Process for the preparation of water-dispersible or water-soluble blocked polyisocyanates, the blocked polyisocyanates obtainable by this process and lacquer binders containing these blocked polyisocyanates as isocyanate component

US4284544A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Christian Wegner · Cologne, DE
• Kurt Findeisen · Odenthal, DE
• Franz Weider · Leverkusen, DE

Key dates

• Filing date: Dec 10, 1979
• Grant date: Aug 18, 1981
• Expiry date: Dec 10, 1999

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G18/8054
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Blocked polyisocyanates with improved water-dispersible or water-soluble properties are prepared by reacting polyisocyanates, in which 50 to 99.8% of the isocyanate groups are blocked, optionally in a solvent-free environment with an organic polyaminosulphonate or an organic polyaminosulphonic acid in sufficient quantities to provide an end product containing from 0.1 to 10%, by weight, of sulphonate groups (SO.sub.3.sup.-). The blocked polyisocyanates have particular utility when used in combination with hydrophobic polyhydroxyl compounds as binders in aqueous coating compounds.