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    SOLDER FLUXES BEARING OXIDE REMOVERS GENERATED BY LIGHT
    1.
    发明专利
    SOLDER FLUXES BEARING OXIDE REMOVERS GENERATED BY LIGHT 未知

    公开(公告)号：CA2088148A1

    公开(公告)日：1992-02-14

    申请号：CA2088148

    申请日：1991-08-13

    Applicant: MOTOROLA INC

    Inventor： LANDRETH BOBBY D ,  PENNISI ROBERT W ,  DAVIS JAMES L ,  NOUNOU FADIA

    IPC: B23K35/363 ,  B23K1/00 ,  B23K35/36 ,  H05K3/34

    Abstract: Fluxing compositions containing compounds that generate acids upon photoinitiation from a light source such as Hg/Xe ultraviolet (UV) light sources are described. The acids clean oxides from the printed circuit boards (PCBs) under assembly and then volatilize with little or no need for a cleaning step, or cleaning only with water. The compounds that release an oxide removing agent, sometimes called a "photoacid" include metal and organic onium salts and furyl compounds bearing a carbonyl group. Such fluxing compositions can be used mixed with typical solder formulations, such as lead/tin solders, or applied topically thereto; both techniques permit the assembly of PCBs more easily and with high quality bonds.

    USE OF ORGANIC ACIDS IN LOW RESIDUE SOLDER PASTES
    2.
    发明专利
    USE OF ORGANIC ACIDS IN LOW RESIDUE SOLDER PASTES 未知

    公开(公告)号：CA2063834A1

    公开(公告)日：1991-11-18

    申请号：CA2063834

    申请日：1991-04-15

    Applicant: MOTOROLA INC

    Inventor： DAVIS JAMES L ,  PENNISI ROBERT W ,  NOUNOU FADIA ,  LANDRETH BOBBY D

    IPC: H05K3/34 ,  B23K35/22 ,  B23K35/36 ,  B23K35/363 ,  B23K35/34

    Abstract: 2063834 9117858 PCTABS00008 Fluxing compositions are described containing as fluxing agents compounds of formula (I), where R is an electron withdrawing group. Im one embodiment, R is selected from the group consisting of fluorine, chlorine, bromine, iodine, sulfur, hydroxyl, nitrile, and benzyl. The compound cleans oxides from the printed circuit boards (PCBs) under assembly and then volatilize with little or no need for a cleaning step, or cleaning only with water of formic acid. Very little or no undesired residue remains, such acid fluxing agents can be used mixed with typical solder formulations, such as lead/tin solder pastes, or applied topically to solder, such as solder balls; both techniques permit the assembly of PCBs more easily with high quality bonds, and with little or no residue. Malic acid is a preferred organic acid fluxing agent.

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