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Patent No. U.S. 6,844,406 B2

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By: KERRY PIANOFORTE

Editor, Coatings World, Coatings World

Patent No. U.S. 6,844,406 B2
Valspar Sourcing, Inc. has received a
patent for a process for preparing low
molecular weight, high functionality
number polymers. It is comprised of
heating to a temperature between
130°C-180°C a mixture comprised of
one or more ethylenically unsaturated
monomers; an initiator system comprising
a compound selected from the group
consisting of persulfates, peroxides, diazos,
and combinations thereof; a substantially
aprotic solvent system; and
maintaining the temperature of the
mixture for a time sufficient to polymerize
the monomers to a monomer to
polymer conversion percentage of at
least 95% by weight, wherein the polymer
has a weight average molecular
weight between approximately 900 and
7,000 Dalton, a hydroxyl number of at
least 240 and an acid number greater
than 240.

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