Classifications

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  • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
  • B32B7/04—Interconnection of layers
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  • B32B27/10—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
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  • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
  • B32B27/304—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
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  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F110/00—Homopolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
  • C08F110/04—Monomers containing three or four carbon atoms
  • C08F110/06—Propene
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F2/00—Processes of polymerisation
  • C08F2/04—Polymerisation in solution
  • C08F2/06—Organic solvent
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F4/00—Polymerisation catalysts
  • C08F4/42—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors
  • C08F4/44—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides
  • C08F4/60—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides together with refractory metals, iron group metals, platinum group metals, manganese, rhenium technetium or compounds thereof
  • C08F4/62—Refractory metals or compounds thereof
  • C08F4/64—Titanium, zirconium, hafnium or compounds thereof
  • C08F4/65—Pretreating the metal or compound covered by group C08F4/64 before the final contacting with the metal or compound covered by group C08F4/44
  • C08F4/652—Pretreating with metals or metal-containing compounds
  • C08F4/654—Pretreating with metals or metal-containing compounds with magnesium or compounds thereof
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
  • C08J5/18—Manufacture of films or sheets
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
  • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
  • C08L23/10—Homopolymers or copolymers of propene
  • C08L23/12—Polypropene
• • B—PERFORMING OPERATIONS; TRANSPORTING
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  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2250/00—Layers arrangement
  • B32B2250/05—5 or more layers
• • B—PERFORMING OPERATIONS; TRANSPORTING
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  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2250/00—Layers arrangement
  • B32B2250/24—All layers being polymeric
  • B32B2250/242—All polymers belonging to those covered by group B32B27/32
• • B—PERFORMING OPERATIONS; TRANSPORTING
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  • B32B2255/00—Coating on the layer surface
  • B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
• • B—PERFORMING OPERATIONS; TRANSPORTING
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  • B32B2307/40—Properties of the layers or laminate having particular optical properties
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• • B—PERFORMING OPERATIONS; TRANSPORTING
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  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
  • B32B2307/514—Oriented
  • B32B2307/518—Oriented bi-axially
• • B—PERFORMING OPERATIONS; TRANSPORTING
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  • B32B2307/00—Properties of the layers or laminate
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• • B—PERFORMING OPERATIONS; TRANSPORTING
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  • B32B2307/724—Permeability to gases, adsorption
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  • B32B2307/7244—Oxygen barrier
• • B—PERFORMING OPERATIONS; TRANSPORTING
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• • B—PERFORMING OPERATIONS; TRANSPORTING
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  • B32B2439/70—Food packaging
• • B—PERFORMING OPERATIONS; TRANSPORTING
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• • B—PERFORMING OPERATIONS; TRANSPORTING
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  • B32B2553/00—Packaging equipment or accessories not otherwise provided for
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2203/00—Applications
  • C08L2203/16—Applications used for films
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2205/00—Polymer mixtures characterised by other features
  • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
  • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2205/00—Polymer mixtures characterised by other features
  • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
• • C—CHEMISTRY; METALLURGY
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  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2207/00—Properties characterising the ingredient of the composition
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• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2308/00—Chemical blending or stepwise polymerisation process with the same catalyst

Definitions

• the present invention relates to a polypropylene that may be used in producing biaxially oriented polypropylene (BOPP) films. Structural characteristics of the claimed polypropylene allow to produce BOPP films at a processing rate of at least 430 m/min without originating breaks of a film web.
• the invention also relates to a composition of the claimed polypropylene with stabilizers, which composition is suitable for using biaxially oriented polypropylene (BOPP) films.
• the invention also relates to a method for producing, in a hydrocarbon solvent medium, polypropylene possessing a complex of required properties, which makes propylene suitable for making BOPP films with satisfactory physical and mechanical characteristics and optical indices therefrom.
• the invention relates to BOPP films, at least one layer of which comprises the polypropylene according to the present invention.
• the films according to the invention may be used in the manufacture of packages, including food packages, adhesive tapes, labels and the like.
• BOPP films due to the complex of unique properties are highly essential materials almost in all consumption fields where a flexible package is required.
• BOPP films are used in the manufacture of a food products package and non-food products, in the form of individual or grouped packages, wherein the package depending on color of a filler may be both transparent and metalized, or mat.
• BOPP films are used in the manufacture of labels, adhesive tapes and the like. The capability of an initial polypropylene to be efficiently processed into the
• BOPP film that would have the required complex of strength and optical properties is defined by the combination of polypropylene characteristics such as a crystallinity degree, molecular weight and the like.
• the presence in the initial polypropylene of cold xylene soluble fractions has the essential significance to produce the BOPP film.
• These fractions mainly comprise an amorphous fraction of the polymer, and also a low molecular isotactic fraction, and oligomeric products, thus the index in fact reflects the crystallinity degree of the polymer and to some extent a molecular weight distribution value.
• the isotacticity degree of the propylene may also be expressed through the amount of isotactic meso pentads (or triads) determined by the 13 C NMR spectroscopy method.
• the molecular weight distribution (MWD) value also has the great importance in processing the polypropylene into the film, said MWD value may be determined, for example, by gel-penetrating chromatography method.
• the effective method of producing a polymer with wide MWD is the implementation to a multi-stage scheme of a polymer synthesis process according to which at separate stages polymer fractions having different molecular weights and correspondingly a melt flow rate (MFR) are obtained, and the final polymer is characterized with bimodal MWD.
• MFR melt flow rate
• Application US20110031645 A [Dow Global Technologies Inc., 10.02.11] discloses a method comprising at least two steps of producing a polymer having a MWD greater than 5 and having a content of cold xylene soluble factions of from 5 to 8 wt.%, a content of isotactic meso-pentads of less than 92.5 wt.% and melt flow rate (MFR) of from 1.0 to 4.0 g/10 min (at 230°C and 2.16 kg).
• MFR melt flow rate
• the polypropylene according to the application may be obtained by a liquid phase or gas phase polymerization or a combination thereof.
• the MFR of polypropylene fractions obtained at individual stages of the method is determined based on the required MFR value of the final polymer that varies, preferably, in the range from 2 to 3.5 g/10 min, and at the MFR ratio of the final polymer to the MFR of the polypropylene faction obtained at the first step of the method, - in the range from 1 to 20.
• the final polymer may be processed into the BOPP film with the processing rate of at least 400 m/min.
• the document does not provide any data disclosing the properties of the ready-to-use film, in particular, physical and chemical indices.
• the high content in the polypropylene of xylene soluble fractions may result in carbonization on the processing equipment and consequently in the necessity to conduct additional stops to clean the equipment, and also may be the reason of producing the film with low strength characteristic.
• Application WO2014/166779 A [Borealis, 16.10.14] describes a process of the propylene homopolymer manufacture characterized by MFR from 1.5 to 10 g/10 min, MWD greater than 9.0 and a cold xylene soluble fraction content of at least 2.8 wt.%.
• the obtained polymer is also characterized by content of 2,1-erythro region-defects equal to, or less than 0.4 wt.% and the content of isotactic meso-pentads greater than 93.5 wt.% (according to 13 C NMR spectrum).
• the polymer possessing above described properties is obtained by gas phase polymerization according to the scheme comprising two reactors at a temperature from 70 to 95°C.
• the MFR value of the polypropylene fraction obtained in the second reactor is 1-4 times greater than the MFR value of the polypropylene fraction obtained in the first reactor, and a ratio of weight contents of the fractions obtained in the first and second reactor respectively is within the range from 70:30 to 35:65.
• Data on processing conditions of the polypropylene to produce a BOPP film are not presented in the application.
• the polypropylene obtained by the indicated method is characterized with a low content of unreacted residual catalytic complex, this is the essential advantage of the process, because allows to eliminate the need for an additional stage of washing the polymer.
