Patent · US Expired

Process for the solvent-free, continuous preparation of polyureas

US7129313B2 · kind B2 · utility

0Cited by

9References

1Claims

0Family size

Assignee

Degussa AG · DE

Inventors

Joern Weiss · Haltern, DE
Thomas Weihrauch · Schneverdingen, DE
Werner Grenda · Herne, DE
Silvia Herda · Herne, DE
Klaus Behrendt · Herne, DE

Key dates

Filing date	Nov 29, 2002
Grant date	Oct 31, 2006
Priority date	—
Expiry date	Mar 29, 2023

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G18/792
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The invention relates to a process for the solvent-free, continuous preparation of polyureas by reacting at least one isocyanate and/or isocyanurate having at least two NCO groups with at least one diamine and/or polyamine in an extruder, intensive kneader, intensive mixer or static mixer by thorough mixing and rapid reaction by briefly heating and subsequent cooling to isolate the end product.

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