Patent · US Expired

Process for the production of molded articles by deep-drawing prefabricated polyurethane(urea) parts or by pressing fragmented polyurethane(urea) material

US5069857A · kind A · utility

0Cited by

4References

3Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Joachim Wagner · Ludwigshafen, DE
Thomas Elsner · Düsseldorf, DE
Werner Rasshofer · Kürten, DE
Jurgen Faehndrich · Leverkusen, DE
Eberhard Jurgens · Cologne, DE

Key dates

Filing date	Oct 29, 1990
Grant date	Dec 3, 1991
Priority date	—
Expiry date	Oct 29, 2010

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB29K2075/00
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

The invention is directed to a process for the production of molded articles by deep-drawing a prefabricated polyurethane(urea) part produced from a polyisocyanate polyaddition product having a specific gravity of at least 0.8 g/cm.sup.3. The part is placed inside a deep-drawing mold and pressed at a temperature of up to 230.degree. C. and a pressure of up to 1,000 bar. After the deep-drawing process, the part is subjected to a dwell time of at least 10 seconds at a temperature of up to 230.degree. C. and a pressure of up to 1,000 and is immediately thereafter removed from the mold.

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