| 摘要 |
<p>Polymeric material comprising at least four polymeric constituents which comprise mer units of the following types: I acrylamide or derivatives thereof II acrylonitrile or derivatives thereof III acrylic acid and esters, or derivatives thereof IV alkylol, sulphonyl or phosphonyl derivatives of I. The polymeric materials are useful as components of water bearing systems which are in the form of gels or suspensions.</p> |
