Appeal No. 1997-1498
Application No. 08/251,148
only are the specific ingredients recited in the claims on
appeal required, but also
specific proportions of those ingredients are necessary. In
other words, the limitation “a visually clear blend of
thermoplastic polymers” limits the claimed compositions to
those compositions having only those specific proportions of
the claimed ingredients, which are capable of forming a
visually clear blend of thermoplastic polymers.
As found by the examiner, Minnick discloses polymer
blends comprising a polyetherimide and at least one polyester
resin derived from a cyclohexanedimethanol and a carbocyclic
acid or ester. See column 1, lines 50-55. The carbocyclic
acid, according to Minnick, generically refers to any organic
compound whose carbon skeleton forms at least part of a closed
ring. See column 5, lines 40-46. Although Minnick indicates
that iso and terephthalic acids are the preferred carbocyclic
acids (see column 3, lines 15-20 and columns 7 and 8, example
2 and the Table), it also mentions 2, 6-
naphthalenedicarboxylic acid as one of the carbocyclic acids
useful for forming a polyester resin (see column 5, lines 53-
9
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