Provided are a film having an excellent balance between heat seal strength and opening strength, a method of producing the film, and a bag obtained by heat-sealing the film. According to the present invention, there is provided a film containing a resin, wherein a resin density of the film is 860 kg/m.sup.3 or more and less than 900 kg/m.sup.3, and on at least one surface of the film, an arithmetic mean height Sa satisfies the following Expression [1]:
0.10 μm≤Sa≤0.50 μm  [1], and a minimum autocorrelation length Sal satisfies the following Expression [2]:
0.2 μm≤Sal≤10.4 μm  [2].

Provided are a film having an excellent balance between heat seal strength and opening strength, a method of producing the film, and a bag obtained by heat-sealing the film. According to the present invention, there is provided a film containing a resin, wherein a resin density of the film is 860 kg/m.sup.3 or more and less than 900 kg/m.sup.3, and on at least one surface of the film, an arithmetic mean height Sa satisfies the following Expression [1]:
0.10 μm≤Sa≤0.50 μm  [1], and a minimum autocorrelation length Sal satisfies the following Expression [2]:
0.2 μm≤Sal≤10.4 μm  [2].

A complex of formula (I): (I′) M is Hf; each X is a sigma ligand; L is a bridge of formula -(ER.sup.8.sub.2).sub.y—; y is 1 or 2; E is C or Si; each R.sup.8 is independently a C.sub.1-C.sub.20-hydrocarbyl, tri(C.sub.1-C.sub.20-alkyl)silyl, C.sub.6-C.sub.20-aryl, C.sub.7-C.sub.20-arylalkyl or C.sub.7-C.sub.20-alkylaryl or L is an alkylene group such as methylene or ethylene; Ar and Ar′ are each independently an aryl or heteroaryl group optionally substituted by 1 to 3 groups R.sup.1 or R.sup.1′ respectively; R.sup.1 and R.sup.1′ are each independently the same or can be different and are a linear or branched C.sub.1-C.sub.6-alkyl group, C.sub.7-20 arylalkyl, C.sub.7-20 alkylaryl group or C.sub.6-20 aryl group with the proviso that if there are four or more R.sup.1 and R.sup.1′ groups present in total, one or more of R.sup.1 and R.sup.1′ is other than tert butyl; R.sup.2 and R.sup.2′ are the same or are different and are a CH.sub.2—R.sup.9 group, with R.sup.9 being H or linear or branched C.sub.1-C.sub.6-alkyl group, C.sub.3-8 cycloalkyl group, C.sub.6-10 aryl group; each R is a —CH.sub.2—, —CHRx- or C(Rx).sub.2- group wherein Rx is C.sub.1-4 alkyl and where m is 2-6; R.sup.5 is a linear or branched C.sub.1-C.sub.6-alkyl group, C.sub.7-20 arylalkyl, C.sub.7-20 alkylaryl group or C.sub.6-C.sub.20-aryl group; R.sup.6 is a C(R.sup.10).sub.3 group, with R.sup.10 being a linear or branched C.sub.1-C.sub.6 alkyl group; and R.sup.6 and R.sup.7′ are the same or are different and are H or a linear or branched C.sub.1-C.sub.6-alkyl group. Invention relates also to a catalyst in solid form comprising (i) a complex of formula (I) and (ii) a cocatalyst of an aluminium compound and (iii) a cocatalyst of a boron compound. ##STR00001##

