| 摘要 |
<p>PCT No. PCT/EP94/00490 Sec. 371 Date Aug. 24, 1995 Sec. 102(e) Date Aug. 24, 1995 PCT Filed Feb. 21, 1995 PCT Pub. No. WO94/20549 PCT Pub. Date Sep. 15, 1994Polyvinylpyridine N-oxides are prepared by oxidizing polyvinyl-pyridines with aqueous solutions of hydrogen peroxide in the presence of acids and oxides or acids of elements of Groups 5b, 6b, 7b and 8 of the Periodic Table or of salts of these acids as catalyst, it also being possible for the oxidation to take place in the absence of the catalysts when from 40 to 80% strength aqueous solutions of at least dibasic carboxylic acids or of polymers of monoethylenically unsaturated carboxylic acids are used as solvent.</p> |
