Appeal No. 1997-3589
Application No. 08/117,013
Yanai relates to an aqueous sizing composition comprising a water-soluble acrylic sizing agent
and a wax. The water-soluble acrylic sizing agent of Yanai is modified with a water-soluble saturated
polyester resin. (Yanai, abstract). The water-soluble polyesters are formed from dicarboxylic acids
and diols. The dicarboxylic acids may be saturated aliphatic, alicyclic or aromatic dicarboxylic acids,
such as succinic and adipic acid. (Yanai, col. 5., lines 11-16). The diols contain polyethylene glycol as
an essential ingredient and may be optionally combined with an aliphatic, alicyclic or aromatic diol, such
as polypropylene glycol. (Yanai, col. 5., lines 26-34). Suitable molecular weights for the polyethylene
glycol include 600 and 2000. (Yanai, col. 6. composition (b) and col. 7, example 1). Materials which
may be treated with the sizing composition of Yanai include yarns such as polyester filament yarns.
(Yanai, col. 6., lines 21-28). As is known in the art, textile sizes provide improved or increased
strength, stiffness, smoothness or weight to filaments. Indeed, the composition of Yanai improved the
weaving efficiency of treated filaments over conventional oiling agents. (Yanai, col. 7, lines 34-42).
Yanai, however, lacks any mention or suggestion that the water-soluble acrylic sizing agent will lubricate
the filaments and provide for the necessary slip.
Fujita, U.S. Patent No. 4,968,776
Fujita discloses sizing agents for glass fibers. The sizing agents contain a compound having a
weight average molecular weight of not less than 20,000 prepared by reacting a polyhydroxy
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