Use of dispersion adhesives for foam bonding

US12428583B2 · kind B2 · utility

Assignee

• Covestro Deutschland AG · DE

Inventors

• Dirk Achten · Leverkusen, DE
• Wolfgang Arndt · Dormagen, DE
• Robert Liberati · Stotzheim, DE
• Christoph Thiebes · Cologne, DE
• Peter Kueker · Leverkusen, DE
• Harald Kraus · Leverkusen, DE

Key dates

• Filing date: Dec 3, 2020
• Grant date: Sep 30, 2025
• Expiry date: Sep 14, 2042

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/4238
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to the use of an aqueous dispersion containing at least one polyurethane-polyurea polymer formed from (a) at least one difunctional polyester polyol having a number-average molecular weight of 400 to 5000 g/mol, (b) at least one difunctional polyol component having a number-average molecular weight of 762 to 399 g/mol, c) at least one diisocyanate and (d) at least one chain extender optionally having at least one ionic group, for the bonding of at least two substrates by application of the aqueous dispersion to at least one of the substrates to be bonded, subsequent drying of the dispersion present on the at least one substrate in order to obtain at least one adhesive layer, and contacting of the at least one adhesive layer with a further substrate or with an adhesive layer present on a further substrate at a pressure of from 0.1 to 5 bar(a) and a temperature of less than 40° C., wherein the polyurethane-polyurea polymer after the drying has a glass transition temperature Tg of from −65 to 10° C. and a melting point of from 40 to 80° C., to a corresponding process for joining at least two substrates, and to an adhesive composite obtained in this way and compri…