A complex of formula (I): (I′) M is Hf; each X is a sigma ligand; L is a bridge of formula -(ER.sup.8.sub.2).sub.y—; y is 1 or 2; E is C or Si; each R.sup.8 is independently a C.sub.1-C.sub.20-hydrocarbyl, tri(C.sub.1-C.sub.20-alkyl)silyl, C.sub.6-C.sub.20-aryl, C.sub.7-C.sub.20-arylalkyl or C.sub.7-C.sub.20-alkylaryl or L is an alkylene group such as methylene or ethylene; Ar and Ar′ are each independently an aryl or heteroaryl group optionally substituted by 1 to 3 groups R.sup.1 or R.sup.1′ respectively; R.sup.1 and R.sup.1′ are each independently the same or can be different and are a linear or branched C.sub.1-C.sub.6-alkyl group, C.sub.7-20 arylalkyl, C.sub.7-20 alkylaryl group or C.sub.6-20 aryl group with the proviso that if there are four or more R.sup.1 and R.sup.1′ groups present in total, one or more of R.sup.1 and R.sup.1′ is other than tert butyl; R.sup.2 and R.sup.2′ are the same or are different and are a CH.sub.2—R.sup.9 group, with R.sup.9 being H or linear or branched C.sub.1-C.sub.6-alkyl group, C.sub.3-8 cycloalkyl group, C.sub.6-10 aryl group; each R is a —CH.sub.2—, —CHRx- or C(Rx).sub.2- group wherein Rx is C.sub.1-4 alkyl and where m is 2-6; R.sup.5 is a linear or branched C.sub.1-C.sub.6-alkyl group, C.sub.7-20 arylalkyl, C.sub.7-20 alkylaryl group or C.sub.6-C.sub.20-aryl group; R.sup.6 is a C(R.sup.10).sub.3 group, with R.sup.10 being a linear or branched C.sub.1-C.sub.6 alkyl group; and R.sup.6 and R.sup.7′ are the same or are different and are H or a linear or branched C.sub.1-C.sub.6-alkyl group. Invention relates also to a catalyst in solid form comprising (i) a complex of formula (I) and (ii) a cocatalyst of an aluminium compound and (iii) a cocatalyst of a boron compound. ##STR00001##

Mixed-plastic-polyethylene composition having a melt flow rate (ISO 1133, 2.16 kg, 190° C.) of from 0.2 to 0.7 g/10 min; and a density of from 956 to 965 kg/m.sup.3, preferably from 958 to 964 kg/m.sup.3.

A multimodal polyethylene composition having a lower molecular weight (LMW) ethylene homo or copolymer component (A) and a higher molecular weight ethylene copolymer component (B); wherein the LMW component comprises two fractions (ai) and (aii); wherein the polymer composition has a density of 930 kg/m3 or more (ISO1183), such as 938 to 955 kg/m3, an MFR2 (ISO1133 at 190° C. and 2.16 kg load) in the range of 0.05 to 10 g/10 min, a flex modulus of up to 800 MPa (ISO 178:2010), such as 300 to 800 MPa (ISO 178:2010) and a taber abrasion resistance of 8.0 to 13.0 mg/1000 cycle (ASTM D 4060: 2014).

A multimodal polyethylene composition having a lower molecular weight (LMW) ethylene homo or copolymer component (A) and a higher molecular weight ethylene copolymer component (B); wherein the LMW component comprises two fractions (ai) and (aii); wherein the polymer composition has a density of 930 kg/m3 or more (ISO1183), such as 938 to 955 kg/m3, an MFR2 (ISO1133 at 190° C. and 2.16 kg load) in the range of 0.05 to 10 g/10 min, a flex modulus of up to 800 MPa (ISO 178:2010), such as 300 to 800 MPa (ISO 178:2010) and a taber abrasion resistance of 8.0 to 13.0 mg/1000 cycle (ASTM D 4060: 2014).

The present invention relates to use of a polypropylene composition comprising a polypropylene having—a melt flow rate MFR2 (230° C./2.16 kg) measured according to ISO 1133 of 10 to 40 g/10 min, —a melting temperature T.sub.m as determined by DSC according to ISO 11357 of 149 to 160° C., and—a molecular weight distribution MWD of 2.4 to 4.5 as determined by GPC, for extrusion coating of an article, to a process for extrusion coating of an article and to an extrusion coated article.

The present invention relates to use of a polypropylene composition comprising a polypropylene having—a melt flow rate MFR2 (230° C./2.16 kg) measured according to ISO 1133 of 10 to 40 g/10 min, —a melting temperature T.sub.m as determined by DSC according to ISO 11357 of 149 to 160° C., and—a molecular weight distribution MWD of 2.4 to 4.5 as determined by GPC, for extrusion coating of an article, to a process for extrusion coating of an article and to an extrusion coated article.

A method for producing an olefin polymerization catalyst includes bringing a solid catalyst component for olefin polymerization, a vinylsilane compound, an organosilicon compound, and an organoaluminum compound into contact with each other in an inert organic solvent under an inert gas atmosphere in the absence of a specific vinyl compound, wherein a washing treatment is not performed after the vinylsilane compound has been added to the reaction system, the solid catalyst component includes a magnesium compound, a titanium halide compound, and an electron donor compound that does not include a phthalic acid ester structure, and includes a diol skeleton, and the organosilicon compound does not include a vinyl group, and includes at least one group selected from an alkoxy group and an amino group.