Device and process for producing plastic components, especially polyurethane moldings

US6136238A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Werner Rasshofer · Kürten, DE
• Henry Muller · Graz, AT
• Achim Symannek · Leichlingen, DE

Key dates

• Filing date: Sep 4, 1998
• Grant date: Oct 24, 2000
• Expiry date: Sep 4, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G2125/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for preparing solid, microcellular or expanded plastic molded items, characterized in that said molded items are produced in molds in which the internal surfaces consist of steel with the percentage composition: PA1 a) Fe: having a wt % greater than 0 wt % and less than 100 wt %; PA1 b) at least one element selected from the group consisting of W, Mo, or V, wherein if W is selected, W is present from a range greater than 0 wt % to 40 wt %; wherein if Mo is selected, Mo is present from a range greater than 0 wt % to 12 wt %; and if V is selected, V is present from a range greater than 0 wt % to 5 wt %; PA1 c) at least one element selected from the group consisting of Cr, Al, wherein if Cr is selected, Cr is present in a concentration of greater than 0 wt % to 15 wt %; and if Al is selected, Al is present in a concentration of greater than 0 wt % to 15 wt %; PA1 d) optionally, carbon at a concentration ranging from 0.1 to 1.5 wt %; PA1 e) optionally, cobalt at a concentration ranging from 0.1 to 10 wt %; and PA1 f) optionally, nitrogen in a nitriding layer at a concentration ranging from greater than 0 wt % to 10 wt %.