Patent · US Expired

Postcrosslinking of water absorbing polymers with cyclic carbamates and/or cyclic ureas

US7655733B2 · kind B2 · utility

0Cited by

22References

6Claims

0Family size

Assignee

BASF SE

Inventors

Kai Michael Exner · Eppelheim, DE
Thomas Daniel · Waldsee, DE
Mark Elliott · Ludwigshafen, DE
Ulrich Riegel · Landstuhl, DE

Key dates

Filing date	Jul 28, 2005
Grant date	Feb 2, 2010
Priority date	—
Expiry date	Dec 15, 2025

Classification

Technology area (CPC A)Human Necessities
CPC primaryA61L15/60
WIPO fieldMedical technology
WIPO sectorInstruments

Abstract

Disclosed is a process for postcrosslinking a water absorbing polymer by the polymer being treated with at least one postcrosslinker and postcrosslinked and dried during or after the treatment by raising the temperature, the at least one postcrosslinker being a cyclic carbamate or a cyclic urea, wherein the cyclic carbamate or the cyclic urea was obtained by reacting respectively an aminoalcohol or a diamine with a cyclic carbonate.

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