Abstract: The present invention relates to a production process for a phenols novolac resin obtained by reacting phenols with formaldehydes, wherein they are reacted in the presence of a metal compound used as a catalyst for the reaction described above, and a chelating agent is further added in order to deactivate a catalytic action of the metal compound and a resin-coated sand prepared by using the above phenols novolac resin. It is possible to provide a process for producing a phenols novolac resin having an ortho rate of 30 to 60%, suitably 40 to 55% at a good yield (70% or more) and a resin-coated sand having a high curing property prepared by using the above phenols novolac resin.

Abstract: There are disclosed a water-soluble flux composition which comprises a water-soluble binder and an activating agent comprising at least one compound selected from the group consisting of a sulfonic acid compound, a sulfuric acid compound, a sulfamic acid compound, a multi-valent carboxylic acid compound and a persulfuric acid compound, and a process for producing an IC part or an electronic part which comprises the steps of coating the water-soluble flux composition on a terminal of the IC part or the electronic part and subsequently soldering the terminal.