PURPOSE: To improve the life of a tire against fatigue by using the carcass of a bias structure made of coarse threads and selected rubber between plies.
CONSTITUTION: A carcass 1 made of coarse threads of organic fibre is provided with a code diameter ho, and the average gauge hm of rubber between plies at the centre of the tire width is less than one half of the code diameter ho. The rubber between plies is made of a rubber component made by mixing 50W70pts. of carbon black with 100pts. of a mixture composed of 60W95pts. of rubber parts of natural rubber or the like and 5W40pts. of liquid polymer with 3×104W10×104 of viscosity average molecular weight. The durability of the carcass against fatigue is improved by the proper selection of the liquid polymer. Meanwhile, the scorch phenomenon for the production of a tire can be improved by the proper selection of the volume of the carbon black.
SHIMOTAKE MUNEHISA
YAMAMOTO FUJIO
| JPS547450A | 1979-01-20 | |||
| JPS5464302A | 1979-05-24 |