Appeal No. 2006-0511 Page 2
Application No. 10/258,312
According to appellants, the invention is directed to a
process for producing a flexographic printing plate comprising
providing a photosensitive element including at least one
photopolymerizable elastomeric layer that comprises at least one
thermoplastic binder, at least one compound capable of addition
polymerization, and a photoinitiator, where the photopolymerizable
layer has specified properties (Brief, page 2). Representative
independent claim 1 is reproduced below:
1. A process for producing a flexographic printing
plate comprising:
i) providing a photosensitive element
comprising
a) a support;
b) at least one photopolymerizable
elastomeric layer on the support having a
composition comprising at least one
thermoplastic binder; at least one compound
capable of addition polymerization; and a
photoinitiator; wherein the layer has a melt
flow index of at least 4 grams/10 min under a
2.16 kilogram weight at 140°C, and wherein the
layer when exposed to actinic radiation to
determine a log-log plot of the dynamic storage
modulus (G’) versus frequency (f), exhibits a
slope of less than 0.18;
ii) imagewise exposing the element to
actinic radiation to polymerize areas exposed
to radiation; and
iii) thermally treating the element of ii)
to remove unpolymerized material from the
element and form a relief surface.
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