JPS5665337A - Surface treating method of ferromagnetic powder for magnetic ink - Google Patents

Surface treating method of ferromagnetic powder for magnetic ink

Info

Publication number
JPS5665337A
JPS5665337A JP13758479A JP13758479A JPS5665337A JP S5665337 A JPS5665337 A JP S5665337A JP 13758479 A JP13758479 A JP 13758479A JP 13758479 A JP13758479 A JP 13758479A JP S5665337 A JPS5665337 A JP S5665337A
Authority
JP
Japan
Prior art keywords
ferromagnetic powder
treating
magnetic ink
treating agent
medium
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP13758479A
Other languages
Japanese (ja)
Inventor
Takeo Shimizu
Sadanobu Kawasaki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dai Nippon Printing Co Ltd
Original Assignee
Dai Nippon Printing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dai Nippon Printing Co Ltd filed Critical Dai Nippon Printing Co Ltd
Priority to JP13758479A priority Critical patent/JPS5665337A/en
Publication of JPS5665337A publication Critical patent/JPS5665337A/en
Pending legal-status Critical Current

Links

Landscapes

  • Credit Cards Or The Like (AREA)
  • Printing Methods (AREA)
  • Paints Or Removers (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
  • Magnetic Record Carriers (AREA)

Abstract

PURPOSE: To improve a square ratio, wear resistance and secular stability by using specific dialkylsulfosuccinate as a treating agent and by treating ferromagnetic powder in a medium including a high-polar hydrophilic organic solvent having more than specific values of dielectric constant and solubility to water.
CONSTITUTION: As a treating agent, 0.5W10wt% dialkylsulfosuccinate expressed by the equation [R1 and R2 for CnH2n+1, (n) for 5W20, and M for Na and K] is used for ferromagnetic powder. This and a high-polar hydrophilic organic solvent (methanol, glycol, etc.) of four or more in dielectric constant and 50g or more in solubility to 100g water at 20°C are included in a treating medium by 5% or more. For example, ferromagnetic powder is kneaded in a solution obtained by adding the above-mentioned treating agent and high-polar solvent to a mixture of methyl ethyl ketone and toluene equal in weight as the treating medium and then additives for magnetic ink such as a binder, lubricant are added to manufacture magnetic ink.
COPYRIGHT: (C)1981,JPO&Japio
JP13758479A 1979-10-26 1979-10-26 Surface treating method of ferromagnetic powder for magnetic ink Pending JPS5665337A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13758479A JPS5665337A (en) 1979-10-26 1979-10-26 Surface treating method of ferromagnetic powder for magnetic ink

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13758479A JPS5665337A (en) 1979-10-26 1979-10-26 Surface treating method of ferromagnetic powder for magnetic ink

Publications (1)

Publication Number Publication Date
JPS5665337A true JPS5665337A (en) 1981-06-03

Family

ID=15202123

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13758479A Pending JPS5665337A (en) 1979-10-26 1979-10-26 Surface treating method of ferromagnetic powder for magnetic ink

Country Status (1)

Country Link
JP (1) JPS5665337A (en)

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