KR101770487B1

KR101770487B1 - Pp compounds with alleviated or eliminated tiger stripe and retained excellent mechanical properties

Info

Publication number: KR101770487B1
Application number: KR1020157015859A
Authority: KR
Inventors: 지앙레이 주; 지안동 장; 시 핑 천
Original assignee: 보르쥬 컴파운딩 상하이 캄파니 리미티드
Priority date: 2012-11-30
Filing date: 2012-11-30
Publication date: 2017-08-22
Also published as: JP2015537087A; JP6143876B2; CN104837904A; EP2925811A1; KR20150086319A; WO2014082188A1; EP2925811A4; IN2015DN03994A; CN104837904B

Abstract

The use of the polypropylene composition (PP), the use of the polypropylene composition (PP) for the production of molded articles as well as articles comprising the polypropylene composition (PP) and the use of the polypropylene composition PP) is provided.

Description

[0001] PP COMPOUNDS WITH ALLEVIATED OR ELIMINATED TIGER STRIPE AND RETAINED EXCELLENT MECHANICAL PROPERTIES [0002]

The present invention relates to the use of the polypropylene composition (PP), the article comprising the polypropylene composition (PP) as well as the polypropylene composition for the production of molded articles and to reduce the tiger stripe on the article surface To the use of the polypropylene composition (PP).

Today, polypropylene is the polymer of choice for automotive parts such as bumpers, door panels, dashboards or door cladding. In particular, heterophasic propylene copolymers are suitable because they combine stiffness and good impact behavior. Heterophobic propylene copolymers are well known in the art and comprise a matrix of polypropylene homopolymers or random polypropylene copolymers in which the elastomeric copolymer is dispersed. Thus, the polypropylene matrix contains (finely) dispersed inclusions that are not part of the matrix, and the inclusions contain an elastomer. The term inclusion indicates that the matrix and inclusions form a different phase in the heterophasic propylene copolymer and the inclusion is visible, for example, by high resolution microscopy, such as electron microscopy or scanning electron microscopy.

Although commercially available polypropylene achieves a very good balance between stiffness and impact properties, the overall profile requirements for such systems are becoming increasingly burdensome. For example, polypropylene is typically injection molded into the desired articles such as automotive and household articles. However, because of the relatively large size of articles such as, for example, automotive bumpers, door panels, dashboards or door cladding, optical irregularities are often caused by the long, essential flow path of the polypropylene resin.

Such surface defects, also known as tiger stripes, flow marks or flow lines, appear as a series of alternating high and low gloss strips perpendicular to the melt flow direction during injection molding Thereby deteriorating the surface appearance.

In this regard, there have been many attempts to avoid such surface deficiencies, while maintaining a good balance of other physical properties, for example DE 19754061. However, it has been found that the occurrence of the tiger stripe can not be sufficiently prevented or the mechanical properties of the polymer composition are unsatisfactory.

Thus, there remains a need in the art to further reduce the occurrence of tiger stripes. In addition, there is a need to maintain mechanical properties such as impact / stiffness behavior at a very high level as well as to reduce the occurrence of Tiger stripes.

It is therefore an object of the present invention to provide a polypropylene composition which does not exhibit any tiger stripe on the surface of an article made therefrom, or which exhibits only a small tiger stripe. In addition, it is an object of the present invention to provide a polypropylene composition which not only does not exhibit a Tiger stripe but also maintains mechanical properties such as excellent balanced stiffness / impact behavior.

These and other objects are solved by the subject matter of the present invention.

A specific discovery of the present invention is to provide a polypropylene composition (PP) comprising a combination of two heterophasic propylene copolymers differing in melt flow index MFR ₂ and present in a particular amount.

According to a first aspect of the present invention,

a) a first heterophasic propylene copolymer (HPP1) having a 20.0 to 80.0 g / 10 min of melt flow index _{MFR 2 (230 ℃, 2.16 ㎏} ), and

b) a second heterophasic propylene copolymer (HPP2) having a melt flow index _{MFR 2 (230 ℃, 2.16 ㎏} ) of 0.05 to 2.0 g / 10 min

Wherein the polypropylene composition (PP)

i) The amount of the first heterophasic propylene copolymer (HPP1) is from 66.6 to 95.2 wt-%, based on the total weight of the first heterophasic propylene copolymer (HPP1) and the second heterophasic propylene copolymer (HPP2) Range,

ii) The amount of the second heterophasic propylene copolymer (HPP2) is in the range of 4.8 to 33.4 wt-%, based on the total weight of the first heterophasic propylene copolymer (HPP1) and the second heterophasic propylene copolymer (HPP2) Range

A polypropylene composition (PP) is provided.

Surprisingly, it has been found that the polypropylene composition (PP) according to the present invention does not exhibit any tiger stripe on the surface of the article made therefrom or only shows little tiger stripe. In addition, the components of the polypropylene composition (PP) according to the invention not only do not exhibit a Tiger stripe, but also have significant mechanical properties, such as stiffness and impact behavior, similar to prior art products.

For purposes of the present invention, it will be appreciated that the following terms have the following meanings:

The expression "heterophasic" indicates that the elastomeric copolymer is (finely) dispersed in the matrix. In other words, the elastomeric propylene copolymer forms inclusions in the matrix. Thus, the matrix contains (finely dispersed) inclusions that are not part of the matrix, and the inclusions contain an elastomeric propylene copolymer. The term " inclusions " according to the present invention preferably indicates that the matrix and inclusions form a different phase in the heterophasic propylene copolymer and the inclusions may be subjected to, for example, high resolution microscopic observations such as electron microscopy or main microscopy Lt; / RTI >

The final composition will likely have a complex structure. For example, the matrix of the heterophasic propylene copolymer may form a continuous or discontinuous phase, wherein the elastomeric copolymer and optional additives are a matrix of a composition that together or separately form dispersions therein.

According to another aspect of the present invention, there is provided an article comprising, and preferably consisting of, the polypropylene composition (PP). Preferably the article is a molded article, preferably an injection molded article. A further aspect of the invention relates to the use of said polypropylene composition (PP) for the production of molded articles, preferably injection molded articles. A further aspect of the invention relates to the use of said polypropylene composition (PP) to reduce tiger stripe on the article surface in the manufacture of articles.

When referring to preferred embodiments or technical details of the polypropylene composition (PP) of the present invention in the following, these preferred embodiments or technical details also refer to the articles of the present invention comprising a polypropylene composition (PP) It should be understood that the use of the polypropylene composition (PP) of the present invention for the manufacture of articles and the use of the polypropylene composition (PP) of the present invention to reduce the Tiger stripe on the article surface in articles.

According to one embodiment of the invention, the first heterophasic propylene copolymer (HPP1) is a) 20.0 to 75.0 g / 10 min melt flow index _{MFR 2 (230 ℃, 2.16 ㎏} ), and / or b) a (XCS) fraction (25 占 폚) of from 15.0 to 25.0 wt .-%, and / or c) the first heteropolymer of propylene copolymer (HPC1), based on the total weight of the heterophasic propylene copolymer An amorphous (AM) phase having an intrinsic viscosity (IV) of 2.0 to 3.0 dl / g, and / or e) an ethylene content of less than 15.0 wt .-%, based on the total weight of the polypropylene 1 amorphous (AM) phase having an ethylene content of 33.0 to 40.0 wt .-%, based on the total weight of the amorphous (AM) phase of the polypropylene-1 heterophasic propylene copolymer (HPP1).

According to another embodiment of the present invention, the second heterophasic propylene copolymer (HPP2) comprises a) a melt flow index MFR ₂ (230 占 폚, 2.16 kg) of from 0.1 to 2.0 g / 10 min, and / or b) (XCF) fractions (at 25 占 폚) of from 9.0 to 20.0 wt .-%, and / or c) a second heterophasic propylene copolymer (at 25 占 폚), based on the total weight of the heterophasic propylene copolymer An amorphous (AM) phase having an intrinsic viscosity (IV) of from 3.0 to 4.0 dl / g, and / or e) an ethylene content of from 3.0 to 8.0 wt.%, Has an amorphous (AM) phase with an ethylene content of 30.0 to 37.0 wt .-%, based on the total weight of the amorphous (AM) phase of the second heterophasic propylene copolymer (HPP2).

According to another embodiment of the present invention, the first heterophasic propylene copolymer (HPP1) comprises a polypropylene homopolymer matrix (PM1) and an elastomeric propylene copolymer (AM1) dispersed in the matrix (PM1) Or the second heterophasic propylene copolymer (HPP2) comprises a polypropylene homopolymer matrix (PM2) and an elastomeric propylene copolymer (AM2) dispersed in the matrix (PM2). Preferably, the polypropylene homopolymer matrix (PM1) of the first heterophasic propylene copolymer (HPP1) a) 30.0 to 250.0 g / 10 min of melt flow index _{MFR 2 (230 ℃, 2.16 ㎏} ), and / or b (XC) fractions (25 DEG C) of 0.8 to 3.0 wt-%, based on the total weight of the polypropylene homopolymer matrix (PM1) of the first heterophasic propylene copolymer (HPP1). Also preferably, the second hetero polypropylene homopolymer matrix (PM2) of the propylene copolymer (HPP2) is a) 0.1 to 3.0 g / 10 min melt flow index MFR ₂ (230 ℃ of, 2.16 ㎏), and / or b) a fraction of xylene low temperature solubles (XCS) (at 25 占 폚) of less than 2.0 wt.%, based on the total weight of the polypropylene homopolymer matrix (PM2) of the second heterophasic propylene copolymer (HPP2).

According to one embodiment of the invention, the polypropylene composition (PP) comprises 40.0 to 60.0 wt .-% of the first heteropolypropylene copolymer (HPP1), based on the total weight of the polypropylene composition (PP) Based on the total weight of the polypropylene composition (PP), 3.0-20.0 wt .-% of the second heterophasic propylene copolymer (HPP2), 5.0-20.0 wt. % Of an elastomeric ethylene copolymer (EE) having an ethylene unit content of at least 50.0 wt .-%, based on the total weight of the elastomeric ethylene copolymer (EE), of an elastomeric ethylene copolymer (EE) Based on the total weight of the composition (PP), from 5.0 to 10.0 wt.% Of high-density polyethylene (HDPE) and from 15.0 to 25.0 wt .-% of inorganic filler F). Compositions containing EE, HDPE, and F may exhibit excellent mechanical properties, such as excellent balanced stiffness / impact behavior, without exhibiting a Tiger stripe.

According to another embodiment of the invention, the elastomeric ethylene copolymer (EE) comprises a) comonomer units selected from ethylene units and C ₄ to C ₁₂ ? -Olefins and / or b) elastomeric ethylene copolymers C) a melt flow index MFR ₁ (190 ° C, 2.16 kg) of from 0.25 to 30.0 g / 10 min, based on the total weight of the melt (EE) .

