Curing agent for synthetic resins, curable mixtures containing this curing agent and its use

US4940768A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Michael Honel · Mainz, DE
• Manfred Finke
• Gerd Walz · Wiesbaden, DE
• Peter Ziegler · Mainz, DE

Key dates

• Filing date: Mar 21, 1989
• Grant date: Jul 10, 1990
• Expiry date: Mar 21, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D5/4496
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A curing agent (A) for resins (B) which can be cured by means of isocyanates, which has an amine number of 20 to 150 mg of KOH/g and an OH number of not more than 20 mg of KOH/g and which contains per molecule at least two masked isocyanate groups which are reactive under the conditions of curing, obtained by reacting PA1 (a) an amine which contains at least one .beta.-hydroxylalkyl group per molecule and has an OH number of 100 to 1,200 mg of KOH/g and an amine number of 100 to 1,200 mg of KOH/g and which, if appropriate, also contains NHCO groups, if appropriate as a mixture with another OH-functional and/or NH-functional compound, with PA1 (b) a partly masked isocyanate, if appropriate as a mixture with an at least difunctional, OH-reactive and/or NH-reactive compound. These curing agents are readily dispersible in aqueous systems, if appropriate after neutralization, and frequently increase stability in aqueous paint formulations.