Magnetic powders with improved dispersibility

Claim 2

A magnetic powder for use in magnetic recording mediums comprising individual magnetic particles of the powder, said particles being individually coated with a thin film of nitrogen- or sulfur-containing organic polymer synthesized thereon by plasma polymerization.

Claim 3

The powder in claim 1 wherein the film is not more than 100 Å in thickness.

Claim 4

A magnetic recording medium comprising a substrate and a magnetic layer on said substrate, said magnetic layer comprising a binder and a plurality of individual magnetic particles, said individual particles being coated with a thin film of nitrogen- or sulfur-containing organic polymers synthesized thereon by plasma polymerization.

Claim 5

A magnetic recording medium comprising a substrate and a magnetic layer on said substrate, said magnetic layer comprising a binder and a plurality of individual magnetic particles, said individual particles being coated with a thin film of nitrogen- or sulfur-containing organic polymers synthesized thereon by plasma polymerization.

Claim 8

A magnetic powder for use in magnetic recording mediums comprising individual magnetic particles of the powder, said particles being individually coated with a thin film of nitrogen- or sulfur-containing organic polymers synthesized thereon by plasma polymerization, said nitrogen- or sulfur-containing organic polymers being substantially fluorine-free.

Claim 9

A magnetic powder for use in magnetic recording mediums comprising individual magnetic particles of the powder, said particles being individually coated with a thin film of nitrogen- or sulfur-containing organic polymers synthesized thereon by plasma polymerization, said nitrogen- or sulfur-containing organic polymers being substantially fluorine-free.

Claim 10

The powder in claim 5 wherein the film is not more than 100 Å in thickness.

Claim 11

A magnetic powder for use in magnetic recording mediums comprising the individual magnetic particles of the powder, said particles being individually coated with a thin film of nitrogen- or sulfur-containing organic polymer synthesized thereon by plasma polymerization, said nitrogen-containing organic polymer selected from the group consisting of imidazole, pyrazole, triazole, tetrazole, benzoxazole, benzothiazole, benzoimidazole, benzotriazole, oxathiazole, benzoxythiazole, indole, indolenine, oxyindole, carbazole, nitrocarbazole, aminocarbazole, pyridine, picoline, ethylpyridine, propylpyridine, isopropylpyridine, butylpyridine, dimethylpyridine, trimethylpyridine, 2-vinylpyridine, 3-vinylpyridine, 4-vinylpyridine, 2-methyl-5-vinylpyridine, 5-ethyl-2-vinylpyridine, 3-allylpyridine, 2-benzylpyridine, 4-benzylpyridine, phenylpyridine, 2,2'-dipyridyl, 2,3'-dipyridyl, 2,4'-dipyridyl, chloropyridine, bromopyridine, nitropyridine, aminopyridine, aminomethylpyridine, cyanopyridine, quinoline, propylquinoline butylquinoline, phenylquinoline, lepidine, methylquinoline, nitroquinoline, isoquinoline, methyl-isoquinoline, nitroisoquinoline, acridine oxazine, thiazine, benzothiazine, pyridazine, aminopyridazine, cinnoline, aminocinnoline, pyrimidine, aminopyrimidine, pyrazine, 2-methylpyrazine, 2,5-dimethylpyrazine, piperazine, quinoxaline, triazine, tetrazine, nitromethane, nitroethane, nitropropene, nitrobutane, nitrohexane, nitroethylene, nitropropene, nitrobutene, nitropentadiene, nitropentene, nitrohexene, nitroheptene, nitrooctene, dinitroethane, dinitropropane, trinitromethane, tetranitromethane, methylamine, trimethylamine, isobutylamine, isoamylamine, methylenediamine, ethylenediamine, 1,2,3-triaminopropane, ethyleneimine, trimethyleneimine, cyclic polymethyleneimine, dipropargylamine, tripropargylamine, N,N-dimethylpropargylamine, N,N-diethylpropargylamine, nitrobenzene, dinitrobenzene, nitrosobenzene, nitrotoluene, toluidine, N-methylaniline, N-ethylaniline, N,N-dimethylaniline, N,N-diethylaniline, diphenylamine, formanilide, N-methylpyrrolidone, and vinylpyrrolidone, and said sulfur-containing organic polymer selected from the group consisting of thiazole, isothiazole, thiadiazole, thiatriazole, oxathiazole, benzoxathiazole, thiazine, benzothiazine, trimethylene sulfide, thiophene, methylthiophene, dimethylthiophene, trimethylthiophene, ethylthiophene, isopropylthiophene, 2-vinylthiophene, 3-vinylthiophene, 2-thienylacetylene, 3-thienylacetylene, nitrothiophene, aminothiophene, thianaphthene, dithiolan, oxathiolan, tetrahydrothiopyran, thiachromangithiane, methyl mercaptan, ethyl mercaptan, allyl mercaptan, ethyl sulfide, vinyl sulfide, allyl sulfide, thidiglycol, trithioacetone, methylene dimethyl mercaptal, acetone diethyl mercaptol, ethanethiolic acid, ethanethionic acid, ethanethionothionic acid, thioformamide, methyl sulfoxide, ethyl sulfoxide, divinyl sulfone, diallyl sulfone, allylvinyl sulfone, methanesulfonic acid, ethanesulfonic acid, propanesulfonic acid, butanesulfonic acid, pentanesulfonic acid, hexanesulfonic acid, ethylenesulfonic acid, 1-propane-1-sulfonic acid, thiophenol, thiocresol, thionylaniline, benzenesulfonic acid, benzenesulfinic acid, methyl toluenesulfonate ester, and phenolsulfonic acid.