According to another embodiment of the present invention, the high density polyethylene (HDPE) has a melt flow index MFR ₁ (190 캜, 2.16 ㎏) of 0.2 to 15.0 g / 10 min and / or a density of 930 kg / m 3 or more.

According to one embodiment of the invention, the inorganic filler (F) is selected from the group consisting of talc, mica, calcium carbonate, diatomaceous earth, wollastonite and kaolin and / or has an average particle size d ₅₀ .

According to another embodiment of the present invention, the polypropylene composition (PP) has a flexural modulus of at least 1500 MPa and / or b) an isodod impact strength of greater than 30 kJ / strength (23 DEG C).

According to another embodiment of the present invention, the first heterophasic propylene copolymer (HPP1) and / or the second heterophasic propylene copolymer (HPP2) are α-nucleated, The heterophasic propylene copolymer (HPP1) and the second heterophasic propylene copolymer (HPP2) are α-nucleated.

The present invention will be described in more detail below.

The polypropylene composition (PP) according to the present invention comprises a first heterophasic propylene copolymer (HPP1) and a second heterophasic propylene copolymer (HPP2). In addition, the first heterophasic propylene copolymer (HPP1) is 20.0 to 80.0 g / 10 min of melt flow index _{MFR 2 (230 ℃, 2.16 ㎏} ) , measured according to ISO 1133 and has a second heterophasic propylene copolymer ( HPP2) has a melt flow index _{MFR 2 (230 ℃, 2.16 ㎏} ) , measured according to ISO 1133 of from 0.05 to 2.0 g / 10 min. In addition, the amount of the first heterophasic propylene copolymer (HPP1), based on the total weight of the first heterophasic propylene copolymer (HPP1) and the second heterophasic propylene copolymer (HPP2), is from 66.6 to 95.2 wt-% And the amount of the second heterophasic propylene copolymer (HPP2) ranges from 4.8 to 33.4 wt.%.

In one embodiment of the invention, the polypropylene composition (PP) preferably has a high stiffness, i.e. a flexural modulus of at least 1,500 MPa, preferably 1,500 to 2,700 MPa, more preferably 1,600 to 2,600 MPa . For example, the polypropylene composition (PP) of the present invention has a flexural modulus of from 1,700 to 2,500 MPa, such as 1,720 to 2,500 MPa.

In one embodiment of the invention, the polypropylene composition (PP) has a tensile strength of greater than 15 MPa, more preferably greater than 17 MPa, and most preferably greater than 17 to 30 MPa.

Additionally or alternatively, the impact strength will also be significantly higher. Therefore, it is recognized that the polypropylene composition (PP) is characterized by an Izod notched impact strength (+23 DEG C) of preferably not less than 30 kJ / m2, more preferably not less than 40 kJ / m2. For example, the polypropylene composition (PP) has an Izod Notched impact strength (+23 DEG C), preferably in the range of 40 to 60 kJ / m < 2 >

It is recognized that the polypropylene composition (PP) preferably has a flexural modulus of at least 1500 MPa, and / or an Izod notched impact strength (+23 DEG C) of more than 30 kJ / m 2. In one embodiment of the present invention, the polypropylene composition (PP) has a flexural modulus of at least 1500 MPa and an Izod notched impact strength (+23 DEG C) of more than 30 kJ / m < 2 >.

The polypropylene composition (PP) is defined in particular by the first heterophasic propylene copolymer (HPP1) and the second heterophasic propylene copolymer (HPP2).

Thus, all components are now defined in more detail.

The first heterophasic propylene copolymer (HPP1) is preferably a heterophasic system wherein the polypropylene homopolymer matrix (PM1) as defined herein constitutes a matrix and the elastomeric propylene copolymer (AM1) is dispersed in the matrix to be.

Thus, the first heterophasic propylene copolymer (HPP1), which is part of the polypropylene composition (PP), contains comonomers in addition to propylene. Preferably, the first heterophasic propylene copolymer (HPP1) which is part of the polypropylene composition (PP) comprises ethylene and / or C ₄ to C ₁₂ alpha-olefins in addition to propylene. Thus, the term < RTI ID = 0.0 > first heterophasic propylene copolymer (HPP1)

(a) Propylene

And

(b) ethylene and / or C ₄ to C ₁₂ ? -olefin

, Preferably consisting of, units derived from the polypropylene.

Thus, the first heterophasic propylene copolymer (HPP1) according to the invention, i.e. the first heterophasic propylene copolymer (HPP1) which is part of the polypropylene composition (PP), is a copolymer of propylene with a monomer copolymerizable with propylene, And / or C ₄ to C ₁₂ alpha-olefins, in particular ethylene and / or C ₄ to C ₈ alpha-olefins, for example 1-butene and / or 1-hexene. Preferably, the first heterophasic propylene copolymer (HPP1) according to the present invention comprises, especially consists of, a monomer copolymerizable with propylene from the group consisting of ethylene, 1-butene and 1-hexene. More specifically, the first heterophasic propylene copolymer (HPP1) of the present invention comprises units derivable from ethylene and / or 1-butene in addition to -propylene. In a preferred embodiment, the first heterophasic propylene copolymer (HPP1) according to the present invention comprises only units derivable from propylene and ethylene. Even more preferably, only the elastomeric propylene copolymer (AM1) contains an ethylene comonomer.

It is therefore recognized that the elastomeric propylene copolymer (AM1) dispersed in the polypropylene homopolymer matrix (PM1) comprises comonomer units selected from propylene monomer units and ethylene and / or C ₄ to C ₁₂ ? -Olefins. For example, an elastomeric propylene copolymer (AM1) dispersed in a polypropylene homopolymer matrix (PM1) comprises propylene monomer units and ethylene comonomer units.

Thus, the elastomeric propylene copolymer (AM1) is preferably an ethylene propylene rubber (EPR), while the matrix in which the elastomeric propylene copolymer (AM1) is dispersed is a polypropylene homopolymer matrix (PM1).

The first heterophasic propylene copolymer (HPP1) which is part of the polypropylene composition (PP) is preferably less than 15.0 wt.%, Preferably less than 15.0 wt.%, Based on the total weight of the first heterophasic propylene copolymer (HPP1) Is understood to have a comonomer content, preferably an ethylene content, of less than 12.0 wt .-%, more preferably 3.0 to 10.0 wt .-%, most preferably 5.0 to 10.0 wt .-%.

The fraction (23 DEG C) of xylene low temperature solubles (XC) of the first heterophasic propylene copolymer (HPP1) which is part of the polypropylene composition (PP) preferably contains the total weight of the first heterophasic propylene copolymer (HPP1) %, Preferably from 18.0 to 22.0 wt .-%, most preferably from 18.0 to 20 wt .-%, based on the total weight of the composition.

Additionally or alternatively, the first heterophasic propylene copolymer (HPP1) which is part of the polypropylene composition (PP) has a melt index of from 20.0 to 80.0 g / 10 min, preferably from 20.0 to 75.0 g / 10 min, 20.0 to 60.0 g / 10 min, most preferably from 30.0 to 50.0 g / 10 min of melt flow index _{MFR 2 (230 ℃, 2.16 ㎏} ) has a. For example, the part first heterophasic propylene copolymer (HPP1) is 30.0 to 40.0 g / 10 min or 35.0 to 40.0 g / 10 min melt flow index MFR ₂ (230 ℃ of the polypropylene composition (PP), 2.16 ㎏ ).

The polypropylene homopolymer matrix (PM1) which is part of the first heterophasic propylene copolymer (HPP1) is a propylene homopolymer. In other words, the comonomer content of the polypropylene homopolymer matrix (PM1) is 0.5 wt .-% or less, more preferably 0.3 wt .-% or less, and most preferably 0.1 wt .-% or less. The weight percentages are based on the total weight of the polypropylene homopolymer matrix (PM1).

In other words, the expression polypropylene homopolymer or polypropylene homopolymer matrix (PM1) used in the entirety of the present invention relates to polypropylene consisting essentially of 99.5 wt.% Or more propylene units. In a preferred embodiment, only propylene units are detectable in the polypropylene homopolymer.

In addition, it is recognized that the fraction of xylene low temperature solubles (XCS) in the polypropylene homopolymer matrix (PM1) which is part of the first heterophasic propylene copolymer (HPP1) is considerably low. Thus, the xylene low temperature solubles (XCS) fraction (25 占 폚) of the polypropylene homopolymer matrix (PM1), based on the total weight of the polypropylene homopolymer matrix (PM1) of the first heterophasic propylene copolymer (HPP1) , Preferably 0.8 to 3.0 wt .-%, more preferably 1.0 to 3.0 wt .-%, most preferably 1.3 to 2.5 wt .-%. For example, the xylene low temperature solubles (XCS) fraction (25 占 폚) of the polypropylene homopolymer matrix (PM1) is the fraction of the polypropylene homopolymer matrix (PM1) of the first heterophasic propylene copolymer Based on the total weight of the composition, 1.4 to 2.3 wt .-%.

Additionally or alternatively, the polypropylene homopolymer matrix (PM1) which is part of the first heterophasic propylene copolymer (HPP1) has a significantly higher melt flow index. Therefore, preferably the polypropylene homopolymer matrix (PM1) has a weight average molecular weight of 30.0 to 250.0 g / 10 min, preferably 40.0 to 160.0 g / 10 min, more preferably 80.0 to 120.0 g / 10 min, even more preferably 90.0 to 110.0 g / 10 min, most preferably from 95.0 to 105.0 g / 10 min of melt flow index _{MFR 2 (230 ℃, 2.16 ㎏} ) has a.

A further essential component of the first heterophasic propylene copolymer (HPP1) which is part of the polypropylene composition (PP) is an elastomeric propylene copolymer (AM1) dispersed in a polypropylene homopolymer matrix (PM1).

Reference is made to the information provided for the first heterophasic propylene copolymer (HPP1) with respect to the comonomer used in the elastomeric propylene copolymer (AM1). Thus, the elastomeric propylene copolymer (AM1) is a copolymer of propylene with monomers copolymerizable with propylene, such as comonomers such as ethylene and / or C ₄ to C ₁₂ alpha-olefins, especially ethylene and / or C ₄ to C ₈ alpha-olefins, For example 1-butene and / or 1-hexene. Preferably, the elastomeric propylene copolymer (AM1) comprises, especially consists of, a monomer copolymerizable with propylene from the group consisting of ethylene, 1-butene and 1-hexene. More specifically, the elastomeric propylene copolymer (AM1) comprises units derivable from ethylene and / or 1-butene in addition to -propylene. Thus, in a particularly preferred embodiment, the elastomeric propylene copolymer (AM1) comprises only units derivable from propylene and ethylene.

