Polymerization process in the presence of an antistatic composition

Patent metadata

Field	Value
Publication number	US-9771439-B2
Application number	US-201414897597-A
Country	US
Kind code	B2
Filing date	Jun 10, 2014
Priority date	Jun 11, 2013
Publication date	Sep 26, 2017
Grant date	Sep 26, 2017

Abstract

A process for the preparation of polyolefins by polymerizing olefins at temperatures of from 20 to 200° C. and pressures of from 0.1 to 20 MPa in the presence of a polymerization catalyst and an antistatically acting composition in a polymerization reactor, wherein the antistatically acting composition is a mixture comprising an oil-soluble surfactant and water and the use of an antistatically acting composition comprising an oil-soluble surfactant and water as antistatic agent for the polymerization of olefins at temperatures of from 20 to 200° C. and pressures of from 0.1 to 20 MPa in the presence of a polymerization catalyst.

First claim

What is claimed is:

1. A polymerization process comprising polymerizing olefins at temperatures of 20-200° C. and pressures of 0.1-20 MPa in the presence of a polymerization catalyst and an antistatic composition in a polymerization reactor, wherein the antistatic composition is a mixture comprising an oil-soluble surfactant comprising a strong organic acid of a pK a of equal to or less than +4 and further comprising a hydrocarbyl group of from 6 to 40 carbon atoms, and water, wherein the polymerization is continuous and the antistatic composition is a mixture comprising an alcohol in an amount of 0.05-5 ppm per weight based on the weight of the prepared polyolefin.

2. The polymerization process of claim 1 , wherein the oil-soluble surfactant is a dodecylbenzenesulfonic acid.

3. The polymerization process of claim 1 , wherein the polymerization is carried out continuously and the amount of oil-soluble surfactant introduced into the polymerization reactor is 0.025 -50 ppm per weight referring to the weight of the prepared polyolefin and the amount of water introduced into the polymerization reactor is 0.005 -0.5 ppm per weight referring to the weight of the prepared polyolefin.

4. The polymerization process of claim 1 , wherein a mixture of the oil-soluble surfactant, the water, an alcohol and one or more aliphatic hydrocarbons is prepared and said mixture is then introduced into the polymerization reactor.

5. The polymerization process of claim 4 , wherein the alcohol is selected from the group consisting of methanol, ethanol and isopropanol.

6. The polymerization process of claim 1 , wherein the polymerization is carried out in gas-phase in a fluidized bed reactor.

7. The polymerization process of claim 1 , wherein the polymerization is carried out in suspension in a loop reactor or in a stirred tank reactor.

8. The polymerization process of claim 1 , wherein the polymerization catalyst is a Phillips catalyst, a single-site catalyst or a mixture of catalysts comprising at least one single-site catalyst.

9. The polymerization process of claim 1 , wherein the process comprises preparing a polyethylene having a MFR 21.6 at a temperature of 190° C. under a load of 21.6 kg of 0.5-300 g/10 min.

Assignees

• Basell Polyolefine Gmbh

Inventors

• Mihan Shahram
• Meier Gerhardus
• Schueller Ulf
• Schiendorfer Michael
• Wiesecke Jens

Classifications

• C08F10/02 Primary

  Ethene · CPC title

• C08F210/16

  Copolymers of ethene with alpha-alkenes, e.g. EP rubbers · CPC title

• C08F2/005

  by addition of a scale inhibitor to the polymerisation medium · CPC title

• C08F2/34 Primary

  Polymerisation in gaseous state · CPC title

• C08F110/02 Primary

  Ethene · CPC title