wherein Ra is a monovalent hydrocarbon group having at least 2 carbon atoms, Rb is an alkyl group having 1 to 4 carbon atoms, Rc to Re are each independently an aryl group having 6 to 25 carbon atoms, {HEAD ~ an alkyl group} having {TAIL ~ 1 to 20 carbon atoms} or a monovalent hydrocarbon group having at least 2 carbon atoms, o is 3 to 6, p is 1 to 3, and q is 1 to 10 
having
wherein Ra is a monovalent hydrocarbon group having at least 2 carbon atoms , Rb is an alkyl group having 1 to 4 carbon atoms , Rc to Re are each independently an aryl group having 6 to 25 carbon atoms , { HEAD ~ an alkyl group } having { TAIL ~ 1 to 20 carbon atoms } or a monovalent hydrocarbon group having at least 2 carbon atoms , o is 3 to 6 , p is 1 to 3 , and q is 1 to 10
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH