SOLDERING FLUX
    4.
    发明专利

    公开(公告)号:GB1301076A

    公开(公告)日:1972-12-29

    申请号:GB1482571

    申请日:1971-05-13

    Applicant: IBM

    Abstract: 1301076 Solder flux INTERNATIONAL BUSINESS MACHINES CORP 13 May 1971 [27 July 1970] 14825/71 Heading C7M [Also in Division C4] A solder flux comprises a rosin and a cationic fluorocarbon, preferably 20-68% weight resin, 0À01-1% weight fluorocarbon and the balance organic solvent or 99-99À99% rosin and 0À1-1% fluorocarbon. The fluorocarbon has the general formula YCF 2 (CF 2 ) p - X where Y is a moiety to complete the fluorocarbon chain such as H or F, X is a solubilizing group and p is a positive integer. The fluorocarbon is preferably (1) a quaternary ammonium fluorocarbon, (2) an ammonium fluorocarboxylate or (3) a perfluorocarboxylic acid or its salts which have the following general formulae:- (1) Cn F 2n+1 CONHC 3 H 6 N(CH 3 ) q C r H 2r+1 X where n is 6 to 9, q is 2 or 3, r is 0 to 2 and X is a halide. (2) H(CF 2 ) n COONH 4 where n is 8 or 10. (3) HCF 2 (CF 2 ) s COOM where S is 5 to 8 and M is hydrogen or a group forming a salt. The rosin is preferably water white rosin and the prefered organic solvent is a C 1 to C 3 primary alcohol e.g. isopropyl alcohol. Acetone, 2-ethoxyethanol and ethylene glycol may also be used. The flux preferably contains 2-3% glycerine. The flux may be used as a liquid, paste, coating or as a powder. The exemplified flux contains in weight per cent 37À99% water white rosin, 60% isopropyl alcohol, 2% glycerine and 0À01% F(CF 2 ) 7 CONHC 3 H 6 N(C 2 H 5 )CHI. It is primarily used in electronics for soldering Cu, Sn, Sn-Pb, Au or Ag.

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