicals (I) type of photoinitiator, especially suitable for coloured system and areas of thick film curing. 0.5-4%w/w is recommended.

Photoinitiator 819

Product Name : Phenyl bis(2,4,6-trimethylbenzoyl)-phosphine oxide
Molecular Formula : C26H27O3 P
Molecular Weight : 418.46
CAS No. : 162881-26-7
Melting point (°C) : 127-132
Applications: It can be used in UV-curable varnish and paint system, such as wood, paper, matel, plastic, printing ink, etc. Usually, it will be used together with 184 and BDK.

Photoinitiator 1173

Product Name : 2-Hydroxy-2-Methyl-Phenyl-Propane-1-one
Molecular Formula : C10H12O2
Molecular Weight : 164.2
CAS No. : 7473-98-5
Appearance : Colorless to pale yellow and clear liquid
Applications: As a liquid photoinitiators, 1173 has a very good compatibility and can easily mix with other photo-initiator and prepolymer. 1173 is a photoinitiator for UV curing acrylic resin for coating wood, metal, paper and plastic etc. It provides non-yellowing durability and longer shelf life for UV curable systems.

NOTE

The above information is provided as guidelines only. It is important that the customers evaluate any product in their own system to determine suitability.
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