Product introduction
Photoinitiator 1173 is a liquid type, non-yellowing photoinitiator. First proposed by Merck in the 1980s, the original name was
DAROCUR 1173. Good solvency makes it ideal for making photoinitiator mixtures. It is crafted for wood, metal and plastic, as well as
First choice for UV curable adhesive inks.

physical parameters
structure:

Chemical name: 2-Hydroxy-2-methyl-1-phenyl-propan-1-acetone (2-hydroxy-2-methylphenone)
CAS No. : 7473-98-5
EINECS No. : 231-272-0
Molecular formula: C10H12O2
Molecular weight: 164.2
Appearance: Colorless to pale yellow clear liquid
Odor: very faint
Melting point: ca. 4 °C
Boiling point: 80-81℃@1 mmHg, 250℃@760 mmHg
Specific gravity: 1.074 @20℃

Soluble
Insoluble in water, soluble in most organic solvents; compatible with most unsaturated prepolymers, resins and monomers used in the UV curing industry.

Specification
Appearance: light yellow clear liquid
Assay : 98.0% min.
Determination Boiling Point: 105 - 115℃ @3 - 5 torr
Volatile content: up to 0.5%
Solubility: Clear

application
Under the irradiation of ultraviolet light, the photoinitiator 1173 undergoes isolysis and intramolecular destruction to generate a pair of free radicals, thereby initiating the polymerization of the ultraviolet curing system. It doesn't need a hydrogen donor to start its free radicals. But its free radicals are very sensitive to oxygen in the air. It was the first initiator for non-yellowing clear coatings. Since it is a liquid type and has good dissolving power, it is easy to handle and formulate. It uses unsaturated acrylic monomers as reactive diluents to initiate system polymerization. The usage rate of photoinitiator 1173 varies depending on system composition, light source, line speed and film thickness, but is typically between 0.5% and 5% w/w. The addition of photosensitizers such as ITX and DETX can greatly increase the curing speed. Photoinitiator 1173 can be used in printing inks, solder resists; overprint varnishes and wood paints, adhesives and photoresist dry films.

Storage conditions
Must be stored in a closed container in a dark, dry place.

Package
25kg plastic drum/200kg iron drum.