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Heterophasic propylene copolymers

A technology of copolymer and polypropylene composition, applied in the field of heterophasic propylene copolymer composition, which can solve the problems of stiffness deterioration, increase of low crystallinity fraction, etc.

Active Publication Date: 2022-04-26
BASSELL POLIOLEFINE ITAL SRL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As an example, increasing the content of the low crystallinity fraction can improve the impact resistance of the composition, but on the other hand can worsen the stiffness
In addition, increasing the content of low crystallinity fractions or changing certain properties may involve equipment processability issues

Method used

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  • Heterophasic propylene copolymers
  • Heterophasic propylene copolymers
  • Heterophasic propylene copolymers

Examples

Experimental program
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preparation example Construction

[0048] The preparation of the solid catalyst component can be carried out according to several methods.

[0049] According to one method, the solid catalyst component can be obtained by making the formula Ti(OR) q-y x y Titanium compounds derived from the formula MgCl 2 Preparation by the reaction of magnesium chloride with adducts of pROH, where q is the valence of titanium and y is a number between 1 and q, preferably TiCl 4 , and wherein p is a number between 0.1 and 6, preferably 2 to 3.5, and R is a hydrocarbon group having 1 to 18 carbon atoms. The adduct is suitably prepared in spherical form by mixing alcohol and magnesium chloride, operating under stirring conditions at the melting temperature of the adduct (100-130° C.). The adduct is then mixed with an inert hydrocarbon immiscible with the adduct, thereby creating an emulsion which is rapidly quenched causing the adduct to solidify in the form of spherical particles. Examples of spherical adducts prepared accord...

Embodiment 1-4、 comparative example 5-7

[0102] A 4 liter steel autoclave equipped with a stirrer, pressure gauge, thermometer, catalyst feed system, monomer feed line and thermostatic jacket was purged with nitrogen flow at 70°C for one hour. Then, under the flow of propylene at 30°C, charged with 75ml of anhydrous hexane, 0.76g of AlEt 3 , a suspension of 76 mg of dicyclopentyldimethoxysilane (D donor) and about 7-14 mg of solid catalyst component. The autoclave was closed and then a certain amount of hydrogen (value reported in Table 2) was added. Finally, 1.2 kg of liquid propylene were added within 2 minutes under continuous stirring. The temperature was raised to 70° C. within 10-11 minutes, and polymerization was carried out at this temperature for the time reported in Table 2. At the end of this polymerization step, unreacted propylene was removed: during venting, the internal temperature was maintained at 55-65°C (by setting the jacket temperature at 70°C).

[0103] The gas phase reaction procedure was th...

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Abstract

A polypropylene composition comprising (percentages relative to the total A + B): A) from 60 to 90 wt% of a fraction insoluble in xylene at 25 DEG C comprising greater than 90 wt% propylene units, and B) from 10 to 40 wt% of a fraction soluble in xylene at 25 DEG C wherein the fraction comprises a copolymer of propylene and ethylene, the present invention relates to a propylene and ethylene copolymer comprising ethylene derived units in an average content of 30.0 wt% to 50.0 wt%, said fraction being characterized by the fact that, when subjected to GPC fractionation and continuous IR analysis to determine the ethylene content of the eluted fraction (GPC-IR analysis), the ethylene content is shown to increase as Mw increases for fractions with Mw higher than the average value.

Description

technical field [0001] The present invention relates to heterophasic propylene copolymer compositions having high impact resistance. Background technique [0002] Heterophasic propylene copolymer compositions are plastic materials used in a variety of applications, such as thin-walled packaging, household goods and automotive components, because of their combination of properties such as stiffness, impact strength and processability. The heterophasic propylene copolymer composition may comprise a xylene insoluble relatively high crystallinity propylene polymer fraction at 25°C and a xylene soluble relatively low crystallinity copolymer fraction at 25°C. The relatively high crystallinity fraction may be a propylene homopolymer, or a random propylene copolymer with a relatively low amount of olefin comonomer, characterized by a high isotacticity. The relatively low crystallinity fraction may be propylene copolymers, especially propylene-ethylene copolymers, having an ethylene...

Claims

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Application Information

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IPC IPC(8): C08L23/12C08L23/14C08F210/06C08F110/06
CPCC08L23/12C08L23/14C08F210/06C08F110/06C08L2207/02C08L2205/03C08L23/16C08F2/001C08F4/651C08F4/6557C08F4/6465C08F210/16C08F2500/12C08F2500/27C08F2500/30C08F2500/31C08F2500/35
Inventor F·皮艾默恩忒斯A·米格诺吉纳D·利果里G·莫里尼G·维塔勒
Owner BASSELL POLIOLEFINE ITAL SRL
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