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US 4,789,716 AGranted
Method of manufacturing polymaleic anhydride powders
AssigneeHuls Aktiengesellschaft
InventorBernhard-Peter Scholz
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Abstract
A method of manufacturing pulverulent polymaleic anhydrides in which maleic anhydride is polymerized in an organic solvent in the presence of a dispersant. Polymerization results in high yields of polymaleic anhydride, as a colorless or faintly colored powder.
Claims14
A method of manufacturing pulverulent polymaleic acid anhydride, comprising the steps of:
- (i) polymerizing a solution of maleic anhydride in an aromatic organic solvent in the presence of a radical-forming compound and a dispersing agent to produce powdered polymaleic acid anhydride;
- and
- (ii) separating out said powdered polymaleic acid anhydride.
Dependencies are inferred from the claim text.