Heterophasic propylene copolymer with low CLTE

Abstract

A heterophasic propylene copolymer (HECO) comprising a polypropylene matrix having a melt flow rate MFR.sub.2 (230° C.) in the range of 45 to 75 g/10 min for the preparation of molde articles with low CLTE.

Claims

1. A polyolefin composition (PO) comprising: (a) at least 65 wt. %, based on the total weight of the polyolefin composition (PO), of a heterophasic propylene copolymer (HECO) comprising: (a) a (semi)crystalline polypropylene (PP) having a melt flow rate MFR.sub.2 (230° C.) measured according to ISO 1133 in the range of 42 to 75 g/10 min; and (b) an elastomeric propylene copolymer (ESC) dispersed in said (semi)crystalline polypropylene (PP); (b1) 2 to 15 wt. %, based on the total weight of the polyolefin composition (PO), of a high density polyethylene (HDPE) having a density in the range of 950 to 970 kg/m.sup.3; and/or (b2) 5 to 20 wt. %, based on the total weight of the polyolefin composition (PO), of an inorganic filler (F); wherein said heterophasic propylene copolymer (HECO) has: (i) a xylene cold soluble (XCS) fraction in the range of 25 to 38 wt. %; wherein further the xylene cold soluble (XCS) fraction of said heterophasic propylene copolymer (HECO) has: (ii) a comonomer content in the range of 30.0 to 65.0 mol %; and (iii) an intrinsic viscosity (IV) in the range of 1.70 to 2.30 dl/g.

2. A polyolefin composition (PO) according to claim 1, wherein the intrinsic viscosity (IV) of the xylene cold insoluble (XCI) fraction of the heterophasic propylene copolymer (HECO) is in the range of 1.15 to 1.35 dl/g.

3. A polyolefin composition (PO) comprising: (a) at least 65 wt. %, based on the total weight of the polyolefin composition (PO), of a heterophasic propylene copolymer (HECO) comprising: (a) a (semi)crystalline polypropylene (PP); and (b) an elastomeric propylene copolymer (ESC) dispersed in said (semi)crystalline polypropylene (PP); (b1) 2 to 15 wt. %, based on the total weight of the polyolefin composition (PO), of a high density polyethylene (HDPE) having a density in the range of 950 to 970 kg/m.sup.3; and/or (b2) 5 to 20 wt. %, based on the total weight of the polyolefin composition (PO), of an inorganic filler (F); wherein said heterophasic propylene copolymer (HECO) has: (i) a xylene cold soluble (XCS) fraction in the range of 25 to 38 wt. %; wherein further the xylene cold soluble (XCS) fraction of said heterophasic propylene copolymer (HECO) has: (ii) a comonomer content in the range of 30.0 to 65.0 mol %; and (iii) an intrinsic viscosity (IV) in the range of 1.70 to 2.30 dl/g; and wherein still further; (iv) the xylene cold insoluble (XCI) fraction of the heterophasic propylene copolymer (HECO) has an intrinsic viscosity (IV) in the range of 1.15 to 1.35 dl/g.

4. A polyolefin composition (PO) according to claim 1, the heterophasic propylene copolymer (HECO) having: (a) a melt flow rate MFR.sub.2 (230° C.) measured according to ISO 1133 in the range of 18 to 40 g/10 min; and/or (b) a comonomer content in the range of 8.5 to 25 mol %.

5. The polyolefin composition (PO) according to claim 1, the heterophasic propylene copolymer (HECO) complying with: (a) the in-equation (3): $\begin{array}{cc}\frac{\mathrm{MFR}\left(M\right)}{\mathrm{MFR}\left(T\right)}\le 4.0& \left(3\right)\end{array}$ wherein; MFR (M) is the melt flow rate MFR.sub.2 (230° C.) measured according to ISO 1133 (g/10 min) of the (semi)crystalline polypropylene (PP); MFR (T) is the melt flow rate MFR.sub.2 (230° C.) measured according to ISO 1133 (g/10 min) of the heterophasic propylene copolymer (HECO); and/or (b) the in-equation (2): $\begin{array}{cc}1.00\le \frac{\mathrm{IV}\left(\mathrm{XCS}\right)}{\mathrm{IV}\left(\mathrm{XCI}\right)}\le 2.00& \left(2\right)\end{array}$ wherein; IV (XCS) is the intrinsic viscosity (IV) [dl/g] of the xylene cold soluble (XCS) fraction of the heterophasic propylene copolymer (HECO), and IV (XCI) is the intrinsic viscosity (IV) [dl/g] of the xylene cold insoluble (XCI) fraction of the heterophasic propylene copolymer (HECO).

