Patent · US Expired

Oligomeric carbodiimides

US5246993A · kind A · utility

8Cited by

5References

30Claims

0Family size

Assignee

BASF SE

Inventors

Deitrich Scherzer · Neustadt, DE
Roland Minges · Havelsee, DE
Friedhelm Lehrich · Bohmte, DE
Werner Langer · Ludwigshafen, DE

Key dates

Filing date	Aug 7, 1992
Grant date	Sep 21, 1993
Priority date	—
Expiry date	Aug 7, 2012

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08L67/00
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

Oligomeric carbodiimides having an average degree of condensation of from 2 to 30, obtainable by oligocondensation of PA0 a) from 40 to 100 mol % of 2,4'-diisocyanatodiphenylmethane or of a 3,3',5,5'-tetra-C.sub.1 -C.sub.4 -alkyl-4,4'-diisocyanatodiphenylmethane and PA0 b) from 0 to 60 mol % of a further bi- or polyfunctional aromatic isocyanate and PA0 c) if desired, complete or partial reaction of the remaining free isocyanate groups of the oligomers with an aliphatic, araliphatic or cycloaliphatic alcohol or amine, are used mainly for stabilizing polyester-containing polyurethanes against hydrolytic degradation.

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