Transparent, compact polyurethane casting compositions that are sterilizable with superheated steam, process for preparing same, and their use, particularly for medical-technical articles

US5182354A · kind A · utility

Assignee

• BASF SE

Inventors

• Peter Horn · Heidelberg, DE
• Walter Heckmann · Weinheim, DE
• Falko Ramsteiner · Ludwigshafen, DE
• Friedrich Gerold · Haar, DE

Key dates

• Filing date: May 7, 1990
• Grant date: Jan 26, 1993
• Expiry date: May 7, 2010

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/4829
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The invention relates to transparent, substantially compact polyurethane casting compositions, sterilizable with superheated steam, which are prepared by the reaction of: PA1 A) modified diphenylmethane diisocyanates (A) that are liquid at 23.degree. C. and are in turn are obtained by the reaction of PA2 1) a diphenylmethane diisocyanate isomer mixture, which in terms of 100 parts by weight comprises 60 to 90 parts by weight of 4,4'-diphenylmethane diisocyanate, 40 to 8 parts by weight of 2,4'-diphenylmethane diisocyanate, and 0 to 5 parts by weight of 2,2'-diphenylmethane diisocyanate with PA2 2) at least one polyoxypropylene polyol initiated with glycerine and/or trimethylol propane, having a molecular weight of 350 to 800 with a ratio of NCO:OH groups of 2.5:1 to 15:1, with PA1 B) at least one compound having at least two reactive hydrogen atoms in the presence or absence of PA1 C) catalysts, as well as to a process for preparing the polyurethane casting compounds and their use for medical-technical articles.