DD282013A5 - METHOD FOR PRODUCING HIGH-ACTIVE CATALYSTS FOR ETHYLENE POLYMERIZATION OF ULTRAHOCHMOLECULAR POLYETHYLENE - Google Patents

Abstract

The invention relates to a process for the preparation of highly active Ziegler catalysts on organic carrier materials for the production of ultra-high molecular weight polyethylene. The preparation of the supported transition metal component takes place in the single-vessel process, washing, filtration and drying stages being dispensed with. The supported transition metal component is the reaction product of an organic polymer carrier of particular morphology with an organomagnesium complex compound and two different transition metal compounds used in separate steps. One of these compounds is a * and is used as a finely ground homogenate with the functionalized polymer carrier, the other compound, eg. As titanium tetrachloride, is used in admixture with an alkyl polyhalide. {Olefinpolymerisation; Ziegler catalysts; organic carriers; carrier-fixed catalyst; ultra-high molecular weight polyethylene; Einkesselverfahren; Titanium-magnesium complex}

Description

Characteristic of the known state of the art

For the production of ultrahigh molecular weight polyethylene (viscometrically determined molecular weight = 0.5-3 × 10 ⁸ ), the use of mixed catalysts of titanium (III) halides and organoaluminum compounds in a molar ratio of 1: 0.2 to 1 5. Known as DE-AS 2361508 is Al-organyl diethylaluminum chloride which is the use of high-rouge

Ethylene with oxygen contents <1 ppm and the addition of alcohols during the Poilymeristion described in suspension to prevent film formation and caking on the reactor walls. With the same goal and to improve the

Heat removal is according to another known invention with a catalyst of titanium (III) chloride and

Aluminiumtrialkylen with a low partial pressure of inert gas in the polymerization worked (US-PS 3984387).

Also, the production of high molecular weight copolymers of ethylene with mixed catalysts based on titanium (III) chloride is

known. In DE-AS 2555051 and DE-PS 2621404 is proposed, the aktiviiirton catalyst before the polymerization

first pressureless to treat with an α-olefin and to regulate the polymer molecular weight by adding alcohols.

In all the aforementioned inventions titanium trichloride by reacting titanium tetracliloride with

Diethylaluminiurnchlorid prepared and purified by decantation or filtration with hydrocarbons.

According to DD-WP 130 859 and DE-PS 2724096, an increase in the catalytic activity is to be achieved when Al-organyl is a mixture of aluminum alkyls and aluminum alkoxyalkylene. As a transition metal component

Titanium tetrachloride described without isolation of titanium trichloride as an intermediate.

The catalyst activity achieved is so low, according to all inventions referred to above, that on the basis thereof

resulting catalyst residues in polyethylene, the purity requirements for many applications (eg, fibers or surgical implants) are not met. Therefore, expensive purification operations of the polymer powder are required. On

Another disadvantage is that the already difficult to process polymer powder in almost all processes in grain sizes

> 300 μπη accumulates. Before further processing, therefore, complicated grinding processes are required (US Pat. No. 3,847,888).

More recently, mixed catalysts have become known for the production of ultra high molecular weight polyethylene whose transition metal compounds are supported on inorganic materials, especially magnesium chloride. Al-organyl used are aluminum trialkyls. In a group of such inventions, the transition metal component is replaced by

Reaction of titanium tetrachloride with Magnesiumdialkylen, Grignard compounds or magnesium alcoholates produced

(GB-PS 1473092, DE-OS 3120186, DE-OS 3323729). In order to obtain polymers in the molar mass range of 0.5-3 10 ", the polymerization is usually carried out at temperatures S 323 K. In another group of known catalysts, the titanium-magnesium base system is modified with the aim of high polymer molar masses Ethers, alcohols, esters, acetates,

Acid anhydrides or organosilicon compounds have been proposed as additional doping components

(Japanese Laid-Open Patent Publication No. 60106807, Japanese Laid-Open Patent Application No. 61-266414, Japanese Patent Laid-Open No. 6257407, Japanese Patent Laid-Open No. 6257406, Japanese Laid-Open Patent No. 61-266415).

