Process for the production of non-cellular molded articles

US4317791A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Heimo Ludke · Bensberg, DE
• Peter Gunther · Lampertheim, DE
• Helmut Kleimann · Leverkusen, DE

Key dates

• Filing date: Jul 5, 1977
• Grant date: Mar 2, 1982
• Expiry date: Jul 5, 1997

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S521/902
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A process is described for the successive production of at least two non-cellular molded articles differing in their mechanical properties. Both articles are based on organic polyisocyanates which are trimerized in the presence of compounds which are reactive with isocyanate groups where the equivalent ratio of NCO groups to groups reactive with NCO groups is varied within the range of 1:0.8 to 1:0. In a second embodiment, a uniform article is produced having anisotropic mechanical characteristics varying continuously and/or stepwise.