Polypropylene composition comprising glass fibers

Abstract

The invention relates to a composition comprising a) a propylene homopolymer and/or a propylene copolymer consisting of at least 70.0 wt % of propylene monomer units and at most 30.0 wt % of comonomer units selected from ethylene monomer units and ?-olefin monomer units having 4 to 10 carbon atoms, b) an optional ethylene-?-olefin copolymer, c) glass fibers and d) a reaction product of d1) a functionalized polypropylene and d2) a polyetheramine, wherein the total amount of a) and b) is 10.0 to 80.0 wt % or 20.0 to 80.0 wt % with respect to the total composition, the amount of c) is 5.0 to 50.0 wt % with respect to the total composition, the amount of d2) is at least 5.0 wt % with respect to the total composition and the weight ratio of d2) to d1) is at least 0.050.

Claims

1. A composition comprising a) a propylene homopolymer and/or a propylene copolymer consisting of at least 70.0 wt % of propylene monomer units and at most 30.0 wt % of comonomer units selected from ethylene monomer units and ?-olefin monomer units having 4 to 10 carbon atoms, b) an optional ethylene-?-olefin copolymer, c) glass fibers and d) a reaction product of d1) a functionalized polypropylene and d2) a polyetheramine, wherein the total amount of a) and b) is 10.0 to 80.0 wt % with respect to the total composition, the amount of c) is 5.0 to 50.0 wt % with respect to the total composition, the amount of d1) is greater than or equal to 39.39 wt % and less than or equal to 45 wt %, with respect to the total composition, the amount of d2) is at least 5 wt % with respect to the total composition and the weight ratio of d2) to d1) is 0.25 to 1.00, wherein the composition comprises a heterophasic propylene copolymer consisting of a1) a matrix and b1) a dispersed phase, wherein a) comprises a1) and b) comprises b1).

2. The composition according to claim 1, wherein d1) is an anhydride functionalized polypropylene.

3. The composition according to claim 1, wherein d) has one of the following formulas (i)-(iv): ##STR00004## wherein n is 5 to 50000 and m is 3 to 100, wherein R.sup.1?H and R.sup.2?H, R.sub.1?H and R.sup.2?CH.sub.3 or R.sup.1?CH.sub.3 and R.sup.2?CH.sub.3, and wherein X is selected from the group consisting ofOH, OCH.sub.3, CH.sub.2C(R.sup.1)HNH.sub.2.

4. The composition of claim 1, wherein the amount of d2) is at least 10.0 wt % with respect to the total composition.

5. The composition according to claim 1, wherein the amount of a1) is 60.0 to 95.0 wt % based on the total of a1) and b1) and the amount of b1) is 5.0 to 40.0 wt % based on the total of a1) and b1), the amount of ethylene monomer units in b1) is 10.0 to 70.0 wt %, and/or the heterophasic propylene copolymer has a melt flow index of 10.0 to 100.0 dg/min measured according to ISO1133 (2.16 kg/230? C.).

6. The composition according to claim 1, wherein the amount of b) with respect to the total of a) and b) is 10.0 to 40.0 wt %.

7. The composition according to claim 1, wherein the glass fibers are long glass fibers having an average length of at least 4.0 mm before being added to the composition.

8. The composition according to claim 1, wherein the amount of b) with respect to the total of a) and b) is 0 to 30.0 wt %.

9. The composition of claim 8, wherein the glass fibers are short glass fibers having an average length of less than 4.0 mm before being added to the composition.

10. A tailgate or a door handle comprising the composition according to claim 9.

11. The composition according to claim 9, wherein the amount of the glass fibers is at least 20.0 wt % with respect to the composition.

12. An automotive body part comprising the composition according to claim 9.

13. An automotive body part comprising the composition according to claim 1.

14. An instrumental panel carrier comprising the composition according to claim 1.

15. The composition according to claim 1, wherein d1) is maleic anhydride functionalized polypropylene.

16. The composition according to claim 1, wherein the amount of the glass fibers is at least 20.0 wt % with respect to the composition.

17. The composition according to claim 1, wherein the amount of d2) is 11.0 to 30.0 wt %, with respect to the total composition.

18. The composition according to claim 1, wherein the amount of b) with respect to the total of a) and b) is 0 wt %.

19. The composition according to claim 1, wherein the sum of a), b), c) and d) is at least 98.0 wt % of the total composition.

20. A process for adhering a first part to a second part, comprising the steps of: molding a first part from a first composition, wherein the first composition is the composition according to claim 1, and pressing the first part and the second part together with an adhesive inbetween.

21. The process according to claim 20, wherein the process does not comprise treating a surface of the first part by plasma or flame.

