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AssigneeMitsui Chemicals, Inc.
InventorsTeruo Yuasa, Hiroaki Narisawa, Masahiro Kaneko
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Preparation process for a novolak aralkyl resin having excellent heat resistance and curing property by reacting 0.4 to 0.8 mol of an aralkyl compound based on one mol of the low molecular weight novolak containing 90% by weight or more of bi-nuclear novolak in the presence of an acidic catalyst, the process comprising at first melting the low molecular weight novolak, heating it up to a reaction temperature, then adding 0.001 to 0.05% by weight of the acidic catalyst to the total amount of the low molecular weight novolak and the aralkyl compound, then continuously adding the aralkyl compound for reaction, neutralizing the residual acidic catalyst after the completion of the reaction, a novolak aralkyl resin obtained by the preparation process and a novolak aralkyl resin composition containing said resin.
A preparation process for a novolak aralkyl resin by reacting 0.4 to 0.8 mol of an aralkyl compound based on one mol of a low molecular weight novolak containing 90% by weight or more of a bi-nuclear novolak in the presence of an acidic catalyst, wherein comprising at first melting the low molecular weight novolak and heating it up to a reaction temperature, then adding 0.001 to 0.05% by weight of the acidic catalyst based on the total amount of the low molecular weight novolak and the aralkyl compound, then continuously adding the aralkyl compound for reaction, neutralizing the residual acidic catalyst after the completion of the reaction.
A novolak aralkyl resin composition containing 80 to 95% by weight of the novolak aralkyl resin as defined in claim 5 and 5 to 20% by weight of hexamethylenetetramine.
A novolak aralkyl resin composition containing 5 to 20% by weight of the resin composition as defined in claim 7 and 80 to 95% by weight of at least one molding base material selected from the group consisting of reinforcing fibers, lubricants and fillers.
A novolak aralkyl resin composition containing 30 to 70% by weight of the resin composition as defined in claim 7 and 30 to 70% by weight of at least one solvent selected from the group consisting of methanol, ethanol, methyl ethyl ketone, butyl cellosolve and butyl carbitol.
A novolak aralkyl resin composition containing 10 to 75% by weight of the novolak aralkyl resin as defined in claim 5, 25 to 90% by weight of an epoxy resin and 0.01 to 5% by weight of a curing catalyst based on the total amount of both of the resins.
Dependencies are inferred from the claim text.