PROCESS FOR MANUFACTURING A CONCENTRATE OF A PALLADIUM-TIN COLLOIDAL CATALYST

    公开(公告)号:DE3663151D1

    公开(公告)日:1989-06-08

    申请号:DE3663151

    申请日:1986-02-07

    Applicant: IBM

    Abstract: A concentrate of a palladium-tin colloidal catalyst is obtained by dissolving stannous chloride in HCI, diluting the solution with HCI and then further diluting the solution with deionized water to thereby obtain a diluted stannous chloride solution. This solution is cooled to room temperature or below. A palladium chloride solution is obtained by dissolving palladium chloride in HCI which in tum is also cooled to room temperature or below. The palladium chloride solution is gradually added to the stannous chloride solution and mixed at about room temperature in order to obtain a homogeneous solution. The temperature of the solution is then gradually increased to about 105°C to about 110°C and maintained at that temperature for sufficient time to obtain a homogeneous solution of substantially uniform colloidal particles. The solution of colloidal particles is slowly cooled to about room temperature. The palladium-tin colloidal system is produced reproducibly and is applicable in the manufacturing of highly complex circuitry.

    7.
    发明专利
    未知

    公开(公告)号:DE3480857D1

    公开(公告)日:1990-02-01

    申请号:DE3480857

    申请日:1984-10-09

    Applicant: IBM

    Abstract: Multistep process for electroless plating copper onto a non-conductive surface including the steps of 1) laminating a rough copper sheet onto the non-conductive surface; 2) etching away all the copper; 31 conditioning the surface with multifunctional positively charged molecules derived from copolymers of polyacrylamide and functionally active tetraalkylammonium compounds in an diluted inorganic acid; 4) activating the conditioned surface preferably with stannous palladium chloride particles; 5) treating the activated surface with deionized water and diluted HCI; 6) applying a photoresist layer to the surface and selectively exposing and developing the photoresist to produce a mask corresponding to the negative of the desired circuit pattern; and 7) plating copper using successively two baths differing in their oxygen and CN - concentration, where the foregoing steps are interspersed with washing steps.The inventive method is particularly useful to produce copper circuit on substrates of glass, thermoplastics and thermosetting resins, like epoxy cards and boards. If the step 1) is omitted the method is also applicable in reworking substrates having already undergone copper plating and having been rejected due to failures.

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