Abstract:
The present invention is directed to a heterophasic polypropylene composition having an improved balance of desirable properties, i.e. high stiffness, high toughness, and high transparency. The heterophasic polypropylene composition of the present invention comprises 60.0 to 95.0 wt % of a crystalline propylene homopolymer with a melting temperature Tm1 measured by differential scanning calorimetry of higher than 155° C., 5.0 to 20.0 wt % of an elastomeric ethylene-propylene rubber, and at least one polymeric nucleating agent, wherein the crystalline propylene homopolymer (H-PP) and the elastomeric ethylene-propylene rubber (EPR) have been produced in the presence of a single-site catalyst, wherein the heterophasic polypropylene composition is characterized by a soluble fraction determined in 1,2,4-trichlorobenzene at 40° C. in the range of 5.0 to 20.0 wt %, and wherein the soluble fraction has an ethylene in content in the range of 12.0 to 40.0 wt %. The present invention is further directed to a process for the preparation of the heterophasic polypropylene composition comprising polymerizing propylene in at least three polymerization steps in the presence of a single-site catalyst, wherein the at least one polymeric nucleating agent is introduced either as a master batch by a compounding step or via a prepolymerization step prior to the first polymerization step. The present invention is further directed to an article obtained by extrusion of the heterophasic polypropylene composition, and to a packaging article comprising the extruded article. Finally, the present invention is directed to the use of the heterophasic polypropylene composition for the production of extruded articles such as films or sheets.
Abstract:
Catalyst system for producing ethylene copolymers in a high temperature solution process, the catalyst system comprising (i) a metallocene complex of formula (I) wherein M is Hf X is a sigma ligand, L is a bridge of the formula —SiR82—, wherein each R8 is independently a C1-C20-hydrocarbyl, tri(C1-C20-alkyl)silyl, C6-C20-aryl, C7-C20-arylalkyl or C7-C20-alkylaryl n is 0, 1 or 2 R1 and R1′ are the same or can be different and can be a linear or branched C1-C6-alkyl group, R2 and R2′ are the same or are different and are a CH2—R9 group, with R9 being H or linear or branched C1-C6-alkyl group R5 and R5′ are the same or are different and can be H or a linear or branched C1-C6-alkyl group or a OR group, wherein R is a C1-C6-alkyl group R6 and R6′ are the same or are different and can be H or a C(R10)3 group, with R10 being the same or different and R10 can be H or a linear or branched C1-C6-alkyl group or R5 and R6 and/or R5′ and R6′ taken together form an unsubstituted 4-7 membered ring condensed to the benzene ring of the indenyl moiety, and R7 and R7′ can be the same or are different and can be H or a linear or branched C1-C6-alkyl group (ii) an aluminoxane cocatalyst and/or (iii) a boron containing cocatalyst and (iv) optionally an aluminium alkyl compound.
Abstract:
A heterophasic propylene ethylene copolymer having an MFR2 of 0.5 to 100 g/10m in and obtained using single site catalysis comprising: (i) a propylene homopolymer or propylene ethylene copolymer matrix having up to 4 wt % ethylene; and (ii) an ethylene propylene rubber (EPR) dispersed in the matrix; said heterophasic propylene ethylene copolymer having a xylene cold soluble content (XS) of 20 to 40%; wherein the ethylene content of the xylene cold soluble fraction of said heterophasic propylene ethylene copolymer is between 70 and 90 wt.%; wherein the xylene cold soluble fraction of said heterophasic propylene ethylene copolymer has an intrinsic viscosity (IV) of 3.0 dl/g or more; and wherein the melting enthalpy (AHM) of the heterophasic propylene ethylene copolymer is between 10 and 30 J/g at a temperature of 0 to 130° C.
Abstract:
Polypropylene composition comprising comonomer units derived from ethylene in an amount of from 9.0 to 52.0 mol-% and comonomer units derived from a higher a-olefin in an amount of from 0.4 to 3.0 mol-%, wherein said polypropylene composition has an amount of xylene cold solubles of at least 30 wt.-%, wherein further the xylene cold soluble fraction has an ethylene content of from 20.0 to 80.0 mol-% and a higher a-olefin content from 0.1 to 1.5 mol-%.
Abstract:
A catalyst in solid particulate form free from an external carrier material comprising (i) a complex of formula (I) wherein M is zirconium or hafnium; each X is a sigma ligand; L is a divalent bridge selected from —R′2C—, —R′2C—CR′2—, —R′2Si—, —R′2Si—SiR′2—, —R′2Ge—, wherein each R′ is independently a hydrogen atom, C1-20-alkyl, tri(C1-20-alkyl)silyl, C6-20-aryl, C7-20-arylalkyl or C7-20-alkylaryl; R2 is a C1-20-hydrocarbyl radical; R2′ is a C1-20-hydrocarbyl radical; R6 is a linear or branched aliphatic C1-20-hydrocarbyl group, SR9 or OR9; R6′ is a linear or branched aliphatic C1-20-hydrocarbyl group, SR9′ or OR9′; with the proviso that neither R6 or R6′ represents a group having a quaternary carbon atom directly attached to the indenyl ring; R9 is a C1-20-hydrocarbyl group; R9′ is a C1-20-hydrocarbyl group; Ar is a C6-12-aryl or C5-12-heteroaryl group optionally carrying one or more substituents R8; Ar′ is a C6-12-aryl or C5-12-heteroaryl group optionally carrying one or more substituents R8′; each R8 is a C1-20-hydrocarbyl group; each R8′ is a C1-20-hydrocarbyl group; and wherein at least two of R2 and R2′; R6 and R6′; or Ar and Ar′ are the same; and (ii) a cocatalyst comprising a compound of a group 13 metal, e.g. Al or boron.
