HYDROGENATED POLYMERS WITH A RADIAL STRUCTURE HAVING A CORE BASED ON CALIXARENES AND USE THEREOF IN LUBRICANT COMPOSITIONS
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United States of America Patent
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May 21, 2020
app pub date -
Jan 27, 2020
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Apr 17, 2014
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Abstract
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 co-polymers of conjugated dienes; or —hydrogenated co-polymers 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.
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