• patent EP2341088 B discloses a polypropylene and a method for producing the polypropylene for the manufacture of a biaxially oriented film with high heat resistance that is intended for the manufacture of capacitors.
• the polypropylene according to the invention is prepared by the catalytic polymerization using metallocene catalysts.
• metallocene catalysts it is preferable that the polymer would be obtained according to a multi-stage scheme that allows to obtain a multimodal polymer, it is also preferable to use a combination of bulk polymerization processes in a circulation reactor and the polymerization in a gas phase reactor.
• Distinctive properties of the obtained polypropylene are a cold xylene soluble fraction that is not more than 1.5 wt. % and the MWD from 2.8 to 8.0.
• the polypropylene is also characterized by the distribution of thicknesses of lamellas of the crystalline fraction, determined by a method of stepwise isothermal separation (SIST), namely: from 45.0 to 67.0 wt.% of the fraction with a lamella thickness in the range of 7.7 - 14.09 nm and from 18.0 to 50.0 of the fraction with a lamella thickness of more than 14.09 nm.
• SIST stepwise isothermal separation
• the polypropylene is characterized by a content of 2,1- erythro regio-defects determined by 13 C NMR- spectroscopy method that is at least 0.4 mol. %.
• the aforesaid patent does not comprise data on the technological effectiveness of polypropylene characterized with low content of xylene soluble (XS) fractions in the manufacture of BOPP film under conditions of high-speed processing lines. Furthermore, the polypropylene with the low XS content, which can be processed into BOPP film, is obtained by a combination of bulk polymerization and gas phase polymerization processes; there are no data about the possibility of producing the polypropylene with a similar index of the XS content for the production of BOPP film in a hydrocarbon solvent medium.
• XS xylene soluble
• the technical result of the present invention includes production in the hydrocarbon solvent medium of a bimodal polypropylene having low content of xylene soluble (XS) fractions that is capable of being processed into BOPP film at the processing rate of at least 430 m/min, wherein the bimodality of the polymer is provided by the implementation of the synthesis of the polypropylene according to a multi-stage scheme. Additional technical result incudes production of BOPP film that is characterized by improved physical, chemical and optical properties.
• XS xylene soluble
• Yet another technical result is the possibility of the obtainment of a wide spectrum of films: transparent, mat, filled, of general purpose, and the like, and also the possibility of applying coatings to the film, for example, a metalized layer, stamp and the like.
• isotactic polymer fraction (mmmm) is in the range from 87 to 91 % based on the polymer mass;
• the content of xylene soluble (XS) fractions in the polymer is in the range from 1.0 to 2.8 wt.%, preferably from 1.2 to 2.7 wt.%, the most preferably from 1.5 to 2.5 wt. % based on the polymer mass;
• the content of heptane soluble (HS) fractions in the polymer is in the range from 0.4 to 2.5 wt. %, preferably from 0.5 to 2.0 wt. %, the most preferably from 0.5 to 1.5 wt. % based on the polymer mass;
• MWD molecular weight distribution
• the polypropylene obtained by the polymerization in the hydrocarbon solvent medium according to a multi-stage scheme may be processed into a BOPP film at high-speed production line - at least 430 m/min, regardless of the low content of xylene soluble (XS) fractions and heptane soluble (HS) fractions contained therein.
• XS xylene soluble
• HS heptane soluble
• the possibility of processing the polypropylene into the BOPP film at the claimed rates is provided through the process of the polymer synthesis that is developed by the authors, resulting in a bimodal polymer with reduced isotacticity and wider MWD.
• the fact that the polypropylene has the above discussed complex of properties allows to manufacture on high-speed lines the BOPP film that is characterized by increased strength characteristics and improved appearance.