6. The polyolefin composition (PO) of according to claim 1, wherein said heterophasic propylene copolymer (HECO): (i) has a xylene cold soluble (XCS) fraction in the range of 27 to 35 wt. %, having a comonomer content in the range of 30.0 to 65.0 mol-% and an intrinsic viscosity (IV) in the range of 1.90 to 2.18 dl/g; (ii) has a melt flow rate MFR.sub.2 (230° C.) measured according to ISO 1133 in the range of 18 to 35 g/10 min; (iii) complies with the in-equation (2): $\begin{array}{cc}1.40\le \frac{\mathrm{IV}\left(\mathrm{XCS}\right)}{\mathrm{IV}\left(\mathrm{XCI}\right)}\le 1.80& \left(2\right)\end{array}$ wherein; IV (XCS) is the intrinsic viscosity (IV) [dl/g] of the xylene cold soluble (XCS) fraction of the heterophasic propylene copolymer (HECO), and IV (XCI) is the intrinsic viscosity (IV) [dl/g] of the xylene cold insoluble (XCI) fraction of the heterophasic propylene copolymer (HECO).

7. A polyolefin composition (PO) according to claim 6, wherein the heterophasic copolymer (HECO): (a) complies with the in-equation (3): $\begin{array}{cc}\frac{\mathrm{MFR}\left(M\right)}{\mathrm{MFR}\left(T\right)}\le 4.0& \left(3\right)\end{array}$ wherein; MFR (M) is the melt flow rate MFR.sub.2 (230° C.) measured according to ISO 1133 (g/10 min) of the (semi)crystalline polypropylene (PP); MFR (T) is the melt flow rate MFR.sub.2 (230° C.) measured according to ISO 1133 (g/10 min) of the heterophasic propylene copolymer (HECO); and/or (b) has a comonomer content in the range of 8.5 to 25 mol %; and/or (c) wherein the intrinsic viscosity (IV) of the xylene cold insoluble (XCI) fraction of the heterophasic propylene copolymer (HECO) is in the range of 1.15 to 1.35 dl/g.

8. A polyolefin composition (PO) according to claim 1, wherein: (a) the (semi)crystalline polypropylene (PP) is a (semi)crystalline propylene homopolymer (H-PP) having a xylene cold soluble (XCS) fraction of less than 4.5 wt. %; and/or (b) the elastomeric propylene copolymer (ESC) is an ethylene propylene rubber (EPR).

9. The polyolefin composition (PO) of claim 1, comprising: (a1) 70 to 90 wt. %, based on the total weight of the polyolefin composition (PO), of the heterophasic propylene copolymer (HECO); and wherein said heterophasic propylene copolymer (HECO): (i) has a xylene cold soluble (XCS) fraction in the range of 27 to 35 wt. %, having a comonomer content in the range of 30.0 to 65.0 mol % and an intrinsic viscosity (IV) in the range of 1.90 to 2.18 dl/g; (ii) has a melt flow rate MFR.sub.2 (230° C.) measured according to ISO 1133 in the range of 18 to 35 g/10 min; (iii) complies with the in-equation (2): $\begin{array}{cc}1.40\le \frac{\mathrm{IV}\left(\mathrm{XCS}\right)}{\mathrm{IV}\left(\mathrm{XCI}\right)}\le 1.80& \left(2\right)\end{array}$ wherein; IV (XCS) is the intrinsic viscosity (IV) [dl/g] of the xylene cold soluble (XCS) fraction of the heterophasic propylene copolymer (HECO), and IV (XCI) is the intrinsic viscosity (IV) [dl/g] of the xylene cold insoluble (XCI) fraction of the heterophasic propylene copolymer (HECO).

