Appeal No. 1996-1371
Application 08/221,595
the rejection over the combination.
In rejecting the claims under 35 U.S.C. § 103 the examiner urges that it would have
been obvious to modify the toner composition of Sacripante by adding ingredients,
including an additional resin, and cites Alexandrovich as disclosing (Answer, page 7):
monomers for the production of the polyesters such as monomers having a
benzenesulfonate groups and a phosphonium group so that the sulfonate
group is covalently bonded to an ester group (col. 6. 1. 67 -col. 7, 1. 26).
These polymers serve as both a charge control agent and a binder resin.
These polymers are used with other polymers if desired (col. 8, 1.19-34) and
colorants (col. 8, . 35-36). The toners of the reference are mixed with
carriers having a polymer coating such as poly(vinylidene fluoride) where the
carrier core is made of ferrites (col. 9, l. 11-61). The developer is used to
develop electrostatic latent images whereby the toner image is transferred to
a support (col. 10, l. 6-25).
The examiner cites Diamond as disclosing (Answer, page 7):
that rheology is a known concern in the toner art (p. 170, §4.3.1). The
reference states that the prime control of toner fusing is the toner resin
(p.168, l. 5-7; p. 171, l. 17-24). The reference also states that mixtures of
copolymers with varying composition and molecular weight controls rheology
(p.171, l. 35-36).
The examiner concludes (id):
It would have been obvious to one having ordinary skill in the art at the time
of the invention was made to combine another resin with the polyester and
colorant disclosed by Sacripante because Alexandrovich discloses that
additional resins may be combined with charge controlling polymers and
colorants in order to form particulate toners. The addition of the other
polymers would control fixing property of the toner upon a suitable substrate
(see Alexandrovich col. 10, l. 6-25; Sacripante examples showing
development; Diamond citation). The additional resin would be particulate
because it would be in the toner particle with the charged controller and the
5
Page: Previous 1 2 3 4 5 6 7 8 9 10 11 Next
Last modified: November 3, 2007