3.
    发明专利
    未知

    公开(公告)号:DE1817355A1

    公开(公告)日:1969-08-07

    申请号:DE1817355

    申请日:1968-12-28

    Abstract: 1,218,850. Electroless deposition of copper. PHOTO-CIRCUITS CORP. Dec.19, 1968 [Dec.28, 1967], No.60309/68. Heading C7F. Cu is electrolessly deposited on to e.g. sensitized insulating substrates from a solution comprising a water soluble Cu salt, a complexing agent for cupric ions, a pH adjuster, a reducing agent and 0À001-30 mgms/litre of Os which is preferably added as osmium tetroxide or potassuim osmiate. The Cu salt may be the sulphate, halide, nitrate or acetate, the reducing agents may be formaldehyde, paraformaldehyde, trioxane, 1-hydroxymethyl 5, 5- dimethyl hydantoin, glyoxal, hoxohydrides, boranes and hypophosphites. The complexing agent is the tetrasodium salt of ethylene-diaminetetraacetic acid and less than 5 gms/litre surfactants such as organic phosphate esters and oxyethylated sodium salts may be added. 0À02-0À1 mole/litre of P as organic and inorganic phosphorus compounds, up to 300 p.p. m of S may also be added. Test pieces of steel are treated in the solution.

    5.
    发明专利
    未知

    公开(公告)号:DE1621311A1

    公开(公告)日:1970-07-23

    申请号:DE1621311

    申请日:1967-05-03

    Abstract: 1,145,578. Printed circuits. PHOTOCIRCUITS CORP. 4 May, 1967 [6 May, 1966], No. 20684/67. Heading H1R. [Also in Division C7] Portions of an insulating substrate, such as a plastics material, of which many suitable examples are listed, are sensitized in the form of a desired printed circuit form, e.g. by treatment with an acidic aqueous solution of stannous chloride followed by a dilute acid aqueous solution of Pd chloride, or by treatment with a single acidic solution containing stannous chloride and a precious metal chloride such as Pd chloride. Cu or other metal is then deposited on one or more surfaces of the substrate, and on the walls of holes through it, by electroless deposition from a solution on to the sensitized parts of the substrate, said solution including a compound containing a cyanide radical complexed with a metal from Group VIII of the Periodic Table.

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