10. The polyolefin composition (PO) according to claim 1, wherein the polyolefin composition (PO) consists of: (a1) at least 75 wt. % based on the total weight of the polyolefin composition (PO), of the heterophasic propylene copolymer (HECO); (b1) 2 to 15 wt. % based on the total weight of the polyolefin composition (PO), of the high density polyethylene (HDPE) as defined herein; (c1) optionally up to 5.0 wt. %, based on the total weight of the polyolefin composition (PO), of alpha nucleating agents (NU); and (d1) optionally up to 8.0 wt. % based on the total weight of the polyolefin composition (PO), of additives (AD); or (a2) at least 75 wt. % on the total weight of the polyolefin composition (PO), of the heterophasic propylene copolymer (HECO); (b2) 2 to 15 wt. based on the total weight of the polyolefin composition (PO), of the inorganic filler (F); (c2) optionally up to 5.0 wt. % based on the total weight of the polyolefin composition (PO), of alpha nucleating agents (NU); and (d2) optionally up to 8.0 wt. based on the total weight of the polyolefin composition (PO), of additives (AD).

11. The polyolefin composition (PO) according to claim 1, consisting of: (a) 70 to 90 wt. based on the total weight of the polyolefin composition (PO), of the heterophasic propylene copolymer (HECO); (b) 2 to 15 wt. % based on the total weight of the polyolefin composition (PO), of the high density polyethylene (HDPE); and (c) 5 to 20 wt. %, based on the total weight of the polyolefin composition (PO), of the inorganic filler (F); (d) 10.sup.−5 to 2.0 wt. %, based on the total weight of the polyolefin composition (PO), of alpha nucleating agents (NU); and (e) optionally up to 8.0 wt. % based on the total weight of the polyolefin composition (PO), of additives (AD).

12. The polyolefin composition (PO) according to claim 1, wherein: (a) the polyolefin composition (PO) has a melt flow rate MFR.sub.2 (230° C.) measured according to ISO 1133 in the range of 15 to 40 g/10 min; and/or (b) the high density polyethylene (HDPE) has a melt flow rate MFR.sub.2 (190° C.) measured according to ISO 1133 in the range of 20 to 80 g/10 min.

13. The polyolefin composition (PO) according to claim 1, wherein: (a) the weight ratio between the inorganic filler (F) and the high density polyethylene (HDPE) [(F)/(HDPE)] is at least 0.6; and/or (b) the weight ratio between the xylene cold soluble (XCS) fraction of the heterophasic propylene copolymer (HECO) and the high density polyethylene (HDPE) [(XCS)/(HDPE)] is above 2.0; and/or (c) the weight ratio between the heterophasic propylene copolymer (HECO) and the high density polyethylene (HDPE) [(HECO)/(HDPE)] is in the range of 5/1 to 25/1.

14. The polyolefin composition (PO) according to claim 1, wherein the inorganic filler (F) has a cutoff particle size d95 [mass percent] of equal or below 3.3 μm.

15. The polyolefin composition (PO) according to claim 1, wherein the polyolefin composition (PO) has: (a) tensile modulus of at least 1100 MPa; and/or (b) impact strength at +23° C. of at least 20 kJ/m.sup.2; and/or (c) a coefficient of linear thermal expansion (CLTE) performed in a temperature range from −30 to +80° C. of not more than 80 μm/mK.

Description

EXAMPLES

1. Definitions/Measuring Methods

(1) The following definitions of terms and determination methods apply for the above general description of the invention as well as to the below examples unless otherwise defined.

