Sumitomo Rubber Industries Limited

Masatoshi Kobayashi

Yasuhisa Minagawa

Ai Matsuura

Lucksanaporn Tarachiwin

Hathainat Kum-Ourm

Kamalin Kanyawararak

Takehiro Kitaura

The invention provides natural rubbers having improved processability and/or abrasion resistance, rubber compositions containing the natural rubbers, and pneumatic tires formed from the rubber compositions. The invention relates to a natural rubber which shows aH-NMR spectrum where the sum of peak intensities at about 4.17, 3.94, 3.84, 3.73, 3.50, and 3.41 ppm, normalized to 10,000 for the peak intensity at about 5.11 ppm, is 8.0 or less.

Natural rubber, rubber composition and pneumatic tire

A method for predicting the resistance to heat deterioration of a sulfur-vulcanized isoprene rubber is disclosed. The nuclear magnetic resonance spectrum of the isoprene rubber is obtained by the use of a solid state nuclear magnetic resonance method employing magic angle spinning. The spectrum of a cross-linked structure &#x3b1; and the spectrum of a cross-linked structure &#x3b2; in the nuclear magnetic resonance spectrum are identified. The percentage of the cross-linked structure &#x3b1; and the percentage of the cross-linked structure &#x3b2; in the overall cross-linked structures of the sulfur are computed from the spectrum. From the computed percentages, the resistance to heat deterioration of the isoprene rubber is predicted.

Method for predicting resistance to heat deterioration of isoprene rubber

Provided are an antiozonant for polymers capable of providing excellent ozone resistance, and an ozone resistant rubber composition and an ozone resistant tire formed using the antiozonant. The present invention relates to an antiozonant for polymers, including alumina.

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Kobe, Japan

Masatoshi Kobayashi