Process for the production of cellular polyurethane elastomers

US4280007A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Ernst Meisert · Leverkusen, DE
• Franz-Josef Bohne · Leichlingen, DE
• Klaus Brecht · Burscheid, DE
• Werner Mormann · Zürich, CH
• Wolfgang Krohn
• Gerhard Henes · Leverkusen, DE

Key dates

• Filing date: May 8, 1980
• Grant date: Jul 21, 1981
• Expiry date: May 8, 2000

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G2110/0083
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The instant invention is directed to a process for the production of a cellular polyurethane elastomer having a density of 0.45 to 0.8 g/cm.sup.3, comprising: PA1 (a) preparing a prepolymer having an isocyanate content of 10 to 25% by weight from aromatic polyisocyanates and a portion of one or more polyhydroxyl compounds having a molecular weight of from 400 to 6,000; and PA1 (b) reacting said prepolymer with the remainder of said polyhydroxyl compound and water; wherein the quantity of said water is 0.3 to 1% by weight and the equivalent ratio of isocyanate groups to isocyanate reactive compounds is in the range of 0.95:1 to 1.1:1, characterized in that from 0.1 to 0.8% by weight, based on the whole reaction mixture, of aromatic diprimary diamines having a molecular weight from 108 to 500 are also used in (a) or (b).