Process for preparing polyalkenylsuccinimides

Details Process for preparing polyalkenylsuccinimides Process for preparing polyalkenylsuccinimides

2006-08-15

2006-08-15

Hightower, P. Hampton (Department: 1711)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

C528S332000, C528S335000, C528S336000, C528S363000, C525S181000, C525S183000, C525S285000, C525S301000, C525S329500, C525S418000, C525S419000, C525S420000, C524S745000

Reexamination Certificate

active

07091306

ABSTRACT:
The present invention relates to an improved process for preparing polyalkenylsuccinimides having a sediment level less than 0.1 vol % comprising the steps of:(a) preparing a polyalkenyl derivative of an unsaturated acidic reagent by(i) reacting a polyalkylene with an unsaturated acidic reagent in the absence of a strong acid until at least 25% of the polyalkylene is converted to a polyalkenyl derivative of an unsaturated acidic reagent;(ii) continuing the reaction with an excess of the unsaturated acidic reagent in the presence of a strong acid to convert at least some of the unreacted polyalkylene to additional polyalkenyl derivative of an unsaturated acidic reagent; and(iii) removing the unreacted unsaturated acidic reagent;(b) reacting the unfiltered product of step (a) with a polyamine having at least one basic nitrogen atom;(c) diluting the product of step (b); and(d) subsequently filtering the polyalkenylsuccinimide product.

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