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US 5,342,910 AGranted
Process for preparing vinylidene chloride or vinyl chloride polymer by suspension polymerization
AssigneeThe Dow Chemical Company
InventorsSusan M. Kling, Nitis Sarkar
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Abstract
A process for preparing a polymer or copolymer from polymerizable monomers by suspension polymerization whereby foam formation during the removal of residual monomers is inhibited, which process comprises adding at least one salt of an inorganic acid having an anionic valency of at least 2 to the polymer slurry prior to the removal of the residual monomer.
Claims13
A process for preparing a vinylidene chloride polymer or vinyl chloride polymer from polymerizable monomers by suspension polymerization whereby foam formation during removal of residual monomers is inhibited which comprises:
- (A) providing a polymerizable monomer mixture having an aqueous phase comprising a suspending agent and a monomer phase comprising at least one suspension polymerizable monomer;
- (B) polymerizing the polymerizable monomer mixture to form an aqueous slurry of polymer and residual monomer;
- (C) adding at least one salt of an inorganic acid having an anionic valency of at least 2 to the polymer slurry formed after polymerization of the monomer mixture in step (B);
- (D) removing the residual monomer from the polymer slurry containing the salt of an inorganic acid in step (C);
- and
- (E) drying the slurry to form a dry polymer or copolymer.
3 more elements
Dependencies are inferred from the claim text.