Polypropylene composition

Patent metadata

Field	Value
Publication number	US-11091617-B2
Application number	US-201716345633-A
Country	US
Kind code	B2
Filing date	Nov 7, 2017
Priority date	Nov 9, 2016
Publication date	Aug 17, 2021
Grant date	Aug 17, 2021

Abstract

The present invention relates to a polymer composition, to a use of the polymer composition for producing an article, to an article comprising the polymer composition, preferably to an article which comprises a layer element comprising at least one layer which comprises the polymer composition.

First claim

The invention claimed is:

1. A polypropylene composition comprising:
(i) more than 25 wt % of a polymer of propylene (PP) being a heterophasic copolymer of propylene (iPP), which comprises a heterophasic copolymer of propylene (A), which comprises:
a polypropylene matrix component (a1) and
an elastomeric propylene copolymer component (a2) that is dispersed in said polypropylene matrix (a1), and
wherein the heterophasic copolymer of propylene (A) has a Melting temperature (Tm) (DSC) of at least 145° C., and a Vicat softening temperature (Vicat A) of at least 90° C. (according to ASTM D 1525, method A, 50° C./h, 10N), and
(ii) 0.2 to 5 wt % of additives;
based on the total amount (100 wt %) of the polypropylene composition;
wherein the additives (ii) are selected from (iia) one or more UV stabiliser(s) comprising a hindered amine compound and (iib) one or more antioxidants comprising a dialkyl amine compound and optionally additives other than UV stabiliser(s) (iia) and antioxidant(s) (iib), and wherein the additives (ii) are without phenolic unit(s).

2. The polypropylene composition according to claim 1 , wherein the hindered amine compound of the UV stabiliser(s) (iia) is selected from a compound containing one or more 2,2,6,6-substituted piperidine moiety or a compound containing one or more 2,2-substituted piperazine moiety.

3. The polypropylene composition according to claim 1 , wherein the hindered amine compound of the UV stabiliser(s) (iia) bears more than two piperidine moieties which bear substituents at least at 2,2,6,6-position.

4. The polypropylene composition according to claim 1 , wherein the hindered amine compound of the UV stabiliser(s) (iia) has a Molecular weight, M n , of 2000 g/mol or more.

5. The polypropylene composition according to claim 1 , wherein the hindered amine compound of the UV stabiliser(s) (iia) is present in an amount of 0.1 to 1.0 wt %, based on the amount (100 wt %) of the polymer composition.

6. The polypropylene composition according to claim 1 , wherein the antioxidant(s) (iib) is a di((C8-C30))alkyl amine compound.

7. The polypropylene composition according to claim 1 , wherein the antioxidant(s) (iib) is present in an amount of 20 to 3000 ppm, based on the amount (100 wt %) of the polymer composition.

8. The polypropylene composition according to claim 1 , wherein heterophasic copolymer of propylene (A) has one or more, in any order, of the following further properties:
MFR 2 of 0.2 to 20 g/10 min when measured according to ISO 1133 (at 230° C. and 2.16 kg load),
Xylene cold soluble (XCS) fraction in amount of 3 to 40 wt %,
Comonomer content of 0.5 to 20% wt %, wherein the comonomer(s) is selected from ethylene and/or C4-C8 alpha olefin comonomers,
Tensile modulus of at least 700 MPa, and/or
Density of 900 to 910 kg/m 3 .

9. An article comprising the polymer composition according to claim 1 .

10. The article according to claim 9 , comprising a layer element, wherein said layer element comprises at least one layer comprising the polymer composition.

11. The article according to claim 9 , which comprises a layer element comprising at least one layer which comprises the polymer composition wherein the layer element is selected from:
a monolayer element comprising the polypropylene composition, or
a multilayer element wherein at least one layer comprises the polypropylene composition.

12. The article according to claim 9 , which is a film selected from:
a monolayer film comprising the polypropylene composition, or
a multilayer film wherein at least one layer comprises the polypropylene composition.

13. The article according to claim 9 , which is a multilayer assembly comprising two or more layer elements, wherein at least one layer element is a layer element comprising at least one layer which comprises the polymer composition, wherein the at least one layer element is selected from:
a monolayer element comprising the polypropylene composition, or
a multilayer element wherein at least one layer comprises the polymer composition.

Assignees

• Borealis Ag

Inventors

• Bernreitner Klaus
• Sandholzer Martina
• Hellstrom Stefan
• Broeders Bert

Classifications

• C08K5/32

  Compounds containing nitrogen bound to oxygen · CPC title

• B32B2307/3065

  Flame resistant or retardant, fire resistant or retardant · CPC title

• B32B5/16

  characterised by features of a layer formed of particles, e.g. chips, powder {or granules (layer formed of natural mineral particles B32B19/00; layer being formed of wood fibres, chips or particles B32B21/02)} · CPC title

• B32B2605/00

  Vehicles · CPC title

• C08K5/34926

  also containing heterocyclic groups other than triazine groups · CPC title