Method for the synthesis of polymers, which have polyurethane and/or polyurea groups

US5418311A · kind A · utility

Assignee

• Th. Goldschmidt. AG · DE

Inventors

• Werner Schafer · Essen, DE
• Manfred Scheiba · Essen, DE
• Heribert Seyffert · Essen, DE

Key dates

• Filing date: May 9, 1994
• Grant date: May 23, 1995
• Expiry date: May 9, 2014

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08K3/36
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Polymers, which have polyurethane and/or polyurea groups and contain finely divided fillers, are synthesized by reacting compounds, which contain at least two hydroxyl and/or amino groups, with at least difunctional isocyanates, optionally in the presence of catalysts, and mixing with suitable fillers. The compounds, containing hydroxyl and/or amino groups, and the isocyanates, are separately mixed intimately with finely divided solids so that flowable powders are obtained. The powders obtained are mixed in a stoichiometrically required amount, and the powder mixture is subjected to the action of shear forces at, if necessary, a higher temperature. The mixture of solids obtained has a shelf life of several days or weeks without reaction between the reactive compounds contained therein.