Compositions obtained from recycled polyolefins

Patent metadata

Field	Value
Publication number	US-12365789-B2
Application number	US-202117801310-A
Country	US
Kind code	B2
Filing date	Feb 4, 2021
Priority date	Feb 21, 2020
Publication date	Jul 22, 2025
Grant date	Jul 22, 2025

Abstract

A polypropylene composition made from or containing:
T1) 35-65 wt % of a recycled polypropylene mixture containing at least 80 wt % of rigid polypropylene items and having a purity of at least 90 wt %; T2) 20-50 wt % of an ethylene/propylene copolymer; T3) 5-20 wt % of a propylene/ethylene heterophasic copolymer composition made from or containing
a) from 12 wt % to 52 wt % of a propylene homopolymer or a propylene/ethylene copolymer; and b) from 48 wt % to 88 wt % of a propylene/ethylene copolymer having a content of ethylene derived units ranging from 15 wt % to 42 wt %;
wherein the propylene composition has a melt flow rate (ISO 1133 230° C./2.16 kg) ranging from 0.5 to 20 g/10 min.

First claim

What is claimed is:

1. A polypropylene composition comprising:
T1) 35-65 wt % of a recycled polypropylene mixture containing at least 80 wt % of rigid-polypropylene items and having a purity of at least 90 wt %, wherein the remaining 10 wt % comprises other polymers, paper, cardboard, carton, aluminized plastic, and textiles; wherein the recycled polypropylene mixture has a melt flow rate (ISO 1133 230° C./2.16 kg) ranging between 2 and 30 g/10 min and a melting point measured by DSC ranging from 148° C. to 162° C.;
T2) 20-50 wt % of an ethylene propylene copolymer having
i) a content of ethylene derived units between 1.0 wt % and 8.0 wt %;
(ii) a melting temperature ranging from 135° C. to 155° C.;
(iii) a melt flow rate (ISO 1133 230° C./5 kg. ISO 1133) ranging from 0.2 g/10 min to 3.5 g/10 min; and
(iv) xylene solubles at 25° C. ranging from 10.0 wt % to 4.0 wt %; and

T3) 5-20 wt % of a propylene/ethylene heterophasic copolymer composition having an intrinsic viscosity on a xylene soluble fraction measured at 25° C. ranging from 2.5 dl/g to 4.5 dl/g and comprising:
a) from 12 wt % to 52 wt % of a propylene homopolymer or a propylene/ethylene copolymer having a content of ethylene derived units ranging from 0.1 wt % to 4.5 wt %; and having a xylene soluble content measured at 25° C. lower than 10 wt %; and
b) from 48 wt % to 88 wt % of a propylene ethylene copolymer having a content of ethylene derived units ranging from 15 wt % to 42 wt %;
wherein the propylene composition has a melt flow rate (ISO 1133 230° C./2.16 kg) ranging from 0.5 to 20 g/10 min;

the sum of the amount of a) and b), being referred to the total weight % of a), and b) being 100 wt %; and
the sum of the amount of T1), T2) and T3), being referred to the total weight % of T1), T2), and T3) being 100 wt %.

2. The polypropylene composition according to claim 1 , wherein:
component T1 ranges from 40% by weight to 60% by weight;
component T2 ranges from 25% by weight to 45% by weight; and
component T3 ranges from 7% by weight to 15% by weight.

3. The polypropylene composition according to claim 1 , wherein
Component T1 ranges from 45% by weight to 55% by weight;
Component T2 ranges from 32% by weight to 42% by weight; and
Component T3 ranges from 8% by weight to 13% by weight.

4. The polypropylene composition according to claim 1 , wherein component T1 contains at least 85 wt % of rigid polypropylene items and having a purity of at least 92 wt %, wherein the remaining 8 wt % comprises other polymers, paper, cardboard, carton, aluminized plastic, and textiles.

5. The polypropylene composition according to claim 1 , wherein component T1-contains at least 90 wt % of rigid polypropylene items and having a purity of at least 94 wt %, wherein the remaining 6 wt % comprises other polymers, paper, cardboard, carton, aluminized plastic, and textiles.

6. The polypropylene composition according to claim 1 , wherein component T2 is a copolymer of ethylene and propylene containing from 2.0% to 6.0% by weight of ethylene units.

7. The polypropylene composition according to claim 1 , wherein component T2 is a copolymer of ethylene and propylene containing from 3.0% to 5.0% by weight of ethylene units.

8. The polypropylene composition according to claim 1 , wherein, in component T2, the xylene solubles at 25° C. ranges from 9.0 wt % to 6.0 wt %.

9. The polypropylene composition according to claim 1 , wherein component T2 has a melt flow rate (230° C./5 kg ISO 1133) from 0.6 to 2.0 g/10m.

10. The polypropylene composition according to claim 1 , wherein, in component T3, component a) ranges from 15 wt % to 43 wt % and component b) ranges from 57 wt % to 85 wt %.

11. The polypropylene composition according to claim 1 , wherein, in component T3), component a) is a propylene ethylene copolymer having an ethylene derived units content ranging from 1.5 wt % to 4.0 wt %.

12. The polypropylene composition according to claim 1 , wherein, in component T3), component b) has ethylene derived units content ranging from 21.0 wt % to 35.0 wt %.

13. The polypropylene composition according to claim 1 , having a melt flow rate (ISO 1133 230° C./2.16 kg) ranging from 1.0 to 10.0 g/10 min.

14. A blow molding article comprising the polypropylene composition of claim 1 .

15. A blow molding article according to claim 14 , wherein the article is a bottle.

Assignees

• Basell Poliolefine Italia Srl

Inventors

• Cavalieri Claudio
• Burgin Emanuele
• Galvan Monica
• Boehm Thomas

Classifications

• C08L2207/20

  Recycled plastic · CPC title

• C08L2205/035

  containing four or more polymers in a blend · CPC title

• C08L23/12 Primary

  Polypropene · CPC title

• C08L23/04 Primary

  Homopolymers or copolymers of ethene · CPC title