Magnetic recording media having a branched thermoplastic polyurethane binder containing a polysiloxane component in the main chain

US5082737A · kind A · utility

Assignee

• BASF SE

Inventors

• Michael Bobrich · Haßloch, DE
• Hermann Roller · Ludwigshafen, DE
• August Lehner
• Uwe Keppeler · Hochdorf-Assenheim, DE
• Rudolf Suettinger · Heidelberg, DE
• Werner Loch · Erpolzheim, DE
• Werner Lenz · Bad Dürkheim, DE
• Guenther Schulz · Bad Dürkheim, DE

Key dates

• Filing date: Aug 23, 1990
• Grant date: Jan 21, 1992
• Expiry date: Aug 23, 2010

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31609
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Magnetic recording media consist of a nonmagnetic substrate and at least one magnetizable layer which is firmly applied thereon and is based on a polyurethane binder which may be crosslinked with polyisocyanate, not less than 50% by weight of the binder consisting of a low molecular weight branched polyureaurethane having OH-containing urea groups at the chain ends, and the sliding properties of the said binder being improved and its coefficient of friction reduced by incorporation of siloxane groups.