Membrane-forming polymeric systems
AssigneeCiba-Geigy Corporation
InventorPing I. Lee
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Abstract
Membrane-forming polymeric systems comprising the molecular association product of a polymeric carboxylic acid having at least 10% of the monomer units containing free carboxylic groups with an ethoxylated nonionic surfactant; methods for the preparation of such polymeric systems; and a broad range of applications for such systems with particular emphasis on the release of diverse active agents at a continuous and controlled rate.
Claims9
Seed coated with a polymeric system comprising an association product of a polymeric carboxylic acid having free carboxyl groups on at least 10% of the monomer units thereof and an ethoxylated nonionic surfactant having at least 2 ethylene oxide units, a maximum molecular weight of 4,000 and a HLB (hydrophile-lipophile balance) value of 2 to 40.
Dependencies are inferred from the claim text.