Since the major amount of elastomeric propylene copolymer (AM1) is soluble in xylene at ambient temperature (XCS content; ie, xylene low temperature solubles content), the XCS content of the first heterophasic polypropylene composition (HPP1) AM1, i.e. the amount of amorphous phase, but it is not necessarily exactly the same. For example, the elastomeric propylene copolymer (AM1) may also include a portion with a very high ethylene concentration, which portion is crystalline and therefore insoluble in cold xylene.

According to one embodiment of the invention, the first heterophasic propylene copolymer (HPP1) which is part of the polypropylene composition (PP) has an intrinsic viscosity (IV) of 2.0 to 3.0 dl / g, preferably 2.0 to 2.7 dl / g Lt; / RTI > phase with an amorphous (AM) phase.

The comonomer content, preferably the ethylene content, in the elastomeric propylene copolymer (AM1) is relatively low. Thus, in one embodiment, the comonomer content, more preferably the ethylene content, of the amorphous fraction of the first heterophasic propylene copolymer (HPP1) is greater than the sum of the amorphous (AM) total of the first heterophasic propylene copolymer %, Preferably from 33.0 to 38.0 wt .-%, most preferably from 34.0 to 38.0 wt .-%, based on the weight of the composition.

Alternatively, the first heterophasic propylene copolymer (HPP1) is 20.0 to 80.0 g / 10 propylene having a melt flow index _{MFR 2 (230 ℃, 2.16 ㎏} ) of min homopolymer or a random propylene copolymer or block propylene copolymer to be.

The polypropylene homopolymer matrix (PM2), also defined herein as the first heterophasic propylene copolymer (HPP1) and also the second heterophasic propylene copolymer (HPP2), constitutes a matrix, and the elastomeric propylene copolymer Is a heterophasic system in which AM2 is dispersed.

Thus, the second heterophasic propylene copolymer (HPP2) which is part of the polypropylene composition (PP) contains comonomers in addition to propylene. Preferably, the second heterophasic propylene copolymer (HPP2) which is part of the polypropylene composition (PP) comprises ethylene and / or C ₄ to C ₁₂ alpha-olefins in addition to propylene. Thus, the term second heterophasic propylene copolymer (HPP2) according to the present invention comprises

(a) Propylene

And

(b) ethylene and / or C ₄ to C ₁₂ ? -olefin

, Preferably consisting of, units derived from the polypropylene.

Thus, the second heterophasic propylene copolymer (HPP2) according to the invention, i.e. the second heterophasic propylene copolymer (HPP2) which is part of the polypropylene composition (PP), is a copolymer of propylene with a monomer copolymerizable with propylene, And / or C ₄ to C ₁₂ alpha-olefins, in particular ethylene and / or C ₄ to C ₈ alpha-olefins, for example 1-butene and / or 1-hexene. Preferably, the second heterophasic propylene copolymer (HPP2) according to the present invention comprises, especially consists of, a monomer copolymerizable with propylene from the group consisting of ethylene, 1-butene and 1-hexene. More specifically, the second heterophasic propylene copolymer (HPP2) of the present invention comprises units derivable from ethylene and / or 1-butene in addition to -propylene. In a preferred embodiment, the second heterophasic propylene copolymer (HPP2) according to the present invention comprises only units derivable from ethylene and propylene. Even more preferably, only the elastomeric propylene copolymer (AM2) contains an ethylene comonomer.

It is therefore recognized that the elastomeric propylene copolymer (AM2) dispersed in the polypropylene homopolymer matrix (PM2) comprises comonomer units selected from propylene monomer units and ethylene and / or C ₄ to C ₁₂ ? -Olefins. For example, an elastomeric propylene copolymer (AM2) dispersed in a polypropylene homopolymer matrix (PM2) comprises propylene monomer units and ethylene comonomer units.

Thus, the elastomeric propylene copolymer (AM2) is preferably an ethylene propylene elastomer, while the matrix in which the elastomeric propylene copolymer (AM2) is dispersed is a polypropylene homopolymer matrix (PM2).

The second heterophasic propylene copolymer (HPP2) which is part of the polypropylene composition (PP) preferably comprises from 3.0 to 8.0 wt.%, Based on the total weight of the second heterophasic propylene copolymer (HPP2) Is understood to have a comonomer content, preferably an ethylene content, of from 3.0 to 7.0 wt .-%, more preferably from 4.0 to 6.0 wt .-%, and most preferably from 4.1 to 5.1 wt .-%.

In one embodiment of the present invention, the second heterophasic propylene copolymer (HPP2) is present in an amount of from 9.0 to 20.0 wt.%, Preferably from 10.0 to 20.0 wt.%, Based on the total weight of the second heterophasic propylene copolymer (HPP2) To 15.0 wt .-%, most preferably from 12.0 to 14.0 wt .-% of the xylene fraction at low temperature (XCS) (25 ° C).

Additionally or alternatively, the second heterophasic propylene copolymer (HPP2), which is part of the polypropylene composition (PP), is present in an amount of 0.05 to 2.0 g / 10 min, preferably 0.1 to 2.0 g / 10 min, 0.2 to 1.0 g / 10 min, most preferably 0.2 to 0.5 g / 10 min of melt flow index _{MFR 2 (230 ℃, 2.16 ㎏} ) has a. For example, and has a polypropylene composition (PP), which is part the second heterophasic propylene copolymer (HPP2) has a melt flow index _{MFR 2 (230 ℃, 2.16 ㎏} ) of 0.2 to 0.3 g / 10 min of.

Thus, one specific requirement of the present invention is that the melt flow index MFR ₂ of the first heterophasic propylene copolymer (HPP 1) is greater than the melt flow index MFR ₂ (230 ° C, 2.16 kg) of the second heterophasic propylene copolymer (HPP2) . Has in one embodiment of the present invention, the polypropylene composition (PP) a first heterophasic propylene copolymer (HPP1) is 20.0 to 80.0 g / 10 min melt flow index _{MFR 2 (230 ℃, 2.16 ㎏} ) of, poly second heterophasic propylene copolymer (HPP2) of the polypropylene composition (PP) has a melt flow index _{MFR 2 (230 ℃, 2.16 ㎏} ) of 0.05 to 2.0 g / 10 min. For example, the polypropylene composition (PP) a first heterophasic propylene copolymer (HPP1) is 20.0 to 75.0 g / 10 min melt flow index _{MFR 2 (230 ℃, 2.16 ㎏} ) has a polypropylene composition (PP ) of the second heterophasic propylene copolymer (HPP2) has a melt flow index _{MFR 2 (230 ℃, 2.16 ㎏} ) of 0.2 to 0.5 g / 10 min.

The polypropylene homopolymer matrix (PM2) which is part of the second heterophasic propylene copolymer (HPP2) is a propylene homopolymer. In other words, the comonomer content of the polypropylene homopolymer matrix (PM2) is 0.5 wt-% or less, more preferably 0.3 wt-% or less, and most preferably 0.1 wt-% or less. The weight percentages are based on the total weight of the polypropylene homopolymer matrix (PM2).

In other words, the expressed polypropylene homopolymer or polypropylene homopolymer matrix (PM2) used in the entirety of the present invention relates to polypropylene consisting essentially of 99.5 wt.% Or more propylene units. In a preferred embodiment, only propylene units are detectable in the polypropylene homopolymer.

In addition, it is recognized that the fraction of xylene low temperature solubles (XCS) in the polypropylene homopolymer matrix (PM2) which is part of the second heterophasic propylene copolymer (HPP2) is considerably low. Thus, the xylene low temperature solubles (XCS) fraction (25 占 폚) of the polypropylene homopolymer matrix (PM2) was determined based on the total weight of the polypropylene homopolymer matrix (PM2) of the second heterophasic propylene copolymer (HPP2) , Less than 2.0 wt .-%, preferably 0.1 to 2.0 wt .-%, more preferably 0.5 to 2.0 wt .-%. For example, the fraction of the xylene low temperature solubles (XCS) fraction (25 ° C) of the polypropylene homopolymer matrix (PM2) is the total weight of the polypropylene homopolymer matrix (PM2) of the second heterophasic propylene copolymer (HPP2) On the basis of 1.0 to 2.0 wt .-%.

Additionally or alternatively, the polypropylene homopolymer matrix (PM2) which is part of the second heterophasic propylene copolymer (HPP2) also has a significantly lower melt flow index. Accordingly, preferably the polypropylene homopolymer matrix (PM2) is used in an amount of 0.1 to 3.0 g / 10 min, preferably 0.1 to 2.0 g / 10 min, more preferably 0.1 to 1.0 g / 10 min, And a melt flow index MFR ₂ (230 ° C, 2.16 kg) of 0.5 g / 10 min.

A further essential component of the second heterophasic propylene copolymer (HPP2) which is part of the polypropylene composition (PP) is an elastomeric propylene copolymer (AM2) dispersed in a polypropylene homopolymer matrix (PM2).

Reference is made to the information provided for the second heterophasic propylene copolymer (HPP2) with respect to the comonomer used in the elastomeric propylene copolymer (AM2). Thus, the elastomeric propylene copolymer (AM2) is a copolymer of propylene with a copolymerizable monomer such as comonomers such as ethylene and / or C ₄ to C ₁₂ alpha-olefins, especially ethylene and / or C ₄ to C ₈ alpha-olefins, For example 1-butene and / or 1-hexene. Preferably, the elastomeric propylene copolymer (AM2) comprises, especially consists of, a monomer copolymerizable with propylene from the group consisting of ethylene, 1-butene and 1-hexene. More specifically, the elastomeric propylene copolymer (AM2) comprises units derivable from ethylene and / or 1-butene in addition to -propylene. Thus, in a particularly preferred embodiment, the elastomeric propylene copolymer (AM2) comprises only units derivable from propylene and ethylene.

According to one embodiment of the present invention, the second heterophasic propylene copolymer (HPP2) which is part of the polypropylene composition (PP) has an intrinsic viscosity (IV) of 3.0 to 4.0 dl / g, preferably 3.5 to 4.0 dl / g Lt; RTI ID = 0.0 > (AM) < / RTI >

In one embodiment of the invention, the comonomer content, more preferably the ethylene content, of the second heterophasic propylene copolymer (HPP2) on the amorphous (AM) phase is greater than the amorphous (OH) content of the second heterophasic propylene copolymer %, Preferably 30.0 to 35.0 wt .-%, based on the total weight of the composition.

As stated above, one requirement of the present invention is that the first heterophasic propylene copolymer (HPP1) and the second heterophasic propylene copolymer (HPP2), which are part of the polypropylene composition (PP), are provided in specific amounts.

