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Patent Searching and Data


Title:
PNEUMATIC TIRE AND ITS PRODUCTION
Document Type and Number:
Japanese Patent JPH06145428
Kind Code:
A
Abstract:

PURPOSE: To provide a pneumatic tire enabling to reduce its weight by the decrease in the amount of a tread rubber and simultaneously improve the abra sion resistance performance, low rolling performance and wet grip performance, and to provide a method for producing the same.

CONSTITUTION: An unvulcanized rubber composition A having a glass transition point in a temperature range of ≥-40°C is vulcanized to a semivulcanized state. The semivulcanized rubber composition A is mixed with an unvulcanized rubber composition B having a glass transition point in a temperature range of <-40°C in a weight distribution rate of ≤50% in a closed mixing machine. The mixed rubber composition A+B is processed into the tread part of a green tire, which is molded and vulcanized in a mold. The averaging of glass transition points between the matrix of the rubber composition B and the dispersion layer of the rubber composition A is prevented, and therefore plural peaks are related to the temperature dependence of a dissipation factor tan δ.


Inventors:
NAKAKITA KAZUMASA
Application Number:
JP30012592A
Publication Date:
May 24, 1994
Filing Date:
November 10, 1992
Export Citation:
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Assignee:
YOKOHAMA RUBBER CO LTD
International Classes:
B29B7/82; B29C35/02; B29D30/52; C08L21/00; B29K21/00; B29K105/24; B29L30/00; (IPC1-7): C08L21/00; B29C35/02; B29D30/52; C08L21/00
Attorney, Agent or Firm:
Shinichi Ogawa (2 outside)