Appeal 2007-2137
Application 10/472,911
1. Leese describes a composite plastic sheet having a base layer (core
layer) of the type having voids created by stretching the sheet. As
stated in Leese,
The core layer may comprise any stretch-voidable
composition but is preferably a composition such as is
described in our published GB-A-1470372 [King] and GB-
A-1492771. More preferably, the composition of the core
material comprises a blend of an orientable thermoplastics
olefin polymer with at least one metal resinate which is 2 to
502 [sic; 50%] by weight calculated on this blend and is at
least partially incompatible with the olefin polymer.
(Leese, p. 3, ll. 17-20).
2. Leese does not specify any particular levels of density for the core
layer of the sheet.
3. Leese suggests the use of the composition of King for the core layer
(FF 1). King describes polymer compositions which are a blend of an
orientable thermoplastic and 2 to 50% metal resinate or a modified or
unmodified rosin ester (King, p. 2, ll. 11-16).
4. King exemplifies sheets stretched from compositions including
thermoplastic and metal resinate. Some of the exempilified sheets
have densities within the claimed ranges (e.g., Exs. 1 and 2) but some
do not (see, e.g., Ex. 3; Table III).
5. The density of the stretched sheet formed from the stretch-voidable
composition depends on many factors including the concentration of
metal resinate (King, Ex. 3, Table III) and stretching parameters such
as the amount the sheet is stretched (King, p. 3, ll. 15-30).
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Last modified: September 9, 2013