Patent ID: 6156850
Filing Date: 2000-12-05
Classification: C08F

Abstract:
A process for the preparation of a polyalkenyl derivative of an unsaturated acidic reagent, said process comprising the steps of:(a) reacting a polyalkene having a Mn of at least 300 with an unsaturated acidic reagent at elevated temperatures in the absence of a strong acid until at between 25% and 80% of the polyalkene is converted to a polyalkenyl derivative of an unsaturated acidic reagent;(b) continuing the reaction of said polyalkene with an excess of said unsaturated acidic reagent at elevated temperatures in the presence of a strong acid to convert at least some of the unreacted polyalkene to additional polyalkenyl derivative of an unsaturated acidic reagent; and(c) removing the unreacted unsaturated acidic reagent.