• isotactic polymer fraction is in the range from 87 to 91 % based on the polymer mass
• - content of xylene soluble (XS) fractions in the polymer is in the range from 1.0 to 2.8 wt. %, preferably from 1.2 to 2.7 wt. %, the most preferably from 1.5 to 2.5 wt. % based the polymer mass;
• - content of heptane soluble (HS) fractions in the polymer is in the range from 0.4 to 2.5 wt. %, preferably from 0.5 to 2.0 wt. %, the most preferably from 0.5 to 1.5 wt. % based on the polymer mass;
• MWD molecular weight distribution
• the present invention relates to a polymer to manufacture BOPP films at high processing rate (at least 430 m/min) and the absence of breakage that may be obtained with the use of applied titanium-magnesium Ziegler-Natta catalysts having the general formula MgCh/TiCWDi/E /TEA.
• titanium tetrahalides are applied to magnesium halogenides, Di is an internal donor, D2 - an outer donor, triethylaluminum (TEA1) is a cocatalyst.
• alcoholic amide
• amino group ester group
• Internal donors include, but are not limited to: methanol, ethanol, isopropanol and butanol, diethylamine, diisopropylamine and triethylamine, formamide and acetamide, C1-C20 alkyl esters of benzoic acid, Ci-Cs alkyl esters of aliphatic monocarboxylic acids, 1,8-naphthyl diesters, malonates, succinates and glutarates.
• organosilicon compounds which may be used in the present inventions include: diisopropyldimethoxysilane, tert-butylmethyldimethoxysilane, tert- butylmethyldiethoxysilane, tert-amylmethyldiethoxysilane, dicyclohexylmethyldimethoxysilane, cyclohexylmethyldimethoxysilane, cyclohexylmethyldiethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, tert- butyltriethoxysilane, phenyltriethoxysilane, cyclohexyltrimethoxysilane, cyclopentyltrimethoxysilane, 2-methylcyclopentyltrimethoxysilane, cyclopentyltriethoxysilane, n-propyltrimethoxysilane, dicyclopentyldimethoxysilane,
• cyclohexylmethyldimethoxysilane diisopropyldimethoxysilane, dicyclopentyldimethoxysilane, diisopropyldimethoxysilane.
• the polypropylene according to the present invention may be obtained according to any polymerization technology in a hydrocarbon solvent, which is known from prior art, for example, according with Montedison technology.
• suitable hydrocarbon solvents are C7+ hydrocarbon fractions or mixtures thereof, preferably heptane or heptane-hexane fraction, the most preferably - heptane.
• the authors of the present invention suggested that, in order to improve the processability of the polypropylene obtained by the aforesaid technology, it is necessary to organize the synthesis process so that it could be possible to widen the MWD of the polymer product taking into account low XS values (in the range from 1.0 to 2.8 wt.%, preferably from 1.2 to 2.7 wt.%, the most preferably from
• the authors have proposed a multi-stage method for producing a polypropylene in a hydrocarbon solvent medium according to a three- reactor scheme consisting of two reactors operating in parallel connected in series with a third reactor.
• the temperature of the conduction of the process is in the range of 50- 80°C, preferably in the range of 65-75°C and operating pressure is in the range of 0.1 to 0.6 MPa, preferably in the range of 0.5 to 0.55 MPa.
• the obtainment of the polypropylene with the required complex of properties is carried out by mixing in the third reactor the polymers with low and high MFR previously obtained in the first and second parallel reactors respectively.
• the polypropylene with the MFR in the range of 0.5-2.0 g/10 min, preferably 1.4-1.8 g/10 min is in the first parallel slurry reactor, and the polypropylene with the MFR in the range of 4.0-11.0 g/10 min, preferably 5.0-7.0 g/10 min - in the second reactor.
• One more important condition for achieving the claimed technical result is the maintenance of the ratio of conversion degrees in two parallel reactors that is equal to 70:30, the most preferably 50:50.
• the melt flow rate (MFR230 ° c/2.i6 kg ) of the used polymers determined according to ASTM D 1238 should be from 2.0 to 3.8 g/10 min, preferably from 2.5 to 3.5 g/10 min, the most preferably from 2.8 to 3.2 g/10 min.
• the polypropylene composition contains stabilizers, which can represent at least a mixture of antioxidants and acid scavengers.
