HYDROGENATED POLYMERS WITH A RADIAL STRUCTURE HAVING A CORE BASED ON CALIXARENES AND USE THEREOF IN LUBRICANT COMPOSITIONS

摘要

Hydrogenated polymers with a radial structure having a core made up of calixarenes of the general formula (I), to the core of which is linked a number P of hydrogenated linear polymer segments selected from: - hydrogenated homopolymers or copolymers of conjugated dienes; or - hydrogenated copolymers of said conjugated dienes and monoalkenyl arenes, and - mixtures thereof said formula (I) in which: - R1, R2, R3 and R4 are independently selected from hydrogen; a group containing carbon and hydrogen; a group also containing heteroatoms in addition to carbon and hydrogen; a group also containing silicon in addition to carbon, hydrogen and heteroatoms; - one of the two substituents R5 and R6 is hydrogen, while the other may be hydrogen or alkyl, with a number of carbon atoms between 1 and 6, preferably methyl and ethyl; - n is an integer in the range between 4 and 16.