Mixtures, for polyurethane adhesives, which consist of polyols and/or polyamines and polyisocyanates, are liquid at room temperature, have a long shelf life and can be activated by heat

US4543393A · kind A · utility

Assignee

• BASF SE

Inventors

• Rainer Blum · Ludwigshafen, DE
• Hellmut Buensch · Norderstedt, DE
• Wolfgang Druschke
• Helmut Mueller

Key dates

• Filing date: Jul 16, 1984
• Grant date: Sep 24, 1985
• Expiry date: Jul 16, 2004

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S528/902
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Mixtures which are liquid at room temperature, have a long shelf life and can be activated by heat and which comprise PA0 (A) polyols and/or polyamines, component (A) having a viscosity of less than 100 Pa.s at room temperature, the OH number being less than 112 and the mean functionality of the starting materials being from 1.1 to 6, and PA0 (B) polyisocyanates which are dispersed in (A), are stabilized to (A) as a result of a phase-separating deactivation at the surface of the dispersed particles, and are present in an amount such that there are from 0.1 to 2 equivalents of the total isocyanate present in the polyisocyanate per equivalent of hydroxyl or amino groups of component (A), are particularly useful for contact adhesives.