Chemical apparatus and process disinfecting – deodorizing – preser – Process disinfecting – preserving – deodorizing – or sterilizing – Maintaining environment nondestructive to metal
Reexamination Certificate
2002-04-11
2008-03-04
Griffin, Walter D. (Department: 1743)
Chemical apparatus and process disinfecting, deodorizing, preser
Process disinfecting, preserving, deodorizing, or sterilizing
Maintaining environment nondestructive to metal
C526S074000
Reexamination Certificate
active
07338633
ABSTRACT:
There is described a method for applying an aqueous solution to the internal walls of a reactor, before the start of the polymerization reaction of vinyl chloride and/or vinyl acetate, which aqueous solution contains a salt of an anti-scaling agent which comprises a product of condensation of an aldehyde, a phenolic compound and an aromatic carboxylic acid hydroxylated at the aromatic nucleus, wherein the pH-value of this aqueous solution is changed, during the application, to a pH-value of less than 5 and, preferably, in the range between 2.5 and 4.5.
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“Fine Chemicals for PVC/S”; CIRS Spa; Chapter 5, 1999; pp. 64-88.
AKZO Nobel N.V.
Edwards Lydia
Griffin Walter D.
Kenyon & Kenyon LLP
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