a-OLEFIN POLYMER AND PROCESS FOR PRODUCTION THEREOF

摘要

Disclosed is an a-olefin polymer having excellent balance between a molecular weight and a melting point, which is a polymer of at least one a-olefin having 20 to 40 carbon atoms, and which meets the following requirements (1) to (4): (1) a molecular weight distribution (Mw/Mn) calculated based on a weight average molecular weight (Mw) and a number average molecular weight (Mn) in terms of polystyrene is 2 or less as determined by GPC method and Mw is 5000 or less; (2) the measurement of melting point (Tm) by DSC shows a single melting peak, the melting heat absorption (?H) as calculated based on the area of the melting peak is 20 J/g or more, and the half-width value of the melting peak is 10°C or lower; (3) when Mw is 1000 to 5000 and the average number of carbon atoms (Cn) is 20 to 40, Mw and Cn and Tm as determined by DSC satisfy the requirement represented by the formula: 0.0025 x Mw + (Cn x 3.3812 - 29.5) = Tm = 0.0025 x Mw + ((Cn + 1) x 3.3812 - 29.5); and (4) a stereoregularity index [M₂] originated from a part having a C_20-40 a-olefin bound thereto is 20 mol% or more.