Celluloid-free, substantially spherical hollow body and fabrication thereof
AssigneeWeener Plastik GmbH
InventorsGerhold Flockenhagen, Matthias Prox, Liam Quaid
Life of this patent
Estimating the term…
Abstract
A substantially spherical hollow body, having a diameter of from 37 mm to 45 mm, in particular a diameter of 39.7 mm to 40.75 mm, and a weight of from 2.5 g to 3.5 g, in particular a weight of 2.6 g to 2.85 g, comprising a shell and an inner hollow space, wherein the shell has a wall thickness of 0.2 mm to 1.3 mm, in particular 0.3 mm to 0.8 mm, characterized in that the shell is free of celluloid and comprises at least one styrene-containing copolymer.
Claims19
A table tennis ball with a diameter of from 37 mm to 45 mm, and a weight of from 2.5 g to 3.5 g, comprising a shell and an internal cavity, said shell having a wall thickness of from 0.2 mm to 1.3 mm, wherein a material of the shell is free of celluloid and comprises at least one first polymer, wherein the first polymer is acrylonitrile-butadiene-styrene copolymer (ABS) and at least a second organic polymer, wherein the second organic polymer is a homopolymer of a polycarbonate, and wherein a concentration ratio of the ABS to the polycarbonate is between 0.65-0.75 to between 0.25-0.35.
A use of a styrene in a table tennis ball comprising a copolymer comprising a first polymer of acrylonitrile-butadiene-styrene copolymer (ABS) for the manufacture of a celluloid-free substantially spherical hollow body having a diameter of from 37 mm to 45 mm and a weight of from 2.5 g to 3.5 g, wherein the styrene comprising copolymer is in the form of a polymer blend, which further comprises at least a second organic polymer, wherein the second organic polymer is a homopolymer of polycarbonate, wherein a concentration ratio of the ABS to the polycarbonate is between 0.65-0.75 to between 0.25-0.35, and wherein the copolymer has a Charpy notched impact strength according to ISO 179 of from 2 kJ/m2 to 50 kJ/m2 measured at 23° C., an elasticity modulus according to ISO 527 is from 1500 MPa to 3000 MPa, and a density according to ISO 1183 is from 0.8 g/cm3 to 1.2 g/cm3.
Dependencies are inferred from the claim text.