Semipermeable membranes from modified polymers
AssigneeCiba-Geigy Corporation
InventorsHans Batzer, Joel Sinnreich
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Abstract
Polymers from the group consisting of cellulose and its ester and ether derivatives, of polyvinyl alcohol and its ester derivatives, copolymers with vinyl esters and homopolymers and copolymers of acrylates and methacrylates are modified with monofunctional or difunctional cyclic .beta.-ketonic acids or their esters, in particular with succinylsuccinic acid or its ester derivatives. The modified polymers are particularly suitable for obtaining semi-permeable membranes for osmotic separation methods.
Claims15
A semipermeable membrane prepared from a polymer selected from the group consisting of cellulose ester and cellulose ether derivatives, polyvinyl alcohol and ester derivatives thereof, copolymers of polyvinyl alcohol and vinyl esters, copolymers of vinyl esters with one or more .alpha.-olefin comonomers, and homopolymers and copolymers of acrylates and methacrylates, said polymer containing radicals of a cyclic monofunctional or difunctional .beta.-ketonic acid or its esters which are bonded through ester groups.
Dependencies are inferred from the claim text.