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A water absorbent water insoluble polymeric element, such as fibre, film, coating, bonding layer or foam, is made by forming a substantially linear polymer by polymerization of water soluble ethylenically unsaturated monomer blends comprising carboxylic and hydroxylic monomers and then reacting the

A water absorbent water insoluble polymeric element, such as fibre, film, coating, bonding layer or foam, is made by forming a substantially linear polymer by polymerization of water soluble ethylenically unsaturated monomer blends comprising carboxylic and hydroxylic monomers and then reacting the carboxylic and hydroxylic monomers in the linear polymer to form internal cross links within the polymer.

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A water absorbent, water insoluble, polymeric element that has a gel capacity of at least 50 grams deionized water per gram dry polymer and that has been made by a process comprising the steps of (a) providing a substantially linear polymer that has been made by polymerization of a water soluble eth

A water absorbent, water insoluble, polymeric element that has a gel capacity of at least 50 grams deionized water per gram dry polymer and that has been made by a process comprising the steps of (a) providing a substantially linear polymer that has been made by polymerization of a water soluble ethylenically unsaturated monomer blend comprising at least 50% by weight monomer that provides carboxylic acid groups and 0.1 to 15% by weight monomer that provides hydroxyl groups that can react with the carboxylic acid groups to form ester cross linkages that contain only carbon and oxygen atoms in the linkages, (b) shaping a solution of the polymer by a shaping step selected from extrusion, coating, impregnation and foaming to shape the linear polymer into the shape of the desired element and then (c) heating the shaped element to cause the said carboxylic and hydroxylic groups to react in the shaped element to form the said cross linkages.