Manufacture of polyvinylpyrrolidone-iodine
AssigneeBASF SE
InventorsKarl Herrle, Walter Denzinger, Kurt Seelert, Wolfgang Schwarz
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Abstract
Polyvinylpyrrolidone-iodine, manufactured by reaction of iodine and a polyvinylpyrrolidone obtained by polymerization in an anhydrous organic solvent in the presence of a source of free radicals and optionally in the presence of a heavy metal of atomic number from 23 to 29, in the form of a complex compound or of a salt with an organic acid, as a co-activator, followed by steam distillation of this polyvinylpyrrolidone, if appropriate. The PVP-iodine of the invention is very stable and can be used as a disinfectant.
Claims9
A polyvinylpyrrolidone-iodine product which has been obtained by a process comprising:
- a. the free radical polymerization of vinylpyrrolidone in a substantially anhydrous organic solvent selected from the group consisting of aromatic hydrocarbons and lower aliphatic monohydric alcohols of 1 to 4 carbon atoms, in the presence of free radicals supplied by an organic per-compound in an amount of about 0.5 to 5 percent by weight on the basis of the weight of the vinylpyrrolidone, and optionally in the presence of a complex salt or organic acid salt of a metal having an atomic number of from 23 to 29 as a co-activator;
- b. mixing the resulting polyvinylpyrrolidone in the form of a powder with iodine in an amount of about 5 to 25% based on the total weight of the polyvinylpyrrolidone-iodine, at about room temperature up to about 50.degree. C.;
- and
- c. heating the resulting mixture for about 5 to 20 hours at about 70.degree. C. to 100.degree. C.
Dependencies are inferred from the claim text.