Appeal No. 1998-3281
Application 08/650,500
hydrophobic to enable dispersion of the pigment in the ink
vehicle and the hydrophile is sufficiently hydrophilic to enable
the polymer to be soluble in the ink vehicle (page 18, lines 6
through 10). The repeating unit of polymer (b) has an HLB
(hydrophile/lipophile balance) of from about 8 to 30 (page 18,
lines 10 through 13). Useful molecular weights for polymer (b)
may be as high as 500,000 or as low as dimers of the monomers
defining polymer (b) with preferred molecular weights from about
2,000 to about 50,000 (page 18, lines 17 through 25). On page 21,
appellant discloses that useful (b) polymers are commercially
available as the proprietary product known as DAPRAL GE 202,
available from Akzo Chemie America, Chicago, Illinois. The prior
art cited by appellants at pages 5, 6 and 7 of the specification
show DAPRAL GE 202 to be a an ethoxylated maleic anhydride/alpha-
olefin copolymer and to have been commercially available at least
since 1992. All appellant's examples utilize DAPRAL GE 202 as
the polymer in appellant's ink composition and the polymer
claimed in claims 16 and 21 is DAPRAL GE 202.
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