Keycure CAT-8250 CAS NO.108-32-7

Cationics Pis
odonium, (4,-methylphenyl) [4-(2- methylpropyl)phenyl]-, hexafluorophosphate (1-)
especially suitable for the curing of thick and highly pigmented systems.

Keycure CAT-250 is a versatile photoinitiator for cationic polymerization of epoxy, or oxetane-based

photocurable systems upon light exposure. Keycure CAT- 250 can be used to cure effectively cationic

inks & coatings, e.g. printing inks, white base coatings and adhesives.

Keycure CAT-250 is especially suitable for the curing of thick and highly pigmented systems.

Chemacure CAT-8050 may be used, after adequate testing, alone or in combination with suitable

photosensitizers, such as thioxanthones, in UV curable inks and varnishes for application on paper,

metal, wood, plastic materials, and adhesives. When used in combination with ?-hydoxyketones,

excellent surface curing can be obtained at substantially higher line speeds. Imaging applications in

graphic arts (e.g. flexo and screen inks, white base coatings) may be of specific interest. KEYCURE

CAT-8250 is also well suitable for adhesives applications.

KEYCURE CAT-8250 exhibits at low concentrations an outstanding curing performance in highly

pigmented coatings and inks containing rutile titanium dioxide or colored pigments. It affords minimum

yellowing

after exposure to sufficient amounts of UV radiation. In pigmented systems a photosensitizer must be

used in combination with KEYCURE CAT-8250.

Additionally, the outstanding absorption properties of KEYCURE CAT-8250 allow curing of thick

sections in particular when it is used together with the appropriate sensitizer. The amount of KEYCURE

CAT-8250 required for optimum performance should be determined in trials covering a concentration

range.

Recommended applications

White base coatings: 1.5-3%*

Flexo Inks: 1.5-4%*

Screen Inks: 1.5-3%*

Overprint Varnishes 1-1.5%*

Adhesives

*In combination with 0.5-0.7% of a photosensitizer, e.g. thioxanthones