Patent ID: 8353793

Claim:
A seamless bladder having a combination of good air retention characteristics as well as good bounce characteristics for inflatable balls, characterized in that the bladder is made from carboxylated acrylonitrile butadiene latex and no other latex: wherein the said bladder has weight varying from about 500 mg/inch 2 to about 1.5 g/inch 2 ; wherein the said bladder has thickness varying from about 0.30 mm to 3.0 mm; and wherein carboxylated acrylonitrile butadiene latex is characterized by: acrylonitrile copolymer with medium or high acrylonitrile level varying from about 26% to about 39%; solid content varying from about 39% to about 50% of dry rubber contents; pH value varying from about 7.5 to about 8.5; viscosity varying from about 14 to about 65 mPas; surface tension varying from about 30 to about 40 mN/m.