Method of and apparatus for producing a foamed mass of a polyurea elastomer

US5157059A · kind A · utility

Assignee

• KraussMaffei GmbH · DE

Inventors

• Adolf Bauer · Olching, DE
• Franz Urban · Rosenheim, DE
• Josef Renkl · Markt Indersdorf, DE

Key dates

• Filing date: Mar 13, 1992
• Grant date: Oct 20, 1992
• Expiry date: Mar 13, 2012

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S521/917
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

Through three separate passages opening in a common plane at right angles to one another into a mixing chamber, three components of a reactant polyurethane or polyurea elastomer composition to form in a mold cavity are introduced. One of the components is an aliphatic polyether amine having primary amino function and substantially free from free hydroxyl groups, catalysts with tertiary amino groups, carbon dioxide as a carbamate reactive with the polyether amine and optionally other inert gases and conventional polyurea additives. The second component is a polyisocyanate or prepolymer thereof and the third component C is water. The reacting mixture is formed through a throttle gap into the mold to form low-density foamed products under low fuming conditions and has no unreacted diisocyanates.