Low-modulus silylated polyurethanes

US10370570B2 · kind B2 · utility

Assignee

• Henkel AG & Co. KGaA · DE

Inventors

• Lars Zander · Rommerskirchen, DE
• Helmut Loth · Essen, DE
• Marc Pascal Burmeister · Goldkronach, DE
• Rolf Tenhaef · Goldkronach, DE
• Johann Klein · Goldkronach, DE
• Jan-Erik Damke · Goldkronach, DE

Key dates

• Filing date: Jun 17, 2015
• Grant date: Aug 6, 2019
• Expiry date: Jun 17, 2035

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08J2375/08
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A method for producing a silylated polyurethane that comprises the following steps: (1) reacting at least one polyether polyol having a number average molecular weight of at least 2,000 g/mol with at least one polyisocyanate in the presence of at least one solvent; (2) reacting the reaction product of step (1) with at least one silane of formula (I) A-R—SiXYZ (I), where A means —NH2 or —NHB, wherein B stands for a branched or linear alkyl radical with 1-12 C atoms, possibly having functional groups, a cyclic alkyl radical having 5-8 C atoms, or an aryl radical, R is a divalent hydrocarbon radical having 1-12 C atoms, and X, Y, Z are substituents on the Si atom and are independently of each other C1-C8 alkyl, C1-C8 alkoxy or C1-C8 acyloxy groups, wherein at least one of radicals X, Y, Z is a C1-C8 alkoxy or C1-C8 acyloxy group, in the presence of at least one solvent. Further disclosed is a silylated polyurethane that can be produced by the method, a curable composition based thereon, and the use of such a composition as an adhesive, sealant and/or coating material.