The polypropylene composition (PP) of the present invention is characterized in that the polypropylene composition (PP) is present in an amount ranging from 66.6 to 95.2 wt.%, Based on the total weight of the first heterophasic propylene copolymer (HPP1) and the second heterophasic propylene copolymer A first heterophasic propylene copolymer (HPP1) and a second heterophasic propylene copolymer (HPP2) in an amount ranging from 4.8 to 33.4 wt.%.

For example, the polypropylene composition (PP) may comprise from 70.0 to 95.0 wt .-%, based on the total weight of the first heterophasic propylene copolymer (HPP1) and the second heterophasic propylene copolymer (HPP2) A first heterophasic propylene copolymer (HPP1) and a second heterophasic propylene copolymer (HPP2) in an amount of 5.0 to 30.0 wt .-%. Alternatively, the polypropylene composition (PP) may have an amount of from 80.0 to 95.0 wt .-%, based on the total weight of the first heterophasic propylene copolymer (HPP1) and the second heterophasic propylene copolymer (HPP2) A first heterophasic propylene copolymer (HPP1) and a second heterophasic propylene copolymer (HPP2) in an amount of 5.0 to 20.0 wt .-%. In one embodiment of the present invention, the polypropylene composition (PP) comprises 85.0 to 95.0 wt.%, Based on the total weight of the first heterophasic propylene copolymer (HPP1) and the second heterophasic propylene copolymer (HPP2). % Of a first heterophasic propylene copolymer (HPP1) in an amount of, for example, 90.0 to 95.0 wt .-%, and a second heterophasic propylene (HPP1) in an amount of 5.0 to 15.0 wt.%, Such as 5.0 to 10.0 wt. Copolymer (HPP2).

Additionally or alternatively, the weight ratio [(HPP1) / (HPP2)] between the first heteropolypropylene copolymer (HPP1) and the second heteropolypropylene copolymer (HPP2) ranges from 20/1 to 2/1 , More preferably in the range of 15/1 to 3/1, and most preferably in the range of 12/1 to 3/1.

The polypropylene composition (PP) of the present invention may be further characterized as being capable of additionally containing typical additives such as acid scavengers, antioxidants, nucleating agents, light stabilizers, slip agents, and / do. Preferably, the amount of the additive excluding the inorganic filler will be not more than 7.0 wt.%, More preferably not more than 5.0 wt.%, Based on the total weight of the polypropylene composition (PP).

In one embodiment of the invention, the polypropylene composition (PP) comprises a first heterophasic propylene copolymer (HPP1) in an amount of from 40.0 to 60.0 wt.%, Based on the weight of the polypropylene composition (PP) And a second heterophasic propylene copolymer (HPP2) in an amount of 3.0 - 20.0 wt .-%. For example, the polypropylene composition (PP) may comprise a first heterophasic propylene copolymer (HPP1) in an amount of 45.0-55.0 wt .-% and a second heterophasic propylene copolymer (HPP1) in an amount of 3.0-15.0 wt.% Based on the weight of the polypropylene composition (PP). -% of a second heterophasic propylene copolymer (HPP2).

The polypropylene composition (PP) of the present invention further comprises an elastomeric ethylene copolymer (EE) followed by a first heterophasic propylene copolymer (HPP1) and a second heterophasic propylene copolymer (HPP2) to improve impact properties It is recognized that it can do. The elastomeric ethylene copolymer (EE) is an elastomeric elastomeric copolymer of the elastomeric propylene copolymer (AM1) and the second heteropolymer propylene copolymer (HPP2) of the first heterophasic propylene copolymer (HPP1) which is part of the polypropylene composition Propylene copolymer < RTI ID = 0.0 > (AM2). &Lt; / RTI >

The elastomeric ethylene copolymer (EE) comprises comonomer units selected from ethylene units and C ₄ to C ₁₂ ? -Olefins, especially comonomer units selected from ethylene units and C ₄ to C ₈ ? -Olefins, such as 1 Butene and / or 1-hexene and / or 1-octene. Preferably, the elastomeric ethylene copolymer (EE) comprises and consists of ethylene units and comonomer units selected from 1-butene, 1-hexene and 1-octene. More specifically, the elastomeric ethylene copolymer (EE) comprises units derivable from 1-butene and / or 1-octene in addition to -ethylene. Thus, in a particularly preferred embodiment, the elastomeric ethylene copolymer (EE) comprises only units derivable from ethylene and 1-octene.

The ethylene content in the elastomeric ethylene copolymer (EE) is relatively high. Thus, in a preferred embodiment, the ethylene content of the elastomeric ethylene copolymer (EE) which is part of the polypropylene composition (PP) is at least 50.0 wt .-% And preferably 50.0 to 75.0 wt .-%. For example, the ethylene content of the elastomeric ethylene copolymer (EE), which is part of the polypropylene composition (PP), is in the range of 60.0 to 70.0 wt-%, such as 65.0 To 70.0 wt .-%.

Additionally or alternatively, the elastomeric ethylene copolymer (EE) which is part of the polypropylene composition (PP) has a melt index of from 0.25 to 30.0 g / 10 min, preferably from 0.25 to 20.0 g / 10 min, more preferably from 0.25 to 20.0 g / 15.0 g / 10 min, and most preferably 0.25 to 10.0 g / 10 min, at a melt flow rate MFR ₁ (190 캜, 2.16 ㎏).

Thus, the elastomeric ethylene copolymer (EE) which is part of the polypropylene composition (PP) preferably has an ethylene content of at least 50.0 wt.%, And an ethylene content of from 0.25 to 30.0 percent, based on the total weight of the elastomeric ethylene copolymer ₁ -octene copolymer having a melt flow index MFR ₁ (190 캜, 2.16 kg) of 10 g / 10 min. For example, an elastomeric ethylene copolymer (EE) that is part of a polypropylene composition (PP) has an ethylene content of 65.0 to 70.0 wt .-% and an ethylene content of 0.25 to 70.0 wt.%, Based on the total weight of the elastomeric ethylene copolymer ₁ -octene copolymer having a melt flow index MFR ₁ of 10.0 g / 10 min (190 캜, 2.16 kg).

In one embodiment of the invention, the polypropylene composition (PP) comprises an elastomeric ethylene copolymer (EE) in an amount of 5.0 - 20.0 wt.%, Based on the total weight of the polypropylene composition (PP) do. For example, the polypropylene composition (PP) may comprise an amount of 5.0-15.0 wt .-%, based on the total weight of the polypropylene composition (PP), or an amount of elastomeric ethylene air in an amount of 5.0-10.0 wt .-% Coalescence (EE).

In order to improve the anti-scratch characteristics of the surface of the article formed from the polypropylene composition (PP) of the present invention, the polypropylene composition (PP) of the present invention comprises the first heteropolymer composition (HPP1), the second heteropolymer composition (HPP2) and optionally an elastomeric ethylene copolymer (EE) followed by high density polyethylene (HDPE). The high density polyethylene (HDPE) is an elastomeric propylene copolymer of an elastomeric propylene copolymer (AM1) and a second heteropolymer propylene copolymer (HPP2) of a first heterophasic propylene copolymer (HPP1) which is part of a polypropylene composition (PP) (Chemically) different from the random elastomeric ethylene copolymer (AM2) and the optional elastomeric ethylene copolymer (EE).

High density polyethylene (HDPE) used in accordance with the present invention is well known in the art and is commercially available.

The high density polyethylene (HDPE) preferably has a density of 0.2 to 15.0 g / 10 min, preferably 0.5 to 10.0 g / 10 min, more preferably 1.0 to 10.0 g / 10 min, most preferably 5.0 to 10.0 g / min, a melt flow index MFR ₁ (190 캜, 2.16 kg).

High density polyethylene (HDPE) typically has a density of at least 930 kg / m 3, preferably 930 to 970 kg / m 3, more preferably 930 to 950 kg / m 3.

In one embodiment of the present invention, the polypropylene composition (PP) comprises high density polyethylene (HDPE) in an amount of 5.0-10.0 wt.%, Based on the total weight of the polypropylene composition (PP). For example, the polypropylene composition (PP) comprises high density polyethylene (HDPE) in an amount of 5-8 wt-% based on the total weight of the polypropylene composition (PP).

To reach the desired level of rigidity, the polypropylene composition (PP) of the present invention preferably comprises a selected amount of an inorganic filler (F). Therefore, the polypropylene composition (PP) according to the present invention preferably comprises an inorganic filler (F) in an amount of 15.0 - 25.0 wt.%, Based on the total weight of the polypropylene composition (PP). In one embodiment of the invention, the polypropylene composition (PP) according to the invention preferably comprises an inorganic filler in an amount of 15.0 - 20.0 wt.%, Based on the total weight of the polypropylene composition (PP) .

According to one embodiment of the present invention, the inorganic filler (F) is selected from the group consisting of talc, mica, calcium carbonate, diatomaceous earth, wollastonite and kaolin. For example, the inorganic filler (F) is talc.

In one embodiment of the invention, the inorganic filler (F) has an average particle size d ₅₀ .

For example, the polypropylene composition (PP) contains talc as an inorganic filler (F). According to one embodiment of the invention, the inorganic filler used in the polypropylene composition (PP) is talc having an average particle size d ₅₀ of 0.65 to 20 μm.

Therefore, the polypropylene composition (PP) of the present invention is preferably

a) a first heterophasic propylene copolymer (HPP1) in an amount of from 40.0 to 60.0 wt .-%, based on the total weight of the polypropylene composition (PP)

b) from 3.0 to 20.0 wt .-% of a second heterophasic propylene copolymer (HPP2), based on the total weight of the polypropylene composition (PP)

c) from 5.0 to 20.0 wt .-% of an elastomeric ethylene copolymer (EE) based on the total weight of the polypropylene composition (PP), based on the total weight of the elastomeric ethylene copolymer (EE) - an elastomeric ethylene copolymer (EE) having a content of ethylene units of at least%

d) from 5.0 to 10.0 wt .-% of high density polyethylene (HDPE), based on the total weight of the polypropylene composition (PP), and

e) from 15.0 to 25.0 wt.% of an inorganic filler (F), based on the total weight of the polypropylene composition (PP)

.

For example, the polypropylene composition (PP) of the present invention is preferably

a) a first heterophasic propylene copolymer (HPP1) in an amount of from 45.0 to 55.0 wt .-%, based on the total weight of the polypropylene composition (PP)

b) from 3.0 to 15.0 wt .-% of a second heterophasic propylene copolymer (HPP2), based on the total weight of the polypropylene composition (PP)

c) from 5.0 to 15.0 wt .-% of an elastomeric ethylene copolymer (EE) based on the total weight of the polypropylene composition (PP), based on the total weight of the elastomeric ethylene copolymer (EE) - an elastomeric ethylene copolymer (EE) having a content of ethylene units of at least%

d) from 5.0 to 8.0 wt.% of high density polyethylene (HDPE), based on the total weight of the polypropylene composition (PP), and

e) 15.0 - 20.0 wt.% of an inorganic filler (F) based on the total weight of the polypropylene composition (PP)

.

