Patent ID: 8703671

Claim:
A continuous process for preparing a urea grease comprising: providing an apparatus comprising an extruder and a plurality of zones arranged in series and in fluid communication, wherein the plurality of zones comprise (a) a first feeding zone; (b) a second feeding zone; (c) a first reacting-mixing zone; and (d) a cooling-mixing zone, and wherein the zones are in the order (a), (b), (c), (d); introducing a first feed component to the first feeding zone (a), wherein the first feed component comprises a diisocyanate; introducing a second feed component to the second feeding zone (b), wherein the second feed component comprises at least one component selected from the group consisting of: a monoamine, a diamine, an alcohol, and a combination thereof; allowing the first feed component and the second feed component to react and mix within the first reacting-mixing zone (c); allowing the output from the first reacting-mixing zone (c) to be cooled and mixed within the cooling-mixing zone (d); and thereby obtaining the urea grease.