Patent · US Expired

Process for the preparation of cellular polyurethane elastomers based on 4,4'-diisocyanato-1,2-diphenylethane

US4421870A · kind A · utility

7Cited by

2References

9Claims

0Family size

Assignee

BASF SE

Inventors

Herbert Stutz · Karlsruhe, DE
Karl H. Illers · Otterstadt, DE
Herbert Haberkorn · Havelsee, DE
Walter Heckmann · Weinheim, DE

Key dates

Filing date	Sep 20, 1982
Grant date	Dec 20, 1983
Priority date	—
Expiry date	Sep 20, 2002

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G2410/00
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The invention relates to a method for the preparation of cellular polyurethane elastomers with densities of approximately 250 to 800 grams per liter by reacting 4,4'-diisocyanato-1,2-diphenylethane or a diisocyanato-1,2-diphenylethane isomer mixture with a 4,4'-diisocyanato-1,2-diphenylethane content of more than 95 percent by weight with higher molecular weight polyhydroxyl compounds and water, as well as optionally chain extenders in the presence of auxiliaries and/or additives according to the one-shot or preferably the prepolymer method in closed molds. Compared with products based on 4,4'-diisocyanatodiphenylmethane, the polyurethane elastomer molded parts have improved physical and thermal properties.

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