Patent ID: 7659417

Claim:
A compound of the formula below where: the symbol R 1 represents hydrogen, or a monovalent hydrocarbon chosen from a linear or branched alkyl radical having from 1 to 4 carbon atoms and a linear or branched alkoxyalkyl radical having from 2 to 8 carbon atoms; the symbols R 2 and R 3 , which are identical or different, each represent a linear or branched alkyl radical having from 1 to 6 carbon atoms, an aryl radical having from 6 to 18 carbon atoms; an arylalkyl radical or an alkylaryl radical, where in said arylalkyl radical or said alkylaryl radical the aryl portion of the radical comprises C 6 -C 18 aryl and the alkyl portion comprises C 1 -C 6 alkyl; and x=an integer or fraction ranging from 1.5 to 10.