Appeal No. 97-0816
Application 08/204,715
films may be transparent or translucent for exposing the contents
of the bag, or may be made opaque by the addition of TiO (see
2
column 5, lines 1 through 11).
Kirshenbaum discloses “a container for the storage, at or
near ambient conditions, of liquid foods subject to spoilage due
to the action of light waves, oxygen and other gaseous species”
(column 1, lines 9 through 12). The container consists of a blow
moldable thermoplastic body 12 which is opaque to light having a
wavelength in the range of between about 3500 and 5500 Angstroms
and a surrounding overwrap film 14 which prevents the diffusion
of oxygen and other gaseous species through the container. With
regard to the opaque characteristic of the body 12, Kirshenbaum
teaches that
it is preferred to employ a pigment which serves this
purpose . . . Of the additives that may be employed as
a pigment to provide opaqueness, the most preferred is
titanium dioxide. Titanium dioxide not only makes an
otherwise clear thermoplastic opaque, but, in addition,
it has the additional advantage of pigmenting the
thermoplastic white. In view of the fact that milk
represents the most important liquid food application
for the container 10 of this invention, a white
container is deemed aesthetically the most attractive.
While it has been found that a pigment
concentration of at least 0.5 percent by weight, based
on the total weight of the frame, that is, the total
weight of the thermoplastic and the pigment, is
necessary it is preferred that a somewhat greater
concentration of pigment be employed. In the case
where titanium dioxide is employed as a pigment it is
4
Page: Previous 1 2 3 4 5 6 7 8 9 Next
Last modified: November 3, 2007