Patent ID: 9481841
Filing Date: 2016-11-01
CPC Classification: C08F,C08L,C10L,C10M,C10N

Claim Text:
1. A process for preparing an additive comprising the steps of: (1) reacting a polymer derived from an olefin containing 2 to 8 carbon atoms with an acylating agent to form an acylated polymer, wherein the acylating agent is an alpha, beta-unsaturated mono- or polycarboxylic acid, anhydride, ester or derivative thereof; and (2) reacting the acylated polymer of step (1) with ammonia or an amine in a medium that is an aliphatic hydrocarbon oil of lubricating viscosity having a sulphur content of less than 25 ppm and a flash point of 105° C. or higher to form a succinimide product; wherein the mole ratio of the acylating agent to polymer in step (1) is from 1:1 to 1.4:1 and the reaction is carried out in the absence of the halogen chlorine; wherein the acylated polymer in step (1) contains less than 20 mole % of unreacted polymer; wherein the acylated polymer of step (1) contains 60 wt % or more as a mono-substituted acylated polymer; and wherein the ratio of amine nitrogen groups to acylated polymer carbonyl groups of the succinimide product is 1.3:1 to 2.7:1.