Diblock copolymers prepared by cross metathesis

Abstract

This invention relates to a composition comprising a multiblock polyolefin represented by the formula: PO—C(R)(R)—C(R)═C(R)—C(R)(R)—PO*, or isomers thereof, wherein R, R, R, R, R, and R, are each independently a substituted or unsubstituted Cthrough Chydrocarbyl group or a hydrogen; PO and PO* are polyolefins; PO and PO* are each independently a substituted or unsubstituted hydrocarbyl group having 9 to 4000 carbon atoms, provided that at least one of PO and PO* are Cor greater, said polyolefin having: 1) an internal unsaturation as shown by theC NMR peak at between about 128 and about 132 ppm; 2) an Mn ratio 'Z'=0.1 to 10 where Z is the Mn (as determined byC NMR) divided by Mn (as determined according to Gel Permeation Chromotography using polystyrene standards); and 3) optionally, from 0.3(J) and 0.75(J) internal unsaturations per 1000 carbons as determined byH NMR spectroscopy, where J is the number of reactive groups per 1000 carbons for the mixture of vinyl terminated polyolefins that become PO and PO*, before they are coupled by an alkene metathesis catalyst.