Polymeric materials suitable as dispersing resins

US5556918A · kind A · utility

Assignee

• BASF Magnetics GmbH · DE

Inventors

• Gregor Brodt · Heppenheim, DE
• August Lehner
• Alfred Lindner · Frankenthal (Pfalz), DE
• Hermann Graf · Berlin, DE
• Michael Bobrich · Haßloch, DE
• Ria Kress · Ludwigshafen, DE
• Norbert Schneider · Schorndorf, DE
• Albert Kohl · Laumersheim, DE
• Werner Loch · Erpolzheim, DE

Key dates

• Filing date: Jan 10, 1995
• Grant date: Sep 17, 1996
• Expiry date: Jan 10, 2015

Classification

• Technology area (CPC G): Physics
• CPC primary: G11B5/7022
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Polymeric materials (I) are obtainable by reacting PA0 1. a polymer II comprising PA1 a) from 80 to almost 100 mol % of a C.sub.1 -C.sub.25 -alkyl ester of an .alpha.,.beta.-unsaturated carboxylic acid, PA1 b) from 0 to 20 mol % of a further monomer, PA1 c) tetrahydrofuran hydroperoxide as polymerization initiator and, if required, PA1 d) a further polymerization initiator and/or regulator by means of which the majority of the polymer chains of the polymer II are terminated at one of their ends by a hydroxyl group, PA0 2. with a polyfunctional isocyanate III to give a reaction product IV, the amount of isocyanate groups being from 1.2 to 3.0 mol per mol of hydroxyl groups of II, and PA0 3. reacting IV with ammonia or with a compound V which has an amino function reactive toward isocyanates. The polymeric materials can be used as dispersing resins for pigment-containing coatings, in particular for the production of magnetic recording materials.