Thermoplastic composition made of polyphenylene sulphide and polyamide-grafted polyolefin

Patent metadata

Field	Value
Publication number	US-10829637-B2
Application number	US-201515532616-A
Country	US
Kind code	B2
Filing date	Nov 24, 2015
Priority date	Dec 3, 2014
Publication date	Nov 10, 2020
Grant date	Nov 10, 2020

Abstract

The present invention relates to a composition that comprises a mixture of polymers, which comprises: a first polymer comprising polyphenylene sulphide, making up 55 wt % to 95 wt % of the mixture; a thermoplastic modifier, making up 5 wt % to 45 wt % of the mixture; optionally one or more functional additives, making up at most 10 wt % of the mixture, preferably at most 5 wt % of the mixture, characterised in that the thermoplastic modifier includes a second polymer which comprises a polyolefin backbone containing a group of at least one unsaturated monomer (X) and a plurality of polyamide grafts. The invention also relates to a multilayer structure including a plurality of adjacent layers, at least one of which consists of the aforementioned composition.

First claim

The invention claimed is:

1. A thermoplastic composition consisting of a mixture of polymers, consisting of:
a first polymer consisting of polyphenylene sulfide, present between 55% and 95% by weight of the mixture;
a thermoplastic modifier, present between 5% and 45% by weight of the mixture; and
optionally one or more functional adjuvants, present at most at 10% by weight of the mixture,

wherein the thermoplastic modifier comprises a second polymer consisting of a polyolefin backbone containing at least one unsaturated monomer (X) and a plurality of polyamide grafts, wherein the polyamide grafts are attached to the polyolefin backbone by the residue of the unsaturated monomer (X) comprising a function that can react by a condensation reaction with a polyamide having at least one amine end and/or at least one carboxylic acid end, the residue of the unsaturated monomer (X) is bound to the backbone by grafting or copolymerization.

2. The composition of claim 1 , wherein the thermoplastic modifier further comprises a third polymer consisting of one or more polyolefins.

3. The composition of claim 2 , wherein the second and third polymers are each present in the thermoplastic modifier between 5% and 95% by weight of said thermoplastic modifier, and wherein the sum of the second and third polymers constitutes 100% of the thermoplastic modifier.

4. The composition of claim 2 , wherein the thermoplastic modifier consists of the second and third polymers.

5. The composition of claim 1 , wherein the thermoplastic modifier represents from between 10% and 30% by weight of the mixture.

6. The composition of claim 1 , wherein the grafted polymers nanostructured.

7. The composition of claim 1 , wherein the average molar weight of the polyamide grafts of the grafted polymer is in the range from 1000 to 10,000 g/mol.

8. The composition of claim 1 , wherein the polyamide grafts comprise at least one copolyamide.

9. The composition of claim 1 , wherein the functional adjuvant consists of one or more plasticizers, adhesion promoters, UV stabilizers and/or UV absorbers, antioxidants, flame retardants, colorants/optical brighteners, pigments and strengthening fillers.

10. A multilayer structure including a plurality of adjacent layers, wherein at least one of the plurality of adjacent layers consists of the composition of claim 1 .

11. The composition of claim 8 , wherein the at least one copolyamide is 6/12 mono NH 2 , and/or a monofunctional NH 2 polyamide 6 and/or a monofunctional NH 2 polyamide 11.

12. The multilayer structure of claim 10 in the form of a coating for a cable or a tube.

Assignees

• Arkema France

Inventors

• Ariura Fumi
• Sabard Mathieu
• Jousset Dominique

Classifications

• C08G81/028

  containing polyamide sequences · CPC title

• C08G69/48

  Polymers modified by chemical after-treatment · CPC title

• C08G75/02 Primary

  Polythioethers · CPC title

• B32B2405/00

  Adhesive articles, e.g. adhesive tapes · CPC title

• B32B27/06

  as the main or only constituent of a layer, {which is} next to another layer of {the same or of} a {different material (next to a layer of a particular substance B32B9/045; next to a bituminous or tarry layer B32B11/046; next to a water setting substance layer B32B13/12; next to a metal layer B32B15/08; next to a glass layer B32B17/10; next to a layer formed of natural mineral fibres or particles B32B19/045; next to a wood layer B32B21/08; next to a cellulosic plastic layer B32B23/08; next to a natural or synthetic rubber layer B32B25/08)} · CPC title