Process for preparing ethylene copolymers

United States Patent m

Tsutsui et al.

US005525689A [ii] Patent Number: [45] Date of Patent:

5,525,689 Jun. 11, 1996

[54] PROCESS FOR PREPARING ETHYLENE COPOLYMERS

[75] Inventors: Toshiyuki Tsutsui; Ken Yoshitsugu;

Akinori Toyota, all of Kuga-gun, Japan

[73] Assignee: Mitsui Petrochemical Industries, Ltd.,

Tokyo,Japan

[21] Appl. No.: 458,696

[22] Filed: Jun. 2, 1995

Related U.S. Application Data

[60] Continuation of Ser. No. 151,990, Nov. 15, 1993, abandoned, which is a division of Ser. No. 901,972, Jun. 22, 1992, Pat. No. 5,336,746, which is a division of Ser. No. 459,834, filed as PCT/JP89/01281, Dec. 21, 1989, abandoned.

[30] Foreign Application Priority Data

Dec. 26, 1988 [JP] Japan 328731

Dec. 26, 1988 [JP] Japan 328732

Dec. 26, 1988 [JP] Japan 328734

Jan. 24, 1989 [JP] Japan 14596

Jul. 21, 1989 [JP] Japan 189044

[51] Int. CI.6 C08F 4/643; C08F 210/14

[52] U.S. CI 526/160; 526/127; 526/128;

526/165; 526/348; 526/348.2

[58] Field of Search 526/129, 160,

526/165, 127, 128

[56] References Cited

U.S. PATENT DOCUMENTS

FOREIGN PATENT DOCUMENTS

109779 5/1984 European Pat. Off. . 123510 10/1984 European Pat. Off. . 141597 6/1985 European Pat. Off. .

OTHER PUBLICATIONS

Patent Abstracts of Japan, vol. 12, No. 444 (C-545) [3291], Nov. 22, 1988, JP 63-168407, (Showa), Jul. 12, 1988. Patent Abstracts of Japan, vol. 12, No. 450 (C-547) [3297], Nov. 25, 1988, JP 63-175004, (Mitsui), Jul. 19, 1988. Patent Abstracts of Japan, vol. 11, No. 349 (C-456) [2796], Nov. 14, 1987, JP 62-121707 (Mitsui), Jun. 3, 1987. Patent Abstracts of Japan, vol. 11, No. 394 (C-465) [2841], Dec. 23, 1987, JP 62-153307 (Sumitomo), Jul. 8, 1987. Patent Abstracts of Japan, vol. 11, No. 251 (C-440) [2698], Aug. 14, 1987, JP 62-57406 (Mitsui), Mar. 13, 1987. Patent Abstracts of Japan, vol. 11, No. 349 (C-456) [2796], Nov. 14, 1987, JP 62-119212 (Mitsui), May 30, 1987.

Primary Examiner—Fred Teskin

Attorney, Agent, or Firm—Sherman and Shalloway

[57] ABSTRACT

In accordance with the present invention, there are provided ethylene copolymers composed of structural units (a) derived from ethylene and structural units (b) derived from oc-olefin of 3-20 carbon atoms, said ethylene copolymers having

[A] density of 0.85-0.92 g/cm3,

[B] an intrinsic viscosity [r|] as measured in decalin at 135° C. of 0.1-10 dVg,

[C] a ratio (Mw/Mn) of a weight average molecular weight (Mw) to a number average molecular weight (Mn) as measured by GPC of 1.2-4, and

[D] a ratio (MFR10/MFR2) of MFR10 under a load of 10 kg to MFR2 under a load of 2.16 kg at 190° C. of 8-50, and being narrow in molecular weight distribution and excellent in flowability.

11 Claims, 4 Drawing Sheets