(2) Quantification of Microstructure by NMR Spectroscopy

(3) Quantitative nuclear-magnetic resonance (NMR) spectroscopy was used to quantify the comonomer content of the polymers. Quantitative .sup.13C {.sup.1H} NMR spectra were recorded in the solution-state using a Bruker Advance III 400 NMR spectrometer operating at 400.15 and 100.62 MHz for .sup.1H and .sup.13C respectively. All spectra were recorded using a .sup.13C optimised 10 mm extended temperature probehead at 125° C. using nitrogen gas for all pneumatics. Approximately 200 mg of material was dissolved in 3 ml of 1,2-tetrachloroethane-d.sub.2 (TCE-d.sub.2) along with chromium-(III)-acetylacetonate (Cr(acac).sub.3) resulting in a 65 mM solution of relaxation agent in solvent (Singh, G., Kothari, A., Gupta, V., Polymer Testing 28 5 (2009), 475). To ensure a homogenous solution, after initial sample preparation in a heat block, the NMR tube was further heated in a rotatary oven for at least 1 hour. Upon insertion into the magnet the tube was spun at 10 Hz. This setup was chosen primarily for the high resolution and quantitatively needed for accurate ethylene content quantification. Standard single-pulse excitation was employed without NOE, using an optimised tip angle, 1 s recycle delay and a bi-level WALTZ16 decoupling scheme (Zhou, Z., Kuemmerle, R., Qiu, X., Redwine, D., Cong, R., Taha, A., Baugh, D. Winniford, B., J. Mag. Reson. 187 (2007) 225; Busico, V., Carbonniere, P., Cipullo, R., Pellecchia, R., Severn, J., Talarico, G., Macromol. Rapid Commun. 2007, 28, 1128). A total of 6144 (6k) transients were acquired per spectra.

(4) Quantitative .sup.13C {.sup.1H} NMR spectra were processed, integrated and relevant quantitative properties determined from the integrals using proprietary computer programs. All chemical shifts were indirectly referenced to the central methylene group of the ethylene block (EEE) at 30.00 ppm using the chemical shift of the solvent. This approach allowed comparable referencing even when this structural unit was not present. Characteristic signals corresponding to the incorporation of ethylene were observed Cheng, H. N., Macromolecules 17 (1984), 1950).

(5) With characteristic signals corresponding to 2,1 erythro regio defects observed (as described in L. Resconi, L. Cavallo, A. Fait, F. Piemontesi, Chem. Rev. 2000, 100 (4), 1253, in Cheng, H. N., Macromolecules 1984, 17, 1950, and in W-J. Wang and S. Zhu, Macromolecules 2000, 33 1157) the correction for the influence of the regio defects on determined properties was required. Characteristic signals corresponding to other types of regio defects were not observed.

(6) The comonomer fraction was quantified using the method of Wang et. al. (Wang, W-J., Zhu, S., Macromolecules 33 (2000), 1157) through integration of multiple signals across the whole spectral region in the .sup.13C {.sup.1H} spectra. This method was chosen for its robust nature and ability to account for the presence of regio-defects when needed. Integral regions were slightly adjusted to increase applicability across the whole range of encountered comonomer contents.

(7) For systems where only isolated ethylene in PPEPP sequences was observed the method of Wang et. al. was modified to reduce the influence of non-zero integrals of sites that are known to not be present. This approach reduced the overestimation of ethylene content for such systems and was achieved by reduction of the number of sites used to determine the absolute ethylene content to:
E=0.5(Sββ+Sβγ+Sβδ+0.5(Sαβ+Sαγ))

(8) Through the use of this set of sites the corresponding integral equation becomes:
E=0.5(I.sub.H+I.sub.G+0.5(I.sub.C+I.sub.D))
using the same notation used in the article of Wang et. al. (Wang, W-J., Zhu, S., Macromolecules 33 (2000), 1157). Equations used for absolute propylene content were not modified.

(9) The mole percent comonomer incorporation was calculated from the mole fraction:
E[mol %]=100*fE

(10) The weight percent comonomer incorporation was calculated from the mole fraction:
E[wt %]=100*(fE*28.06)/((fE*28.06)+((1−fE)*42.08))

(11) The comonomer sequence distribution at the triad level was determined using the analysis method of Kakugo et al. (Kakugo, M., Naito, Y., Mizunuma, K., Miyatake, T. Macromolecules 15 (1982) 1150). This method was chosen for its robust nature and integration regions slightly adjusted to increase applicability to a wider range of comonomer contents.

(12) MFR.sub.2 (230° C.) is measured according to ISO 1133 (230° C., 2.16 kg load).

(13) MFR.sub.2 (190° C.) is measured according to ISO 1133 (190° C., 2.16 kg load).

