Water-Absorbing Material Having a Coating of Elastic Film-Forming Polymers

A water absorbing material obtainable by a process comprising

• a) spray-coating water-absorbing polymeric particles with an elastic film-forming polymer at temperatures in the range from 0° C. to 50° C. and
• b) heat-treating the coated particles at a temperature above 50° C.

A water absorbing material obtainable by a process comprising

• a) spray-coating water-absorbing polymeric particles with an elastic film-forming polymer in a fluidized bed reactor in the range from 0° C. to 50° C. and
• b) heat-treating the coated particles at a temperature above 50° C.

A water-absorbing material comprising water-absorbing polymeric particles coated with an elastic film-forming polyurethane, wherein the polyurethane comprises not only side chains having polyethylene oxide units but also polyalkylene oxide units in the main chain.

A water absorbing material obtained by a process comprising

• a) spray-coating water-absorbing polymeric particles with an elastic film-forming polymer in a fluidized bed reactor in a continuous process and
• b) heat-treating the coated particles at a temperature above 50° C.