Patent ID: 9255236
Filing Date: 2016-02-09
CPC Classification: C07C,C07D,C10L,C10M,C10N

Claim Text:
1. A method for reducing or preventing deposits in an injection system of a diesel engine, the method comprising adding a deposit reducing or deposit preventing effective amount of a quaternized nitrogen compound to a diesel engine in need thereof, wherein said quaternized nitrogen compound is a quaternized nitrogen compound prepared by a process comprising: a) reacting an anhydride compound derived from a polycarboxylic acid, or a dimeric form thereof having two acid anhydride groups, with a compound comprising (i) a group comprising oxygen or nitrogen wherein the group is reactive with an anhydride, and (ii) a quaternizable amino group, to form a product, and b) quaternizing the product from a) to obtain the quaternized nitrogen compound, wherein the anhydride compound comprises a hydrocarbyl substituent having a number-average molecular weight (Mn) in a range from about 200 to 20 000; wherein the quaternized nitrogen compound has a formula selected from the group consisting of formulae Ia-1, Ia-2, Ia-3, Ib-1, Ib-2 and Ib-3: in which R R R at least one of R R L L