(14) Density is measured according to ISO 1183-1—method A (2004). Sample preparation is done by compression moulding in accordance with ISO 1872-2:2007.

(15) Xylene cold soluble fraction (XCS wt.-%): Content of xylene cold solubles (XCS) is determined at 25° C. according ISO 16152; first edition; 2005-07-01. The part which remains insoluble is the xylene cold insoluble (XCI) fraction.

(16) Intrinsic viscosity is measured according to DIN ISO 1628/1, October 1999 (in Decalin at 135° C.).

(17) The tensile modulus and tensile strain at break were measured according to ISO 527-2 (cross head speed=1 mm/min; 23° C.) using injection molded specimens as described in EN ISO 1873-2 (dog bone shape, 4 mm thickness). The measurement is done after 96 h conditioning time of the specimen.

(18) Charpy notched impact strength is determined according to ISO 180/1A at 23° C. and at −20° C. by using injection moulded test specimens as described in EN ISO 1873-2 (80×10×4 mm).

(19) Median particle size (D.sub.50) (Sedimentation) is calculated from the particle size distribution [mass percent] as determined by gravitational liquid sedimentation according to ISO 13317-3 (Sedigraph)

(20) Cutoff particle size (D.sub.95) (Sedimentation) is calculated from the particle size distribution [mass percent] as determined by gravitational liquid sedimentation according to ISO 13317-3 (Sedigraph)

(21) Coefficient of linear thermal expansion: The coefficient of linear thermal expansion (CLTE) was determined in accordance with ISO 11359-2:1999 on 10 mm long pieces cut from the same injection molded specimens as used for the tensile modulus determination. The measurement was performed in a temperature range from −30 to +80° C. at a heating rate of 1° C./min and a temperature range from 23 to +80° C. at a heating rate of 1° C./min in machine direction, respectively.

(22) Shrinkage (SH) radial and Shrinkage (SH) tangential were determined on centre gated, injection moulded circular disks (diameter 180 mm, thickness mm, having a flow angle of 355° and a cut out of 5°). Two specimens 180×2 mm are moulded applying holding pressure between 590 to 640 bar. The melt temperature at the gate is 260° C., and the average flow front velocity in the mould 100 mm/s. Tool temperature: 40° C., back pressure: 600 bar.

(23) Preparation of HECOs 1 to 4

(24) Catalyst for HECO1, HECO2 and HECO4

(25) First, 0.1 mol of MgCl.sub.2×3 EtOH was suspended under inert conditions in 250 ml of decane in a reactor at atmospheric pressure. The solution was cooled to the temperature of −15° C. and 300 ml of cold TiCl.sub.4 was added while maintaining the temperature at said level. Then, the temperature of the slurry was increased slowly to 20° C. At this temperature, 0.02 mol of dioctylphthalate (DOP) was added to the slurry. After the addition of the phthalate, the temperature was raised to 135° C. during 90 minutes and the slurry was allowed to stand for 60 minutes. Then, another 300 ml of TiCl.sub.4 was added and the temperature was kept at 135° C. for 120 minutes. After this, the catalyst was filtered from the liquid and washed six times with 300 ml heptane at 80° C. Then, the solid catalyst component was filtered and dried. Catalyst and its preparation concept is described in general e.g. in patent publications EP 0 491 566, EP 0 591 224 and EP 0 586 390.

(26) The catalyst was further modified (VCH modification of the catalyst). 35 ml of mineral oil (Paraffinum Liquidum PL68) was added to a 125 ml stainless steel reactor followed by triethyl aluminium (TEAL) and dicyclopentyl dimethoxy silane (donor D) for HECO1 and HECO2 and by triethyl aluminium (TEAL) and diethylaminotriethoxysilane (U-donor) for HECO4, respectively, under inert conditions at room temperature. After 10 minutes 5.0 g of the catalyst prepared above (Ti content 1.4 wt.-%) was added and after additionally 20 minutes 5.0 g of vinylcyclohexane (VCH) was added. The temperature was increased to 60° C. during 30 minutes and was kept there for 20 hours. Finally, the temperature was decreased to 20° C. and the concentration of unreacted VCH in the oil/catalyst mixture was analysed and was found to be 200 ppm weight.