22. A composition comprising a) a propylene homopolymer and/or a propylene copolymer consisting of at least 70.0 wt % of propylene monomer units and at most 30.0 wt % of comonomer units selected from ethylene monomer units and ?-olefin monomer units having 4 to 10 carbon atoms, b) an ethylene-?-olefin copolymer, c) glass fibers and d) a reaction product of d1) a functionalized polypropylene and d2) a polyetheramine, wherein the total amount of a) and b) is 10.0 to 50.0 wt % with respect to the total composition, the amount of b) with respect to the total of a) and b) is 20.0 to 40.0 wt %, the amount of c) is 5.0 to 50.0 wt % with respect to the total composition, the amount of d1) is greater than or equal to 39.39 wt % and less than or equal to 45 wt %, with respect to the total composition, the amount of d2) is at least 5 wt % with respect to the total composition and the weight ratio of d2) to d1) is 0.25 to 1.00, wherein the composition comprises a heterophasic propylene copolymer consisting of a1) a matrix and b1) a dispersed phase, wherein a) comprises a1) and b) comprises b1). the sum of a), b), c) and d) is at least 98.0 wt % of the total composition.

23. The composition of claim 22, wherein a) further comprises a propylene homopolymer added as a separate component from the heterophasic propylene copolymer.

Description

EXAMPLES

Ex 3 to Ex 8

(1) A reaction product of PP-maleic anhydride and polyetheramine was prepared in a twin screw extruder by adding the PP-MA as granules in the throat of the extruder and the amine-PEG-amine Jeffamine D-2000) as a liquid downstream of the extruder and then thoroughly mixing/dispersing it into a homogenous pre-compound blend.

(2) This reaction product was dry blended with PP-LGF granules (comprising heteophasic propylene copolymer 1, propylene homopolymer 1 and glass fibers) and compounded in a twin screw extruder. The components of the composition are shown in Table 1. The compositions of the obtained compounds are shown in Table 2.

(3) After drying, the obtained compound was injection molded into lap shear test bars, glued to each other using 1K polyurethane glue and tested according to test method DIN EN 1465. Where indicated, the surfaces of the bars were cleaned with isopropanol, flamed and provided with a polyisocyanate primer.

CEx 1 and CEx

(4) The process was identical to Ex 3 to Ex 8 except that PP-MA was dry blended with PP-LGF granules instead of the reaction product of PP-MA and polyetheramine.

(5) TABLE-US-00001 heterophasic propylene matrix = propylene homopolymer (81 wt %), copolymer 1 dispersed phase = ethylene-propylene copolymer (19 wt %), TCC2 = 10 wt %, MFI = 70 dg/min (ISO1133, 2.16 kg/230? C.) propylene homopolymer 1 MFI = 15 dg/min (ISO1133, 2.16 kg/230? C.) glass fibers 1 diameter 19 ?m (LGF SE4220) functionalized polypropylene grafted with maleic anhydride polypropylene 1 (Exxelor 1020) polyetheramine 1 diamine (Jeffamine D-2000)

(6) TABLE-US-00002 TABLE 2 CEx 1 CEx 2 Ex 3 Ex 4 Ex 5 Ex 6 Ex 7 Ex 8 heteophasic propylene 76.46 76.46 38.23 38.23 38.23 38.23 38.23 38.23 copolymer 1 propylene homopolymer 1 0.13 0.13 0.07 0.07 0.07 0.07 0.07 0.07 glass fibers 1 20.1 20.1 10.05 10.05 10.05 10.05 10.05 10.05 functionalized polypropylene 1 1 1 39.39 39.39 39.39 43.69 43.69 43.69 polyetheramine 0 0 11.1 11.1 11.1 6.8 6.8 6.8 additives 2.31 2.31 1.16 1.16 1.16 1.16 1.16 1.16 Total 100 100 100 100 100 100 100 100 Ratio Jeff/PP-MA 0 0 0.28 0.28 0.28 0.16 0.16 0.16 Rubber content 14.5 14.5 7.3 7.3 7.3 7.3 7.3 7.3 IPA wash Y Y N Y N N Y N surface treatment N Y N N Y N N Y Lap shear test DIN EN 1465 0.46 5.28 2.36 3.25 4.23 0.73 1.58 3.53 initial (no ageing) [MPa] type of failure AF SCF SCF/AF SCF/AF CF/SCF AF AF CF/SCF AF = adhesive type of failure SCF = cohesive type of failure

(7) It can be understood that the reaction product of PP-maleic anhydride and polyetheramine improves the bonding strength.

(8) Further, each of the IPA wash and the surface treatment results in an increase in the bonding strength.

(9) Further, a higher ratio of polyetheramine to PP-maleic anhydride results in an increase in the bonding strength.