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Patents

ROHM AND HAAS PATENTS

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By: KERRY PIANOFORTE

Editor, Coatings World, Coatings World

Patent No. U.S. 6,855,403
Rohm and Haas Company has
received a patent for a method for
preparing a multi-layer coating composition.
It is comprised of applying a
first-coating composition to a substrate
wherein the first-coating composition
comprises a polymer product
having a gel fraction of 0.3 to 0.95 in
a solvent selected from one or more of
acetone and tetrahydrofuran, and
wherein the first-coating composition
is applied in one or more separate
applications, allowing the first-coating
composition to dry after each
application; and applying a secondcoating
composition onto the dried
first-coating, wherein the secondcoating
composition comprises a polymer
product having a gel fraction of
greater than 0.95 and up to 0.99 in a
solvent selected from one or more of
acetone and tetrahydrofuran and
wherein the second-coating composition
is applied in one or more separate
applications, allowing the second-
coating composition to dry after
each application

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