Patent ID: 6534675
Filing Date: 2003-03-18
Classification: C07C

Abstract:
A process for the preparation of zinc dithiocarbamates of the formula wherein R1 and R2 are identical or different and represent a C1-C6-alkyl or C7-C12-aralkyl radical, or wherein R1 and R2 are bridged by polymethylene chains having from 2 to 12 methylene segments, it being possible for the polymethylene chains to be interrupted by from 1 to 3 hetero atoms, wherein said process comprises the following steps in sequence of: (i) adding zinc salts, in aqueous solution, to secondary amines underlying the zinc carbamates, (ii) forming an aqueous suspension of zinc salt complex of the secondary amines, and (iii) introducing carbon disulfide and sodium hydroxide solution, with stirring, into said aqueous suspension, whereby the temperatures are maintained in the range from room temperature to the boiling temperature of carbon disulfide until the reaction has completely finished and wherein said zinc dithiocarbamates have a homogeneous particle size distribution.