Reaxis^®  C319

• Product Category Organotin

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• Chemical Name Dibutyltin Dilauryl Mercaptide

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• CAS Number 1185-81-5

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• TSCA (US) Yes

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• DSL (Canada) Yes

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• AICS (Australia) Yes

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• KECI (South Korea) Yes

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• IECSC (China) Yes

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• ENCS (Japan) Yes

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• TCSI (Taiwan) Yes

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• NZloC (New Zealand) Yes

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• PICCS (The Philippines) Yes

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• NDSL (Canada) No

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• REACH (EU) No

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Unlike standard organotin carboxylates, sulfur-bearing organotins are primarily used as a catalyst for polyurethanes. Catalysts such REAXIS^® C319, tend to be inactive in regard to reactivity when used in silicone and esterification related applications.As the sulfur ligand acts as a blocking agent, thermal deblocking is required to initiate the back-end cure. Thus, catalysts such as REAXIS^® C319 tend to perform best in adhesive, elastomer, and foam applications with adequate exotherms. For coatings applications, REAXIS^® C319 can be used in baked cured systems in contrast to ambient cured systems. 

As is typical of most organotin and inorganic tin catalysts, the specific ligand contributes a major influence on overall reactivity. This is specifically highlighted in regard to sulfur- bearing ligands. In general, these sulfur ligands impart improved front-end delay and hydrolytic stability versus standard tin carboxylates. Standard ligands include thiols, mercaptides and mercaptoacetates. Reactivity as defined by delay, thermal availability, hydrolytic stability, and final cure will depend on the specific ligand, tin content, alkyl group and, most importantly, other raw materials used in the specific polyurethane formulation. In regard to reactivity of the various urethane reactions, catalysts such as REAXIS^® C319 will selectively catalyze the isocyanate-polyol reaction, with less of an effect on the water reaction. Given its synthetic nature, REAXIS^® C319 imparts minimal color at higher temperatures.  

Packaging

• 44 lb (20 kg) plastic pail
• 440 lb (200 kg) steel drum

Storage

REAXIS^® C319 should be stored in the original packaging at moderate temperatures and kept from freezing. The container should be closed tightly after each use to maximize shelf life. Characteristic of most Sn (IV) organotins, the primary cause of instability would be hydrolysis. Although more stable compared to organotin carboxylates, long term contact with moisture could result in hydrolysis with the formation of tin oxide insolubles leading to deactivation of REAXIS^® C319. 

Before use of Reaxis products please refer to the relevant Safety Data Sheet (SDS) for safety and toxicological data as well as for the information on proper transportation, storage, and use. SDSs are available by request via our web site reaxis.com, contacting your local representative, or emailing direct to techservices@reaxis.com.