EP 0028796 B1 19830713 - COATED MAGNETIC METAL OR ALLOY PIGMENTS, PROCESS FOR THEIR PRODUCTION, AND THEIR USE
Title (en)
COATED 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 1/02 (2006.01); 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 (examination)
- Ullmanns Encyklopädie der technischen Chemie, 4. Aufl., Bd 10 S. 411-416 u. S. 397 sowie Bd. 18, S. 545-551
- Römpps Chemie Lexikon, 1975, S. 2852
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