POLYPROPYLENE COMPOSITION

Abstract

The invention is directed to a polypropylene composition, to a three-dimensional article comprising said polypropylene composition, and to the use of said composition for automotive articles. The polypropylene composition of the invention comprises: 40-90% by total weight of the composition of a polymer blend comprising polypropylene having a melt flow index as measured according to ISO 1133 at 230° C. and 2.16 kg of 2.0-100 g/10 min; 5-25% by total weight of the composition of one or more plastomers; 0.5-25% by total weight of the composition of mineral filler selected from the group consisting of phyllosilicates, mica or wollastonite; and 0.2-4% by total weight of the composition of glass fibres having an average fibre diameter in the range of 5-30 μm.

Claims

1. Polypropylene composition comprising: 40-90% by total weight of the composition of a polymer blend comprising polypropylene having a melt flow index as measured according to ISO 1133 at 230° C. and 2.16 kg of 2.0-100 g/10 min; 5-25% by total weight of the composition of one or more plastomers; 0.5-25% by total weight of the composition of mineral filler selected from the group consisting of phyllosilicates, mica or wollastonite; and 0.2-4% by total weight of the composition of glass fibres having an average fibre diameter in the range of 5-30 μm.

2. Polypropylene composition according to claim 1, comprising: 50-80% by total weight of the composition of the polymer blend; 7-20% by total weight of the composition of the one or more plastomers; 1-20% by total weight of the composition of the mineral filler; and 0.5-3% by total weight of the composition of the glass fibres.

3. Polypropylene composition according to claim 1, comprising: 60-75% by total weight of the composition of the polymer blend; 10-20% by total weight of the composition of the one or more plastomers; 2-15% by total weight of the composition of talc mineral filler; and 0.5-2.5% by total weight of the composition of the glass fibres

4. Polypropylene composition according to claim 1, wherein said polymer blend comprises a heterophasic polypropylene copolymer having a crystalline propylene-based matrix and a dispersed ethylene-olefin copolymer.

5. Wherein the amount of crystalline propylene-based matrix is 50-95% by weight of the heterophasic polypropylene copolymer and the amount of dispersed ethylene-olefin copolymer is 50-5% by weight of the heterophasic polypropylene copolymer.

6. Polypropylene composition according to claim 1, wherein said polymer blend comprises a modified polypropylene.

7. Polypropylene composition according to claim 6, wherein said modified polypropylene is a polypropylene grafted with an unsaturated organic carboxylic acid, or an anhydride, ester, or a salt thereof

8. Polypropylene composition according to claim 3, wherein said modified polypropylene is a polypropylene grafted with maleic acid, fumaric acid, (meth)acrylic acid, itaconic acid or cinnamic acid, or anhydrides, esters or salts thereof

9. Polypropylene composition comprising: 20-86% by total weight of the composition of a crystalline polypropylene-based matrix phase said matrix phase comprising polypropylene having a melt flow index as measured according to ISO 1133 at 230° C. and 2.16 kg of 2.0-100 g/10 min; 7-70% by total weight of the composition of an ethylene/α-olefin copolymer dispersed phase; 0.5-25% by total weight of the composition of a mineral filler selected from the group consisting of phyllosilicates, mica or wollastonite; and 0.2-4% by total weight of the composition of glass fibres having an average fibre diameter in the range of 5-30 μm.

10. Polypropylene composition according to claim 9, comprising: 22-68% by total weight of the composition of the crystalline polypropylene-based matrix phase; 12-48% by total weight of the composition of the ethylene/α-olefin copolymer dispersed phase; 1-20% by total weight of the composition of the mineral filler; and 0.5-3% by total weight of the composition of the glass fibres.

11. Polypropylene composition according to claim 1, wherein the glass fibres have an average fibre diameter of 10-25 μm; and/or wherein the glass fibres have an average fibre length before compounding of 1-10 mm; and/or wherein the glass fibres have an average fibre length after compounding of 0.05-0.9 mm.

