ESACURE Photoinitiators

Ciba Speciality Chemicals, Inc. (Darocur, Irgacure, http //www.cibasc.com) and Sartomer (distributor of Lamberti S.p.A. Esacure photoinitiators, http //www.sartomer.com, http //www.esacure.com) are significant supphers of photoinitiators. Ciba Specialty Chemicals snpplies alkoxyamines (Chimas-sorb). Nitroxyl radicals are available from Aldrich and Degussa-Hiils. Sales figures on photoinitiators are not readily available. The market for these initiators has been reviewed (240). Becanse most of the consmnption of organic peroxides and azo initiators is in the developed conntries, market growth in 2000 and beyond is expected to be modest, ie, 2-3% annually. 

Real-Time FTIR. For our IR studies, we utilized a stoichiometrically equivalent amount of a trifunctional thiol, trimethylolpropane tris(2-mercaptoacetate), with a difunctional allyl, trimethylolpropane diallyl ether. The thiols were protected from oxidative polymerization by the addition of hydroquinone. The monomers and hydroquinone were purchased from Aldrich Chemicals and were used as received. This formulation was mixed for five minutes and then a commercial photoinitiator, Esacure TZT (Sartomer Inc.), which contained a blend of methyl benzophenones, was added at a level of 1.0% by weight of monomers to the formulation. Stirring was maintained for a further five minutes following the addition of the photoinitiator. The final formulation contained 2.0% by weight of hydroquinone. The samples were prepared prior to each experiment in order to ensure reproducibility of sample history. 

Thus, a semilogarithmic plot of the gel time as a function of 1/T should be linear, with the slope corresponding to the apparent activation energy. We have determined the gel times for a temperature range of 25°-50° C for a thiol-ene system consisting of stoichiometrically equivalent amounts of a trifunctional thiol, trimethylolpropane tris(2-mercaptoacetate), and a trifiinctional allyl monomer, triallyl isocyanurate. In this system, we also added 0.31% by weight of hydroquinone, to prevent premature polymerization, and 1.0% by weight of a commercial photoinitiator, Esacure TZT. 

CAS 163702-01-0 EINECS/ELINCS 402-990-3 Uses Photoinitiator for fiber optics, packaging, coatings Features Nonyellowing, low volatility Properties Orange-yel. semi-solid low odor b.p. > 200 C Esacure KIP EM [Lamberti]... 

Chem. Descrip. Esacure KIP150 (polymeric hydroxy ketone), Esacure TZT (trimethylbenzophenone blend), and TPO blend Uses Photoinitiator for wood coatings and inks, clear and wh. pigmented coatings... 

Benacure BP Diaryl iodonium hexafluoroantimonate 2,2-Dimethoxy-2-phenylacetophenone, Esacure KB1 Esacure KB45 Esacure KB60 Photomer 64 Sarcure SR1121 SR-1010 SR-1011 SR-1012 photoinitiator, plastics coatings SarCat K185 photoinitiator, polymers Ecco Catalyst RC-99 photoinitiator, PVC floor coatings... 

Photoinitiator Esacure KB 1 is a crystalline powder of benzildimethyl ketal, which is readily soluble in most organic solvents, monomers and photoreactive polymers. The optimum absorption is at 250-350 nm. It has fast cure response and good through cure. 

A blend of components noted, which enables generation of free radicals by the hydrogen-abstraction mechanism, giving fast surface cure speed. Esacure X33 is a liquid photoinitiator which can be easily incorporated by simply stirring into your resin system. 

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