Photoinitiator 127 (CAS:474510-57-1)

General

PHOTOINITIATOR 127 is a highly efficient UV curing additive which is used to  initiate the photopolymerisation of reactive prepolymers - e.g. acrylates  - in combination with mono- or multifunctional monomers. PHOTOINITIATOR 127 is completely aligned with market requirements in  terms of productivity and emission. 

This new photo-initiator is  remarkable by its: 

- excellent reactivity i.e. superiority over conventional a-Hydroxyketones like PI 184 or PI 1173; 

- low sensitivity to oxygen inhibition; 

- low emission and odor after curing. 

PHOTOINITIATOR 127 is especially suitable for all types of pigmented UV-inks  (offset, screen, flexo and Ink Jet) and Clear coatings, in particular in  thin coatings like overprint varnishes but also in a variety of coating  applications.

Chemical Structure

2-Hydroxy-1-{4-[4-(2-hydroxy-2-methyl-propionyl)-benzyl]-phenyl}-2- methyl-propan-1-one 

Molecular weight: 

340.4 

CAS-No. 

474510-57-1

Absorption Spectrum (% in Acetonitrile)

Physical Properties

Appearance:           off-white powder 

Melting point:        82-90°C (strongly dependent on measurement conditions)

Solubility at 22°C (g/100 g solution): 

PI 1173                                                  40 % 

tripropyleneglycol diacrylate (TPGDA) 15 % 

TMPTA                                                  15 % 

EBECRYL 160                                        15 % 

OTA 480                                               >15 % 

DPHA                                                   5 %

Application 

PI 127 may be used after adequate testing alone or in combination with suitable co-initiators, such as PI 379, PI 819 for UV curable inks and in coating formulations for  applications on paper, wood, metal and plastic materials. Its red-shifted  absorption spectrum makes it especially suitable for UV curable inks and  in general semi opaque systems. In these applications it delivers properties like very high cure speed and  low odor. In UV curable inks it gives (in combination with other photoinitiators) outstanding surface cure properties. Low sensitivity to oxygen inhibition associated with reduced emission  are of particular interest for overprint varnishes and for top coats for  wood parquets.

In UV curable cationic inks and coatings the use of PI 127 as a  co-initiator together with e.g. PI 250 has been demonstrated  to result in an exceptionally high-performance formulation. The amount of PI 127 required for optimum performance  should be determined in trials covering a concentration range.

Safety and Handling

 PI 127 should be handled in accordance with good industrial  practice. Detailed information is provided in the Safety Data Sheet. PI 127 is slightly sensitive to visible light and exposure to  sunlight should be avoided. Opened bags should be closed immediately after use to protect the product against light.