In another known method, an unmodified magnesium-titanium catalyst for producing a mixture of high molecular weight polyethylene (molecular weight> 1.6 × 10 ^e ) and low molecular weight polyethylene has been described

(WO 87/00184). The setting of the molecular weights is carried out by the polymerization in a multi-stage process.

Also known is a carrier-free catalyst of titanium tetrachloride and Aluminiumethylsesquichlorid, in the doping with hexachloroethane and dibutyl ether in heptane polyethylene having a molecular weight of 5.8 -10 ⁶ can be prepared

(Japanese Patent Laid-Open No. 6222808). However, the activity is very low with 2.6 kg PE / g catalyst in 4 hours.

All of the above-mentioned catalysts have deficiencies that lead to increased expense in the polymerization, the

Preparation of the polymer powder, the processing of the polymer powder and in particular lead in the catalyst production itself. Significant deficiencies are specifically low catalyst activity and the resulting necessary

Purification process of polymer powders, the polymerization in multi-stage processes, caking on reactor walls and

required milling processes of polymer powder.

Significant disadvantages of the magnesium-titanium catalysts are their complex manufacturing process. The solid

Magnesium-titanium component is used in several stages, with separation, washing and sometimes even with dry and

Temperierprozessen the intermediates or the final product produced.

Object of the invention

The aim of the invention is to produce highly active catalysts for the polymerization of ethylene to ultrahigh molecular weight polyethylene in a simplified and economical manner.

Explanation of the essence of the invention

The invention has for its object to develop a process for the preparation of highly active catalysts, which allows to carry out the reaction of the starting components in a reactor to the exclusion of separation, washing or drying operations and the resulting supported Üborgangsmetallkomponente in the form of mother liquor suspension of the preparation in the Use polymerization process. The catalysts should allow the production of polyethylene in the molar mass range between 1 to 3 × 10 ^s , wherein due to the high activity and favorable structural parameters of the catalyst subsequent cleaning operations or milling processes of the polymer for Teilchengrößenkorrektur can entfa'ldn.

The object is achieved according to the invention by adding the reaction product of a finely ground mixture of a cyclopdntadienyltitanium (IV) compound and an organic polymer support which contains ring-halogenated or haloalkyl-substituted aromatic structural units in a solvent or solvent mixture with a solvated organomagnesium compound and an aluminum alkyl compound a supported, solvated complex compound of general formula I reacts,

(R _n MgX ₂ · _n ) · (R _m AlY ₃ - J _p (Cp "TiX ₄ _ _q ) · SoIv, (!)

in the

R represents an alkyl, cycloalkyl, aryl, aralkyl, alkaryl or alkenyl radical

Cp Cyplopentadienyl

X halogen

Y represents hydrogen, halogen or alkoxy ligands

η is a numerical value of 1 or 2

m is a numerical value from 1 to 3

ρ is a numerical value from 0.1 to 1

q an integer between "! and4

r is a numerical value from 1 to 2,

SoIv for linear or cyclic ethers, thioethers, tert. Amine, tert. Is phosphine or for other, addition compounds forming each having the same or different substituents,

in a two-step with a mixture of a transition metal compound and a polyhalogenated hydrocarbon of the general formula II

MX "Y _m - _n (R _p CX'4-p) _q (II)

in the

M is a transition metal of IV.-Vl. Subgroup of the PSE means

X, X ', Y are identical or different ligands of the halogen, alkyl, alkenyl, aryl, alkaryl, aralkyl, alkoxy or aroxy type

R represents hydrogen, alkyl, aryl, aralkyl, alkaryl, chloromethyl, dichloromethyl, trichloromethyl or mixed

halogenated methyl or alkyl, the value of the transition metal

η is an integer between Ou id mist,

ρ 0,1,2 or 3secondand

q is a numerical value between 0.1 and 2.0,

is reacted.

This as a component. The solid referred to as the catalyst is in the gram-atom ratio of 1:10 to 1: 500, based on the transition metal, after a special pre-reaction or directly in the polymerization reactor in the presence or absence of the olefin with an organometallic component B, which is a metal I. to IV. main group or II. subgroup of PSE contains, brought to sales.

