To provide a thermosetting urethane elastomer composition which is excellent in the liquid stability of its hardener and is capable of manufacturing a paper feeding roll excellent in the mechanical properties and surface characteristics.
The composition consists of (A) the chief agent containing an NCO group-terminated urethane prepolymer obtained by the reaction of an MDI (diphenylmethane diisocyanate)-based isocyanate and PTMG (polyoxytetramethylene glycol), having an NCO content of 5-15% and a viscosity at 75°C of 1,000 mm2/s or less and of (B) a hardener containing (B1) a long chain diol comprising PTMG, (B2) a short chain diol containing 2-methyl-1,3-propanediol in a proportion of more than 50% by mass, (B3) a short-chain triol comprising the essential component of TMP (trimethylolpropane), (B4) a catalyst comprising DMI (1,2-dimethylimidazole) and (B5) a temperature-sensitive catalyst comprising a bicyclic tertiary diamine (salt), with a ratio of [(B1)/[(B2)+(B3)]] being 80/20-95/5 (by mass) and with a ratio of [(B2)/(B3)] being 55/45-95/5 (by mass).
HAYASHI TATSUYA
GOTO JUNJI
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