| 摘要 |
<p>The invention relates to the preparation of .alpha., .beta.-un-saturated carboxylic acid N-substituted-amides, polymers thereof and the use of these polymers as sedimentation, flocculating, dewatering and retention aids, as additives for mineral oils, and as ion exchangers. The .alpha., .beta.-unsaturated carboxylic acid N-substituted-amides are prepared by transamidation of .beta.-hydroxy or .beta. -alkoxy-carboxylic acid amides with primary amines and heating of the resulting .beta. -hydroxy- or .beta.-alkoxy-carboxylic acid N-substituted-amides in the vapor phase in the presence of catalysts. Primary amines are preferably used for the transamidation which have no hydrogen beta to the amino group. These .alpha.,.beta.-unsaturated carboxylic acid amides may be neutralized and/or quaternized and polymerized alone or with other comonomers, and preferably acrylic or methacrylic acid derivatives such as acrylamide, to give cationic polymers. These polymers are suite for use as flocculating and sedimentation aids, as dewatering and retention aids in paper-making, as additives for mineral oils, and as ion exchangers.</p> |