The amount of solvating agent used for the preparation of component A, preferably tetrahydrofuran, is calculated so that a coordinative saturation of the theoretically independently present individual complexes of magnesium, aluminum and transition / netalls is not achieved.

The amount of aluminum alkyl combined with the organomagnesium compound should be less than 1 equivalent in comparison to this. The transition metal fixed on the catalyst component A can be varied greatly in terms of quantity. Its concentration is generally in the range of 0.1 to 10 parts by mass per 100 parts by mass of the catalyst component A.

The catalyst synthesis is designed as an oil-seed process, so that it carries the greatest possible simplification in its implementation, and corresponds to the fact that the catalyst is present in the form of its mother-liquor suspension with a solids content of 10 to 20 parts by weight per 100 parts by weight after procedural dilution is used.

As starting polymers for the preparation of the organic carrier halogen-containing polystyrene, polyalkylstyrene or their copolymers with mono odar diolefins .. preferably with ethylene, divinylbenzene or Ethyldivinylbenzen be used. The starting polymers are in crosslinked, insoluble form. The organic polymer carrier is used in a grain size of 5 to 50 (im.

The polymerization may be carried out in suspension or in the gas phase at a reaction temperature in the range from 323 to 383 K, the Roactiondruek in the range of 1 to 50 bar and the polymerization is chosen between 0.5 and 10 hours.

The polymerization can also be carried out using comonomers, such as. Propene, butene or higher homologue.

The essential economic advantages of the invention compared to the prior art result from the production technology of the catalyst and from the achievable catalyst quality, which in turn improve the polymerization process and the polymer. It results u.a. the following technological advantages:

- Einkesselvertahren waiving washing, separating or drying operation

- By eliminating washing and separation operations Abproduktfreie Katalysatoi manufacture

- Use of the catalyst in Fo., Ί the production suspension

- High catalyst capacity while maintaining the predetermined Molmasseparamoter and fine PE grain

- Low residual catalyst content in PE-Pulvei, elimination of aftertreatment.

embodiments

example 1

a) Preparation of the titanium-containing catalyst component

4.9 g of magnesium powder are suspended in a solvent mixture of 400 ml of hexane and 22 ml of tetrahydrofuran and reacted with stirring in the boiling heat within 30 minutes - optionally with the aid of a trace of iodine as an initiator - with a total of 25.5 ml of n-butyl chloride. After complete conversion into the organomagnesium compound by refluxing for a further three hours, 30 ml of a triisobutylaluminum are added to the boiling suspension solution. 1 molar hexane solution slowly flow in and heated for a further hour to boiling. Into the suspension cooled to room temperature, 35 g of a dusty poly-p-chloromethylstyrene-benzylbenzene-bis-cyclopentadienyltitanium dichloride titanium titanocene dichloride homogenate prepared by thoroughly inert milling for 3 hours 3 parts by weight of poly-p-chloromethylstyrene-divinylbenzene (25 moles DVB / 100 mol, 9.8 parts by weight CI) / 100 parts by weight) with 1 part by weight titanocene dichloride in the ball mill -, registered. Thereafter, while cooling at room temperature, a solution of 5.5 ml of 1,2-dichloroethane (9 ml of titanium tetrachloride and 150 ml of hexane is added dropwise to the vigorously stirred suspension After the reaction has subsided, the catalyst component is allowed to work for 2 hours to form the catalyst component Boil boiling.

The catalyst component is in suspension as a red-brown powder and is stable indefinitely at room temperature. It is used directly together with the synthesis solution, which has a solids concentration of 10-12 parts by mass / 100 parts by mass suspension.

