Method for producing powdered polylauryl-lactam coating...

Details Method for producing powdered polylauryl-lactam coating... Method for producing powdered polylauryl-lactam coating...

C - Chemistry, Metallurgy

08

J

402/228, 400/780

C08J 3/12 (2006.01) C08G 69/46 (2006.01)

Patent

CA 1127348

ABSTRACT The invention relates to a method for producing powdered polylauryl- lactam, material for use in the hot-coating of metals based upon polylauryl- lactam, starting from granular polylauryl-lactam material obtained by polymorizing lsuryl-lactam, under its own pressure, in the presence of between 2 and 10% by weight of water and between 0.3 and 0.7% by weight of phosphoric acid, at temperatures between 265 and 300°C, and in the absence of chain stabilizers, the granular material having a viscosity nrel of between 1.50 and 1.80. After pre-cooling at temperatures of between -50 and 0°C, the granular material is ground and then graded. Prior to grinding, extraction is carried out with methanol or ethanol. Pigments are added to the monomer lauryl-lactam, or to the polylauryl-lactam, before granulating. The powders are particularly suitable for the production of coloured powders by the "dry-blend method".

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