The polypropylene composition (PP) of the present invention can be selected from the group consisting of acid scavengers, antioxidants, nucleating agents, light stabilizers, UV stabilizers, slip agents, anti-scratch agents Lt; RTI ID = 0.0 > additive < / RTI > For example, the polypropylene composition (PP) further comprises additives such as antioxidants, UV stabilizers, anti-scratch agents (e.g., organosilicon), dispersants, and colorants. Preferably, the amount of these additives excluding the inorganic filler (F) in the polypropylene composition (PP) of the present invention is 14.0 wt.% Or less, for example, 11.0 wt.% Or less based on the total weight of the polypropylene composition (PP) %. In one embodiment of the present invention, the polypropylene composition (PP) is a polypropylene composition (PP) comprising as an additive an antioxidant, a UV stabilizer, an anti-scratch agent (e.g., organosilicon), a dispersant, Based on the weight, in an amount of 3.0 to 11.0 wt .-%, preferably 3.0 to 8.0 wt .-%.

A preferred anti-scratch agent is organosilicon. For example, the polypropylene composition (PP) may contain up to 3.0 wt.%, Preferably 1.0 to 2.0 wt.%, Of an anti-scratch agent, such as organosilicon, based on the total weight of the polypropylene composition (PP) , More preferably in an amount of about 1.0 wt .-%.

The polypropylene composition (PP) of the present invention preferably contains an a-nucleating agent. Even more preferably, the polypropylene composition (PP) of the present invention does not contain a β-nucleating agent. According to the present invention, the nucleating agent is understood as a nucleating agent different from the inorganic filler (F). Thus, the nucleating agent is preferably selected from the group consisting of:

(i) salts of monocarboxylic acids and polycarboxylic acids, such as sodium benzoate or aluminum tert-butylbenzoate, and

(ii) dibenzylidene sorbitol (e.g., 1,3: 2,4 dibenzylidene sorbitol) and C ₁ -C ₈ -alkyl-substituted dibenzylidene sorbitol derivatives such as methyl dibenzylidene sorbitol, ethyl dibenzyl (E.g., 1,3: 2,4 di (methylbenzylidene) sorbitol), or substituted nonyltol derivatives such as 1,2,3, -tridecoxy-4, 6: 5,7-bis-O - [(4-propylphenyl) methylene] -nonitol, and

(iii) a salt of a diester of phosphoric acid, for example sodium 2,2'-methylenebis (4, 6, -di-tert-butylphenyl) phosphate or aluminum- Bis (4,6-di-t-butylphenyl) phosphate], and

(iv) a vinylcycloalkane polymer and a vinylalkane polymer (discussed above), and

(v) their mixture.

Such additives are generally commercially available and are described, for example, in Hans Zweifel's "Plastic Additives Handbook ", 5th edition, 2001.

Most preferably, the alpha -nucleating agent is part of (and thus of the polypropylene composition (PP)) of the first heterophasic propylene copolymer (HPP1) and / or the second heterophasic propylene copolymer (HPP2). Therefore, the α-nucleating agent content of the heterophasic propylene copolymer (HPP1) and / or the heterophasic propylene copolymer (HPP2) (and thus of the polypropylene composition (PP)) is preferably not more than 5.0 wt .-%. In a preferred embodiment, the heterophasic propylene copolymer (HPP1) and / or the heterophasic propylene copolymer (HPP2) (and thus the polypropylene composition (PP)) contain up to 3000 ppm, more preferably from 1 to 2000 ppm, Dibenzylidene sorbitol (for example, 1,3: 2,4 dibenzylidene sorbitol), dibenzylidene sorbitol derivatives, preferably dimethyl dibenzylidene sorbitol (for example, 1,3: 2,4 di (4-propylphenyl) methylene] -nonitol, such as 1,2,3-trideoxy-4,6: 5,7-bis- Nucleating agents selected from the group consisting of vinylcycloalkane polymers, vinylalkane polymers, and mixtures thereof.

In a preferred embodiment, the heterophasic propylene copolymer (HPP1) and / or the heterophasic propylene copolymer (HPP2) (and thus the polypropylene composition (PP)) comprise vinylcycloalkanes such as vinylcyclohexane (VCH) Vinylalkane polymer as an alpha-nucleating agent. Preferably, in this embodiment, the heterophasic propylene copolymer (HPP1) and the heterophasic propylene copolymer (HPP2) comprise a vinylcycloalkane such as vinylcyclohexane (VCH), a polymer and / or a vinylalkane polymer, Hexane (VCH). The vinylcycloalkane is preferably vinylcyclohexane (VCH) introduced into the heterophasic propylene copolymer (HPP1) and / or the heterophasic propylene copolymer (HPP2) (and thus into the polypropylene composition (PP) Lt; / RTI > More preferably, in this preferred embodiment, vinylcycloalkanes such as vinylcyclohexane (VCH), polymers and / or vinylalkane polymers in the heterophasic propylene copolymer (HPP1), more preferably vinylcyclohexane (VCH) polymers (VCH) in the heterophasic propylene copolymer (HPP2), a polymer and / or a vinylcyclohexane (VCH) in the heterophasic propylene copolymer (HPP2) is less than or equal to 500 ppm, more preferably between 1 and 200 ppm, and most preferably between 5 and 100 ppm. The amount of the vinylalkane polymer, more preferably vinylcyclohexane (VCH) polymer is 500 ppm or less, more preferably 1 to 200 ppm, and most preferably 5 to 100 ppm. Therefore, the polypropylene composition (PP) preferably contains not more than 500 ppm, more preferably 1 to 200 ppm, and most preferably 5 to 100 ppm.

See International applications WO 99/24478, WO 99/24479 and especially WO 00/68315 in connection with BNT-technology. According to this technique, the catalyst system, preferably a Ziegler-Natta catalyst, is reacted in the presence of a catalyst system, in particular a special Ziegler-Natta catalyst, an external donor and a cocatalyst,

CH ₂ = CH-CHR ³ R ⁴

Wherein R ³ and R ⁴ together may form a 5- or 6-membered saturated, unsaturated or aromatic ring or independently represent an alkyl group of 1 to 4 carbon atoms, The modified catalyst is a heterophasic polypropylene composition according to the invention, i.e. a heterophasic propylene copolymer (HPP1) and / or a heterophasic propylene copolymer (HPP2), most preferably a heterophasic propylene copolymer (HPP1) and a heterophasic Propylene copolymer (HPP2). The polymerized vinyl compound functions as a-nucleating agent. The weight ratio of the vinyl compound to the solid catalyst component in the reforming step of the catalyst is preferably not more than 5 (5: 1), preferably not more than 3 (3: 1) and most preferably 0.5 (1: : 1). The most preferred vinyl compound is vinylcyclohexane (VCH).

According to another aspect of the present invention, a polypropylene composition (PP) comprises a first heterophasic propylene copolymer (HPP1) and a second heterophasic propylene copolymer (HPP2), an optional elastomeric ethylene copolymer (EE) (HDPE), optional inorganic filler (F) and further optional additives are blended in an extruder and the resulting first heterophasic propylene copolymer (HPP1), second heterophasic propylene copolymer (HPP2) and optional elastomeric Extruding a blend of ethylene copolymer (EE), high density polyethylene (HDPE), inorganic filler (F) and further additives in an extruder. The term "blending " in accordance with the present invention refers to a blend of two or more different, already present materials, namely a first heterophasic propylene copolymer (HPP1), a second heterophasic propylene copolymer (HPP2) and an optional elastomeric ethylene copolymer (EE) , High density polyethylene (HDPE), inorganic filler (F) and further additives.

The individual components of the composition of the present invention, namely the first heterophasic propylene copolymer (HPP1) and the second heterophasic propylene copolymer (HPP2) and optionally the elastomeric ethylene copolymer (EE), the high density polyethylene (HDPE) Such as a Banbury mixer, a 2-roll rubber mill, a Buss-kneader, and the like, to blend additional additives, co-kneader or twin screw extruder may be used. The polymer material recovered from the extruder is typically in pellet form. These pellets are then further processed, preferably by injection molding, for example, to produce articles and articles of the composition of the present invention.

The residence time in the blending equipment or the axial velocity of the extruder should be chosen to achieve a sufficiently high degree of homogenization.

All components used in the preparation of the polypropylene composition (PP) of the present invention are known and commercially available. Thus, their manufacture is also well known. For example, the first heterophasic propylene copolymer (HPP1) and the second heterophasic propylene copolymer (HPP2) according to the present invention are preferably produced independently of one another by a sequential polymerization process, a multistep process known in the art , Wherein the corresponding matrices (polypropylene homopolymer matrix (PM1) and polypropylene homopolymer matrix (PM2)) are produced independently of one another in one or more slurry reactors and subsequently in an elastomeric copolymer (elastomeric propylene copolymer AM1) and elastomeric propylene copolymer (AM2)) are produced independently from each other in one or more, i.e. one or two, gas phase reactor (s).

More precisely, a polypropylene homopolymer matrix (PM1) is produced in one or more reactor systems, the system comprising one or more reactors, and the polypropylene homopolymer matrix (PM1) in a subsequent reactor system Reactor) to produce an elastomeric propylene copolymer (AM1) in the presence of the polypropylene homopolymer matrix (PM1) in the subsequent reactor system to obtain a first heteropolymer (HPP1).

Additionally or alternatively, a polypropylene homopolymer matrix (PM2) can be produced in one or more reactor systems (which include one or more reactors) and the polypropylene homopolymer matrix (PM2) in a subsequent reactor system (AM2) in the presence of a polypropylene homopolymer matrix (PM2) in the subsequent reactor system to form a second heterophasic propylene copolymer (HPP2 ) Is obtained.

Thus, each polymerization system may comprise one or more conventional stirred slurry reactors and / or one or more gas phase reactors. Preferably, the reactors used are selected from the group of loop and gas phase reactors, and in particular, the process utilizes one or more loop reactors and one or more gas phase reactors. It is also possible to use several reactors of each type, for example one loop and two or three gas phase reactors, or two loops and one or two gas phase reactors in succession.

Preferably, the process for the production of the first heterophasic propylene copolymer (HPP1) and / or the second heterophasic propylene copolymer (HPP2) is carried out in the presence of a Ziegler-Natta catalyst, external donor and cocatalyst, But also prepolymerization by the selected catalyst system.

In a preferred embodiment, the prepolymerization is carried out as bulk slurry polymerization in liquid propylene, i.e. the liquid phase mainly comprises propylene, a small amount of other reactants and optionally inert components dissolved therein.

