Absorbent structures with integral layer of superabsorbent polymer particles

DETAILED DESCRIPTION OF THE INVENTION All patents, patent applications and references cited herein are hereby incorporated by reference in their entirety.
In case of any inconsistency, the present disclosure governs.
The present invention relates to a superabsorbent roll good suitable for use in disposable absorbent products, which contains a distinct superabsorbent layer comprising bonded superabsorbent polymer particles.
Typically, the layer of superabsorbent particles is bonded to the surface of a fibrous absorbent layer, such as for example an air laid nonwoven.
When used in a disposable absorbent product, such as a diaper or a feminine hygiene product, the superabsorbent layer of the invention is bonded to a fibrous absorbent layer and is located on that surface of the product, which is intended to be away from the wearer of the absorbent product.
The superabsorbent layer of the invention comprises superabsorbent polymer particles and a water soluble or a water dispersible polymeric binder.
The superabsorbent layer does not normally contain any added fibers, but may contain those which may have been normally protruding from the plane of the surface of the fibrous structure and those around depressions in the surface into which superabsorbent granules could fall.
The term "superabsorbent polymer particle" is intended to include any particulate form of superabsorbent polymer, including irregular granules, spherical particles (beads), staple fibers and other elongated particles.
The term "superabsorbent polymer" refers to a normally water-soluble polymer which has been cross-linked prior to forming the superabsorbent layer of the invention.
It is known from U.
S.
Pat.
Nos.
3,669,103 and 3,670,731 to crosslink carboxylic polyelectrolytes to create hydrogel-forming materials, now commonly referred to as superabsorbents, and to use such materials to enhance the absorbency of disposable absorbent articles.
It is also known from U.
S.
Pat.
Nos.
3,980,663 and 4,076,673 to add crosslinkers to solutions of carboxylated polyelectrolytes and dry and cure the polymer to a superabsorbent