Appeal No. 2001-0008
Application 09/298,572
The hardener component in conventional powder
coating compositions is typically a compound having epoxy
groups. Claim 1 specifies that the hardener component is
one or more than one epoxy resin with a molecular weight of up
to 1500. Claim 1 further requires that the epoxy resin is a
cycloaliphatic polyglycidyl polycarboxylate or a mixture
thereof and that the cyclo- aliphatic polyglycidyl
polycarboxylate is selected from the group consisting of
diglycidyl hexahydrophthalate, diglycidyl hexa-
hydroterephthalate, triglycidyl 1,2,4-
cyclohexanetricarboxylate
and triglycidyl 1,3,5-cyclohexanetricarboxylate. According to
the inventor, the claimed powder coating compositions harden
quickly and completely and have good flow properties at low
temperatures comparative to prior art coating compositions.
(Specification, page 1.) Claim 1 requires that “the coating
composition flows and cures at temperatures in the range of
about 100EC to about 150EC to a smooth form.” In contrast,
conventional prior art powder coatings are typically used at
temperatures above 160EC because of poor flow characteristics
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