Propylene copolymer composition

Patent metadata

Field	Value
Publication number	US-10526478-B2
Application number	US-201615576757-A
Country	US
Kind code	B2
Filing date	May 13, 2016
Priority date	May 29, 2015
Publication date	Jan 7, 2020
Grant date	Jan 7, 2020

Abstract

A propylene copolymer composition which comprises —a random copolymer of propylene (A), —a random copolymer of propylene (B), and —optional additive(s), suitable for pressure pipe applications.

First claim

The invention claimed is:

1. A propylene copolymer composition comprising: a polypropylene composition (a) comprising a multimodal polypropylene (a) comprising:
(A) a random copolymer of propylene having:
an MFR 2 of 0.01 to 0.5 g/10 min (ISO 1133, 2.16 kg load, 230° C.),
one or more comonomer(s) selected from ethylene or C4-C10 alpha olefins and having a comonomer content of 5.8 to 7.3 mol %;

(B) a random copolymer of propylene having:
an MFR 2 of 0.1 to 15 g/10 min (ISO 1133, 2.16 kg load, 230° C.),
one or more comonomer selected from ethylene or C4-C10 alpha olefins;
wherein the random copolymer of propylene (A) has a lower MFR 2 and higher comonomer content than the random copolymer of propylene (B);

(C) optional β-nucleating agent; and
(E) optional further additives other than the optional β-nucleating agent (C);
wherein the propylene copolymer composition has an MFR 2 of 0.15 to 0.30 g/10 min and a comonomer content of 2.8 to 9.9 mol %.

2. The propylene copolymer composition according to claim 1 , wherein the propylene copolymer composition comprises a polypropylene composition (a) comprising a multimodal polypropylene (a) which comprises, based on the combined amount of the component (A) and the component (B),
45 65 wt % of the random copolymer of propylene (A); and
35 to 55 wt % of the random copolymer of propylene (B).

3. The propylene copolymer composition according to claim 1 , wherein the propylene copolymer composition comprises a polypropylene composition (a) which comprises (C) β-nucleating agent.

4. The propylene copolymer composition according to claim 1 , wherein:
the propylene copolymer composition has an amount of β-modification (B) of at least 0.6 when defined by the following formula:

B
=

I
β

⁡

(
300
)

I
α

⁡

(
110
)

+

I
α

⁡

(
040
)

+

I
α

⁡

(
130
)

+

I
β

⁡

(
300
)

wherein I β (300) is the intensity of β(300) peak, I α (110) is the intensity of α(110) peak, I α (040) is the intensity of α(040) peak and I α (130) is the intensity of α(130) peak obtained after subtracting the amorphous halo.

5. The propylene copolymer composition according to claim 1 , wherein the amount of β-nucleating agent product (C) is of from 0.0001 to 2.0 wt %, based on the amount of the propylene copolymer composition the ß-nucleating agents (C) selected from N,N′-dicyclohexyl-2,6-naphthalene dicarboxamide, 5,12-dihydro-quino(2,3-b)acridine-7,14-dione, quino(2,3-b)acridine-6,7,13,14(5H,12H)-tetrone, salts of dicarboxylic acids with at least 7 carbon atoms with metals of group II of the periodic table, and mixtures thereof.

6. The propylene copolymer composition according to claim 1 , wherein the random copolymer of propylene (A) has
an MFR 2 (ISO 1133, 2.16 kg load, 230° C.) of 0.02 to 0.1 g/10 min.

7. The propylene copolymer composition according to claim 1 , wherein the random copolymer of propylene (B) has one or more, in any order of the following properties:
an MFR 2 (ISO 1133, 2.16 kg load, 230° C.) of 0.3 to 10 g/10 min, and/or
the comonomer content of 1.5 to 11 mol %.

8. The propylene copolymer composition according to claim 1 , having one or more of the following properties:
comonomer content of 3.4 to 8.3 mol %, and/or
a Notched Charpy impact of >1 kJ/m 2 when measured at 0° C. according to ISO 179.

9. The propylene copolymer composition according to claim 1 , wherein the comonomer of random copolymer of propylene (A) and the comonomer of random copolymer of propylene (B) is ethylene.

10. An article comprising the propylene composition according to claim 1 .

11. The article according to claim 10 which is a pipe or pipe fitting.

12. The article according to claim 11 , wherein the pipe is for pressure pipe applications.

Assignees

• Borealis Ag

Inventors

• Braun Hermann
• Boragno Luca
• Bernreitner Klaus
• Martin Sanna
• Suikkanen Tiina
• Stadlbauer Wolfram

Classifications

• C08L23/14 Primary

  Copolymers of propene (C08L23/16 takes precedence) · CPC title

• C08L23/145

  with monomers having two or more carbon-to-carbon double bonds · CPC title

• C08L2205/242

  Beta spherulite nucleating agents · CPC title

• C08L2203/18

  used for pipes · CPC title

• C08F210/06

  Propene · CPC title