Sandwich construction and a method of making a sandwich construction Patent #: 4826723
ApplicationNo. 225204 filed on 07/28/1988
US Classes:428/315.5, Voids specified as micro428/315.9, Composite has more than two layers428/316.6, Plural void-containing components428/317.1, With component specified as adhesive or bonding agent428/913, MATERIAL DESIGNED TO BE RESPONSIVE TO TEMPERATURE, LIGHT, MOISTURE, ETC.604/368, Collagen or gelling material604/369Foam or cellular structure material
ExaminersPrimary: Van Balen, William J.
Attorney, Agent or Firm
International ClassesB32B 003/26
Foreign Application Priority Data1987-07-29 GB
AbstractWater absorbent structures are disclosed which are intended for use as wound dressings, disposable nappies (diapers) or similar applications. The structures comprise a flexible porous substrate, e.g. an open-cell foam web which is impregnated with (a) a solid, water-insoluble water absorber which has a fine particle size and is capable of absorbing at least 30 times its weight of water and (b) a hydrophilic binder which retains the water absorber in the substrate and comprises a substantially non-cross-linked, water-insoluble, hydrogel forming polymer.Component (a) has a high affinity for water due to the presence of hydrophilic groups in the polymer, but is insoluble in water and in common organic solvents. Component (b) is also water-insoluble, but because of its non-cross-linked structure is soluble in common organic solvents, such as ethanol.