Manufacturing method for phenolic novolac resin and resin-coated sand
AssigneeHitachi Chemical Company, Ltd.
InventorsHiroyuki Kawata, Sadao Takeshou, Tetsurou Saikawa
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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.
Claims6
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 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.
Dependencies are inferred from the claim text.