Abstract:
Catalyst system for producing ethylene copolymers in a high temperature solution process, the catalyst system comprising (i) a metallocene complex of formula (I) wherein: M is Hf or a mixture with Zr, provided that more than 50% by moles of the complex of Formula (I) has M=Hf; X is a sigma ligand; R are the same or different from each other and can be saturated linear or branched C1-C10 alkyl, C6-C10 aryl, C4-C10 heteroaryl, C6-C20 alkylaryl or C6-C20 arylalkyl groups, which can optionally contain up to 2 heteroatoms or silicon atoms; R1 is a C6-C10 aryl or C6-C20 alkylaryl group optionally containing up to 2 heteroatoms or silicon atoms or a C4-C10 heteroaryl group; R2 is a C4-C20 cycloalkyl group, optionally carrying alkyl substituents in beta-positions, of formula (II) in which R′ can be the same or can be different from each other and can be hydrogen or is defined as R and n is 1 to 17 (ii) a boron containing cocatalyst
Abstract:
Catalyst system for producing ethylene copolymers in a high temperature solution process, the catalyst system comprising (i) a metallocene complex of formula (I), M is Hf or a mixture with Zr, provided that more than 50% by moles of the complex of Formula I has M=Hf, X is a sigma ligand, R are the same or different from each other and can be saturated linear or branched C1-C10 alkyl, C5-C10 aryl, C6-C20 alkylaryl or C6-C20 arylalkyl groups, which can optionally contain up to 2 heteroatoms or silicon atoms, R1 is a C6-C20-aryl, which can be unsubstituted or substituted by one or up to 5 linear or branched C1-C10 alkyl group(s), R2 is a saturated linear or cyclic C3-C20 alkyl group or a branched CR3R4R5 group, wherein R3 is hydrogen or an C1-C20 alkyl group and R4 and R5 are the same or are different and can be an C1-C20 alkyl group and (ii) a boron containing cocatalyst
Abstract:
A complex of formula (I) wherein M is zirconium or hafnium; each X independently is a sigma ligand; L is a divalent bridge selected from —R′2C—, —R′2C—CR′2—, —R′2Si—, —R′2Si—SiR′2—, —R′2Ge—, wherein each R′ is independently a hydrogen atom or a C1-C20-hydrocarbyl group optionally containing one or more silicon atoms or heteroatoms of Group 14-16 of the periodic table or fluorine atoms, and optionally two R′ groups taken together can form a ring; R2 and R2′ are each independently a C1-C20 hydrocarbyl group, —OC1-hydrocarbyl group or —SC1-20 hydrocarbyl group; R5 is a —OC1-20 hydrocarbyl group or —SC1-20 hydrocarbyl group, said R5 group being optionally substituted by one or more halo groups; R5′ is hydrogen or a C1-20 hydrocarbyl group; —OC1-20 hydrocarbyl group or —SC1-20 hydrocarbyl group; said C1-20 hydrocarbyl group being optionally substituted by one or more halo groups; R6 and R6′ are each independently a C1-20 hydrocarbyl group; —C1-20 hydrocarbyl group or —SC1-20 hydrocarbyl group; each R1 and R1′ are independently —CH2Rx wherein Rx are each independently H, or a C1-20 hydrocarbyl group, optionally containing heteroatoms.
Abstract:
The present invention relates to an olefin polymerization process for producing propylene copolymer composition (P), wherein propylene, C4 to C10 α-olefin and optionally ethylene are reacted in the presence of a Ziegler-Natta catalyst in a multistage polymerization process comprising at least two polymerization reactors, wherein the copolymer composition is bimodal with respect to the content of C4 to C10 α-olefin and, if present, to ethylene. Further, the invention is directed to the propylene copolymer composition being bimodal with respect to the content of C4 to C10 α-olefin and optionally to ethylene, and use of said propylene copolymer compositions for producing articles.
Abstract:
The present invention relates to an olefin polymerization process, wherein propylene and 1-butene and optionally ethylene are reacted in the presence of a Ziegler-Natta catalyst system so as to obtain a polypropylene, wherein the polypropylene comprises 1-butene-derived comonomer units in an amount of from 0.5 to 15 wt % and optionally ethylene-derived comonomer units in an amount of up to 3 wt %, and the Ziegler-Natta catalyst system comprises an external donor of the formula (I) (R3)z(R2O)YSi(R1)X (I).