Propylene copolymer composition

Patent metadata

Field	Value
Publication number	US-2018298179-A1
Application number	US-201615576757-A
Country	US
Kind code	A1
Filing date	May 13, 2016
Priority date	May 29, 2015
Publication date	Oct 18, 2018
Grant date	—

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

1 . A propylene copolymer composition selected from:
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 5.5 to 9 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 %; or a polypropylene composition (b) comprising a multimodal polypropylene (b) comprising (A) a random copolymer of propylene, (B) a random copolymer of propylene; wherein the random copolymer of propylene (A) has a lower MFR 2 and higher comonomer content than the random copolymer of propylene (B); (C) β-nucleating agent; and (E) optional further additives other than the β-nucleating agent (C); wherein the propylene copolymer composition has an MFR2 of 0.15 to 0.30 g/10 min and a comonomer content of 2.8 to 9.9 mol %; and wherein the propylene copolymer composition is at least partially crystallized in the β-modification by said β-nucleating agent and has B >0,6, wherein the B is defined as described in the specification under Determination methods.

2 . The propylene copolymer composition according to claim 1 , wherein the propylene copolymer composition is selected from:
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 to 65 wt % of the random copolymer of propylene (A). 35 to 55 wt % preferably 35 to 50 of the heterophasic copolymer of propylene (B); or a polypropylene composition (b) comprising a multimodal polypropylene (b) which comprises, based on the combined amount of the component (A) and the component (B), 45 to 65 wt % of the random copolymer of propylene (A). 35 to 55 wt % of the heterophasic copolymer of propylene (B).

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

4 . The propylene copolymer composition according to any of the preceding claims, wherein:
the propylene copolymer composition has B of at least 0.6 when defined as described in the specification under “Determination methods”.

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 one or more, in any order of the following properties:
an MFR 2 (ISO 1133, 2.16 kg load, 230° C.) of 0.02 to 0.1 g/10 min, and/or the comonomer content of 5.8 to 7.3 mol %.

7 . The propylene copolymer composition according to claim 1 , wherein heterophasic 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.

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 %, an 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 10 , 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

• C08L2203/18

  used for pipes · CPC title

• C08L23/14 Primary

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

• C08L2205/242

  Beta spherulite nucleating agents · CPC title

• C08F2500/05

  Bimodal or multimodal molecular weight distribution · CPC title

• C08L2205/025

  containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure · CPC title