Method for manufacturing a polypropylene composition with controlled fluidity

Patent metadata

Field	Value
Publication number	US-9932467-B2
Application number	US-201415108820-A
Country	US
Kind code	B2
Filing date	Dec 22, 2014
Priority date	Dec 30, 2013
Publication date	Apr 3, 2018
Grant date	Apr 3, 2018

Abstract

The method for manufacturing a composition consists in bringing into contact a product containing mostly polypropylene having a controlled fluidity less than 10 g/10 min with highly fluid polypropylene and a polymer grafted with maleic anhydride.

First claim

The invention claimed is:

1. Method for manufacturing a composition, comprising bringing into contact the following three components:
a product containing mostly polypropylene having a controlled fluidity according to standard ISO 1133 (230° C., 2.16 kg) less than 10 g/10 min, present in an amount from 82% to 88% inclusive, by total weight of the composition,
polypropylene having a controlled fluidity according to standard ISO 1133 (230° C., 2.16 kg) greater than 400 g/10 min, present in an amount from 7% to 13% inclusive, by total weight of the composition, and
a polymer grafted with maleic anhydride, present in an amount from 2% to 8% inclusive, by total weight of the composition.

2. Method according to claim 1 , said method further comprising two steps, performed in this order:
bringing into contact the product containing mostly polypropylene and the polypropylene having a controlled fluidity according to standard ISO 1133 (230° C., 2.16 kg) greater than 400 g/10 min, and
adding the polymer grafted with maleic anhydride.

3. Method according to claim 1 , wherein the product containing mostly polypropylene and the polypropylene having a controlled fluidity according to standard ISO 1133 (230° C., 2.16 kg) greater than 400 g/10 min are brought into contact so as to obtain a first mixture and the polymer grafted with maleic anhydride is added in a second stage to this first mixture.

4. Method according to claim 1 , wherein the polymer grafted with maleic anhydride is Styrene Ethylene Butadiene Styrene (SEBS).

5. Method according to claim 1 , wherein the components are brought into contact in an extruder.

6. Method according to claim 1 , wherein the components are brought into contact in a plasticating screw.

7. Method according to claim 1 , wherein the product containing mostly polypropylene contains between 5% and 10% inclusive of polyethylene, by total weight of said product.

8. Method according to claim 1 , wherein the product containing mostly polypropylene is obtained at least partly from recycling.

Assignees

• Plastic Omnium Cie

Inventors

• Viot Frederic

Classifications

• B29C47/0009

  Operations & Transport · mapped topic

• C08J2323/12

  Polypropene · CPC title

• C08J3/12

  Powdering or granulating · CPC title

• B29K2023/14

  Copolymers of polypropylene (B29K2023/16 takes precedence) · CPC title

• C08J3/005

  Processes for mixing polymers · CPC title