Keycure CAT-8250

KEYCURE CAT-8250 is a versatile photoinitiator for cationic polymerization of epoxy, or oxetane-based photocurable systems upon light exposure. KEYCURE CAT-8250 can be used to cure effectively cationic inks & coatings, e.g. printing inks, white base coatings and adhesives. KEYCURE CAT-8250 is especially suitable for the curing of thick and highly pigmented systems.

Iodonium, (4-methylphenyl)[4-(2-methylpropyl) phenyl]-, hexafluorophosphate(1-)

KEYCURE CAT-8250 is a 75% solution of the active substance in propylene carbonate.

CAS No.

：

344562-80-7

Molecular Weight:

：

496.2

Appearance:yellow to brownish liquid (solution)

Solids content:75% (w/w)

Viscosity:1385 mm2/s at 20 0C, 480 mm2/s at 30 0C

Density: 1485 kg/m3 at 24 0C

(% in Acetonitrile)

KEYCURE CAT-8250 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 a-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.

White base coatings: 1.5-3%*

Flexo Inks: 1.5-4%*

Screen Inks: 1.5-3%*

Overprint Varnishes 1-1.5%*

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

KEYCURE CAT-8250 should be handled with care in accordance with good industrial practice. Detailed information is provided in the Safety Data Sheet. A component in KEYCURE CAT-8250 is a strong skin sensitizer and can induce an allergic reaction. Therefore any skin contact and other types of exposure should be strictly avoided. Use protective clothing, gloves and face protection, if exposure is possible. Also consider technical measures to avoid or reduce exposure during transport, use, cleaning and disposal.

In the presence of certain vinylethers, the stability of KEYCURE CAT-8250 can be negatively affected if the formulation is exposed to elevated temperatures. Therefore avoid higher temperatures or make pre-checks with small quantities of your specific formulation.

Do not discard KEYCURE CAT-8250 in the environment. In case of an unintended spillage use a water-free absorbant like UNI-Safe or Florideal to bind the material for approximately one hour. Store the material in a metal free container, which can be closed properly, and get it burned.

KEYCURE CAT-8250 is sensitive to visible light and any exposure to sunlight should be avoided. Opened containers should be closed after use to protect the product against light and moisture.

IMPORTANT: The following supersedes Buyer’s documents. SELLER MAKES NO REPRESENTATION OR WARRANTY, EXPRESS OR IMPLIED, INCLUDING OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. No statements herein are to be construed as inducements to infringe any relevant patent. Under no circumstances shall Seller be liable for incidental, consequential or indirect damages for alleged negligence, breach of warranty, strict liability, tort or contract arising in connection with the product(s). Buyer’s sole remedy and Seller’s sole liability for any claims shall be Buyer’s purchase price. Data and results are based on controlled or lab work and must be confirmed by Buyer by testing for its intended conditions of use. The product(s) has not been tested for, and is therefore not recommended for, uses for which prolonged contact with mucous membranes, abraded skin, or blood is intended; or for uses for which implantation within the human body is intended.