Aqueous dispersion of silane-functional polyurethane resins, coating compositions and use thereof

US5908895A · kind A · utility

Assignee

• Herberts Gesellschaft mit beschrankter Haftung · DE

Inventors

• Bettina Vogt-Birnbrich · Solingen, DE
• Armin Gobel · Syke, DE
• Wilfried Collong · Wermelskirchen, DE
• Birgit Kleuser · Wetter, DE

Key dates

• Filing date: Jun 20, 1997
• Grant date: Jun 1, 1999
• Expiry date: Jun 20, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D175/06
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Aqueous dispersion of silane-functional polyurethane resins having a number average molecular weight of 10000 to 500000 and a silicon content of 1 to 30 mmol per 100 g of resin solids obtainable by reacting PA1 (A) adducts containing NCO groups, which adducts are obtainable by reacting PA2 a) one or more compounds having at least one ionic or ionisable and/or hydrophilic nonionic group, and more than one isocyanate-reactive group with PA2 b) one or more organic diisocyanates, PA1 (B) with polyesters having an OH value of 150 to 300 mg of KOH/g and more than three OH groups per molecule, which are obtainable by reacting PA2 c) polyalcohols with PA2 d) polycarboxylic acids and PA2 e) monofatty acids PA1 (C) optionally with linear polyesters having an OH value of 40 to less than 150 mg of KOH/g, which contain no monofatty acids, and PA1 (D) with organic polyisocyanates, wherein at least a proportion of the polyisocyanates has at least one functional group R.sup.1 OSi.tbd. in which PA2 R.sup.1 means C.sub.1 to C.sub.8 alkyl or --C(O)R.sup.2 and R.sup.2 means C.sub.1 to C.sub.10 alkyl, PA2 and converting the reaction product into an aqueous dispersion.