12-19. (canceled)

20. Polypropylene composition according to claim 1, wherein the glass fibres have been treated with a coupling agent, wherein the coupling agent is selected from functional organosilanes, transition metal coupling agents, amino-containing Werner coupling agents and mixtures thereof.

21. (canceled)

22. Polypropylene composition according to claim 1, wherein the composition has a melt flow index as measured according to ISO 1133 using a 2.16 kg weight and at a temperature of 230° C. of 0.1-100 g/10 min.

23. (canceled)

24. Polypropylene composition according to claim 1, wherein the mineral filler is selected from the group consisting of mica, wollastonite, kaolinite, smectite, montmorillonite and talc.

25. Polypropylene composition according to claim 1, wherein said composition has a heat deflection temperature as measured according to ISO 75B of 105° C. or more.

26-27. (canceled)

28. Polypropylene composition according to claim 1, wherein said composition exhibits an average shrinkage measured according to ISO 294-4 on 65×65×3.2 mm injection moulded plaques of 1.05% or less.

29-30. (canceled)

31. Polypropylene composition according to claim 1, wherein said composition has a flexural strength as measured according to ISO 178 of 25 N/mm.sup.2 or more.

32-34. (canceled)

35. Three-dimensional article comprising a polypropylene composition according to claim 1.

36. Three-dimensional article according to claim 35 in the form of an automotive article.

37. (canceled)

Description

TEST METHODS

Melt Flow Index

[0074] The melt flow index was measured according to ISO 1133 with a load of 2.16 kg at 230° C.

Heat Deflection Temperature

[0075] Heat deflection temperature was measured according to ISO 75-2 (method B/045 MPa). Specimen of dimensions 80×10×4 mm were measured flatwise using injection moulded test speciments as described in EN ISO 1873-2 (80×10×4 mm).

Flexural Modulus

[0076] Flexural modulus was measured according to ISO 178 at 23° C., using injection moulded test specimens as described in EN ISO 1873-2 (80×10×4 mm).

Charpy Notched Impact Strength

[0077] Charpy notched impact strength was determined according to ISO 179-1eA:2000 on V-notched samples of 80×10×4 mm at 23° C. and −20° C.

[0078] The test specimens were prepared by injection moulding according to ISO 1873-2.

Density

[0079] Density was determined according to ISO 1183.

Shrinkage

[0080] Mould shrinkage, in the context of this invention called shrinkage, is the amount of contraction that a moulded part undergoes when it is removed from the mould cavity and cooled at room temperature. Shrinkage was measured according to ISO 294-4 on 65×65×3.2 mm injection moulded plaques after a conditioning time of 24 h after moulding at room temperature (23° C.) and 50% relative humidity. Each of the samples was moulded using the same conditions at the moulding machine. Shrinkage measured in the flow length and perpendicular to the flow is reported here. Following equation was used to determine shrinkage:

[00001]$\frac{L_m-L_s}{L_m}\times 100=\mathrm{shrinkage}.Math.\left[\%\right]$

wherein L.sub.m is the length of the mould in the considered direction, and L.sub.s is the length of the specimen in considered direction. A shrinkage in the flow direction, a shrinkage in the perpendicular direction to flow direction, as well as an average (arithmetic) of both shrinkage values is reported.

EXAMPLES

[0081] Polypropylene compositions as defined in table 1 were prepared by blending the different ingredients listed in table 2 using the ingredients mentioned in table 1.

