Coating compositions for glass substrates

US5852106A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Oswald Wilmes · Recklinghausen, DE
• Beate Baumbach · Burscheid, DE
• Klaus Nachtkamp · Cologne, DE
• Eberhard Konig · Kronberg, DE
• Randall Dearth · Leverkusen, DE
• Manfred Bock · Leverkusen, DE
• Wolfhart Wieczorrek · Cologne, DE

Key dates

• Filing date: May 1, 1997
• Grant date: Dec 22, 1998
• Expiry date: May 1, 2017

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31551
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to aqueous polyurethane coating compositions wherein the binder contains PA1 a) a polyol component, which is soluble or dispersible in water and is the reaction product of a polyisocyanate component containing 50 to 100 wt. % of 4,4'-diisocyanatodicyclohexylmethane, a polyol component containing one or more polyether polyols and having an OH number of 25 to 350 mg KOH/g solids and an isocyanate-reactive component containing at least one group capable of salt formation and PA1 b) a polyisocyanate component, which is soluble or dispersible in water, has blocked isocyanate groups and is the reaction product of a polyisocyanate having an isocyanurate group content of 2 to 30 wt. %, a reversible, monofunctional blocking agent for isocyanate groups, a nonionic hydrophilic component and a stabilizing component which has 1 to 2 hydrazide groups and a molecular weight of 70 to 300, wherein the equivalent ratio of blocked isocyanate groups of component b) to hydroxyl groups of component a) is at least 0.8:1. The present invention also relates to the use of the binders for coating any glass surfaces, especially glass bottles.