Solvent-free, fine white powders of a copolymer of maleic anhydride and A C1-C4 alkyl vinyl ether substantially free of poly (alkyl vinyl ether, homopolymer
AssigneeISP Investments Inc.
InventorKrystyna Plochocka
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Abstract
Solvent-free, fine white powders of a copolymer of maleic anhydride and a C1-C4 alkyl vinyl ether substantially free of poly(alkyl vinyl ether) homopolymer.
Claims9
Solvent-free, fine white powders of a copolymer of maleic anhydride and a C1-C4 alkyl vinyl ether substantially free of poly(alkylvinyl ether) homopolymer.
A solvent-free process for making fine white powders of a copolymer of maleic anhydride and an alkyl vinyl ether substantially free of poly(alkyl vinyl ether), by copolymerization of maleic anhydride (MAN) and excess alkyl vinyl ether (AVE) monomers and a free radical initiator to promote radical copolymerization of said monomers, which comprises including in the reaction mixture an effective amount of water as a suppressor agent sufficient to preclude cationic homopolymerization of alkyl vinyl ether monomer into poly(alkyl vinyl ether) homopolymer, said amount being about 500 to about 5000 ppm.
Dependencies are inferred from the claim text.