Butene copolymer, resin composition comprising the copolymer and moldings of thecomposition, and solid titanium catalyst for producing the copolymer and method for preparing the catalyst

摘要

A butene copolymer of specified tensile modulus, molecular weight distribution, intrinsic viscosity and melting point wherein an alpha -olefin having 2 to 10 carbon atoms, excluding 1-butene, is contained in a specified amount, a resin composition comprising the butene copolymer, and a molded item therefrom. The butene copolymer and resin composition are highly useful, in particular, as a resin for pipe molding because molding thereof provides a molded item which is excellent in not only heat resistance, low-temperature properties and handling easiness but also thermal creep properties. Further, there are provided a solid titanium catalyst for producing a polymer of an alpha -olefin having 4 or more carbon atoms, including the above butene copolymer, which solid titanium catalyst comprises magnesium, titanium, a halogen, a specified ether compound, a hydrocarbon and a solubilizing agent, and a process for producing such an alpha -olefin polymer.