Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
CAR TIRE
Document Type and Number:
Japanese Patent JPS568704
Kind Code:
A
Abstract:

PURPOSE: To decrease the rolling resistance and increase the skid resistance of a tire by covering the surface layer of a tire tread with an anti-abrasion rubber of high skid resistance and using a rubber of low energy-loss inside the tread.

CONSTITUTION: A tire tread is shaped by laminating a cap rubber of high skid resistance with a P-value defined by P=-Re×Tg less than 2,500 and the P-value of a base rubber 1 when the modulus of repulsion elasticity measured by a Luebke repulsion elasticity meter is Re (%) and the peak-value temperature of tan δ measured by a dynamic visco-elasticity meter is Tg (°C) and a rubber 3 of low rolling resistance with a modules of lost elasticity E" not greater than 16kg/cm2 measured at 20°C, 11Hz frequency and 2% amplitude. The tread is obtained by simultaneously extruding both of the cap rubber 2 and the base rubber 1 so that their interface 6 may be corrugated in the section and the cap rubber 2 may be thickened in the groove parts of the tread.


Inventors:
ODA KEISHIROU
Application Number:
JP8307179A
Publication Date:
January 29, 1981
Filing Date:
June 29, 1979
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
TOYO TIRE & RUBBER CO
International Classes:
B60C11/00; B29C67/00; B29D30/00; B29D30/62; B32B25/00; (IPC1-7): B29H17/36; B32B25/00; B60C11/00