(27) Catalyst for HECO3

(28) 80 mg of ZN104-catalyst of LyondellBasell is activated for 5 minutes with a mixture of Triethylaluminium (TEAL; solution in hexane 1 mol/l) and Dicyclopentyldimethoxysilane as donor (0.3 mol/l in hexane)—in a molar ratio of 18.7 (Co/ED) after a contact time of 5 min- and 10 ml hexane in a catalyst feeder. The molar ratio of TEAL and Ti of catalyst is 220

(29) (Co/TC)). After activation the catalyst is spilled with 250 g propylene into the stirred reactor with a temperature of 23° C. Stirring speed is hold at 250 rpm. After 6 min prepolymersation at 23° C. the polymerisation starts as indicated in table 1.

(30) TABLE-US-00001 TABLE 1 Polymerization of HECOs 1 to 4 HECO1 HECO2 HECO3 HECO4 IE1 IE2 CE1 CE2 Prepoly Residence time [h] 0.25 0.29 0.27 0.25 Temperature [° C.] 27 28 28 30 Co/ED ratio [mol/mol] 5.94 5.90 5.90 5.1 Co/TC ratio [mol/mol] 184 229 395 190 Loop (R1) Residence time [h] 0.26 0.41 0.29 0.22 Temperature [° C.] 61 62 61 72 H.sub.2/C.sub.3 ratio [mol/kmol] 13.9 10.6 4.06 26.9 MFR [g/10 min] 63 50 43 294 XCS [wt %] 3.3 2.3 3.2 3.4 C2 content [mol %] 0 0 0 0 1.sup.st GPR (R2) Residence time [h] 0.09 0.10 0.28 0.34 Temperature [° C.] 79 80 80 87 Pressure [kPa] 15 15 14 22 H.sub.2/C.sub.3 ratio [mol/kmol] 161 151 28 21 MFR [g/10 min] 63 48 36 230 XCS [wt %] 3.4 1.8 3.1 3.1 C2 content [mol %] 0 0 0 0 2.sup.nd GPR (R3) Residence time [h] 0.12 0.19 0.60 0.13 Temperature [° C.] 60 60 59 82 Pressure [kPa] 13 14 14 22 C.sub.2/C.sub.3 ratio [mol/kmol] 548 550 546 305 H.sub.2/C.sub.2 ratio [mol/kmol] 472 508 487 22 MFR [g/10 min] 33 25 18 67 XCS [wt %] 22 24 22.5 21.6 C2 content [mol %] 12.6 15.6 0 13.9 3.sup.rd GPR (R4) Residence time [h] 0.12 0.32 0.48 0.58 Temperature [° C.] 80 80 80 85 Pressure [kPa] 1500 1500 15 2600 22 C.sub.2/C.sub.3 ratio [mol/kmol] 549 551 550 305 H.sub.2/C.sub.2 ratio [mol/kmol] 391 508 485 71.8 MFR.sub.2 [g/10 min] 23 21 13 35 Split [—] 66.1/33.9 64.5/35.5 69/31 72.4/27.6 (R1 + 2/R3 + 4) XCS [wt %] 32.8 32.7 30.9 31 IV of XCI [dl/g] 1.22 1.28 1.36 0.91 IV of XCS [dl/g] 2.12 2.02 2.3 2.7 C2 of XCS [mol %] 49.0 50.3 56.1 47.4 C2 content [mol %] 20.9 20.0 22.2 19.2

(31) The HECOs 1 to 4 have been produced in a Borstar pilot plant.

(32) The HECOs 1 to 4 were mixed in a twin-screw extruder with 0.2 wt % of Songnox 11B FF which is is a blend of SONGNOX′ 1010, a primary high molecular weight hindered phenolic antioxidant, with SONGNOX.sup.B 1680, a secondary phosphite antioxidant supplied by BASF AG, and 0.05 wt % Calcium stearate (CAS-no. 1592-23-0) supplied by Croda Polymer Additives.

(33) The inventive and comparative compositions were melt blended on a co-rotating twin screw extruder.

