# US 11,299,564 B2 · Dialkyl peroxide composition for modifying the rheology of polypropylene in molten state

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- Number: US 11,299,564 B2
- Document ID: US11299564B2
- Status: Granted
- Kind: B2
- Application number: 16/467,522
- Filed: 2017-12-15
- Published: 2019-11-28
- Granted: 2022-04-12
- Earliest claimed: 2016-12-15
- Assignees: Arkema France
- Applicants: Arkema France
- Inventors: Philippe Maj; Martin Möllers; Isabelle Tartarin
- Web page: https://patentgrep.com/patent/US11299564B2

## CPC

- C08F 10/06: Propene
- C08F 8/50: Partial depolymerisation
- C08J 3/226: {using a polymer as a carrier}
- C08L 91/00: Compositions of oils, fats or waxes; Compositions of derivatives thereof
- C08F 2810/10: including a reactive processing step which leads, inter alia, to morphological and/or rheological modifications, e.g. visbreaking
- C08J 2323/10: Homopolymers or copolymers of propene
- C08J 2491/00: Characterised by the use of oils, fats or waxes; Derivatives thereof
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## 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.

## Claims

### Claim 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.

### Claim 2 (depends on 1)

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.

### Claim 3 (depends on 1)

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

### Claim 4 (depends on 1)

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.

### Claim 5 (depends on 1)

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.

### Claim 6 (depends on 1)

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

### Claim 7 (depends on 1)

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

### Claim 8 (depends on 1)

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.

### Claim 9 (depends on 8)

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

### Claim 10 (depends on 8)

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

### Claim 11 (depends on 8)

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.

### Claim 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.