| abstract |
An object of the present invention is to provide crystalline high α-olefin copolymers which have excellent compatibility with thermoplastic resins, especially polyolefins, and compatibility with lubricant oils, fuel oils or waxes, excellent miscibility with inorganic fillers and secondary processability, and which have narrow temperature ranges for melting and crystallization, and to provide a process for preparation thereof. The present invention provides a crystalline higher α-olefin copolymer obtained by copolymerizing at least two higher α-olefins having 10 or more carbon atoms or at least one higher α-olefin having 10 or more carbon atoms with at least one other olefin, wherein it satisfies the following (1) to (3): (1): the content of higher α-olefin units is 50 mol % or greater, n (2): the melting point (Tm) which is measured, by using a differential scanning calorimeter (DSC), from the melting endothermic curve obtained by maintaining the copolymer at 190° C. for 5 minutes under a nitrogen atmosphere, cooling it to −10° C. at a rate of 5 ° C./min, maintaining it at −10° C. for 5 minutes, and then elevating its temperature to 190° C. at 10 ° C./min is in the range of 20 to 100° C., and (3): in the intensity distribution of wide-angle X-ray scattering, a single peak X1 resulting from crystallization of side chains is observed at 15 deg<2θ<30 deg. |