Appeal No. 1998-2128
Application No. 08/628.281
Page 2
BACKGROUND
Appellants’ invention is illustrated by claim 1, reproduced
below:
1. Dry toner particles comprising a toner resin, wherein:
(i) said toner resin includes a mixture of two polymers
(A and B), said polymers A and B being chosen such
that an extruded slab with thickness 250 µm of a
50:50 mixture of both has a transmission density
(DM) being between 0.10 and 1.00 higher than the sum
of half the transmission density of a 250 µm
extruded slab of polymer A alone (DA) and half the
transmission density of a 250 µm extruded slab of
polymer B alone (DB),
(ii) said polymer A being a polyester and said polymer B
being a polyester or a styrene-acrylic copolymer
having a styrene content of more than 70 mol % and a
weight average molecular weight (MW) such that
7,000 < MW < 50,000,
(iii) said polymers A and B, included in said toner resin,
are mixed in a weight ratio 5:1 to 1:5 and
(iv) said mixture of said two polymers A and B makes up
at least 25 % by weight of said toner resin.
The prior art references of record relied upon by the
examiner in rejecting the appealed claims are:
Horie 4,837,138 Jun. 06, 1989
Morimoto et al. (Morimoto) 5, 234, 787 Aug. 10, 1993
Claims 1-4, 6, and 7 stand rejected under 35 U.S.C. § 102(b)
as being anticipated by Horie.
Claims 1-4 and 6-11 stand rejected under 35 U.S.C. § 102(e)
as being anticipated by Morimoto.
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