Dialkyl peroxide composition for modifying the rheology of polypropylene in molten state

Patent metadata

Field	Value
Publication number	US-11299564-B2
Application number	US-201716467522-A
Country	US
Kind code	B2
Filing date	Dec 15, 2017
Priority date	Dec 15, 2016
Publication date	Apr 12, 2022
Grant date	Apr 12, 2022

Abstract

The present invention relates to a liquid composition comprising at least one dialkyl peroxide, in liquid form at ambient temperature, at a content comprised within a range of from 75 to 77% by weight relative to the total weight of the composition, and at least one mineral oil with viscosity greater than 15 mPa·s, measured at a temperature of 10° C. and at a shear rate of 1000 s−1.Furthermore, the invention relates to the use of said composition to modify the melt rheology of the polypropylene.

First claim

The invention claimed is:

1. A liquid composition comprising at least one dialkyl peroxide, in liquid form at ambient temperature, with a content greater than 72% by weight and strictly less than 80% by weight, relative to the total weight of the composition, and at least one mineral oil with viscosity greater than 15 mPa·s, measured at a temperature of 10° C. and a shear rate of 1000 s −1 .

2. The composition according to claim 1 , wherein the dialkyl peroxide is selected from the group consisting of 2,5-dimethyl-2,5-di(tert-butylperoxy)-hexyne-3, ditert-butylperoxide, ditert-amyl peroxide, 2,5-dimethyl-2,5(di(tert-butylperoxy)hexane, and mixtures thereof.

3. The composition according to claim 1 , wherein the dialkyl peroxide comprises 2,5-dimethyl-2,5(di(tert-butylperoxy)hexane.

4. The composition according to claim 1 , wherein the content of the dialkyl peroxide is comprised within a range of from 73 to 79% by weight, relative to the total weight of the composition.

5. The composition according to claim 1 , wherein the mineral oil has a viscosity of from 15 to 1000 mPa·s, measured at a temperature of 10° C. and at a shear rate of 1000 s−1.

6. The composition as claimed in claim 1 , wherein the mineral oil is chosen among the paraffin oils.

7. The composition as claimed in claim 1 , wherein the composition shows a low or no effect when heated under confinement.

8. A method for modifying a melt rheology of a polypropylene comprising extruding the polypropylene at a temperature of between 140 and 300° C., for a few seconds to a maximum of a few minutes in the presence of the composition of claim 1 .

9. The method according to claim 8 , of visbreaking the polypropylene.

10. The method according to claim 8 , wherein the melt flow index of the polypropylene is increased.

11. The method according to claim 8 , wherein the polypropylene comprises a propylene homopolymer or propylene copolymer comprising at least one comonomer selected from the group consisting of ethylene, 1-butene, 1-hexene and 1-octene.

12. A method of decreasing the explosion intensity of a composition comprising at least one dialkyl peroxide in a content strictly greater than 70% by weight, relative to the total weight of the composition, comprising introducing at least one mineral oil with viscosity greater than 15 mPa·s, measured at a temperature of 10° C. and at a shear rate of 1000 s −1 .

Assignees

• Arkema France

Inventors

• Maj Philippe
• Möllers Martin
• Tartarin Isabelle

Classifications

• C08J2491/00

  Characterised by the use of oils, fats or waxes; Derivatives thereof · CPC title

• C08J3/226 Primary

  using a polymer as a carrier · CPC title

• C08J2323/10

  Homopolymers or copolymers of propene · CPC title

• C08F8/50

  Partial depolymerisation · CPC title

• C08L91/00

  Compositions of oils, fats or waxes; Compositions of derivatives thereof · CPC title