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DECISION ON APPEAL
This is an appeal under 35 U.S.C. § 134 from the decision of the examiner
finally rejecting claims 22 through 27, 35 through 41, and refusing to allow claim
4 and 43 as amended subsequent to the final rejection, which are all the claims in the
application.
BACKGROUND
Two embodiments are presented in the instant invention. One embodiment is
directed to a method for preventing scale from adhering to the inner walls of a
polymerization tank by coating the tank with an aqueous alkali solution of a modified
phenolic resin. The resin has its pH adjusted with an acid such that the pH is 0.2 to
4.0 pH units higher than the pH at which the modified phenolic resin deposits at
ambient temperature. The application of the modified phenolic resin occurs under
o
conditions wherein the temperature of the surface has been preheated to 40 C or
higher.
A second embodiment is directed to a method of producing a coating fluid by;
(1)condensing at least one phenol and at least one aldehyde in the presence of a basic
catalyst with a modifier to produce a modified resin; (2) diluting the alkaline liquid with
water; (3) adding the diluted liquid to an acid to deposit the modified phenolic resin; (4)
separating the modified phenolic resin; (5) dissolving the resin in an organic solvent
or an aqueous alkali solution.
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Last modified: November 3, 2007