Analysis of the solid product dried at 373 K in air to constant weight gave the following massile mass per 100 parts by weight: Ti = 4.46; Mg = 5.11; Al = 0.65; Cl = 20.7.

b) polymerization by means of the titanium-containing catalyst component

An agitated autoclave of 21 volumes is charged with 11 parts of hexane, 10% of the catalyst component described above, and 3mmol of triisobutylaluminum as cocatalyst.After pressurizing with 2 bar of ethylene, the mixture is heated to 358K with vigorous stirring by giving in of ethylene at?, set a total pressure of 8 bar, corresponding to an ethylene partial pressure of 2 bar assuming a Hexandampfdnr.kf.s of 0.8 bar overpressure at 358 K. By continuous dosing of the reacted ethylene as well as continuously adjusted cooling, the conditions during the test period After 1 hour, the polymerization reaction is stopped by blocking the ethylene feed and cooling, the autoclave is depressurized and its oil is filtered I. The yield of air-dry polyethylene is 276.7 g, giving a gross conversion rate of r <35.8 kgPE / gTi h. ethylene or 12.75 kg PE / g cat. · h · bar ethylene Viscosimetric determination of molecular weight gave an Mw of 1.68 x 10 ⁶ g / mol.

Example 2

a) Preparation of the titanium-containing catalyst component

The preparation of the catalyst component is carried out according to the procedure of Example 1.1m, but now 40 g of the poly-p-chloromethylstyrene-divinylbenzene titanocene dichloride powder and 3.3 ml of titanium tetrachloride are used, so that a molar ratio of Titanocendichlcrid to titanium tetrachloride as 1 to 0.75. The analysis of the dry catalyst component has: Ti = 4.31; Mg = 5.22; Al = 0.61; Cl = 21.0 parts by weight based on 10u parts by weight.

b) polymerization

The polymerization carried out in accordance with Example 1 with 9.35 mg of the above catalyst component and 3 mmol of triisobutylaluminum for activation leads within one hour to the production of 194.7 g of polyethylene, corresponding to a gross conversion rate of 241.6 kg PE / g Ti · h · bar of ethylene or 10, 41 kg PE / g cat. · H · bar ethylene. Mw = 1.87-10 ⁶ g / mol.

Example 3

a) Preparation of the titanium-containing catalyst component

20 g feinstvermahlenes (particle size <50μπι), absolutely dry poly-p-chloromethylstyrene-divinylbenzene (DVB and Cl content as in Example 1) and 4.9 g of magnesium powder are suspended in a mixed solution of 400 ml of hexane and 22 ml of tetrahydrofuran. After adding about one third of the total 25.5 ml of n-butyl chloride, the mixture is heated to boiling while stirring. Once the reaction has started - with advantage by initiation by means of a trace of iodine - the remainder of the butyl chloride is added dropwise, so that the boiling point is determined solely by the reaction temperature

is maintained. After the addition, the reflux is continued until the magnesium is completely consumed, normally about 3 hours. Thereafter, 30 mmol of triisobutylaluminum dissolved in 30 ml of hexane are allowed to flow slowly into the boiling suspension and heated to boiling for an additional hour.

Thereafter, 20 g of the described in Example 1 poly-p-chloromethylstyron-divinylbenzen-Titanocendichlorid powder are added to the cooled to room temperature, vigorously stirred reaction mixture and then under cooling at room temperature, a solution consisting of 4.4 ml Titantelrachloricl and 4.0 ml , 2-dichloroethane in 150 ml of hexane, added dropwise within 30 minutes, so that a titanium tetrachloride titanocene dichloride ratio of 1 to 0.5 mol results. It is then heated in the course of 30 minutes to boiling and allowed to reflux for 2 hours. After completion of the complex formation, a substance sample is taken, dried sharply and analyzed:

Ti = 3.79; Mg = 5.82; Al = 0.58; Cl = 21.1 parts by weight per 100 parts by weight.

b) polymerization

The polymerization is carried out according to Example 1.8.89 mg of the above catalyst components, activated with 3 mmol of triisobutylaluminum, produce 179.6 g of polyethylene in 1 hour, which corresponds to a gross conversion rate of 266.5 kg PE / g Ti h bar ethylene or 10.10 kg PE / g cat. H bar corresponds to ethylene. Mw = 1.42 x 10 ^e g / mol.