Claim 12

A magnetic powder for use in magnetic recording mediums comprising the individual magnetic particles of the powder, said particles being individually coated with a thin film of nitrogen- or sulfur-containing organic polymer synthesized thereon by plasma polymerization, said nitrogen-containing organic polymer selected from the group consisting of imidazole, pyrazole, triazole, tetrazole, benzoxazole, benzothiazole, benzoimidazole, benzotriazole, oxathiazole, benzoxythiazole, indole, indolenine, oxyindole, carbazole, nitrocarbazole, aminocarbazole, pyridine, picoline, ethylpyridine, propylpyridine, isopropylpyridine, butylpyridine, dimethylpyridine, trimethylpyridine, 2-vinylpyridine, 3-vinylpyridine, 4-vinylpyridine, 2-methyl-5-vinylpyridine, 5-ethyl-2-vinylpyridine, 3-allylpyridine, 2-benzylpyridine, 4-benzylpyridine, phenylpyridine, 2,2'-dipyridyl, 2,3'-dipyridyl, 2,4'-dipyridyl, chloropyridine, bromopyridine, nitropyridine, aminopyridine, aminomethylpyridine, cyanopyridine, quinoline, propylquinoline butylquinoline, phenylquinoline, lepidine, methylquinoline, nitroquinoline, isoquinoline, methyl-isoquinoline, nitroisoquinoline, acridine oxazine, thiazine, benzothiazine, pyridazine, aminopyridazine, cinnoline, aminocinnoline, pyrimidine, aminopyrimidine, pyrazine, 2-methylpyrazine, 2,5-dimethylpyrazine, piperazine, quinoxaline, triazine, tetrazine, nitromethane, nitroethane, nitropropene, nitrobutane, nitrohexane, nitroethylene, nitropropene, nitrobutene, nitropentadiene, nitropentene, nitrohexene, nitroheptene, nitrooctene, dinitroethane, dinitropropane, trinitromethane, tetranitromethane, methylamine, trimethylamine, isobutylamine, isoamylamine, methylenediamine, ethylenediamine, 1,2,3-triaminopropane, ethyleneimine, trimethyleneimine, cyclic polymethyleneimine, dipropargylamine, tripropargylamine, N,N-dimethylpropargylamine, N,N-diethylpropargylamine, nitrobenzene, dinitrobenzene, nitrosobenzene, nitrotoluene, toluidine, N-methylaniline, N-ethylaniline, N,N-dimethylaniline, N,N-diethylaniline, diphenylamine, formanilide, N-methylpyrrolidone, and vinylpyrrolidone, and said sulfur-containing organic polymer selected from the group consisting of thiazole, isothiazole, thiadiazole, thiatriazole, oxathiazole, benzoxathiazole, thiazine, benzothiazine, trimethylene sulfide, thiophene, methylthiophene, dimethylthiophene, trimethylthiophene, ethylthiophene, isopropylthiophene, 2-vinylthiophene, 3-vinylthiophene, 2-thienylacetylene, 3-thienylacetylene, nitrothiophene, aminothiophene, thianaphthene, dithiolan, oxathiolan, tetrahydrothiopyran, thiachromangithiane, methyl mercaptan, ethyl mercaptan, allyl mercaptan, ethyl sulfide, vinyl sulfide, allyl sulfide, thidiglycol, trithioacetone, methylene dimethyl mercaptal, acetone diethyl mercaptol, ethanethiolic acid, ethanethionic acid, ethanethionothionic acid, thioformamide, methyl sulfoxide, ethyl sulfoxide, divinyl sulfone, diallyl sulfone, allylvinyl sulfone, methanesulfonic acid, ethanesulfonic acid, propanesulfonic acid, butanesulfonic acid, pentanesulfonic acid, hexanesulfonic acid, ethylenesulfonic acid, 1-propane-1-sulfonic acid, thiophenol, thiocresol, thionylaniline, benzenesulfonic acid, benzenesulfinic acid, methyl toluenesulfonate ester, and phenolsulfonic acid.