• stabilizers can represent at least a mixture of antioxidants and acid scavengers. Any antioxidants known in the art are used as antioxidants, a mixture of phosphite and phenolic antioxidants is preferably used. Any acid scavenger known in the art that does not relate to the class of metal stearates may be used as the acid scavenger.
• other known additives which allow to polypropylene to retain its properties during processing and use may also be further used.
• the amount of stabilizers added into the polypropylene is from 1 to 3 kg per ton of the polypropylene, preferably from 1.5 to 2.8 kg per ton of the polypropylene, more preferably from 1.7 to 2.2 kg per ton of polypropylene.
• the polypropylene according to the invention is substantially free of calcium stearate.
• Stearic acid that easily migrates to the surface results from calcium stearate after the interaction thereof with acids, which makes it impossible to obtain a metallized film.
• the definition "substantially free of' means the content of less than 0.010 wt. %, preferably less than 0.005 wt. %, the most preferably less than 0.001 wt.%.
• the indicated polypropylene may be used as the main component and also as the additional component of any film layer and any formulations known from prior art.
• the exact structure of the film (the number and arrangement of layers) and the formulation of layers depend on the requirements for the film and articles made from the film.
• the film may contain other polyolefins, as well as functional polymers.
• Copolymers and terpolymers of a- olefins in particular copolymers of propylene and ethylene, propylene and butene, terpolymers of propylene, ethylene and butene, etc, are used as the polyolefins.
• Ethylene vinyl alcohol copolymers polyvinylidene chloride, vinylidene chloride copolymers, polyesters, polyamides (to impart gas- and/or aroma-impermeable properties to the film), ethylene and a-olefin interpolymers (for the glueless lamination of the film on paper), a homopolypropylene modified by maleic anhydride (an adhesive layer in coextrusion films), etc are used as the functional polymers.
• melt flow rate was determined in accordance with ASTM D1238 "Standard test method for melt flow rates of thermoplastics by extrusion plastometer".
• a weight content of the soluble fraction in boiling n-heptane/isotactic fraction was determined according to National State Standard 26996-86. Polypropylene and propylene copolymers.
• a weight content of p-xylene soluble fraction was determined according to ISO 16152.
• MWC molecular weight characteristics
• the microstructure, degree of isotacticity, and ratio of pentads of propylene polymer samples were determined by high resolution carbon nuclear magnetic resonance spectroscopy ( 13 C NMR) using Bruker Avance III 400 MHz instrument.
• 13 C NMR carbon nuclear magnetic resonance spectroscopy
• a sample weighing 250 pg was dissolved in 2.5 ml of trichlorobenzene with heating up to 140°C.
• the number of scans on 13 C nuclei is 16000.
• the temperature of the experiment is 140°C.
• Polypropylene with MFR of 3.2 g/10 min (at 230°C and 2.16 kg) was obtained in a hydrocarbon solvent (heptane) medium according to a three-reactor scheme by mixing in a third reactor a polypropylene with MFR equal to 1.7 g/10 min obtained in a first slurry reactor and a polypropylene with MFR equal to 5.6 g/10 min obtained in a second slurry reactor.
• the propylene polymerization in the solvent medium was performed at a temperature of 68-72°C and operating pressure of 0.50-0.55 MPa.
• the obtained polymer was processed on the line of the firm "Bruckner Maschinenbau GmbH", said line allows to process the polymer at the speed of 450 m/min at the of belt width of 8.2 metres.
• BOPP film represented a five-layer film, each layer of which consists of the aforesaid polypropylene, antioxidants: a spatial-hindered phenolic antioxidant pentaerythritol tetraoxy (3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate) (Irganox 1010) and phosphorus-containing antioxidant tris(2,4-di-tert-butylphenyl)phosphite (Irgafos 168), and also hydrotalcite as an acid scavenger in an amount of 2.19 kg of stabilizers per ton of the polypropylene.
