Polyethylene with controlled wax content, chlorinated polyethylene thereof and molded article produced from the chlorinated polyethylene

Patent metadata

Field	Value
Publication number	US-2016229931-A1
Application number	US-201414383050-A
Country	US
Kind code	A1
Filing date	Apr 17, 2014
Priority date	Apr 19, 2013
Publication date	Aug 11, 2016
Grant date	—

Abstract

Disclosed are polyethylene, chlorinated polyethylene thereof and a molded article produced from the chlorinated polyethylene. More specifically, disclosed are polyethylene for preparation of chlorinated polyethylene, the polyethylene having a molecular weight distribution (MWD) of 5 or less, a melting index (5.0 kg) of 0.1 to 10 dg/min, a weight average molecular weight of 50,000 to 300,000 g/mol, a melting temperature of 125 to 135° C., a wax content of 0.0001 to 3% by weight or 0.01 to 0.3% by weight and a density of 0.94 g/cm 3 or more, chlorinated polyethylene thereof and a molded article produced from the chlorinated polyethylene.

First claim

1 . Polyethylene for preparation of chlorinated polyethylene, the polyethylene having a molecular weight distribution (MWD) of 5 or less, a melting index (5.0 kg) of 0.1 to 10 dg/min, a weight average molecular weight of 50,000 to 300,000 g/mol, a melting temperature of 125 to 140° C., a density of 0.94 g/cm 3 or more and a wax content of 0.01 to 0.3% by weight.

2 . The polyethylene according to claim 1 , wherein the polyethylene has a low molecular weight (≦5,000 g/mol) content of 0.01 to 5% by weight.

3 . The polyethylene according to claim 1 , wherein the molecular weight distribution (MWD) is 2.1 to 3.4.

4 . The polyethylene according to claim 1 , wherein the melting index (5.0 kg) is 0.3 to 7 dg/min.

5 . The polyethylene according to claim 1 , wherein the melting temperature is 125 to 135° C.

6 . The polyethylene according to claim 1 , wherein the density is 0.945 to 0.955 g/cm 3 .

7 . The polyethylene according to claim 1 , wherein the polyethylene has a wax content of 0.05 to 0.2% by weight.

8 . The polyethylene according to claim 1 , wherein the polyethylene has an average particle size of 30 to 400 μm.

9 . The polyethylene according to claim 1 , wherein the polyethylene is prepared in the presence of a metallocene catalyst.

10 . Chlorinated polyethylene prepared by reacting the polyethylene according to claim 1 with chlorine.

11 . The chlorinated polyethylene according to claim 10 , wherein the chlorinated polyethylene has a chlorine content of 20 to 45% by weight.

12 . The chlorinated polyethylene according to claim 10 , wherein the chlorinated polyethylene has a Mooney viscosity of 70 to 110.

13 . The chlorinated polyethylene according to claim 10 , wherein the chlorinated polyethylene has a volume resistance of 10 13 to 10 17 ∩cm and thermal stability of 150 to 180° C.

14 . An extrusion-molded article produced from the chlorinated polyethylene according to claim 10 .

15 . The extrusion-molded article according to claim 14 , wherein the extrusion-molded article is cross-linked using a peroxide cross-linking agent.

16 . The extrusion-molded article according to claim 15 , wherein the extrusion-molded article has a volume resistance of 1×10 14 Ωcm to 200×10 14 Ωcm.

17 . The extrusion-molded article according to claim 14 , wherein the extrusion-molded article is a wire cable or a hose.

18 . A method for preparing chlorinated polyethylene comprising:
dispersing 100 parts by weight of the polyethylene according to claims 1 , 0.1 to 0.2 parts by weight of an emulsifier, and 1 to 5 parts by weight of a dispersant in water; and reacting the resulting dispersion with 80 to 200 parts by weight of chlorine in the presence of 0.01 to 1.0 parts by weight of a catalyst.

19 . A method for producing an extrusion-molded article comprising:
a) roll-mill compounding the chlorinated polyethylene according to claim 10 with a cross-linking agent; b) extruding the compounded chlorinated polyethylene; c) allowing the extrudate to stand at 100 to 180° C. for 3 to 60 minutes; and d) cross-linking (curing) the extrudate.

Assignees

• Lg Chemical Ltd

Inventors

• Yoo Soung Hun
• Bae Geun Yeol
• Do Sang Rok

Classifications

• C08K5/14

  Peroxides · CPC title

• C08J7/08

  Heat treatment · CPC title

• C08J3/247

  Heating methods · CPC title

• C08J5/18

  Manufacture of films or sheets · CPC title

• H01B3/441

  from alkenes · CPC title