Patent · US Active

Water-absorbent porous polymer particles having specific sphericity and high bulk density

US8481159B2 · kind B2 · utility

2Cited by

7References

9Claims

0Family size

Assignee

BASF SE

Inventors

Rainer Dobrawa · Stuttgart, DE
Thomas Daniel · Waldsee, DE
Uwe Stueven · Bad Soden, DE
Marco Krüger · Mannheim, DE
Francisco Javier Villanueva · Mexico City, MX
Norbert Herfert · Charlotte, US
Karin Flore · Monsheim, DE
Stefan Blei · Mannheim, DE
Michael A. Mitchell · Fort Mill, US

Key dates

Filing date	Aug 25, 2010
Grant date	Jul 9, 2013
Priority date	—
Expiry date	Aug 25, 2030

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/31935
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

The present invention relates to a process for producing water-absorbent polymer particles by polymerizing droplets of a monomer solution in a surrounding heated gas phase and flowing the gas cocurrent through the polymerization chamber, wherein the temperature of the gas leaving the polymerization chamber is 130° C. or less, the gas velocity inside the polymerization chamber is at least 0.5 m/s, and the droplets are generated by using a droplet plate having a multitude of bores.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.