| 摘要 |
A chlorosulphonated ethylene-alpha-olefin copolymer having a chlorine content of 0.5-20% by weight and a glass transition temperature in differential scanning calorimetry (DSC) of -50° C. or lower and being crystalline. The chlorosulphonated ethylene-alpha-olefin copolymer is obtained by chlorinating a crystalline ethylene-alpha-olefin copolymer having a density of 890 kg/m<SUP>3 </SUP>or lower, obtained by copolymerizing alpha-olefin comprising a hydrocarbon having 4 or more carbon atoms, with ethylene, and then chlorosulphonating the chlorinated copolymer.
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