The prepolymerization reaction is typically carried out at a temperature of from 0 to 50 캜, preferably from 10 to 45 캜, more preferably from 15 to 40 캜.

The pressure in the prepolymerization reactor is not critical but must be high enough to maintain the reaction mixture in a liquid phase. Thus, the pressure can be from 20 to 100 bar, for example from 30 to 70 bar.

The catalyst components are preferably all introduced into the prepolymerization step. However, in the case where the solid catalyst component (i) and the cocatalyst (ii) can be supplied separately, it is possible that only the co-catalyst part is introduced into the prepolymerization step and the remaining part is introduced into the subsequent polymerization step. In such a case, it is also essential that a large amount of promoter is introduced so that a sufficient polymerization reaction takes place in the prepolymerization step.

It is also possible to add other components to the prepolymerization step. Thus, hydrogen can be added to the prepolymerization step to control the molecular weight of the prepolymer, which is known in the art. In addition, antistatic additives may be used to prevent particles from adhering to one another or to the reactor wall.

Precise control of the prepolymerization conditions and reaction parameters is within the ordinary skill in the art.

The slurry reactor represents any reactor working with bulk or slurry, such as a continuous or simple batch stirred tank reactor or loop reactor, in which the polymer is formed into a particulate form. "Bulk" means polymerization in a reaction medium comprising 60.0 wt .-% or more of monomers. According to a preferred embodiment, the slurry reactor comprises a bulk loop reactor.

"Gaseous phase reactor" means any mechanical mixing or fluidized bed reactor. Preferably, the gas phase reactor comprises a mechanical shaking fluidized bed reactor with a gas velocity of at least 0.2 m / sec.

Particularly preferred embodiments for the production of the first heterophasic propylene copolymer (HPP1) and / or the second heterophasic propylene copolymer (HPP2) of the present invention are a combination of one loop and one or two gas phase reactors or Comprising performing a polymerization with a process comprising a combination of two loops and one or two gas phase reactors.

A preferred multistage process is a slurry-gas phase process known, for example, as Borstar ^® technology developed by Borealis. In this regard, reference is made to EP 0 887 379 A1, WO 92/12182, WO 2004/000899, WO 2004/111095, WO 99/24478, WO 99/24479 and WO 00/68315. Which is incorporated herein by reference.

A further suitable slurry-gas phase process is Basell's Spheripol ^® process.

Preferably, the first heterophasic propylene copolymer (HPP1) and / or the second heterophasic propylene copolymer (HPP2) according to the present invention is preferably a Spheripol ^® or Borstar ^® -PP process, As well as special Ziegler-Natta catalysts in combination with special external donors.

Thus, one preferred multi-step process can include the following steps:

(Ii) a special Ziegler-Natta catalyst (i), an external donor (iii) and a cocatalyst (ii) in a first slurry reactor and optionally a second slurry reactor, wherein the two slurry reactors use the same polymerization conditions. Producing a polypropylene matrix in the presence of a selected catalyst system, for example described in detail below,

Transferring the slurry reactor product into at least one first gas phase reactor, such as one gas phase reactor or continuously connected first and second gas phase reactors,

- producing an elastomeric copolymer in the presence of a polypropylene matrix and in the presence of a catalyst system in said at least first gas phase reactor,

Recovering the polymer product for further processing.

For the above-mentioned preferred slurry-gas phase processes, the following general information regarding process conditions may be provided.

The temperature is preferably 40 to 110 占 폚, preferably 50 to 100 占 폚, especially 60 to 90 占 폚, the pressure is 20 to 80 bar, preferably 30 to 60 bar, Hydrogen is added in a known manner.

The reaction product of the slurry polymerization, preferably carried out in a loop reactor, is then transferred to the subsequent gas phase reactor (s), wherein the temperature in the subsequent gas phase reactor (s) is preferably from 50 to 130 캜, 60 to 100 DEG C, the pressure is 5 to 50 bar, preferably 8 to 35 bar, and hydrogen is added in a manner known per se to optionally control the molecular weight.

The average residence time may be different in the reactor zones described above. In one embodiment, the average residence time in the slurry reactor, for example a loop reactor, is from 0.5 to 5 hours, for example from 0.5 to 2 hours, and the average residence time in the gas phase reactor is generally from 1 to 8 hours will be.

If desired, the polymerization can be carried out in a known manner in a slurry under supercritical conditions, preferably in a loop reactor, and / or in a gaseous reactor as a condensation mode.

According to the present invention, the heterophasic polypropylene is preferably produced by a multistage polymerization process as described above, in the presence of a catalyst system comprising as component (i) a Ziegler-Natta catalyst which contains the transesterification products of lower alcohols and phthalic esters .

The precursor catalyst used according to the invention is prepared by the following steps:

a) reacting the spray crystallization or emulsion solidification product of MgCl ₂ and C ₁ -C ₂ alcohol with TiCl ₄ ,

b) reacting the product of step a) with a compound of formula (I)

Wherein R ^{1 '} and R ^2' are independently at least C ₅ alkyl,

Reacting a dialkyl phthalate of formula (I) with a C ₁ to C ₂ alcohol and a dialkyl phthalate of formula (I) under conditions which cause transesterification reaction to form an internal donor,

c) washing the product of step b) or

d) optionally step c) additionally comprising TiCl ₄ and the reaction product of.

Precursor catalysts are produced, for example, as defined in patent applications WO 87/07620, WO 92/19653, WO 92/19658 and EP 0 491 566. The contents of these documents are incorporated herein by reference.

First, an adduct of MgCl ₂ and C ₁ -C ₂ alcohol of the formula MgCl ₂ * nROH wherein R is methyl or ethyl and n is 1 to 6 is formed. Preferably, ethanol is used as the alcohol.

The adduct, which is first melted and then spray crystallized or emulsion solidified, is used as the catalyst carrier.

In the next step, a spray crystallization or emulsion solidified adduct of the formula MgCl ₂ * nROH wherein R is methyl or ethyl, preferably ethyl, and n is 1 to 6, is contacted with TiCl ₄ to form a titanated support , Followed by the following steps:

The above titanated carrier

(i) a dialkyl phthalate of formula (I) wherein R ^{1 '} and R ^2' are independently at least C ₅ -alkyl, such as at least C ₈ -alkyl,

Or preferably

(ii) dialkyl phthalates of formula (I) wherein R ^{1 '} and R ^2' are the same and are at least C ₅ -alkyl, such as at least C ₈ -alkyl,

Or more preferably

(iii) a dialkyl phthalate of formula (I) selected from the group consisting of propylhexyl phthalate (PrHP), dioctyl phthalate (DOP), di-iso-decyl phthalate (DIDP), and ditridecyl phthalate More preferably dialkyl phthalate (DOP), such as di-iso-octyl phthalate or diethylhexyl phthalate, especially diethylhexyl phthalate, of formula (I)

To form a first product,

The first product is applied to a suitable transesterification reaction condition, i.e. a temperature of more than 100 ° C, preferably 100 to 150 ° C, more preferably 130 to 150 ° C, and the methanol or ethanol is reacted with the compound of formula (I) (II), preferably at least 80 mol-%, more preferably at least 90 mol-% and most preferably at least 95 mol-% of the ester group of the dialkyl phthalate,

Wherein R ¹ and R ² are methyl or ethyl, preferably ethyl,

To form a dialkyl phthalate, wherein the dialkyl phthalate of formula (II) is an internal donor, and

- recovering said transesterification reaction product as a precursor catalyst composition (component (i)).

[And wherein, R is methyl or ethyl, n is 1-6 Im] formula MgCl ₂ * nROH In a preferred embodiment the adduct is melted, and then the melt is preferably a gas into a cooled solvent or a cooled gas , The adduct crystallizes in a morphologically favorable form, as described, for example, in WO 87/07620.

These crystallized adducts are preferably used as catalyst supports and are reacted with precursor catalysts useful in the present invention, as described in WO 92/19658 and WO 92/19653.

As the catalyst residue was removed by extraction, an adduct of titanated carrier and internal donor was obtained wherein the group derived from the ester alcohol was changed.

If enough titanium remains in the carrier, it will act as the active component of the precursor catalyst.

If not, titanation is repeated after the treatment to ensure sufficient titanium concentration and thus activity.

Preferably, the precursor catalyst used according to the invention contains less than or equal to 2.5 wt.%, Preferably less than or equal to 2.2 wt.%, More preferably less than or equal to 2.0 wt.% Titanium. Its donor content is preferably from 4 to 12 wt .-%, more preferably from 6 to 10 wt .-%.

More preferably, the precursor catalyst used in accordance with the present invention is prepared by using ethanol as the alcohol and dioctyl phthalate (DOP) as the dialkyl phthalate of formula (I) to produce diethyl phthalate (DEP) as the internal donor compound .

Even more preferably, the catalyst used according to the invention is the catalyst described in the Example section; Especially dioctyl phthalate as dialkyl phthalate of formula (I) according to WO 92/19658.

In a further embodiment, the Ziegler-Natta catalyst is of the formula:

CH ₂ = CH-CHR ³ R ⁴

[Wherein, R ³ and R ⁴ together form a 5- or 6-membered saturated, unsaturated or aromatic ring or independently represent an alkyl group having 1 to 4 carbon atoms] with a special Ziegler-Natta catalyst , An external donor and a cocatalyst, and the modified catalyst is used in the preparation of the heterophasic polypropylene composition according to the present invention. The polymerized vinyl compound functions as a-nucleating agent. This modification is particularly used in the production of the heterophasic polypropylene (H-PP1).

With regard to the modification of catalysts, reference is made to international applications WO 99/24478, WO 99/24479 and in particular to WO 00/68315, which are incorporated herein by reference in their entireties as well as reaction conditions for the modification of catalysts, as well as for polymerization reactions.

During the production of the heterophasic polypropylene according to the invention, the catalyst system used preferably comprises, as component (ii), an organometallic cocatalyst in addition to a special Ziegler-Natta catalyst.

It is therefore preferred to select cocatalysts from the group consisting of alkyl aluminum, such as triethyl aluminum (TEA), dialkylaluminum chloride and alkyl aluminum sesquichloride.

Component (iii) of the catalyst system used is an external donor represented by the formula (IIIa) or (IIIb). The formula (IIIa)

Si (OCH ₃ ) ₂ R ₂ ⁵ (IIIa)

, Wherein R ⁵ is a branched-alkyl group having 3 to 12 carbon atoms, preferably a branched-alkyl group having 3 to 6 carbon atoms, or a cycloalkyl having 4 to 12 carbon atoms, Cycloalkyl < / RTI > of 5 to 8 carbon atoms.

Particularly preferably R ⁵ is selected from the group consisting of iso-propyl, iso-butyl, iso-pentyl, tert.-butyl, tert.-amyl, neopentyl, cyclopentyl, cyclohexyl, methylcyclopentyl and cycloheptyl .

