US 11,840,588 B2
Polyolefin resin and preparation method thereof
Hee Jun Lee, Sejong-si (KR); Byung Keel Sohn, Daejeon (KR); Da Jung Kim, Daejeon (KR); Sung Ho Choi, Sejong-si (KR); and Su Hyun Park, Daejeon (KR)
Assigned to DL Chemical CO., LTD., Seoul (KR)
Filed by DL Chemical CO., LTD., Seoul (KR)
Filed on Mar. 28, 2022, as Appl. No. 17/706,016.
Claims priority of application No. 10-2021-0040511 (KR), filed on Mar. 29, 2021.
Prior Publication US 2022/0315679 A1, Oct. 6, 2022
Int. Cl. C08F 210/16 (2006.01); C08F 4/6592 (2006.01); C08F 210/02 (2006.01)
CPC C08F 210/02 (2013.01) [C08F 4/6592 (2013.01); C08F 4/65927 (2013.01); C08F 210/16 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A polyolefin resin satisfying the following requirements (i) to (vii):
(i) a density (D) measured by a density gradient pipe method according to ASTM D1505 ranges from 0.900 to 0.936 g/cm3;
(ii) a melt flow index (MIE) measured according to ASTM D1238 (190° C., 2.16 kg) ranges from 0.1 to 2.0 g/10 minutes;
(iii) a high load melt flow index (MIF) measured according to ASTM D1238 (190° C., 21.6 kg) ranges from 17 to 100 g/10 minutes;
(iv) a melt flow rate ratio (SR, MIF/MIE) ranges from 35 to 55;
(v) a ratio (Mw/Mn) of a weight average molecular weight (Mw) to a number average molecular weight (Mn) measured by gel permeation chromatography ranges from 3.0 to 5.0;
(vi) a ratio (Mz/Mw) of a Z-average molecular weight (Mz) to a weight average molecular weight (Mw) measured by gel permeation chromatography ranges from 2.0 to 3.5; and
(vii) a tear strength (MD, g) in a machine direction of a film produced by blowing the polyolefin resin to a thickness of 30 μm at an expansion ratio (BUR) of 2.5 satisfies Relational Expression 1 below.

OG Complex Work Unit Math