Basf Aktiengesellschaft

Hoechst Celanese Corporation

Virginia Chemicals Inc.

James C Robinson

Mark A Schroeder

S Allen Grimsley

Michael A Mitchell

Norbert Herfert

Guy T Woodrum

Michael M Azad

Patricia D Brown

William G-j Chiang

Superabsorbent polymer (SAP) particels containing a clay are disclosed. The clay is added to an SAP hydrogel prior to SAP neutralization to provide particles having improved fluid acquisition rates and an improved permeability of a fluid through the swollen SAP-clay particles. Diaper cores and absorbent articles containing the SAP-clay particles also are disclosed.

Superabsorbent polymers and method of manufacturing the same

Compositions and a method are disclosed for minimizing brightness reversion of chromophore-containing wood pulps, especially low-cellulose wood pulps, such as groundwood and thermomechanical pulps, which have been reductively bleached or bleached with hydrogen peroxide. Ascorbic acid and palmitoyl ascorbate are particularly effective for preventing such reversion at low levels.

Enhanced dithionite bleaching

A method is described for increasing the brightness of reductively bleached high yield pulps, comprising bleaching the pulps with a reductive bleaching solution under anaerobic conditions and maintaining the bleached pulps under anaerobic conditions during all handling steps subsequent to bleaching, including paper formation, wet pressing, and drying of the paper formed therefrom. The bleached paper has higher brightness than the same paper produced under aerobic conditions, and the bleaching and handling-derived portion of this higher brightness is retained after storage of the finished paper.

Method of bleaching high yield pulp by using dithionite ion and

Growing community of inventors

Chesapeake, VA, United States of America

James C Robinson