Process for the preparation of magnetic iron oxides and the pigm

Details Process for the preparation of magnetic iron oxides and the pigm Process for the preparation of magnetic iron oxides and the pigm

1989-12-11

1992-05-26

Dixon, Jr., William R.

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

106456, 106480, C09C 122

Patent

active

051164191

ABSTRACT:
Magnetic iron oxide pigments useful in manufacturing magnetic recording media are prepared by a method which comprises coating a magnetic iron oxide core particle material having the composition FeO, wherein x is from 1.33 to 1.5, in a first step with a preliminary coating of a cobalt-containing bertholloid material or a material having the composition Co.sub.x Fe.sup.II.sub.l-x Fe.sup.III.sub.2 O.sub.4 wherein x is greater than zero but less than or equal to 1 and then in a second step the preliminary coated particle is coated with a cobalt compound.

REFERENCES:
patent: 2917400 (1959-12-01), Edwards
patent: 3826667 (1974-07-01), Cohen et al.
patent: 4066564 (1978-01-01), Sasagawa et al.
patent: 4358431 (1982-11-01), Brunn et al.
patent: 4382822 (1983-05-01), Mayer
patent: 4594267 (1986-06-01), Honma et al.
patent: 4702775 (1987-10-01), Ostertag et al.
patent: 4923519 (1990-05-01), Rodi et al.
patent: 4933014 (1990-06-01), Kathrein et al.
patent: 4990189 (1991-02-01), Wiese et al.

Affiliated with

Also associated with

Rating

Process for the preparation of magnetic iron oxides and the pigm does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for the preparation of magnetic iron oxides and the pigm, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the preparation of magnetic iron oxides and the pigm will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-416918