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Table tennis ball and table tennis ball-use thermoplastic resin composition

A technology of thermoplastic resin and table tennis, applied in applications, rackets, balls, etc., can solve problems such as low speed, increased mistakes, and changes in playing sound, and achieve an excellent balance effect

Active Publication Date: 2015-12-09
NIPPON TAKKYU +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] Compared with when hitting lightly, the change of raw materials has a more significant effect when hitting hard, resulting in changes in the sound of the ball, lower speed, more mistakes, etc., and unexpected failures are likely to occur during the game

Method used

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  • Table tennis ball and table tennis ball-use thermoplastic resin composition
  • Table tennis ball and table tennis ball-use thermoplastic resin composition
  • Table tennis ball and table tennis ball-use thermoplastic resin composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0103] In order to describe the present invention more specifically, examples and comparative examples are given below, but these examples do not limit the present invention in any way. The table tennis balls shown in Examples and Comparative Examples are made by joining hollow hemispherical molded products obtained by injection molding by a method suitable for each raw material and complying with the standards stipulated in ITTF Technical Standard T3. size ping pong ball. In addition, here, unless otherwise specified, "%" means weight%, and "part" means a weight part.

[0104] First, raw materials, evaluation methods in Examples and Comparative Examples will be described.

[0105] (1) Average particle diameter of the rubbery polymer (a)

[0106] Using the sodium alginate method described in "RubberAgeVol.88p.484-490 (1960), byE.Schmidt, P.H.Biddison", that is, using the different particle sizes of polybutadiene that is creamed according to the concentration of sodium algina...

reference example 1

[0121] [Reference Example 1] Graft Copolymer Containing Rubber (I-1)

[0122] 150 parts by weight of pure water, 0.5 parts by weight of glucose, 0.5 parts by weight of sodium pyrophosphate, 0.005 parts by weight of ferrous sulfate, and 45 parts by weight (in terms of solid content) were put into the nitrogen-substituted reactor, and the average particle diameter was 1.00 μm. The poly(butadiene-styrene) latex (weight ratio of styrene and butadiene is 25 / 75), while stirring, the temperature in the reactor was raised to 65°C. The time when the internal temperature reached 65° C. was regarded as the start of polymerization, and 39 parts by weight of styrene, 16 parts by weight of acrylonitrile, and 0.2 parts by weight of a chain transfer agent mixture of t-dodecyl mercaptan were continuously added over 4 hours. Simultaneously, an aqueous solution containing 0.2 parts by weight of cumene hydroperoxide and potassium oleate, a polymerization initiator, was continuously added over 7 h...

reference example 2

[0123] [Reference Example 2] Graft Copolymer (I-2) Containing Rubber

[0124] 150 parts by weight of pure water, 0.5 parts by weight of glucose, 0.5 parts by weight of sodium pyrophosphate, 0.005 parts by weight of ferrous sulfate, and 60 parts by weight (in terms of solid content) of the average particle diameter of 0.35 μm were put into the nitrogen-substituted reactor. The polybutadiene latex was stirred, and the temperature in the reactor was raised to 65°C. The polymerization started when the internal temperature reached 65° C., and 28 parts by weight of styrene, 12 parts by weight of acrylonitrile and 0.2 parts by weight of a chain transfer agent t-dodecyl mercaptan mixture were continuously added over 4 hours. Simultaneously, an aqueous solution containing 0.2 parts by weight of cumene hydroperoxide and potassium oleate, a polymerization initiator, was continuously added over 7 hours to complete the reaction. Add 1 part by weight of 2,2'-methylene bis(4-methyl-6-tert-b...

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Abstract

Disclosed is a table tennis ball which, without using celluloid, is capable of faithfully reproducing playing characteristics of a celluloid table tennis ball, as well as a table tennis ball-use thermoplastic resin composition capable of being used for manufacture of a table tennis ball superior in balance among modulus of elasticity, shock resistance, and density. A table tennis ball has flexural modulus according to ISO 178 that is greater than or equal to 1650 MPa, Charpy impact strength according to ISO 179 that is greater than or equal to 20 kJ / m2, and density according to ISO 1183 that is less than 1.20 g / cm3,comprises a thermoplastic resin or a thermoplastic resin composition that does not include celluloid, is of a diameter of greater than or equal to 39.0 mm, and is of a weight from 2.0 to 3.5 g.

Description

technical field [0001] The present invention relates to a celluloid-free table tennis ball and a thermoplastic resin composition for table tennis that faithfully reproduce the playing characteristics of a table tennis ball made of celluloid. Background technique [0002] Celluloid has been used as a raw material for table tennis balls since the 1930s. However, celluloid is extremely flammable, and has problems such as being easily ignited by friction or the like, easily degraded by light or the like, and has low durability. Therefore, in factories that dispose of celluloid, celluloid is often the cause of fires due to self-reactive ignition, and is designated as a flammability control object (category 5 hazardous substance) in Japan's Fire Service Act, and strict regulations are imposed on its manufacture. , storage and disposal methods. [0003] In addition, if celluloid is affected by light, oxygen, etc. for a long time, it will decompose and deteriorate into cellulose a...

Claims

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Application Information

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IPC IPC(8): A63B39/00
CPCA63B39/00A63B39/08A63B45/00A63B2039/003A63B2102/16A63B2209/00B29D22/04C08L9/06C08L51/00C08L2205/03
Inventor 望月秀宪江川仁佐藤哲高崎忠胜户木悟史
Owner NIPPON TAKKYU
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