Compositions: coating or plastic – Coating or plastic compositions – Carbohydrate or derivative containing
Patent
1980-11-05
1982-04-20
Dees, Carl F.
Compositions: coating or plastic
Coating or plastic compositions
Carbohydrate or derivative containing
106304, 106308Q, 106309, 252 6255, C04B 3128, B22F 102
Patent
active
043257399
ABSTRACT:
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.degree. to 250.degree. C. The resulting pigment is non-pyrophoric and of high performance properties suitable for use in magnetic recording media.
REFERENCES:
patent: 2744040 (1956-05-01), Altmann
patent: 3520676 (1970-07-01), Stahr
patent: 4014710 (1977-03-01), Woditsch et al.
patent: 4043846 (1977-08-01), Amemiya et al.
patent: 4073977 (1978-02-01), Koester et al.
patent: 4075384 (1978-02-01), Suzuki et al.
patent: 4076890 (1978-02-01), Yamada et al.
patent: 4167582 (1979-09-01), Takahashi et al.
Biermann Hans-Peter
Botta Artur
Heine Heinrich
Leitner Lutz
Naumann Rolf
Bayer Aktiengesellschaft
Dees Carl F.
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