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Recent Developments reduce odour in SMA Resins
 

Styrene Maleic anhydride copolymers are crosslinking agents as well as chemical intermediates that find use in powder coating at the maximum level of 10%. They also contribute significantly when used at 5-10% level in water or solvent based coatings.

The aesthetic quality imparted by SMA in coatings cannot be easily matched by other chemical additives or polymers. However, the coating industry finds it difficult to use SMA, particularly in those applications where the inherent smell of SMA due to the presence of acetophenone is very objectionable or irritating. SMA resins have been manufactured from Styrene and Maleic anhydride using an initiator that produces acetophenone as a by-product. Acetophenone, even after removal/extraction, remains at the level of 0.2 - 0.4% in the final products.

A new free radical initiator has been used in a new manufacturing process. The by-products from the free radical initiator form low molecular weight light ends. These light ends having low boiling point are removed, as a result of which the by-products in the final SMA resin can be below 5ppm level.

The irritating odour of acetophenone is absent in the final SMA product. The volatile contents reduce significantly below 0.25% level. The purer SMA resins called SMA-LO available at the same price as the conventional SMA polymers can be used as drop-in replacements of the existing SMA resins.

Powder coating manufacturers would find these new SMA-LO copolymers very attractive for use in Epoxy, Polyester as well as Epoxy hybrid systems.

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