申请人:Luna y Santos Jose A.
公开号:US20080184913A1
公开(公告)日:2008-08-07
Asphalt or bitumen compositions are effectively stabilized against the deleterious effects of heat, light and oxygen, via the incorporation therein of an effective stabilizing amount of one or more sterically hindered amine compounds. The sterically hindered amines are macrocyclic, thermally stable, insoluble in water and have very low vapor pressure. The sterically hindered amines are for instance the cyclic condenstates of N,N′-bis(2,2,6,6-tetramethyl-4-piperidyl)-hexamethylenediamine and 4-tert-octylamino-2,6-dichloro-1,3,5-triazine, of N,N′-bis(2,2,6,6-tetramethyl-4-piperidyl)-hexamethylenediamine and 4-cyclohexylamino-2,6-dichloro-1 ,3, 5-triazine, or of N,N′-bis-(2,2,6,6-tetramethyl-4-piperidyl)hexamethylenediamine and 4-morpholino-2,6-dichloro-1,3,5-triazine. Synthetic rubber modified asphalt or bitumen may also be stabilized via incorporation of these hindered amines. The hindered amines may be present in the asphalt or bitumen or the rubber, or may be present in each of the asphalt, bitumen and rubber.