Dispersions of ferromagnetic cobalt particles

Claim 1

A METHOD OF PREPARING COBALT PARTICLES WHICH ARE: (1) DISCRETE, (2) DISPERSED IN AN ORGANIC MEDIUM, (3) INDIVIDUALLY ENCAPSULATED WITH A POLYMERIC ENVELOPE AS EVIDENCED BY ELECTRON PHOTOMICROGRAPH, (4) OF A SIZE IN THE RANGE OF ABOUT 100 TO 1,000 A., (5) EXISTING IN UNITS WHEREIN THE PARTICLES ARE ORGANIZED IN A LINEAR ARRANGEMENT, EACH UNIT HAVING AT LEAST 5 PARTICLE MEMBERS, WHICH COMPRISES: DECOMPOSING IN SOLUTION AT A TEMPERATURE IN THE RANGE OF ABOUT -50* TO 200*C., AN ORGANO-COBALT COMPOUND, WHEREIN COBALT IS COORDINATELY BONDED TO CARBONYL, WHICH IS PRESENT IN AN AMOUNT SUFFICIENT TO FORM METAL PARTICLES OF AT LEAST 100 A., THE SOLVENT OF SAID SOLUTION HAVING AS A MAJOR COMPONENT BASED ON THE TOTAL WEIGHT OF SOLVENT FROM 60 TO 100 PERCENT OF AN INERT ORGANIC SOLVENT OF DIELECTRIC CONSTANT OF FROM 1.7 TO 6 AND A MINOR COMPONENT IN FROM 0 TO 40 PRCENT OF AN ORGANIC MATERIAL HAVING A GREATER DIPOLE MOMENT THAN THE MAJOR COMPONENT OF THE SOLVENT, SAID DIPOLE MOMENT BEING IN THE RANGE OF 1 TO 5.5 D., THE AMOUNT OF SAID MINOR COMPONENT DIINISHING WITH INCREASING DIPOLE MOMENT, AND DISSOLVED IN SAID SOLVENT FROM 0.5 TO 15 PARTS OF POLYMER PER PART OF COBALT OF A FLEXIBLE ORGANIC POLYMER, SAID POLYMER HAVING AT LEAST 1,000 MOLECULAR WEIGHT, AT LEAST 0.1 PER CENT TO ABOUT 45 PERCENT BY WEIGHT OF OTHER THAN SATURATED ALIPHATIC HYDROCARBON, AN AVERAGE DIPOLE MOMENT PER ATOM OTHER THAN HYDROGEN IN THE RANGE OF ABOUT 0.02 TO 1.0 D. AND BEING CAPABLE OF BEING PARTIALLY ADSORBED ON THE COBALT PARTICLE SURFACE AND HAVING AT LEAST A SUBSTANTIAL PORTION BY WEIGHT OF THE POLYMER AWAY FROM THE SURFACE.

Claim 2

A METHOD OF PREPARING COBALT PARTICLES WHICH ARE: (1) DISCRETE, (2) DISPERSED IN AN ORGANIC MEDIUM, (3) INDIVIDUALLY ENCAPSULATED WITH A POLYMERIC ENVELOPE AS EVIDENCED BY ELECTRON PHOTOMICROGRAPH, (4) OF A SIZE IN THE RANGE OF ABOUT 100 TO 1,000 A., (5) EXISTING IN UNITS WHEREIN THE PARTICLES ARE ORGANIZED IN A LINEAR ARRANGEMENT, EACH UNIT HAVING AT LEAST 5 PARTICLE MEMBERS, WHICH COMPRISES: DECOMPOSING IN SOLUTION AT A TEMPERATURE IN THE RANGE OF ABOUT -50* TO 200*C., AN ORGANO-COBALT COMPOUND, WHEREIN COBALT IS COORDINATELY BONDED TO CARBONYL, WHICH IS PRESENT IN AN AMOUNT SUFFICIENT TO FORM METAL PARTICLES OF AT LEAST 100 A., THE SOLVENT OF SAID SOLUTION HAVING AS A MAJOR COMPONENT BASED ON THE TOTAL WEIGHT OF SOLVENT FROM 60 TO 100 PERCENT OF AN INERT ORGANIC SOLVENT OF DIELECTRIC CONSTANT OF FROM 1.7 TO 6 AND A MINOR COMPONENT IN FROM 0 TO 40 PRCENT OF AN ORGANIC MATERIAL HAVING A GREATER DIPOLE MOMENT THAN THE MAJOR COMPONENT OF THE SOLVENT, SAID DIPOLE MOMENT BEING IN THE RANGE OF 1 TO 5.5 D., THE AMOUNT OF SAID MINOR COMPONENT DIINISHING WITH INCREASING DIPOLE MOMENT, AND DISSOLVED IN SAID SOLVENT FROM 0.5 TO 15 PARTS OF POLYMER PER PART OF COBALT OF A FLEXIBLE ORGANIC POLYMER, SAID POLYMER HAVING AT LEAST 1,000 MOLECULAR WEIGHT, AT LEAST 0.1 PER CENT TO ABOUT 45 PERCENT BY WEIGHT OF OTHER THAN SATURATED ALIPHATIC HYDROCARBON, AN AVERAGE DIPOLE MOMENT PER ATOM OTHER THAN HYDROGEN IN THE RANGE OF ABOUT 0.02 TO 1.0 D. AND BEING CAPABLE OF BEING PARTIALLY ADSORBED ON THE COBALT PARTICLE SURFACE AND HAVING AT LEAST A SUBSTANTIAL PORTION BY WEIGHT OF THE POLYMER AWAY FROM THE SURFACE.