Patent · US Expired

Magnetic recording media

US4666781A · kind A · utility

8Cited by

7References

1Claims

0Family size

Assignee

BASF SE

Inventors

August Lehner
Guenter Heil
Jenoe Kovacs · Heßheim, DE
Werner Balz · Schifferstadt, DE
Werner Lenz · Bad Dürkheim, DE

Key dates

Filing date	Jul 26, 1985
Grant date	May 19, 1987
Priority date	—
Expiry date	Jul 26, 2005

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/31609
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

Magnetic recording media comprising a non-magnetic substrate and a magnetic layer comprising a finely divided magnetic material dispersed in an organic solvent soluble, crosslinkable, essentially linear, thermoplastic polyurethane which possesses acrylate side and terminal groups wherein said polyurethane is prepared by reacting poly- and/or diisocyanates with a mixture of (a) methacrylate - or acrylate - diols having molecular weights of from 146 to 3,000, (b) monoesters of methacrylic or acrylic acid and a diol having a molecular weight of from 116 to 300, and (c) other organic polydiol compounds which have molecular weights of from 400 to 5,000.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.