Water absorbent resin particles of crosslinked carboxyl containing polymers and method of preparation

US5629377A · kind A · utility

Assignee

• THE DOW CHEMICAL COMPANY · US

Inventors

• Josef Burgert · Achern, DE
• Stephen B. Christensen · Inver Grove Heights, US
• Herbert Gartner · Baden-Baden, DE
• Fredric L. Buchholz · Midland, US
• Thomas C. Johnson · Roseau, US
• Andrew T. Graham · Midland, US

Key dates

• Filing date: Aug 11, 1995
• Grant date: May 13, 1997
• Expiry date: Aug 11, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F6/006
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

A water-absorbent resin particles that exhibits a centrifuged absorption capacity of 26 g/g or greater, an absorption under load of 24 g/g or greater at 0.6 psi load. Other aspects of the invention are processes for the preparation of such water-absorbent resin particles which comprise the inclusion of chlorine or bromine containing oxidizing agent followed by the heat-treatment to produce particles with superior centrifuged absorption capacity in combination with high absorption under load at high load, and acceptable levels of residuals. These water-absorbent resin particles provide superior performance when incorporated into absorbent structures.