Patent · US Expired

Molded polyurea articles and a process for the production thereof

US4746681A · kind A · utility

2Cited by

6References

5Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Friedhelm Pilger · Cologne, DE
Reinhold Franzen · Leverkusen, DE
Wolfgang Reichmann · Goldkronach, DE

Key dates

Filing date	Apr 10, 1987
Grant date	May 24, 1988
Priority date	—
Expiry date	Apr 10, 2007

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S264/14
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

Molded polyurea foam parts having densities of from 200 to 600 kg/m.sup.3 and a compact skin are made by reacting a polyisocyanate component with a polyamine component in a closed mold at an isocyanate index of from 70 to 130. The polyamine component generally includes (1) an aminopolyether having a molecular weight of from 1800 to 12,000 and 2 to 3 isocyanate reactive groups of which at least 90% are aromatically bound primary and/or secondary amino groups, (2) an aromatic diamine, (3) a foaming agent and optionally (4) known auxiliaries and additives. The polyisocyanate component includes any aromatic di- and/or poly-isocyanate. Parts produced by this process have excellent mechanical properties and a well-defined solid skin.

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