| 摘要 |
PROBLEM TO BE SOLVED: To obtain a rubber composition for bead filler, which comprises an amino resin and has high hardness and high elasticity. SOLUTION: The rubber composition for tire bead filler is obtained by mixing 100 parts wt. of natural rubber (NR), polyisoprene rubber (IR), various kinds of styrene-butadiene copolymer rubbers (SBR) or combination rubber of them with 3-20 parts wt. of an amino resin represented by general formula (1) (n is an integer of≥1; R<SB>1</SB>is hydrogen or an amino group; R<SB>2</SB>is hydrogen, an amino group, a 1-20C alkyl group, a 3-20C cycloalkyl group or a 6-20C aryl group) and having≤130°C softening point by a ring and ball method and 5-20 wt.% based on the mass of the amino resin of a methylene donor. COPYRIGHT: (C)2007,JPO&INPIT
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