Method for producing one-component sealing and coating compounds with a polyurethane base

US6602973B2 · kind B2 · utility

Assignee

• Sika Chemie GmbH · DE

Inventors

• Martin Schäfer · Arnstadt, DE
• Wilko Moroni · Heidelberg, DE
• Michael Hiller · Brighton, US

Key dates

• Filing date: Dec 1, 1999
• Grant date: Aug 5, 2003
• Expiry date: Dec 1, 2019

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G2190/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A method for producing a one-component sealing and coating compound with a polyurethane base. The method provides a simpler means of production as well as guarantees improved storage stability of the compounds produced, and comprises the following steps: agitating a mixture of poly components and one diisocyanate component to obtain an isocyanate prepolymer with a residual content of monomeric diisocyanate of >2 wt per ct; dispersing pigments and inorganic fillers in the mixture and adding a solvent whilst agitating, the residual content of monomeric diisocyanate reacting with the moisture provided by the fillers so as to obtain a H2O content of <0.01 wt per ct in the reaction mixture; adding a H2O&#8212; reactive latent hardener and optionally, at least one catalyst, and airtight packing of the resulting sealing and coating compound.