Propylene-based copolymer composition for pipes

Patent metadata

Field	Value
Publication number	US-9914826-B2
Application number	US-201515328845-A
Country	US
Kind code	B2
Filing date	Jun 29, 2015
Priority date	Jul 25, 2014
Publication date	Mar 13, 2018
Grant date	Mar 13, 2018

Abstract

A polyolefin composition made from or containing (A) from 90.0 to 99.0 wt % of a first propylene ethylene copolymer wherein (i) the ethylene derived units is between 1.0 and 8.0 wt %; (ii) the melting temperature ranges from 135 to 155° C.; (iii) the melt flow rate (230° C./5 kg ISO 1133) ranges from 0.2 to 3.5 g/10 min; (iv) the xylene solubles at 25° C. ranges from 10.0 to 4.0 wt %; (v) the polydispersity index ranges from 3.0 to 7.0; and (B) from 1.0 to 10.0 wt % of a second propylene ethylene copolymer (i) containing from 8.0 to 20.0 wt % of ethylene derived units; and having a MFR (measured at 190° C. 2.16 kg of load) between 0.5 and 5.0 g/10 min, wherein (a) the resulting polyolefin composition has a melt flow rate (230° C./5 kg ISO 1133) ranging from 0.2 to 4.0 g/10 min and (b) the sum A+B being 100.

First claim

What is claimed is:

1. A polyolefin composition comprising:
A) from about 90.0 wt % to about 99.0 wt %, based upon the total weight of the polyolefin composition, of a first propylene ethylene copolymer wherein:
i) the content of ethylene derived units is between about 1.0 wt % and 8.0 about wt %, based upon the total weight of the first copolymer;
(ii) the melting temperature ranges from about 135° C. to about 155° C.;
(iii) the melt flow rate (230° C./5 kg ISO 1133) ranges from about 0.2 g/10 min to about 3.5 g/10 min;
(iv) the xylene solubles at 25° C. ranges from about 10.0 wt % to about 4.0 wt %, based upon the total weight of the first copolymer; and;
(v) the polydispersity index, PI, ranges from about 3.0 to about 7.0; and

B) from about 1.0 wt % to about 10.0 wt %, based upon the total weight of the polyolefin composition, of a second propylene ethylene copolymer:
(i) containing from 8.0 wt % to 20.0 wt % of ethylene derived units, based upon the total weight of the second copolymer; and
(ii) having a MFR (measured at 190° C. 2.16 kg of load) comprised between 0.5 g/10 min and 5.0 g/10 min;

wherein
(a) the resulting polyolefin composition has an melt flow rate (230° C./5 kg ISO 1133) ranging from about 0.2 g/10 min to about 4.0 g/10 min and
(b) the sum A+B being 100.

2. The polyolefin composition of claim 1 wherein the content of ethylene derived units in component A) ranges from about 2.0 wt % to about 6.0 wt %.

3. The polyolefin composition of claim 1 wherein the content of ethylene derived units in component B) ranges from about 11 wt % to about 19 wt %.

4. The polyolefin composition of claim 1 wherein the melt flow rate (MFR) (230° C./5 kg ISO 1133) ranges from about 0.4 to about 3.0 g/10 min.

5. An article of manufacture comprising:
a polyolefin composition comprising:
A) from about 90.0 wt % to about 99.0 wt %, based upon the total weight of the polyolefin composition, of a first propylene ethylene copolymer wherein:
i) the content of ethylene derived units is between about 1.0 wt % and 8.0 about wt %, based upon the total weight of the first copolymer;
(ii) the melting temperature ranges from about 135° C. to about 155° C.;
(iii) the melt flow rate (230° C./5 kg ISO 1133) ranges from about 0.2 g/10 min to about 3.5 g/10 min;
(iv) the xylene solubles at 25° C. ranges from about 10.0 wt % to about 4.0 wt %, based upon the total weight of the first copolymer; and
(v) the polydispersity index, PI, ranges from about 3.0 to about 7.0; and

B) from about 1.0 wt % to about 10.0 wt %, based upon the total weight of the polyolefin composition, of a second propylene ethylene copolymer:
(i) containing from 8.0 wt % to 20.0 wt % of ethylene derived units, based upon the total weight of the second copolymer; and
(ii) having a MFR (measured at 190° C. 2.16 kg of load) between about 0.5 g/10 min and about 5.0 g/10 min;

wherein
(a) the resulting polyolefin composition has a melt flow rate (230° C./5 kg ISO 1133) ranging from about 0.2 g/10 min to about 4.0 g/10 min and
(b) the sum A+B being 100.

6. The article of manufacture of claim 5 , wherein the article is selected from the group consisting of pipes and sheets.

7. The article of manufacture of claim 5 , wherein the article is a multilayer article wherein at least one layer comprises the polyolefin composition.

8. The article of manufacture of claim 6 is a pipe.

Assignees

• Basell Poliolefine Italia Srl

Inventors

• Galvan Monica
• Neumann Andreas
• Bolognesi Sandro
• Tisi Francesca
• Pellegatti Giampaolo

Classifications

• B32B1/08

  Tubular products · 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

• B32B27/20

  using fillers, pigments, thixotroping agents · CPC title

• F16L9/12

  of plastics with or without reinforcement (F16L9/16 - F16L9/22 take precedence) · CPC title

• B32B2264/10

  Inorganic particles · CPC title