Process for producing water-absorbing polymer particles

• Main Authors: HORNER KLAUS DIETER, LINSENBUHLER MARKUS, SIEGEL BERND
• Format: Patent
• Language: English
• Published: 14.10.2015
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS, ORSURGICAL ARTICLES; CHEMISTRY; COMPOSITIONS BASED THEREON; DISINFECTION, STERILISATION, OR DEODORISATION OF AIR; GENERAL PROCESSES OF COMPOUNDING; HUMAN NECESSITIES; HYGIENE; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS, OR SURGICALARTICLES; MEDICAL OR VETERINARY SCIENCE; METALLURGY; METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS INGENERAL; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; WORKING-UP

A process for preparing water-absorbing polymer particles, comprises polymerisation of a foamed monomer solution or suspension, drying, grinding,classification and spray-coating the water-absorbing polymeric particles with an elastic film-forming polymer in a fluidised bed reactor in the range from 0 DEG C to 50 DEG C and heat-treating the coated particles at a temperature above 0 DEG C.