| abstract |
A butene copolymer, characterized in that it has a specific modulus of elasticity in tension, molecular weight distribution, limiting viscosity and melting point, and comprises a copolymer unit derived from 1-butene and a copolymer unit derived from an a-olefin having 2 to 10 carbon atoms (except 1-butene); a resin composition comprising the butene copolymer and moldings thereof; and a method for preparing a solid titanium catalyst for producing a polymer from a α-olefin having 4 or more carbon atoms including the above butene polymer, which comprises magnesium, titanium, a halogen, a specific ether compound, a hydrocarbon and a solubilizing agent, and a method for producing an olefin polymer using the catalyst. Moldings from the above copolymer or resin composition are excellent in thermal resistance, low temperature characteristics and handleability, and further exhibits excellent resistance to creep at a high temperature. Accordingly, the copolymer and the resin composition can be advantageously utilized as a resin for molding a pipe. |