Process for the preparation of polyalkenyl succinic anhydrides

Details Process for the preparation of polyalkenyl succinic anhydrides Process for the preparation of polyalkenyl succinic anhydrides

2011-03-01

2011-03-01

Rabago, Roberto (Department: 1762)

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C525S356000, C525S357000, C525S375000, C525S379000, C525S381000, C525S382000, C525S386000, C528S486000, C508S232000, C508S235000

Reexamination Certificate

active

07897696

ABSTRACT:
A polyalkenyl succinic anhydride is prepared with low amounts of resinous or chlorinated byproducts in a two-step process whereby a polyalkene is first reacted with an unsaturated organic acid in a thermal ene reaction, followed with exposure to a gaseous halogen in presence of an additional amount of the unsaturated organic acidic reagent. The foregoing process produces a polyisobutenyl succinic anhydride having a high ratio of succinic anhydride functional groups to polyisobutenyl backbone groups. Such a polyisobutenyl succinic anhydride is particular suitable for the production of oil-soluble hydrocarbyl succinimides that have good dispersant properties when added to lubricating oil compositions.

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