Patent · US Expired

Urea-modified isocyanurates and method of making rigid foams thereof

US5223551A · kind A · utility

10Cited by

4References

8Claims

0Family size

Assignee

UOP LLC · US

Inventors

Mark J. Gattuso · Palatine, US
David W. House · Arlington Heights, US
Ray V. Scott, Jr. · Schaumburg, US

Key dates

Filing date	Dec 26, 1991
Grant date	Jun 29, 1993
Priority date	—
Expiry date	Dec 26, 2011

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S521/902
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

Rigid urea-modified polyisocyanurate foams with improved dimensional stability and flame retardancy have densities of 1-12 p.c.f., a limiting oxygen index greater than 22 and dimensional changes at 100% R.H. and 70.degree. C. of less than 2% in any linear dimension and a method of making same. The method comprises reacting an organic polyisocyanate, a blowing agent and an N,N'-dialkyl aromatic diamine in the presence of a trimerization catalyst and, if water is used as the blowing agent, a blowing catalyst, wherein the N,N'-dialkyl aromatic diamine and an amine produced by water, if used, constitute the sole sources of active hydrogen.

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