• antioxidants a spatial-hindered phenolic antioxidant pentaerythritol tetraoxy (3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate) (Irganox 1010) and phosphorus-containing antioxidant tris(2,4-di-tert-butylphen
• the film was obtained by the continuous extrusion of polypropylene with a stepwise orientation, heat setting and cooling of the film web: the melt flows of each of the extruders (five - by the number of layers) were connected in a extrusion nozzle (head) and flowed out of its slit onto a cooling drum (roller) in the form of a formed sheet, the sheet was cooled passing through a water bath. Next, the sheet was again heated on calenders to 100-130 ° C and stretched 6 times in the longitudinal direction on the rolls. The sheet elongated in the longitudinal direction was directed to the furnace, where it was again heated with air to 170-190°C and stretched 10 times in the transverse direction. The total film thickness was 20 pm, while outer layers had a thickness of 0.9 mih, the intermediate layers were 2.5 pm, and the thickness of main layer was 13.2 mhi.
• Polypropylene with MFR of 3.2 g/10 min (at 230°C and 2.16 kg) was obtained in a hydrocarbon solvent (heptane) medium according to a single-reactor (standard) scheme.
• the propylene was polymerized in the solvent medium at a temperature of 68- 72°C and operating pressure of 0.50-0.55 MPa.
• BOPP film was obtained by analogy with Example 1, from the propylene polymer with MFR of 3.0 g/10 min (at 230°C and 2.16 kg) synthesized according to gas phase technology, using the catalyst according to Example 1 at a temperature of 65- 75°C and operating pressure of 2.2 MPa.
• BOPP film was obtained by analogy with Example 1, but with the use of commercially available polypropylene Jampilen HP525J (Jam Polymers), obtained at a multi-stage polymerization in a liquid monomer medium that in accordance with the specification from the manufacturer is characterized by a bimodal MWD and is used for producing BOPP films.
• the polymer according to the invention is a propylene homopolymer with a standard melt flow rate (MFR) known in the art and low content of p-xylene soluble (XS) fractions and heptane soluble (HS) fractions, which, in turn, is the consequence of the preparation of the polymer in a hydrocarbon solvent medium.
• MFR melt flow rate
• XS p-xylene soluble
• HS heptane soluble
• Table 1 shows, as the comparison sample, the polypropylene obtained in the hydrocarbon solvent medium according to a single-reactor (standard) scheme (Example 2), there are also characteristics and processing conditions of polypropylenes with high XS and HS content, which are suitable for producing BOPP films: polypropylene obtained by gas phase technology (Example 3), as well as commercially available polypropylene Jampilen HP 525J (Example 4) obtained at the multi-stage polymerization in a liquid monomer medium, not in the hydrocarbon solvent medium. It should be noted that the polymer according to Example 3, as well as according to Example 1, is processed into the film at a speed of 430 m/min, but is characterized by higher rate of breakage.
• the films according to Examples 3 and 4 do not have benefits in appearance and strength characteristics, which limit their use in the manufacture of narrow-purpose films, which are subject of high requirements in respect to physical and mechanical characteristics, in particular for the manufacture of adhesive tape. These films will also be inferior to the film according to Example 1 when printing on them, due to the increased content of migrating low molecular weight components (high XS and HS values ).
• both polymers have different breakage indices expressed as the number of breaks in a certain period of time.
• the breakage rate for the bimodal polymer in contrast to monomodal, is zero, which is associated exactly with the formation of the expanded MWD in the polymer and gives significant benefits over the polymer obtained by the standard scheme, even at the increase in the temperature (Example 2).
• One more positive point is the higher physical, mechanical and optical characteristics (shine) of the finished film as compared to other reference samples, which is the consequence of the low XS content obtained in the hydrocarbon solvent medium.
• the prerequisite is the conduction of polymerization process according to a multi-stage scheme, which, under conditions of producing low XS, will make it possible to obtain the polymer with the required characteristics to ensure a high processing speed and obtain a ready film with improved physical, mechanical and optical characteristics.

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