EP 0028796 A3 19810527 - MAGNETIC METAL OR ALLOY PIGMENTS, PROCESS FOR THEIR PRODUCTION, AND THEIR USE
Title (en)
MAGNETIC METAL OR ALLOY PIGMENTS, PROCESS FOR THEIR PRODUCTION, AND THEIR USE
Publication
Application
Priority
- DE 2945687 A 19791113
- DE 3027757 A 19800722
Abstract (en)
[origin: US4325739A] A pigment of a magnetic metal or alloy thereof carrying, in about 0.2 to 30% of the weight of the metal or alloy, a coating of at least one member selected from the group consisting of an ortho-silicic acid ester, a hydrolyzate thereof and a condensation product thereof. Optionally it also carries a corrosion inhibitor. The coated pigment is produced by suspension of the untreated pigment in a liquid medium containing the ortho-silicic acid ester or derivative thereof, and optionally the corrosion inhibitor, followed by separation and drying at 50 DEG to 250 DEG C. The resulting pigment is non-pyrophoric and of high performance properties suitable for use in magnetic recording media.
IPC 1-7
IPC 8 full level
B22F 1/102 (2022.01); C09D 5/23 (2006.01); H01F 1/06 (2006.01)
CPC (source: EP US)
B22F 1/102 (2022.01 - EP US); H01F 1/061 (2013.01 - EP US); Y10T 428/257 (2015.01 - EP US); Y10T 428/2995 (2015.01 - EP US)
Citation (search report)
- [A] FR 1081148 A 19541216 - GEN ANILINE & FILM CORP
- [A] US 4133677 A 19790109 - MATSUI GORO, et al
- [A] DE 893566 C 19531015 - TELEFUNKEN GMBH
Designated contracting state (EPC)
BE DE FR GB IT NL
DOCDB simple family (publication)
EP 0028796 A2 19810520; EP 0028796 A3 19810527; EP 0028796 B1 19830713; AU 534438 B2 19840126; AU 6423880 A 19810521; BR 8007358 A 19810526; CA 1148309 A 19830621; DE 3064151 D1 19830818; PL 135721 B1 19851231; PL 227770 A1 19810724; US 4325739 A 19820420
DOCDB simple family (application)
EP 80106768 A 19801104; AU 6423880 A 19801110; BR 8007358 A 19801112; CA 364365 A 19801110; DE 3064151 T 19801104; PL 22777080 A 19801111; US 20468280 A 19801105