WATER BASED SELECTABLE CHARGE MAGNETIC INKS

    公开(公告)号:CA1107057A

    公开(公告)日:1981-08-18

    申请号:CA292605

    申请日:1977-12-07

    Applicant: IBM

    Abstract: WATER BASED SELECTABLE CHARGE MAGNETIC INKS Water based magnetic colloidal fluids, useable as inks, when prepared by coating chemically precipitated magnetite (Fe304) with an adsorption site providing coating agent including certain organic anions, such as sulfates, sulfonates or amino carboxilates, and then dispersing the coated product with non-ionic, anionic or cationic surfactants may exhibit selectably cationic, anionic or non-ionic charge responsiveness.

    6.
    发明专利
    未知

    公开(公告)号:DE2061225A1

    公开(公告)日:1971-09-09

    申请号:DE2061225

    申请日:1970-12-12

    Applicant: IBM

    Abstract: The effect of superimposing a sinusoidal alternating current on a direct current during electrodeposition of Ni-Fe alloys is disclosed in terms of the following factors: (a) maintaining the pH at the electrode equal to that of the bulk electrolyte; (b) ionic diffusion processes; and (c) chemical processes in solution prior to electrochemical reduction. The effect of frequency, amplitude and the rate of a-c current to d-c current on the composition of electrodeposited alloy are given for acid solutions of different pH and for alkaline solutions of metallic complexes with a variable concentration of complexing agent. It is shown that by proper choice of conditions, electrodeposited Fe-Ni alloys can be prepared with a desired uniform composition throughout their thickness.

    10.
    发明专利
    未知

    公开(公告)号:DE1621095A1

    公开(公告)日:1972-02-03

    申请号:DEJ0035378

    申请日:1967-12-29

    Applicant: IBM

    Abstract: 1,176,124. Coating with metals. INTERNATIONAL BUSINESS MACHINES CORP. Jan.8, 1968 [Jan.13, 1967], No.1038/68. Heading C7F. In the electroless deposition of a metal coating on a polymer, the surface is coated with a constituent monomer of the polymer, the monomer polymerized, and coated with a reducible metal salt, the monomer acting as a reducing agent for the metal salt. In an example a urea formaldehyde substrate is soaked in nitric acid, rinsed, dipped in formaldehyde, dried to polymerize the coating, and then the coatings is depolymerized in the presence of a metal salt which may be palladium, gold or nickel chloride or nickel, cobalt. or copper sulphate. The metal salt is reduced during this process. The substrate is then coated with Ni, Co, Cu, Pd or Ni-Fe, Ni-Co, or Ni-W-P alloys. Examples of both alkali and acid electroless nickel plating baths are desinked. The coating may be subsequently electro-plated.

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