Low density polyethylene for extrusion coating

Patent metadata

Field	Value
Publication number	US-2015111053-A1
Application number	US-201214403972-A
Country	US
Kind code	A1
Filing date	Dec 7, 2012
Priority date	May 31, 2012
Publication date	Apr 23, 2015
Grant date	—

Abstract

The present invention relates to a low density polyethylene having a molecular weight distribution Mw/Mn which is 15 or less, a storage modulus G′, measured at a loss modulus G″ of 5 kPa, which is above 3000 Pa, a weight average molecular weight (Mw) which is between 192000 and 250000 g/mol and has a melt flow rate (MFR) according to ISO 1133 (190° C., 2.16 kg) which is higher than 3.0 g/10 min, compositions, a process for production of the low density polyethylene, a low density polyethylene which is obtainable by the process, a continuous ethylene polymerization method for introducing vinylidene in a low density polyethylene, a method for an extrusion coating process or a method for an extrusion lamination process, an article, e.g. an extrusion article, an extrusion lamination article, film blowing article, film casting article, wire and cable extrusion article, injection moulding article, blow moulding article or pipe extrusion article, and uses of the low density polyethylene.

First claim

1 - 12 . (canceled)

13 . A low density polyethylene having a molecular weight distribution Mw/Mn which is 15 or less, a storage modulus G′, measured at a loss modulus G″ of 5 kPa, which is above 3000 Pa, a weight average molecular weight (Mw) which is between 192000 and 250000 g/mol, and has a melt flow rate (MFR) according to ISO 1133 (190° C., 2.16 kg) which is higher than 3.0 g/10 min.

14 . A low density polyethylene according to claim 13 , wherein the low density polyethylene is produced in a tubular reactor.

15 . A low density polyethylene according to claim 13 , wherein the low density polyethylene has a vinylidene content which is at least 15/100k C.

16 . A composition comprising the low density polyethylene according to claim 13 , wherein the composition, optionally, may be useful in extrusion coating and/or extrusion lamination processes.

17 . A composition according to claim 16 , which may comprise the low density polyethylene in an amount of 5 to 40 wt %, based on the total weight of the composition, and may further comprise at least one olefin polymer prepared in the presence of a transition metal catalyst, which at least one olefin polymer may be selected from homo- or copolymers of polyethylene, polypropylene or poly-1-butene.

18 . A process for production of the low density polyethylene according to claim 13 , in a tubular reactor by radical initiated polymerization under high pressure where the polymerization is performed by reacting a reaction mixture, comprising ethylene monomers, under the action of one or more radical initiators, such as peroxides, oxygen or combinations thereof, characterized by that the inlet temperature of the reaction mixture into the first reaction zone of the reactor is from 125 to 132° C.

19 . A continuous ethylene polymerization method for introducing a vinylidene in a low density polyethylene, characterized by that vinylidene is introduced by selecting an inlet temperature of the reaction mixture into the first reaction zone of the reactor which is from 125 to 132° C.

20 . A process according to claim 18 , wherein a radical initiator cocktail is used, which is composed of the following radical initiators, where the 0.1 hours half life temperature (T½) is given for each radical initiator: Initiator A (T½ 0.1 h at 75-90° C. in chlorobenzene), Initiator B (T½ 0.1 h at 80-95° C. in chlorobenzene), Initiator C (T½ 0.1 h at 105-125° C. in chlorobenzene), Initiator D (T½ 0.1 h at 125-140° C. in chlorobenzene) Initiator E (T½ 0.1 h at 130-145° C. in chlorobenzene) and Initator F (T½ 0.1 h at 155-175° C. in chlorobenzene).

21 . A continuous ethylene polymerization method according to claim 19 , wherein a radical initiator cocktail is used, which is composed of the following radical initiators, where the 0.1 hours half life temperature (T½) is given for each radical initiator: Initiator A (T½ 0.1 h at 75-90° C. in chlorobenzene), Initiator B (T½ 0.1 h at 80-95° C. in chlorobenzene), Initiator C (T½ 0.1 h at 105-125° C. in chlorobenzene), Initiator D (T½ 0.1 h at 125-140° C. in chlorobenzene) Initiator E (T½ 0.1 h at 130-145° C. in chlorobenzene) and Initator F (T½ 0.1 h at 155-175° C. in chlorobenzene).

22 . A low density polyethylene which is obtainable by the process according to claim 18 .

23 . A low density polyethylene which is obtainable by the process according to claim 20 .

24 . A method for an extrusion coating process, which method comprises extrusion coating a flat substrate by extruding the low density polyethylene according to claim 13 .

25 . A method for an extrusion coating process, which method comprises extrusion coating a flat substrate by extruding the composition according to claim 16 , in a molten state through a flat die onto said substrate.

26 . A method for an extrusion lamination process utilizing the low density polyethylene according to claim 13 .

27 . A method for an extrusion lamination process utilizing the composition according to claim 16 .

28 . An article selected from an extrusion article, an extrusion coating article or an extrusion lamination article, film blowing article, film casting article, wire and cable extrusion article, injection molding article, blow molding article or pipe extrusion article, comprising the low density polyethylene according to claim 13 .

29 . An article selected from an extrusion article, an extrusion coating article or an extrusion lamination article, film blowing article, film casting article, wire and cable extrusion article, injection molding article, blow molding article or pipe extrusion article, comprising the composition according to claim 16 .

Assignees

• Borealis Ag

Inventors

• Nummila-Pakarinen Auli
• Sultan Bernt-Ake
• Voigt Bjorn
• Ruess Gabriel
• Anker Martin
• Bergqvist Mattias
• Gkourmpis Thomas
• Hjertberg Thomas

Classifications

• C09D123/06

  Polyethylene · CPC title

• C08F110/02 Primary

  Ethene · CPC title

• B05D1/40

  Distributing applied liquids or other fluent materials by members moving relatively to surface · CPC title

• B05D2507/015

  modified · CPC title

• B32B27/32

  comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)} · CPC title