Transparent, autoclavable, non-cytotoxic, essentially compact polyurethane embedding compositions, the preparation thereof and the use thereof, especially for articles used in medicine

US5306798A · kind A · utility

Assignee

• BASF SE

Inventors

• Peter Horn · Heidelberg, DE
• Werner Hinz · Bischofswerda, DE
• Georg Knoblauch · Birkenfeld, DE
• Falko Ramsteiner · Ludwigshafen, DE
• Gottfried Knorr · Schwarzheide, DE

Key dates

• Filing date: Nov 2, 1992
• Grant date: Apr 26, 1994
• Expiry date: Nov 2, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/50
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The invention relates to transparent, autoclavable, non-cytotoxic, essentially compact polyurethane embedding compositions which are prepared by reacting PA0 a) modified diphenylmethane diisocyanates with PA0 b) compounds with at least two reactive hydrogens, which contain or are composed of PA1 b1) at least one polyether-polyol with an average functionality of from 3 to 8, a hydroxyl number of from 200 to 1000 and an alkali metal ion content of from 150 to 1200 ppm or, preferably, a mixture of (b1) and castor oil and/or at least one polyetherpolyol (b2) with a functionality of from 2 to 3, a hydroxyl number of from 90 to 200 and an alkali metal ion content of less than 10 ppm in the presence or absence of PA0 c) catalysts and to a process for preparing the polyurethane embedding compositions and to the use thereof for articles used in medicine.