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THE CLAIMS
Claims 22 and 43 are illustrative of appellants’ invention and are reproduced
below.
22. A method of producing a coating fluid to be applied to the
surfaces of parts of a polymerizing apparatus that will come into contact with
vinyl
monomer which is to be polymerized in an aqueous medium or subjected to
mass-polymerization so that the produced vinyl chloride polymer is prevented
from adhering to said surfaces, which method comprises modifying an initial
condensate obtained by condensing at least one phenol and at least one aldehyde in
the presence of a basic catalyst with a modifier to produce a modified
phenolic resin, diluting the obtained alkaline liquid with water so that the
concentration of said reaction product has a prescribed value, adding the diluted
liquid to an acid to adjust the pH thereby depositing said modified phenolic resin, and
separating the deposited modified phenolic resin and dissolving said modified
phenolic resin in an organic solvent or an aqueous alkali solution having a pH
for dissolving said modified phenolic resin.
43. A method of preventing scale from adhering to the inner wall
surfaces of a polymerization tank and the like used in the polymerization of vinyl
chloride monomers, comprising:
preparing an aqueous coating fluid which is an aqueous alkali solution
containing a modified phenolic resin in an amount of 0.1 to 10.0 wt. %
and having a pH adjusted with an acid to a pH of 0.2 to 4.0 higher than the pH at
which the modified phenolic resin deposits at ambient temperature; and
applying the coating fluid to the surfaces wherein the temperature of
the surfaces has been previously elevated to 40EC or over and wherein the
modified phenolic resin is deposited from the aqueous coating fluid and adhered
to the surfaces.
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Last modified: November 3, 2007