Omnirad 184

Omnirad 184 is a photoinitiator utilized to initiate the photopolymerization of chemically unsaturated prepolymers, such as acrylates, in combination with mono- or multifunctional vinyl monomers. Here's a breakdown of its properties and applications:

Chemical Data:

• Chemical Name: 1-Hydroxycyclohexyl-phenyl ketone
• Molecular Weight: 204.3 g/mol
• CAS No: 947-19-3

Specification:

• Appearance: Fine to coarse, white powder
• Purity (GC analysis): ≥ 99.0%
• Volatiles Loss on Drying: ≤ 0.5%
• Transmittance @ 425 nm (Spectrophotometer, 10g/100ml Toluene): ≥ 98.0%
• Transmittance @ 500 nm (Spectrophotometer, 10g/100ml Toluene): ≥ 98.0%
• Clarity of solution (Visual, 10g/100ml Toluene): Clear

Additional Typical Properties:

• Melting point: 47 – 49 °C (117 – 120 °F)
• Solubility at 20 °C (68 °F):
  • Butyl acetate: > 50% by weight
  • Hexanediol diacrylate (HDDA): > 50% by weight
  • Trimethylolpropane triacrylate (TMPTA): ~ 43% by weight
  • Tripropyleneglycol diacrylate (TPGDA): ~ 43% by weight

Application: Omnirad 184 is commonly used for UV-curable clear coatings based on acrylates for various materials such as paper, metal, and plastics. It's especially recommended when UV coatings need to exhibit minimal yellowing even after prolonged exposure to sunlight.

Recommended Addition Levels: The optimal amount of Omnirad 184 varies depending on the desired film thickness, typically ranging from 2 to 4% for film thicknesses of 5 – 20 µm and 1 to 3% for film thicknesses of 20 – 200 µm.

Storage & Handling: Omnirad 184 is sensitive to visible light, so exposure to sunlight should be avoided. It should be stored at temperatures below 35°C, preferably below 30°C, to prevent lumping. Opened packaging should be closed after use to protect against light exposure.

Regulatory Status: Regulatory information can be found on the Material Safety Data Sheet (MSDS) and Regulatory Information Sheet (RIS), available upon request.