The formula (IIIb)

_{Si (OCH 2 CH 3) 3} (NR x R y) (IIIb)

^Wherein R ^x and R ^y may be the same or different and represent a hydrocarbon group of 1 to 12 carbon atoms.

R ^x and R ^y are independently selected from the group consisting of a linear aliphatic hydrocarbon group having 1 to 12 carbon atoms, a branched aliphatic hydrocarbon group having 1 to 12 carbon atoms, and a cyclic aliphatic hydrocarbon group having 1 to 12 carbon atoms. Particularly preferably R ^x and R ^y are independently selected from the group consisting of methyl, ethyl, n-propyl, n-butyl, octyl, decanyl, iso-propyl, iso-butyl, iso-pentyl, tert.- , Neopentyl, cyclopentyl, cyclohexyl, methylcyclopentyl, and cycloheptyl.

More preferably R ^x and R ^y are both the same, and even more preferably R ^x and R ^y are both ethyl groups.

More preferably, the external donor of formula (IIIb) is diethylaminotriethoxysilane.

Most preferably the external donor has the formula (IIIa), for example, dicyclopentyl dimethoxy silane [Si (OCH ₃₎ ₂ (cyclo-pentyl) _2] or diisopropyl dimethoxy silane [Si (OCH ₃₎ ₂ ( _{CH (CH 3) 2) 2} ] a.

The polypropylene compositions of the present invention are suitable for a wide range of applications. In particular, it is recognized that the polypropylene compositions of the present invention retain mechanical properties such as excellent balanced stiffness / impact behavior without exhibiting a Tiger stripe.

In view of the very good results obtained for the polypropylene composition (PP) of the present invention, the polypropylene composition (PP) is particularly suitable for the production of molded articles. Accordingly, another aspect of the present invention relates to an article comprising a polypropylene composition (PP) as defined above.

For example, the article may contain a polypropylene composition (PP) in an amount of at least 60.0 wt .-%, more preferably at least 80.0 wt .-%, and most preferably at least 95.0 wt.%, Based on the total weight of the article . In one embodiment of the invention, the article consists of the polypropylene composition (PP) of the present invention.

Preferably the article is a molded article, preferably an injection molded article. Preferred examples of such injection molded articles are large parts for applications in the automotive or domestic industry. For example, the invention relates to automotive articles, in particular automotive interior and exterior, such as bumpers, body panels, spoilers, dashboards and / or door panels.

Accordingly, the present invention relates to a polypropylene composition (PP) of the invention, in particular comprising at least 60.0 wt.%, More preferably at least 80.0 wt .-%, even more preferably at least 95.0 wt. , Automotive articles, in particular automotive interior and exterior, such as bumpers, body panels, spoilers, dashboards, door panels, etc., especially bumpers and / or door panels.

Accordingly, a further aspect of the present invention relates to the use of a polypropylene composition (PP) as defined above for the production of molded articles. Preferably the polypropylene composition (PP) defined above is used in the production of injection molded articles.

A further aspect of the present invention is the use of a polypropylene composition (PP) as defined above for reducing tiger stripe on the surface of an article, preferably comprising, the polypropylene composition (PP) of the present invention .

The present invention will now be described in further detail by the examples provided below.

Example

The following definitions and measurement methods are applied to the following examples as well as the general description of the present invention, unless otherwise defined.

A. Definition / measurement method

Density is measured according to ISO 1183-1 - method (2004). Sample preparation is carried out by compression molding in accordance with ISO 1872-2: 2007.

The average particle size d50 (laser diffraction) is calculated from the particle size distribution (mass percent) identified by laser diffraction (Mastersizer) according to ISO 13320-1.

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

MFR ₁ (190 ° C) is measured according to ISO 1133 (190 ° C, 2.16 kg load).

Xylene Low Temperature Solubles (XCS, wt .-%) : The content of xylene low temperature solubles (XCS) is measured at 23 ° C in accordance with ISO 6427.

The amorphous content (AM) is determined by separating the xylene low-temperature solubles fraction (XCS) and precipitating the amorphous portion with acetone. The precipitate is filtered and dried in a vacuum oven at 90 < 0 > C.

AM% = (100 x m ₁ xv ₀ ) / (m ₀ xv ₁ )

[Wherein,

"AM%" is an amorphous fraction,

"m ₀ " is the initial polymer amount (g)

"m ₁ " is the weight (g) of the precipitate,

"v ₀ " is the initial volume (ml)

"v ₁ " is the volume (ml) of the sample to be analyzed]

The intrinsic viscosity is measured according to DIN ISO 1628/1 (Oct. 1999) (in decalin at 135 占 폚).

The tensile strength; The breaking tensile strain (or elongation at break) was measured using an injection molded specimen (dog bone shape, 4 mm thickness) as described in EN ISO 1873-2 using ISO 527-2 (crosshead speed = 50 mm / min; ).

The flexural modulus Point-bending according to ISO 178 for an injection molded specimen of 80 x 10 x 4 mm made according to ISO 294-1: 1996.

Izod notched impact strength is verified according to ISO 180 / 1A at 23 ° C using injection molded test specimens (80 x 10 x 4 mm) as described in EN ISO 1873-2.

The comonomer content , particularly the ethylene content, is determined by Fourier transform infrared spectroscopy (FTIR) with ¹³ C-NMR. When measuring the ethylene content in the polypropylene, a thin film of the sample (250 탆 in thickness) was prepared by hot-pressing. The absorption peaks at 720 and 733 cm < ^-1 > for the propylene-ethylene copolymer were measured with a Perkin Elmer FTIR 1600 spectrometer. Propene-1-butene-copolymer was evaluated at 767 cm ^-1 . The method was corrected by the ethylene content data measured by ¹³ C-NMR. "IR-Spektroskopie fur Anwender "; WILEY-VCH, 1997 and "Validierung in der Analytik", WILEY-VCH, 1997.

Tiger Stripe: The tendency to exhibit the tiger stripe is the size of 356 (L) x 70 (W) x 2 (T) mm produced by injection molding an extruded compound at an injection speed of 30 mm / s using an injection molding machine Is visually evaluated against the black sheet. The tiger stripe on the surface of the black sheet is visually confirmed under a light source of 40 W fluorescent lamp. "Removed" refers to a sheet having no tiger stripe on the entire sheet surface under test conditions. "Significant" means that a tiger stripe appears on the surface of the test sheet under test conditions. "Not significant" means the occurrence of a mild yet significant Tiger stripe on the surface of the test sheet under test conditions.

B. Example

Polymers (HPP1a), (HPP1b), (HPP1c), (HPP1d) and (HPP2) were produced in a Borstar test plant with a prepolymerization reactor, a slurry loop reactor and two gas phase reactors. The matrix was produced in a loop reactor and a first gas phase reactor, and an elastomeric phase was produced in a second gas phase reactor.

The catalyst used in the polymerization process was produced as follows: First, 0.1 mol of MgCl ₂ x 3 EtOH was suspended in 250 ml of decane in an inert atmosphere in the reactor at ambient pressure. The solution was kept at the same temperature and cooled to a temperature of -15 ℃, while the addition of 300 ㎖ cold TiCl ₄ from the level. Thereafter, the temperature of the slurry was gradually increased to 20 占 폚. At this temperature, 0.02 mol of dioctyl phthalate (DOP) was added to the slurry. After the addition of phthalate, the temperature was raised to 135 DEG C for 90 minutes and the slurry was allowed to stand for 60 minutes. It was then again added to the TiCl ₄ in 300 ㎖ other, and maintaining the temperature at 135 ℃ for 120 minutes. The catalyst was then filtered from the liquid and washed 6 times with 80 ml of heptane at 80 < 0 > C. The solid catalyst component was then filtered and dried. The catalyst and its manufacturing concept are generally described, for example, in patent publications EP491566, EP591224 and EP586390. Triethylaluminum (TEAL) was used as a cocatalyst and dicyclopentyldimethoxysilane (D-donor) was used as a donor. The ratio of aluminum to donor is given in Table 1.

Prior to the polymerization, the catalyst was prepolymerized with vinylcyclohexane in an amount to achieve a concentration of 200 ppm poly (vinylcyclohexane) (PVCH) in the final polymer. Each process is described in EP 1 028 984 and EP 1 183 307.

Table 1: Properties of Polymers (HPP1a), (HPP1b), (HPP1c), (HPP1d) and (HPP2)

The compositions of Inventions 1 to 10 are prepared using a Coperion STS-35 2-axis extruder based on the recipe summarized in Table 2.

Table 2: Composition recipe for Inventions 1 to 10:

* The remainder to 100 wt .-% is typical of additives such as antioxidants and UV light stabilizers

EE: Commodity "POE 8150" from Dow Chemical Company of Shanghai, China. It is an elastomeric copolymer of ethylene and octene having an ethylene content of 61 wt .-%, MFR ₁ (190 ° C, 2.16 kg) of 0.5 g / 10 min, and a density of 0.868 g / c 3.

HDPE: having a density of 0.95 g / cm 3 and MFR ₁ (190 캜, 2.16 kg) of 7.5 g / 10 min Panjin Petrochem. Co. Quot; HD5070EA "available from Panjin, Liaoning, China.

F : commercially available Talc "HTP Ultra 5 " of IMI Fabi China with a d ₅₀ of 0.65 μm.

P : Shanghai Yuchengcanxing Plastic Material Ltd. &Quot; CMB899-Black 9557 ", commercially available from China (Shanghai, China).

AC: Commercially available polypropylene powder "HC001A-B1" from Borealis AG having MFR ₂ (230 캜, 2.16 kg) of 2.5 g / 10 min.

A 35 mm diameter Coperion STS-35 2-axis extruder available from Coperion (Nanjing) Corporation (China) is used for the preparation of the inventive example comprising the polypropylene composition of the present invention. The twin-screw extruder runs at a temperature profile of 190-235 ° C at an average rotational speed of 400 rpm. It has a L / D of 44. The temperature of each zone, the throughput rate and the axial speed of the extruder during the preparation of the inventive compositions are listed in Table 3.

Table 3: Extruder parameters for inventive examples 1 to 10:

Temperature in the TZ zone

TD die temperature

MT melt temperature

T throughput

SS axis speed

V vacuum

The temperature of each zone, the throughput rate and the axial speed of the extruder are planned parameters and are set on the control panel of the extruder. The melt temperature (the temperature of the melt at the die) and the torque of the extruder are passive parameters visible on the control panel of the extruder. The vacuum bump is located in zone 9 and produces a vacuum of -0.01 MPa inside the extruder.

