Electrical insulating enamel binders having a urea and/or hydantoin structure

US6512073B2 · kind B2 · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Rolf Gertzmann · Leverkusen, DE
• Lutz Schmalstieg · Neunburg vorm Wald, DE
• Jan Mazanek · Cologne, DE
• Bernd Hausstätter · Leverkusen, DE

Key dates

• Filing date: Oct 15, 2001
• Grant date: Jan 28, 2003
• Expiry date: Oct 15, 2021

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09D175/02
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to novel binders for electrical insulating enamels, comprising at least one hydroxy- and/or amino-functional polyurethane containing urea and/or hydantoin groups, prepared by reacting:a) from 15 to 40 wt. % of an organic polyisocyanate or of a mixture of organic polyisocyanates,b) from 5 to 20 wt. % of at least one aspartic acid ester, andc) from 5 to 50 wt. % of a polyhydroxy compound having a molar weight from 62 to 3000 g/mol, ind) from 25 to 50 wt. % of a solvent or of a solvent mixture and at least one blocked isocyanate component containing ester, imide, amide, and/or urethane groups, at least one organic solvent, and optionally further auxiliary substances and additives whereby the resulting enamels being distinguished by high temperature stability and good solderability.