TABLE-US-00001 TABLE 1 Tradename Description Producer Polymer A C7100-50 Propylene polymer; Braskem MFI 50 dg/min Polymer B TI2600C Propylene polymer; Braskem MFI 60 dg/min Plastomer 1 Tafmer A- C.sub.2C.sub.4 impact modifier; Mitsui 0550S MFI 0.5 dg/min, density 860 kg/m.sup.3 Plastomer 2 Engage 8200 C.sub.2C.sub.8 impact modifier; Dow MFI 5 dg/min, density 870 kg/m.sup.3 Filler Luzenac HAR T84 Talcum with D10 of Luzenac HAR T84 about 10 μm NEG ECS03-480 ECS03 T-480 E-glass chopped NEG glass fibre strand 10 μm Irganox 1076 Irganox 1076 Antioxidant BASF Irganox B225 Irganox B225 Stabiliser BASF CA FDA Fusabond P613 Anhydride modified Dupont Fusabond polypropylene Stab NA-11 UH ADK STAB Nucleating agent Adeka NA-11UH (Palmerole) Crodamide ER Crodamide Slip agent Croda Chimassorb 944 Chimassorb Hindered amine light BASF 944 stabiliser Masterbatch Plasblak PE Masterbatch CABOT CMB 4884

TABLE-US-00002 TABLE 2 Sample 1 (wt. %) Sample 2 (wt. %) Polymer A 53.6 52.6 Polymer B 10 10 Plastomer 16 16 Filler 16 16 Irganox 1010 0.1 0.1 Irganox 1076 0.1 0.1 Irgafos 168 0.1 0.1 Exxelor PO 1020 0.2 0.2 NEG ECS glass fibre 1 Crodamide EBSH 0.1 0.1 Crodamide ER 0.6 0.6 Chimasorb 944 0.2 0.2 Masterbatch CMB 3 3 Total 100 100

TABLE-US-00003 TABLE 3 Sample 1 Sample 2 (wt. %) (wt. %) Flexural ISO 178 (T = 23° C., II), 7 days 1934 1977 [N/mm.sup.2] Flexural strength [N/mm.sup.2] 33.1 33.7 Tensile ISO 527-1A (T = 23° C., II), 7 days 1803 1858 [N/mm.sup.2] HDT B ISO 75-b [° C.] 108.3 115.1 Shrinkage 3D measurement ISO 294-4 Average shrinkage after 24 hrs at 23° C. [%] 0.97 0.86 Shrinkage parallel to flow after 24 hrs at 23° C. 0.9 0.83 [%] Shrinkage perpendicular to flow after 24 hrs at 1.03 0.89 23° C. [%]

TABLE-US-00004 TABLE 4 Sample 3 Sample 4 Sample 5 Sample 6 Sample 7 Sample 8 (wt. %) (wt. %) (wt. %) (wt. %) (wt. %) (wt. %) Polymer A 30 30 30 30 30 30 Polymer B 37.95 37.85 37.75 37.65 35.65 35.75 Plastomer 1 12 12 12 12 14 14 Plastomer 2 6 6 6 6 6 6 Filler Luzenac HAR T84 11 10 9 8 8 9 NEG ECS03-480 glass fibre 1 2 3 3 2 Irganox 1076 0.1 0.1 0.1 0.1 0.1 0.1 Irganox B225 0.2 0.2 0.2 0.2 0.2 0.2 CA FDA Fusabond 0.1 0.2 0.3 0.3 0.2 Stab NA-11 UH 0.15 0.15 0.15 0.15 0.15 0.15 Crodamide ER 0.5 0.5 0.5 0.5 0.5 0.5 Chimasorb 944 0.1 0.1 0.1 0.1 0.1 0.1 Masterbatch CMB 2 2 2 2 2 2 Total 100 100 100 100 100 100

TABLE-US-00005 TABLE 5 Sample 3 Sample 4 Sample 5 Sample 6 Sample 7 Sample 8 (wt. %) (wt. %) (wt. %) (wt. %) (wt. %) (wt. %) HDT B ISO 75-B [° C.] 88.9 114.1 106.6 117.2 121.3 118.8 Shrinkage 3D measurement ISO 294-4 Average shrinkage after 24 hrs 0.87 0.74 0.73 0.72 0.55 0.62 at 23° C. [%] Shrinkage parallel to flow after 0.76 0.59 0.58 0.54 0.36 0.44 24 hrs at 23° C. [%] Shrinkage perpendicular to flow 0.99 0.89 0.88 0.89 0.75 0.80 after 24 hrs at 23° C. [%]