(34) TABLE-US-00002 TABLE 2 Properties of the examples Units IE1 IE2 CE1 CE2 IE3 IE4 IE5 CE3 HECO1 [wt.-%] 100 — — 95 90 — — HECO2 [wt.-%] — 100 — — — 95 — HECO3 [wt.-%] — — 100 — — — — HECO4 [wt.-%] — — 100 — — — 84 HDPE1 [wt.-%] — — — 5 10 5 — HDPE2 [wt.-%] — — — — — — 16 MFR [g/10 min] 22 20 12 35 23 21 19 32 SHr [%] 1.36 1.16 1.26 nm 1.16 1.13 1.14 1.50 SHt [%] 1.28 1.11 1.17 nm 1.12 1.08 1.15 1.40 TM [MPa] 983 984 900 1197 974 973 954 1076 TS [%] 117 378 400 17 385 398 373 22 CHI(23) [kJ/m.sup.2] 28.5 42 33 13 39 37 45 14 CHI(−20) [kJ/m.sup.2] 7 8 7 6 7 5 6 6 CLTE 23/80° C. [μm/mK] 121 109 110 — 100 92 96 109 CLTE −30/80° C. [μm/mK] 106 97 95 110 89 84 87 96

(35) TABLE-US-00003 TABLE 3 Properties of the examples Units IE6 IE7 IE8 IE9 CE4 CE5 HECO1 [wt.-%] 89.75 79.75 — — — — HECO2 [wt.-%] — — 90 83 — — HECO3 [wt.-%] — — — — — — HECO4 [wt.-%] — — — — 69 75.5 HECO5 [wt.-%] — — — —  7 — HDPE1 [wt.-%] — 10 — 7 — — HDPE2 [wt.-%] — — — — 14 14.5 Talc1 [wt.-%] 10 10 — — — Talc2 [wt.-%] — — 10 10  7 7 MFR [g/10 min] 24 21 21 21 24 29 SHr [%] 0.97 0.93 0.98 0.94  .sup. 1.26 1.28 SHt [%] 0.87 0.88 0.95 0.90 nm nm TM [Mpa] 1516 1410 1368 1283 1311  1327 TS [%] 105 80 365 378 37 19 CHI(23) [kJ/m.sup.2] 30 45 23 37 45 10 CHI(−20) [kJ/m.sup.2] 5 7 5 5  6 2.3 CLTE23 [μm/mK] 70 64 73 71 nm nm CLTE −30 [μm/mK] 63 60 68 65 83 84
nm not measured
SHr shrinkage (SH) radial
SHt shrinkage (SH) tangential
TM Tensile Modulus
TS Tensile Strain at break
CHI(23) Charpy impact strength at 23° C.
CHI(−20) Charpy impact strength at −20° C.
CLTE23 CLTE +23/80° C./MD
CLTE-30 CLTE −30/80° C./MD

(36) HDPE1 is the commercial high density polyethylene Stamylex 2H 280 of Borealis AG having a MFR.sub.2 (190° C./2.16 kg) of 25 g/10 min and a density of 966 kg/m.sup.3.

(37) HDPE2 is the commercial high density polyethylene MG 9601 of Borealis AG having a MFR.sub.2 (190° C./2.16 kg) of 28 g/10 min and a density of 966 kg/m.sup.3.

(38) HECO 5 is the commercial heterophasic propylene copolymer of Borealis AG with the following properties:

(39) MFR.sub.2 (230° C.) of matrix: 8 g/10 min

(40) MFR.sub.2 (230° C.) total: 7 g/10 min

(41) XCS: 23 wt.-%

(42) C2 total: 11.5 mol %

(43) C2 in XCS: 33.3 mol-%

(44) IV of XCI: 1.9 dl/g

(45) IV of XCS: 1.2 dl/g

(46) Talc 1 is the commercial talc is HAR T84 of Luzenac having median particle size (D.sub.50) [mass percent] of 2 μm and, a cutoff particle size (D.sub.95) [mass percent] of 10 μm (sedigraph).

(47) Talc 2 is the commercial talc Jetfine 3CA of Luzenac having median particle size (D.sub.50) [mass percent] of 1 μm and a cutoff particle size (D.sub.95) [mass percent] of 3.3 μm (sedigraph).