Sumitomo Rubber Industries Limited

Takehiro Kitaura

Hiroaki Yamada

Ai Matsuura

Subaru Toya

Lucksanaporn Tarachiwin

Hayato Yoshiyasu

Hathainat Kum-Ourm

Kamalin Kanyawararak

Masatoshi Kobayashi

Masashi Fukuchi

A chemical bond evaluation method capable of directly evaluating the presence or absence of a chemical bond between silica and a silane coupling agent includes performing multidimensional solid-state nuclear magnetic resonance (NMR) analysis on a rubber composition comprising a rubber component, a silica, and a silane coupling agent; and evaluating the presence or absence of a chemical bond between silica and the silane coupling agent in the rubber composition containing a rubber component, the silica, and the silane coupling agent.

Chemical bond evaluation method with a multidimensional solid-state nuclear magnetic resonance (NMD) analysis

The present invention provides a rubber composition for tires which provides improved abrasion resistance, and a pneumatic tire containing the rubber composition. The present invention relates to a rubber composition for tires containing a rubber component including at least 80% by mass in total of at least one of an isoprene-based rubber, a polybutadiene rubber, or a styrene-butadiene rubber, the rubber composition containing, per 100 parts by mass of the rubber component, 3 to 250 parts by mass of a reinforcing filler and 0.2 to 10 parts by mass of a specific tetrazine compound.

Rubber composition for tires and pneumatic tire

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

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Kobe, Japan

Takehiro Kitaura