Appeal No. 2004-0919 Page 6
Application No. 09/842,607
thereof to crosslink the polybutadiene and deforms 1.5 to 3.5 mm under a constant load
of 100 kg, and should not differ more than 10% in hardness from one another.
Saito provides (column 5, lines 16-23) that the inner layer that directly encloses
the solid core is made of a comparatively soft thermoplastic resin. The thermoplastic
resin for the inner layer includes, for example, ionomer resin, polyester elastomer,
polyamide elastomer, thermoplastic urethane elastomer, propylene-butadiene
copolymer, 1,2-polybutadiene, polybutene-1, and styrene-butadiene block copolymer.
They may be used individually or in combination with one another. Preferable among
them are ionomer resin, polyester elastomer, and blended materials thereof. Saito also
provides (column 5, line 53, to column 6, line 12) that the outer cover layer enclosing
the above-mentioned inner layer is formed from a hard thermoplastic resin. The
thermoplastic resin for the outer layer includes, for example, ionomer resin, polyester
elastomer, polyamide elastomer, thermoplastic urethane elastomer,
propylene-butadiene copolymer, 1,2-polybutadiene, and styrene-butadiene copolymer.
They may be used individually or in combination with one another. Preferable among
them are ionomer resin and polyester elastomer.
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