| 摘要 |
1-butene based polymer satisfying following requirements (1'') to (4'') provides formed product having low stickiness, superior flexibility and transparency. (1'') Crystalline resin having melting point (Tm-P), not observed or in the range of 0 to 100° C., wherein said melting point defined as the peak top of the peak observed in the highest temperature zone of the melting heat absorption curve obtained by heating a sample of said polymer at a rate of 10° C./minute using Differential Scanning Calorimeter (DSC), after melting said sample in advance at 190° for 5 minutes under nitrogen atmosphere, followed by cooling it to -10° C. at a rate of 5° C./minutes, and keeping it at -10° C. for 5 minutes. (2'') Stereoregularity index {(mmmm)/(mmrr+rmmr)} is at most 20. (3'') Molecular weight distribution (Mw/Mn) measured by Gel Permeation Chromatography (GPC) method is at most 4.0. (4'') Weight average molecular weight (Mw) measured by GPC method is in the range of 10,000 to 1,000,000.
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