Ciba Specialty Chemicals Coating Effects Segment

Ciba

® IRGAFOS

® 168 Processing Stabiliser

Edition 31.05.2005 © 2005 Ciba Specialty Chemicals Inc. Page 1 of 3

General

IRGAFOS 168 is a trisarylphosphite processing stabiliser. It is a highly effective, low-volatile and hydrolysis resistant antioxidant for coating resins. It protects the resin polymer against oxidation during resin synthesis, manufacturing of the paint, processing (thermal curing and overbaking) and the designed life-time of the final coating. IRGAFOS 168 provides excellent protection against discolouration and change of physical properties caused by excessive heat exposure.

Chemical Structure

O)3P

Tris (2,4-di-tert-butylphenyl)phosphite; Molecular Weight: 646.9 CAS Number: 31570-04-4

Physical Properties (typical values)

IRGAFOS 168 is offered in two different product forms:

Appearance : white powder IRGAFOS 168 white free-flowing powder IRGAFOS 168 FF Melting point : 185°C Solubility (g/100g solution) at 20°C :

Acetone Cyclohexane Hexane Ethanol Methanol Ethyl acetate Toluene Water

1 10 11 0.1 < 0.01 4 30 < 0.01 (degradation)

Applications IRGAFOS 168 provides outstanding thermal and colour stability to a variety of coating resins upon exposure to high temperatures during synthesis and subsequent processing. It is particularly suited to stabilise alkyd and polyester resin based coating systems that are used in applications such as • industrial powder coatings (electrical and gas oven heating) • coil coatings • other industrial high bake coatings

A special feature of the IRGAFOS 168 phosphite stabiliser is its

Ciba ® IRGAFOS

® 168

Processing Stabiliser

Edition 31.05.2005 © 2005 Ciba Specialty Chemicals Inc. Page 2 of 3

efficiency in presence of NOx gases and thus its potential to function in critical gas oven curing conditions. In electrical ovens and gas fired ovens where the coated substrates being exposed to only very low NOx concentrations, a combination IRGAFOS 168 with hindered phenolic antioxidants such as IRGANOX 1076 or IRGANOX 1010 typically leads to a synergistic performance improvement. In the presence of NOx the same combination often exhibits adverse discolouration effects, however. In this case phenol-free synergistic antioxidant systems can be obtained by using IRGAFOS 168 in combination with hindered amine light stabilisers (HALS) such as TINUVIN 111 FD, TINUVIN 292 or TINUVIN 622 LD. For improved performance IRGAFOS 168 may also be combined with other phosphite or phosphonite co-stabilizers such as IRGAFOS 38, IRGAFOS XP 40 and IRGAFOS XP 60 or with thiosynergists such as IRGANOX PS 800. The amount of IRGAFOS 168 required for optimum performance should be determined in trials covering a concentration range.

Recommended concentration: (based on resin solids) • industrial powder coatings • coil coatings • other industrial high bake

coatings

0.2 - 0.8% IRGAFOS 168 alone or in combination with synergists

Safety and Handling IRGAFOS 168 is sensitive to moisture. Commercial quantities are offered in special metalised plastic inner packagings to prevent hydrolysis of the product upon storage. To ensure optimum performance, opened packages and small samples should be used up without delay and care taken to avoid exposure to moist environments. IRGAFOS 168 should be handled in accordance with good industrial practice. Detailed information is provided in the Safety Data Sheet.

Trademark IRGAFOS and IRGANOX are registered trademarks.

Important Notice 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

Ciba ® IRGAFOS

® 168

Processing Stabiliser

Edition 31.05.2005 © 2005 Ciba Specialty Chemicals Inc. Page 3 of 3

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.