Process for granulating 2,2,6,6-tetramethylpiperidine-containing light stabilizer
AssigneeSumitomo Chemical Company, Limited
InventorsNorimitsu Numadate, Isao Nakamae, Hiroki Yamamoto, Manji Sasaki
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Abstract
A process for producing granules of a 2,2,6,6-tetramethylpiperidine-containing light stabilizer, which comprises mixing a 2,2,6,6-tetramethylpiperidine-containing light stabilizer having a melting point of not less than 60.degree. C. with a lubricant selected from the group consisting of water and an aqueous solution of an alcohol having 1 to 4 carbon atoms, and granulating the resultant mixture while pressure is applied thereto. The granular light stabilizer product has low dusting property and excellent free-flowing property.
Claims7
A process for producing granules of a light stabilizer selected from the group consisting of bis( 2,2,6,6-tetramethyl-4-piperidyl)sebacate, 2-methyl-2-(2,2,6,6-tetramethyl-4-piperidyl)amino-N-(2,2,6,6-tetramethyl-4 -piperidyl)propionamide and Bis(1,2,2,6,6-pentamethyl-4-piperidyl)-2-(3,5-di-tert-butyl-4-hydroxybenzy l)-2-n-butylmalonate, which comprises mixing the light stabilizer with a lubricant selected from the group consisting of an aqueous solution of methanol and an aqueous solution of isopropyl alcohol, and granulating the resultant mixture while pressure is applied thereto, wherein said light stabilizer has a melting point of not less than 60.degree. C.
Dependencies are inferred from the claim text.