Reinforced polyolefin composition comprising recycled plastic material

Patent metadata

Field	Value
Publication number	US-12486367-B2
Application number	US-202117927391-A
Country	US
Kind code	B2
Filing date	May 25, 2021
Priority date	May 27, 2020
Publication date	Dec 2, 2025
Grant date	Dec 2, 2025

Abstract

Provided is a polyolefin composition including a blend of recycled plastic material including polyproplyene and polyethylene, which is recovered from a waste plastic material derived from post-consumer and/or post-industrial waste; glass fibres; talc; at least one coupling agent; and at least one impact modifier. The polyolefin composition has a tensile modulus of at least 4 GPa, and an impact strength of at least 10 kJ/m2.

First claim

The invention claimed is:

1 . A polyolefin composition comprising
a) 7-82.5 wt % of a blend of recycled plastic material comprising polypropylene and polyethylene, which is recovered from a waste plastic material derived from post-consumer and/or post-industrial waste; b) 10-40 wt % of glass fibres; c) 5-30 wt % talc; d) 0.5-3 wt % of at least one coupling agent; and e) 2-20 wt % of at least one impact modifier, wherein the polyolefin composition is optionally free of any virgin polyethylene and wherein the polyolefin composition has
a tensile modulus of at least 4 GPa, and
an impact strength of at least 10 kJ/m 2 .

2 . The polyolefin composition according to claim 1 , having
a tensile modulus of at least 5 GPa, and an impact strength of at least 15 kJ/m 2 .

3 . The polyolefin composition according to claim 1 , wherein the tensile modulus of the polyolefin composition is 4 to 7 GPa and the impact strength is 10 to 25 kJ/m 2 .

4 . The polyolefin composition according to claim 1 , wherein the blend of recycled plastic material comprises at least 50 wt % polypropylene.

5 . The polyolefin composition according to claim 4 , wherein the blend of recycled plastic material comprises at least 60 wt % polypropylene.

6 . The polyolefin composition according to claim 1 , wherein the blend of recycled plastic material comprises at least 10 wt % polyethylene.

7 . The polyolefin composition according to claim 6 , wherein the blend of recycled plastic material comprises at least 30 wt %.

8 . The polyolefin composition according to claim 1 , wherein the blend of recycled plastic material comprises
A-1) a content of polypropylene of 30-98 wt.-%, A-2) a content of polyethylene of 2-50 wt.-% A-3) 0 to 5.0 wt.-% of polystyrene, A-4) 0 to 3.0 wt.-% stabilizers, A-5) 0 to 4.0 wt.-% polyamide-6, A-6) 0 to 3.0 wt.-% talc, A-7) 0 to 3.0 wt.-% chalk, A-8) 0 to 1.0 wt.-% paper, A-9) 0 to 1.0 wt.-% wood, A-10) 0 to 0.5 wt.-% metal, A-11) 0.1 ppm to 100 ppm of limonene as determined by using solid phase microextraction (HS-SPME-GC-MS), and A-12) 0 to 200 ppm total fatty acid content as determined by using solid phase microextraction (HS-SPME-GC-MS), wherein all amounts are given with respect to the total weight of blend.

9 . The polyolefin composition according to claim 1 , wherein the melt flow rate (ISO 1133, 2.16 kg, 230° C.) of the polyolefin composition is 0.5 to 6 g/10 min and the density of the polyolefin composition is 800 to 1500 kg/m 3 .

10 . The polyolefin composition according to claim 9 , wherein the melt flow rate (ISO 1133, 2.16 kg, 230° C.) of the polyolefin composition is 1.5 to 5 g/10 min and the density of the polyolefin composition is 850 to 1300 kg/m 3 .

11 . The polyolefin composition according to claim 1 , wherein the glass fibers have a length of 2.0 to 10.0 mm and a diameter of from 5 to 20 μm.

12 . The polyolefin composition according to claim 1 , wherein the talc comprises particles with a size d 50 of 2.5-5 μm.

13 . The polyolefin composition according to claim 1 , wherein the at least one coupling agent is a functionalized polypropylene.

14 . The polyolefin composition according to claim 13 , wherein the at least one coupling agent is a polypropylene functionalized with maleic anhydride (MAH).

15 . The polyolefin composition according to claim 1 , having 5-12 wt % of the impact modifier.

16 . The polyolefin composition according to claim 15 , wherein the impact modifier comprises an ethylene based 1-octene elastomer.

17 . The polyolefin composition according to claim 1 , further comprising further additives.

18 . The polyolefin composition according to claim 17 , wherein the additives comprise carbon black, at least one antioxidant and/or at least one UV stabilizer.

19 . An article comprising the polyolefin composition according to claim 1 .

20 . A process for preparing the polyolefin composition according to claim 1 , comprising the steps of
providing a mixture of the blend, glass fibers, talc, a coupling agent and an impact modifier in the required amounts; melting the mixture in an extruder, and optionally pelletizing the obtained polyolefin composition.

Assignees

• Borealis Ag

Inventors

• Abbasi Mahdi
• Kahlen Susanne Margarete
• Braun Hermann
• Stockreiter Wolfgang
• Jerabek Michael

Classifications

• C08K2201/003

  Additives being defined by their diameter · CPC title

• C08K7/14

  Glass · CPC title

• C08K3/40

  Glass · CPC title

• C08K3/36

  Silica · CPC title

• C08K3/04

  Carbon · CPC title