IP Library › Granted Patent US 12,415,912
Granted Patent B2
US 12,415,912 · App. 16/754,504 · Granted Sep 16, 2025

Filled polypropylene (PP) compositions with improved thermo-mechanical properties

Inventors: Jingbo Wang (Linz, AT); Simon Schwarzenberger (Linz, AT); Klaus Bernreitner (Linz, AT); Markus Gahleitner (Linz, AT); Ville Virkkunen (Porvoo, FI)
Assignee: BOREALIS AG
C08L23/12C08K3/22C08K3/30C08K3/346C08K5/523C08K2003/2224C08K2003/3063C08K2201/003C08K2201/006C08L2205/24
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Quick Facts
Patent No.
US 12,415,912
App. No.
16/754,504
Granted
Sep 16, 2025
Kind
B2
Abstract

The present application relates to a polypropylene (PP) composition comprising a) 50.0 to 95.0 wt.-%, based on the total weight of the polypropylene (PP) composition, of a polypropylene (PP) homopolymer being polymerized in the presence of a single-site catalyst and b) 5.0 to 50.0 wt.-%, based on the total weight of the polypropylene (PP) composition, of a mineral filler, to an article comprising the polypropylene (PP) composition as well as the use of the polypropylene (PP) composition for improving the thermo-mechanical properties.

Claims (31)

1. A polypropylene (PP) composition consisting of:

a) 50.0 to 95.0 wt. %, based on the total weight of the polypropylene (PP) composition, of a polypropylene (PP) homopolymer that is prepared in the presence of a single-site catalyst and having:

i) a melt flow rate MFR 2 (230° C.) measured according to ISO 1133 in the range of 1 to 200 g/10 min,

ii) a melting temperature (T m ) measured by differential scanning calorimetry (DSC) of ≥153° C., and

iii) a molecular weight distribution Mw/Mn measured according to ISO 16014 in the range of 3.6 to 4.5,

b) 5.0 to 50.0 wt. %, based on the total weight of the polypropylene (PP) composition, of a mineral filler,

c) up to 2.0 wt. %, based on the total weight of the polypropylene composition, of one or more additives selected from the group consisting of acid scavenger, colorants, pigments, anti-scratch agents, dispersing agents, UV stabilizers, antistatic agents, demoulding agents and carriers,

d) optionally from 0.002 to 1.5 wt. %, based on the total weight of the polypropylene composition, of a nucleating agent comprising a phosphate-based α-nucleating agent, and

e) optionally further polymer(s) different to the polypropylene (PP) homopolymer in an amount not exceeding in total 2.0 wt. %, based on the total weight of the polypropylene (PP) composition, wherein the further polymer(s) different to the polypropylene homopolymer is/are carrier polymer(s) for additives.

2. The polypropylene (PP) composition according to claim 1 , wherein the polypropylene (PP) homopolymer is unimodal.

3. The polypropylene (PP) composition according to claim 1 , wherein the polypropylene (PP) homopolymer has

a) a melt flow rate MFR 2 (230° C.) measured according to ISO 1133 in the range of 2 to 100 g/10 min, and/or

b) a melting temperature (T m ) measured by differential scanning calorimetry (DSC) in the range from 153 to 165° C., and/or

c) a heat deflection temperature HDT B measured in accordance with ISO 75 at a load of 0.46 MPa of at least 90° C.

4. The polypropylene (PP) composition according to claim 1 , wherein the polypropylene (PP) homopolymer has:

a) a xylene cold soluble fraction (XCS) determined at 23° C. according ISO 16152 of equal or below 2.0 wt. %, and/or

b) a weight average molecular weight (Mw) measured according to ISO 16014 in the range from 80 to 500 kg/mol, and/or

c) an isotactic triad fraction (mm) determined from 13C-NMR spectroscopy of at least 98.0%, and/or

d) a content of <2,1> erythro regiodefects as determined from 13C-NMR spectroscopy in the range from 0.10 to 1.00 mol. %.

5. The polypropylene (PP) composition according to claim 1 , wherein the polypropylene (PP) homopolymer has a flexural modulus measured according to ISO 178 of at least 1300 MPa.

6. The polypropylene (PP) composition according to claim 1 , wherein the mineral filler is an anisotropic mineral filler.

7. The polypropylene (PP) composition according to claim 1 , wherein the mineral filler has a particle size d 50 in the range from 0.1 to 10 μm.

8. The polypropylene (PP) composition according to claim 1 , wherein the polypropylene (PP) composition has:

a) a melt flow rate MFR 2 (230° C., 2.16 kg) measured according to ISO 1133 in the range from 0.5 to 175 g/10 min, and/or

b) a melting temperature (T m ) measured by differential scanning calorimetry (DSC) in the range from 154 to 165° C., and/or

c) a crystallization temperature (T c ) measured by differential scanning calorimetry (DSC) in the range from 120 to 135° C., and/or

d) a flexural modulus measured according to ISO 178 in the range from 2700 to 6500 MPa, and/or

e) a heat deflection temperature (HDT) measured according to ISO 75 A at a load of 1.8 MPa in the range of 76 to 95° C.

9. The polypropylene (PP) composition according to claim 1 , wherein the polypropylene (PP) composition has a ratio of melting temperature (T m ) measured by differential scanning calorimetry (DSC) to heat deflection temperature (HDT) measured according to ISO 75 A [T m /HDT] of ≤2.0.

10. An article comprising the polypropylene (PP) composition according to claim 1 .

11. The article according to claim 10 , wherein the article is an automotive interior article.

Assignments (2)
CHANGE OF ADDRESS Recorded Feb 23, 2022
From: BOREALIS AG
To: BOREALIS AG
Reel/Frame 059219/0949 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 9, 2020
From: WANG, JINGBO; SCHWARZENBERGER, SIMON; BERNREITNER, KLAUS; GAHLEITNER, MARKUS; VIRKKUNEN, VILLE
To: BOREALIS AG
Reel/Frame 052883/0393 →
Priority Claims (1)
EP 17198353 · Oct 25, 2017 · regional
Continuity (1)
Related Publication 20200392318A1 · Dec 17, 2020
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