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Polypropylene compositions

A polypropylene composition and propylene polymer technology, applied in the field of thermoforming products, can solve the problem that the overall balance of properties cannot be completely satisfied.

Active Publication Date: 2016-09-07
BASSELL POLIOLEFINE ITAL SRL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, given the high standards demanded by the market, the overall balance of performance is still not entirely satisfactory across the entire range of possible applications

Method used

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  • Polypropylene compositions
  • Polypropylene compositions
  • Polypropylene compositions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-7 and Embodiment 10C-12

[0098] Embodiment 1-7 and embodiment 10C-12C (comparative example)

[0099] Catalyst preparation and prepolymerization

[0100] The Ziegler-Natta catalyst component was prepared according to Example 5 of European Patent EP728769, lines 48-55. The catalyst components thus prepared were contacted with triethylaluminum (TEAL) and dicyclopentyldimethoxysilane (DCPMS) as external electron donor components at 12° C. for 24 minutes. The weight ratio between TEAL and solid catalyst component was 11, and the weight ratio between TEAL and DCPMS was 10. The catalyst system thus obtained was prepolymerized by keeping it suspended in liquid propylene at 20° C. for about 5 minutes before introducing it into the first polymerization reactor.

[0101] polymerization

[0102] A propylene homopolymer as component (a) is produced in the first reactor and an ethylene-propylene copolymer as component (b) is produced in the second reactor. Throughout the reaction, constant temperature and p...

Embodiment 8-9 and Embodiment 13C-17

[0105] Embodiment 8-9 and embodiment 13C-17C (comparative example)

Embodiment 1

[0106] The procedures described in Examples 1-7 and Examples 10C-12C are repeated, and the difference is that the Ziegler-Natta catalyst is prepared according to Example 1 of the international application WO2009 / 050045, only for the first temperature rise For example, the temperature is raised to 110°C instead of 100°C. Data on the characterization of the polymers obtained are shown in Table 1. Data on the physical-mechanical properties of the final polymer composition are shown in Table 2, obtained from measurements carried out on the polymer as extruded.

[0107] Table 1

[0108] Example

1

2

3

4

5

6

7

8

9

10C

11C

12C

13C

14C

15C

16C

17C

(a) C2 [wt%]

0

1.0

1.9

0

1.0

1.0

1.0

1.9

1.9

1.9

1.9

1.9

1.5

3.0

0

1.0

1.9

(b) C2 [wt%]

80

80

80

78

78

85

80

79

79

73

72

75

73

79

79

79

79

XSIV[dl / g]

1.0

...

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Abstract

The invention relates to a heterophasic polypropylene compositions comprising 78-85 % by weight of a propylene homopolymer or copolymer matrix with up to 2.0 % by weight of ethylene units, 15-22 % by weight of an elastomeric ethylene-propylene copolymer and a clarifying agent. The composition has an intrinsic viscosity of the xylene soluble fraction at room temperature of from 0.5 to 1.5 dl / g and a melt flow rate (230 DEG C, 2.16 kg) of 0.5 to 10 g / 10 min. The compositions of the present invention can be used to prepare sheets for thermoforming applications.

Description

technical field [0001] The present invention relates to polypropylene compositions comprising a heterophasic propylene polymer and a nucleating agent. The invention also relates to the sheets thus obtained, and to thermoformed articles obtained from such sheets. Background technique [0002] It has long been known that the impact resistance of polypropylene can be improved by adding ethylene-based elastomeric copolymers (typically ethylene-propylene copolymers), by mechanical mixing or by sequential polymerization. For example, in European patent applications 170255, 373660, 603723, 1135440, 2084223 and 2247424, heterophasic compositions comprising a matrix of crystalline polypropylene and a rubber phase formed from a vinyl elastomeric copolymer are described. [0003] The compositions exhibit good impact resistance and, in some cases, good optical properties. However, given the high standards demanded by the market, the overall balance of performance is still not entirely...

Claims

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Application Information

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IPC IPC(8): C08F2/00C08J5/18C08L23/12C08L23/10
CPCC08F210/06C08J5/18C08L23/10C08L2203/16C08L2203/30C08L2207/02C08L2314/02C08J2323/10C08J2323/12C08J2423/08C08K5/0083C08L23/16C08L23/12C08L23/08C08F210/16C08F2500/12C08F2500/17C08F2500/26C08F2/001C08L2205/02
Inventor 中岛武坂井和彦栗山稔丸山真范
Owner BASSELL POLIOLEFINE ITAL SRL
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