	US 7,488,789 B2
	Propylene copolymer, polypropylene composition, and uses thereof, transition metal compounds and catalyst for olefin polymerization
Shigenobu Ikenaga, Sodegaura (Japan); Keiji Okada, Sodegaura (Japan); Hiroshi Hoya, Ichihara (Japan); Norihide Inoue, Ichihara (Japan); Naritoshi Hirota, Sodegaura (Japan); Hiromu Kaneyoshi, Sodegaura (Japan); Munehito Funaya, Sodegaura (Japan); Koji Kawai, Sodegaura (Japan); Nobuo Kawahara, Sodegaura (Japan); Shinichi Kojoh, Sodegaura (Japan); Norio Kashiwa, Sodegaura (Japan); and Ryoji Mori, Sodegaura (Japan)
Assigned to Mitsui Chemicals, Inc., Tokyo (Japan)
Appl. No. 10/550,017 PCT Filed Dec. 26, 2003, PCT No. PCT/JP03/16972 § 371(c)(1), (2), (4) Date Jun. 29, 2006, PCT Pub. No. WO2004/087775, PCT Pub. Date Oct. 14, 2004.
Claims priority of application No. 2003-090161 (JP), filed on Mar. 28, 2003.
Prior Publication US 2006/0276607 A1, Dec. 07, 2006
Int. Cl. C08F 210/06 (2006.01); C08F 210/08 (2006.01); C08F 4/6592 (2006.01)

U.S. Cl. 526—348.6 [526/160; 526/165; 526/943]

4 Claims

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 (½ crystallization time) at 45° C. of 10 minutes or less, and satisfying

(6) the following relation:

146 exp(−0.022M)≧Tm≧125 exp(−0.032M)

wherein Tm represents a melting point and M (mol %) represents a content of 1-butene constituent units.