US 12,290,722 B2
Aqueous adhesive for tennis ball
Sho Goji, Kobe (JP); Takehiko Hyodo, Kobe (JP); and Kazuyoshi Shiga, Kobe (JP)
Assigned to Sumitomo Rubber Industries, Ltd., Hyogo (JP)
Filed by Sumitomo Rubber Industries, Ltd., Hyogo (JP)
Filed on Mar. 2, 2022, as Appl. No. 17/684,572.
Claims priority of application No. 2021-033950 (JP), filed on Mar. 3, 2021.
Prior Publication US 2022/0280841 A1, Sep. 8, 2022
Int. Cl. A63B 39/08 (2006.01); C09J 109/00 (2006.01); A63B 102/02 (2015.01)
CPC A63B 39/08 (2013.01) [C09J 109/00 (2013.01); A63B 2102/02 (2015.10)] 10 Claims
OG exemplary drawing
 
1. A tennis ball comprising:
a core;
two pieces of felt covering the core; and
a seam positioned in a gap between the two pieces of the felt, wherein
the seam is formed of an aqueous adhesive,
the aqueous adhesive comprises rubber latex,
the rubber latex is a mixture of liquid rubber latex and solid rubber latex,
a ratio of liquid rubber to an entire rubber component contained in the rubber latex is greater than 20% by weight and less than 90% by weight in terms of solid content, and
a Mooney viscosity (ML1+4 (100° C.)) of a rubber component comprising the liquid rubber latex and the solid rubber latex is not greater than 6.0.