AC is used as a carrier and dispersant for further additives (anti-scratch agents, antioxidants and UV light stabilizers). AC and further additives are premixed and then the resulting mixture is fed into an extruder through a feeder 1 located in zone 1 of the extruder together with HPP1a / HPP1b / HPP1c / HPP1d, HPP2, EE, HDPE and P. F is fed into the extruder through a side feeder located in zone 3 of the extruder. The contents of the extruder are heated and mixed through zones 1-11 of the extruder and granulated through the die head of the extruder.

In the manufacture of molded sheets for measurement of mechanical properties such as tensile, flexural, and impact properties (e.g., Izod Notched, 23 ° C) and regular molded specimens used for measurement of "Tiger-stripes" An injection molding machine, Victory 120, available from Machinery (Shanghai) Ltd., is used. Injection molding machines include uniaxial plastic parts and injection parts. The shortening plastic part comprises three heating zones. The injection part includes a nozzle and a mold. In the preparation of a regular test sample for the measurement of mechanical properties, the mold is regular with a rectangular or oval hollow cavity with a small "V" notch on one edge, which is required in the tests mentioned above Is specified.

The pellets of each composition IE1 to IE10 obtained from the extruder mentioned above are fed into an injection molding machine. The pellets are heated, melted, mixed in three heating zones and then injected into a mold through a nozzle to form a test sample in the shape of a rectangle or "dog bone" with a "V" notch for measurement of mechanical properties.

Although the above-mentioned injection molding machine is also used in the production of sample sheets for the measurement of "Tiger-stripes ", the mold is suitable for the production of rectangular sheets of dimensions 356 (L) mm x 70 (W) mm x 2 (T) Replace with mold. The hollow dimensions and shape of the mold correspond to the enantiomers of the sheet for the "Tiger-stripe" test.

The pellets of the composition of each example obtained in the above-mentioned extruder are fed into an injection molding machine. The pellets are heated, melted and mixed in three heating zones to obtain sheets for the test of "Tiger-stripes " and then injected into the hollow of the mold through the nozzles.

The process parameters for the injection-molding of the molded specimen to measure the mechanical properties for each embodiment are listed in Table 4. < tb > < TABLE >

Table 4: Molding process parameters of the specimen for measurement of mechanical properties

The process parameters for the injection-molding of the sheet for measuring the "Tiger stripe" for each example are listed in Table 5. [

Table 5: Molding conditions of sheet for Tiger stripe test

The mechanical properties of the molded specimen and the "Tiger stripe" of the formed sheet were measured according to the above-mentioned method and are shown in Table 6. The mechanical and optical properties (Tiger stripe) profiles of prior art formulations Comparative Example 1 (CE1) and Comparative Example 2 (CE2) are also summarized in Tables 6 (6a-6b). The mechanical and optical properties of the prior art products (CE1 and CE2) are also tested according to the same method as used in Examples 1 to 10.

Table 6a: Characteristics of Inventive Example

Table 6b: Characteristics of Inventive and Comparative Examples

E removed

C remarkable

UC not noticeable

CE1 is a commodity comprising 67 wt .-% heterophasic propylene copolymer, 8 wt .-% HDPE, and 20 wt .-% talc and a balanced additive. The heterophasic propylene copolymer has a MFR of 18 g / 10 min ₂ (230 DEG C, 2.16 kg), 20% ethylene content, 30 wt .-% XCS, 29 wt .-% AM and the AM of the heterophasic propylene copolymer has a 69 wt .-% ethylene content.

CE2 is available from Pret Composites Co. Ltd. (Shanghai, China), which contains polypropylene, C2-C8 elastomer copolymer, HDPE, talc, and balanced additives with MFR ₂ (230 캜, 2.16 kg) Quot; C3322T-2 ".

It can be seen from Tables 6a and 6b that the occurrence of the tiger stripe in the inventive example is eliminated in comparison with Comparative Examples CE1 and CE2. In addition, the inventions including EE, HDPE and F not only show a good balance of mechanical properties, such as notched impact strength, stiffness, but also maintain tensile strength compared with Comparative Examples CE1 and CE2 containing similar components, Better.

Claims

a) from 40.0 to 60.0 wt.%, based on the total weight of the polypropylene composition (PP), having a melt flow index MFR ₂ (230 DEG C, 2.16 kg) measured according to ISO 1133 of 20.0 to 80.0 g / The first heterophasic propylene copolymer (HPP1),
b) from 3.0 to 20.0 wt.%, based on the total weight of the polypropylene composition (PP), of a melt flow index MFR ₂ (230 DEG C, 2.16 kg), measured according to ISO 1133 of 0.2 to 0.5 g / The second heterophasic propylene copolymer (HPP2),
c) from 50.0 wt.%, based on the total weight of the elastomeric ethylene copolymer (EE), of from 5.0 to 20.0 wt.%, based on the total weight of the polypropylene composition (PP), of an elastomeric ethylene copolymer (EE) , An elastomeric ethylene copolymer (EE) having an ethylene unit content of at least < RTI ID = 0.0 >
d) from 5.0 to 10.0 wt.% of high density polyethylene (HDPE), based on the total weight of the polypropylene composition (PP), and
e) from 15.0 to 25.0 wt.% of an inorganic filler (F), based on the total weight of the polypropylene composition (PP)
Wherein the polypropylene composition (PP)
i) The amount of the first heterophasic propylene copolymer (HPP1) is in the range of 66.6 to 95.2 wt%, based on the total weight of the first heterophasic propylene copolymer (HPP1) and the second heterophasic propylene copolymer (HPP2) ego,
ii) The amount of the second heterophasic propylene copolymer (HPP2) is in the range of 4.8 to 33.4 wt.%, based on the total weight of the first heterophasic propylene copolymer (HPP1) and the second heterophasic propylene copolymer (HPP2) ego,
The second heterophasic propylene copolymer (HPP2)
(XC) fraction (25 DEG C), measured according to ISO 16152, of from 9.0 to 20.0 wt.%, based on the total weight of the second heterophasic propylene copolymer (HPP2)
b ') an ethylene content of from 3.0 to 8.0 wt.%, based on the total weight of the second heterophasic propylene copolymer (HPP2)
c ') amorphous (AM) phase having an intrinsic viscosity (IV) of 3.0 to 4.0 dl / g, and
amorphous (AM) phase having an ethylene content of 30.0 to 37.0 wt.%, based on the total weight of the amorphous (AM) fraction of the second heterophasic propylene copolymer (HPP2)
(PP). &Lt; / RTI >

The polypropylene composition (PP) according to claim 1, wherein the first heteropolypropylene copolymer (HPP1) has at least one of the following (a) to (e):
a) a melt flow index MFR ₂ (230 ° C, 2.16 kg) measured according to ISO 1133 of 20.0 to 75.0 g / 10 min,
b) a fraction of xylene low temperature solubles (XCS) (25 DEG C), measured according to ISO 16152, of 15.0 to 25.0 wt.%, based on the total weight of the first heterophasic propylene copolymer (HPP1)
c) an ethylene content of less than 15.0 wt.%, based on the total weight of the first heterophasic propylene copolymer (HPP1)
d) an amorphous (AM) phase having an intrinsic viscosity (IV) of 2.0 to 3.0 dl / g,
e) Amorphous (AM) phase having an ethylene content of 33.0 to 40.0 wt.%, based on the total weight of the amorphous (AM) phase of the first heterophasic propylene copolymer (HPP1).

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The method according to claim 1 or 2, wherein the first heterophasic propylene copolymer (HPP1) comprises a polypropylene homopolymer matrix (PM1) and an elastomeric propylene copolymer (AM1) dispersed in the matrix (PM1) Or a second heterophasic propylene copolymer (HPP2) comprises a polypropylene homopolymer matrix (PM2) and an elastomeric propylene copolymer (AM2) dispersed in said matrix (PM2).

The polypropylene composition (PP) according to claim 4, wherein the polypropylene homopolymer matrix (PM1) of the first heteropolypropylene copolymer (HPP1) has at least one of the following (a) or (b):
a) a melt flow index MFR ₂ (230 ° C, 2.16 kg) measured according to ISO 1133 of 30.0 to 250.0 g / 10 min,
b) a fraction of xylene low temperature solubles (XCS) measured according to ISO 16152 of 0.8 to 3.0 wt.%, based on the total weight of the polypropylene homopolymer matrix (PM1) of the first heterophasic propylene copolymer (HPP1) 25 C).

The polypropylene composition (PP) according to claim 4, wherein the polypropylene homopolymer matrix (PM2) of the second heterophasic propylene copolymer (HPP2) has at least one of the following (a) or (b):
a) a melt flow index MFR ₂ (230 ° C, 2.16 kg) measured according to ISO 1133 of from 0.1 to 3.0 g / 10 min,
b) a fraction of xylene low temperature solubles (XCS) (25) measured according to ISO 16152 of less than 2.0 wt.%, based on the total weight of the polypropylene homopolymer matrix (PM2) of the second heterophasic propylene copolymer (HPP2) ° C).

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The polypropylene composition (PP) according to claim 1, wherein the elastomeric ethylene copolymer (EE) has at least one of the following (a) to (c):
a) a comonomer unit selected from ethylene units and C ₄ to C ₁₂ ? -olefins,
b) has an ethylene unit content of from 50.0 to 75.0 wt.%, based on the total weight of the elastomeric ethylene copolymer (EE)
c) has a melt flow index MFR ₁ (190 ° C, 2.16 kg), measured according to ISO 1133 of 0.25 to 30.0 g / 10 min.

The polypropylene composition (PP) according to claim 1, wherein the high density polyethylene (HDPE) has at least one of the following (a) or (b):
a) a melt flow index MFR ₁ (190 ° C, 2.16 kg), measured according to ISO 1133 of 0.2 to 15.0 g / 10 min,
b) Density of not less than 930 kg / m3.

The polypropylene composition (PP) according to claim 1, wherein the inorganic filler (F) has at least one of the following (a) or (b)
a) selected from the group consisting of talc, mica, calcium carbonate, diatomaceous earth, wollastonite and kaolin,
b) has an average particle size d ₅₀ of 0.65 to 20 μm.

The polypropylene composition (PP) according to claim 1, wherein the polypropylene composition (PP) has at least one of the following (a) or (b)
a) the flexural modulus measured according to ISO 178 over 1500 MPa,
b) Izod notched impact strength (1A; + 23 ° C) measured according to ISO 180 above 30 kJ / m 2.

3. The composition of claim 1 or 2, wherein the first heterophasic propylene copolymer (HPP1), the second heterophasic propylene copolymer (HPP2), or the first heterophasic propylene copolymer (HPP1) and the second heterophasic propylene copolymer Polypropylene composition (PP) in which the cohesion (HPP2) is? -Corrugated.

An article comprising the polypropylene composition (PP) according to claims 1 or 2.

14. The article of claim 13, wherein the article is a molded article.

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