Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1986-07-29
1988-09-27
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
252 6254, 524431, 524576, 5253273, 5253299, 5253305, 5253306, 5253322, 5253329, 525344, 525379, 525381, 525382, 526310, 5263171, 5263183, 526271, 528485, 528490, 528503, C08J 922, C08K 310
Patent
active
047742658
ABSTRACT:
Magnetic polymer particles prepared by treating compact or porous polymer particles with a solution of iron salts and, if desired, salts of other metals which are capable of forming magnetic ferrites, in which the solution swells or penetrates into the particles. Iron hydroxide and possible other metal hydroxides are precipitated, for instance by raising the pH value, and the particles are optionally heated. In the iron salts used the ratio between di- and trivalent iron is suitably such that magnetic iron oxide is formed directly. It is also possible to use oxidizing or reducing groups or additives to obtain such a ratio. When other metal salts are used in addition to iron salts, the operation is carried out in the same manner. For instance, when Mn.sup.++, Co.sup.++ or Ni.sup.++ salts are used in addition to Fe.sup.++ salts, the divalent iron is oxidized to trivalent so that magnetic ferrite is obtained. The polymer particles which are treated with metal salts preferably contain metal-binding groups. Such groups are incorporated for instance by using monomers which contain said groups for the preparation of the polymer particles, or the groups are incorporated in the polymer particles prepared.
The magnetic polymer particles are spherical and have a uniform concentration of magnetic material. They may be used for medical, diagnostic or other purposes.
REFERENCES:
patent: 3520860 (1970-07-01), Bon
patent: 4169804 (1979-10-01), Yapel, Jr.
patent: 4381244 (1983-04-01), Berkowitz et al.
patent: 4421660 (1983-12-01), Solc nee Hajna
patent: 4447475 (1984-05-01), Lubbock et al.
patent: 4452773 (1984-06-01), Molday
patent: 4554088 (1985-11-01), Whitehead et al.
patent: 4609608 (1986-09-01), Solc
Berge Arvid
Ellingsen Turid
Helgee Oskar B.
Ugelstad John
Schofer Joseph L.
Sintef
Teskin F. M.
LandOfFree
Process for preparing magnetic polymer particles 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 preparing magnetic polymer particles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for preparing magnetic polymer particles will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2398231