초록 ▼

A propylene/1-butene random copolymer containing 60 to 90 mol % of propylene units and 10 to 40 mol % of 1-butene units and has a triad isotacticity of not less than 85% and not more than 97.5%, a molecular weight distribution of from 1 to 3, an intrinsic viscosity of from 0.1 to 12 dl/g, a melting

A propylene/1-butene random copolymer containing 60 to 90 mol % of propylene units and 10 to 40 mol % of 1-butene units and has a triad isotacticity of not less than 85% and not more than 97.5%, a molecular weight distribution of from 1 to 3, an intrinsic viscosity of from 0.1 to 12 dl/g, a melting point of from 40 to 75�� C. and a crystallization rate at 45�� C. of 10 minutes or less, and satisfying the following relation, 146 exp (-0.022M)≧Tm≧125 exp (-0.032M), and an olefin catalyst for preparation thereof.

대표청구항 ▼

What is claimed is: 1. A propykne/1-butene random copolymer (PBR) comprising: (1) 60 to 75 mol % of units derived from propylene and 25 to 40 mol % of units derived from 1-butene, and having (2) a triad isotacticity, as determined from a 13C-NMR spectrum, of not less than 85% and not more than 97.5

What is claimed is: 1. A propykne/1-butene random copolymer (PBR) comprising: (1) 60 to 75 mol % of units derived from propylene and 25 to 40 mol % of units derived from 1-butene, and having (2) a triad isotacticity, as determined from a 13C-NMR spectrum, of not less than 85% and not more than 97.5%, (3) a molecular weight distribution (Mw/Mn), as determined by gel permeation chromatography (GPC), from 1 to 3, (4) an intrinsic viscosity, as measured in decalin at 135�� C., from 0.1 to 12 dl/g, (5) a melting point (Tm), as measured on a differential scanning calorimeter, from 40 to 66.5�� C. and a crystallization rate (�� crystallization time) at 45�� C. of 10 minutes or less, and satisfying (6) the following relation: description="In-line Formulae" end="lead"146 exp(-0.022M)≧Tm≧125 exp(-0.032M)description="In-line Formulae" end="tail" wherein Tm represents a melting point and M (mol %) represents a content of 1-butene constituent units. 2. The propylene/1-butene copolymer according to claim 1 obtained by polyinerizing propylene and 1-butene in the presence of an olefin polymerization catalyst comprising: a transition metal compound (1a) represented by the following formula (1a) in which R3 is selected from a hydrocarbon group and silicon-containing group; R1, R2 and R4 are identically or differently selected from hydrogen, a hydrocarbon group and silicon-containing group; R5, R6, R7, R8, R9, R10, R11, R12, R13 and R14 are identically or differently selected from hydrogen, a hydrocarbon group and silicon-containing group; adjacent substituent groups R5 to R12 may be linked each other to form a ring; R13 and R14 may be the same or different from each other and may be linked to form a ring; M is a Group 4 transition metal; Y is a carbon atom; Q may be identically or differently selected from halogen, a hydrocarbon group, anion ligand or neutral ligand capable of coordination with a lone pair of electrons, and j is an integer of 1 to 4, an organoaluminum oxy-compound (1b) and/or a compound (2b) capable of forming an ion pair by reacting the transition metal compound (1a) and optionally an organoaluminum compound (c). 3. The propylene/1-butene random copolymer according to claim 1, wherein the crystallization rate (�� crystallization time) at 45�� C. is 7 minutes or less. 4. The propylene/1-butene random copolymer according to claim 1, wherein the crystallization rate (�� crystallization time) at 45�� C. is 5.2 minutes or less.