Mixed-plastics-polypropylene blend

Patent metadata

Field	Value
Publication number	US-12084566-B2
Application number	US-202218283128-A
Country	US
Kind code	B2
Filing date	Mar 25, 2022
Priority date	Mar 26, 2021
Publication date	Sep 10, 2024
Grant date	Sep 10, 2024

Abstract

Mixed-plastics polypropylene blend including mainly polypropylene being benzene free with defined CIELAB color.

First claim

The invention claimed is:

1. A mixed-plastics polypropylene blend having:
(i) a crystalline fraction (CF) content determined according to CRYSTEX QC analysis in the range from 86.0 to 94.0 wt.-%, and
(ii) a soluble fraction (SF) content determined according to CRYSTEX QC analysis in the range from 6.0 to 14.0 wt.-%, wherein
(iii) the crystalline fraction (CF) has a propylene content (C3(CF)) as determined by FT-IR spectroscopy calibrated by quantitative 13 C-NMR spectroscopy, in the range from 95.0 to 99.0 wt.-%; and wherein
(iv) the crystalline fraction (CF) has an ethylene content (C2(CF)), as determined by FT-IR spectroscopy calibrated by quantitative 13 C-NMR spectroscopy, in the range from 1.0 to 5.0 wt.-%; and
(v) the soluble fraction (SF) has an intrinsic viscosity (iV(SF)) in the range from 1.10 to below 1.50 dl/g; and
wherein
(vi) the mixed-plastics polypropylene blend has inorganic residues as measured by calcination analysis (TGA) according to DIN ISO 1172:1996 of 0.05 to 3.0 wt.-%, with respect to the mixed-plastics polypropylene blend; and
wherein
(vii) the mixed-plastics polypropylene blend does not contain benzene above the detection limit of HS GC-MS 80° C./2 h; and
wherein
(viii) the mixed-plastics polypropylene blend has a CIELAB color space (L*a*b*) of
L* from 72.0 to 97.0;
a* from −5.0 to 0.0;
b* from 0.0 to below 22.0; and

the mixed-plastics polypropylene blend has a Large Amplitude Oscillatory Shear
Non-Linear Factor [LAOS-NLF] (190° C., 1000%) higher than 2.3, wherein

L
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A
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O
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S
-
N
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L
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F

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G
1
′

G
3
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whereby
G 1 ′ is the first order Fourier Coefficient
G 3 ′ is the third order Fourier Coefficient,

wherein the mixed plastics polypropylene blend is a recycled material.

2. The mixed-plastics polypropylene blend according to claim 1 having a melt flow rate (ISO1133, 2.16 kg; 230° C.) of 2.0 to 100 g/10 min.

3. The mixed-plastics polypropylene blend according to claim 1 containing one or more of the following substances:
a) polystyrene
b) polyamide-6
c) limonene as determined by using solid phase microextraction (HS-SPME-GC-MS)
d) fatty acids as determined by using solid phase microextraction (HS-SPME-GC-MS).

4. The mixed-plastics polypropylene blend according to claim 1 wherein the soluble fraction (SF) obtained by CRYSTEX QC analysis has an ethylene content (C2(SF)), as determined by FT-IR spectroscopy calibrated by quantitative 13 C-NMR spectroscopy, in the range from 12.0 to 32.0 wt.-%.

5. The mixed-plastics polypropylene blend according to claim 1 having an odor (VDA270-B3) of 4 or lower.

6. The mixed-plastics polypropylene blend according to claim 1 having a Large Amplitude Oscillatory Shear-Non-Linear Factor [LAOS-NLF] (190° C., 1000%) higher than 2.7, wherein

L
⁢
A
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O
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S
-
N
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L
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F

=

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G
1
′

G
3
′

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wherein
G 1 ′ the first order Fourier Coefficient
G 3 ′ is the third order Fourier Coefficient.

7. The mixed-plastics polypropylene blend according to claim 1 having a tensile modulus (ISO 527-2 at a cross head speed of 1 mm/min; 23° C.) using injection molded specimens as described in EN ISO 1873-2 (dog bone shape, 4 mm thickness) of at least 1200 MPa.

8. The mixed-plastics polypropylene blend according to claim 1 having a notched Charpy impact strength (NIS) (1eA) (non-instrumented, ISO 179-1 at +23° C.) according to ISO 179-1 eA at +23° C. on injection moulded specimens of 80×10×4 mm prepared according to EN ISO 1873-2 of at least 8.0 kJ/m 2 , wherein further the soluble fraction (SF) obtained by CRYSTEX QC analysis has an ethylene content (C2(SF)), as determined by FT-IR spectroscopy calibrated by quantitative 13 C-NMR spectroscopy, in the range from 12.0 to 20.0 wt.-% and further the mixed-plastics polypropylene blend has a CIELAB color space (L*a*b) of
L* from 72.0 to 97.0;
a* from −5.0 to 0.0;
b* from 0.0 to below 22.0
and further a crystalline fraction (CF) content determined according to CRYSTEX QC analysis in the range from 91.0 to 94.0 wt.-% and a soluble fraction (SF) content determined according to CRYSTEX QC analysis of 6.0 to 9.0 wt.-%.

9. The mixed-plastics polypropylene blend according to claim 1 being in the form of pellets.

10. The mixed-plastics polypropylene blend according to claim 1 being visbroken by peroxides.

11. A molded article made from the mixed-plastics polypropylene blend according to claim 1 .

12. A blend containing the mixed-plastics polypropylene blend according to claim 1 and at least one virgin polyolefin.

13. A blend containing the mixed-plastics polypropylene blend according to claim 1 and at least one virgin polyolefin being a heterophasic polypropylene.

Assignees

• Borealis Ag

Inventors

• TRAN Tuan Anh
• Lopes Filipe Susana
• Nagl Andreas
• Machl Doris
• Rössler-Czermak Andreas

Classifications

• 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

• C08L23/16

  Ethylene-propylene or ethylene-propylene-diene copolymers · CPC title

• B29K2995/002

  Coloured · CPC title

• B29K2105/26

  Scrap {or recycled material} · CPC title

• B29K2023/14

  Copolymers of polypropylene (B29K2023/16 takes precedence) · CPC title