Transparent, steam sterilizable, noncellular polyurethane compositions a process for their preparation and their use especially for medicinal articles

US5045623A · kind A · utility

Assignee

• BASF SE

Inventors

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

Key dates

• Filing date: Aug 8, 1990
• Grant date: Sep 3, 1991
• Expiry date: Aug 8, 2010

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/4816
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The present invention relates to transparent essentially non-cellular polyurethane casting compositions that are sterilizable with superheated steam which are prepared by reacting: PA1 (A) modified diphenylmethane diisocyanates (A) liquid at 23.degree. C. obtained by reacting PA2 (A1) 4,4'-diphenylmethane diisocyanate or PA2 (A2) 2,4'-diphenylmethane diisocyanate or PA2 (A3) a diphenylmethane diisocyanate mixture with PA2 (A4) at least one polyoxypropylene polyol and/or PA2 (A5) at least one polyoxypropylene polyoxyethylene polyol containing 1 to 80 weight percent of ethylene oxide units whereby (A4) and (A5) have a functionality of 4 to 8 and a hydroxyl number of 150 to 500 and are obtained while using sucrose and/or preferably sorbitol as initiator molecules PA2 (A6) a mixture of (A4) and/or (A5) and at least one polyoxypropylene polyol and/or polyoxyethylene polyol initiated with glycerine and/or trimethylolpropane in a NCO:OH group ratio of 2.5:1 to 15:1 with PA1 (B) at least one compound having at least reactive hydrogen atoms which preferably contains no primary, secondary or tertiary amino groups in bonded form in the presence of or absence of PA1 (C) catalysts. The present …