Example 4

a) Preparation of the titanium-containing catalyst component

The procedure for the preparation of the catalyst component corresponds to Example 3, but with the difference that the Grignard reagent in counterword of 10 g poly-p-chloromethylstyrene-divinyl bonzen (5 moles DVB / 1 OOmol, 13.5 parts by mass CI / 100 parts by mass) is generated. All further reactions were carried out with the same amounts of substance (20 g of poly-p-chloromethyl-styrene-divinylbenzene-titanocene dichloride powder, 4.4 ml of titanium tetrachloride and 4.8 ml of 1,2-dichloroethane) and under the same reaction conditions.

A sample dried at 373 K in the air to constant weight gave the following analytical values:

Ti = 4.45; Mg = 6.70; Al = 0.81; Cl = 21.1 parts by weight per 100 parts by weight.

b) polymerization

Under the Polymeristionsbedingungen according to Example 1 form with HiI ^: e of 10.11 mg of the above catalyst component and 3 mmol of triisobutylaluminum as co-catalyst within 1 hour 243.2 g of polyethylene. This yield corresponds to a gross conversion rate of 270.2 kg PE / g Ti · h · bar ethylene or 12,028 kg PE / g cat · h bar ethylene. Mw = 1.37 x 10 ^e g / mol.

Example 5

a) Preparation of the titanium-containing catalyst component

The preparation of the catalyst component corresponds with respect to the amounts used of support material, Grignard reagent and Titanocendichlorid given in Example 3 rule. In contrast, the proportion of titanium tetrachloride and of 1,2-dichloroethane is quantitatively changed. The two last-mentioned compounds are used in each case in the same amount of 5.5 ml, dissolved in 150 ml of hexane, so that the catalyst component titanium tetrachloride and Titanocendichlorid in a molar ratio of 1 to 0.4

 Analysis of the solid dried at 373 K in the air: Ti = 4.38; Mg = 6.57; Al = 0.72, Cl = 21.4 parts by mass / 100 parts by mass.

b) Polymerization

The polymerization is carried out according to Example 1. 9.93 mg of the above catalyst component, activated by 3 mmol of triisobutylaluminum, produces 211.8 g of polyethylene in 1 hour, which gives a gross conversion rate of 243.4 kg / g Ti · h · bar of ethylene or 10.665 kg of PE / g of cat · h · bar Corresponds to ethylene. Mw = 2.15 x 10 ^e g / mol.

Examples

a) Preparation of the titanium-containing catalyst component

The preparation of the catalyst component is carried out as described at the beginning of Example 3. However, 30 g of poly-p-chloromethylstyrene-divinylbenzene (10 mol DVB / 100 mol, 12.5 mass parts of CI / 100 mass parts, particle size <30 pm) and 7.57 ml of triisobutylaluminum in 430 ml of hexane are used. In the subsequent synthesis step, 10 g of the poly-p-chloromethylstyrene-divinylbenzene titanocene dichloride homogenate described in Example 1 and then 6.6 ml of titanium tetrachloride and E, 5 ml of 1,2-dichloroethane, dissolved in 150 ml of hexane, are slowly added under the usual conditions added. The molar ratio of titanium tetrachloride / titanocene dichloride is thus 6: 1. Analysis of the catalyst component dried in air at 373K: Ti = 4.21; Mg = 5.70; Al = 0.47; Cl = 19.2 parts by mass / 100 parts by mass.

b) polymerization

The Polymeristion was carried out according to Example 1. After activation with 3 mmol of triisobutylaluminum, 11.15 mg of the above catalyst component give, within 1 hour, 200.8 g of polyethylene, corresponding to a gross conversion rate of 214.1 kg PE / g Ti · h · bar ethylene or 9.00 kg PE / g cat · h bar ethylene. Mw = 1.12-10 ^e g / mol.

Example 7

a) Horc'jjjung of the Ti & n containing catalyst component

The process for the preparation of the catalyst component corresponds, except for the organopolyhalogen compound to be used, in all the details of the procedure given in Example 3. The intended change is made on the synthesis stage of the titanium tetrachloride doping, where instead of the usual 1,2-dichloroethane now tetrachloromethane as complex activating reagent in an amount of 6.6 ml is used. After complex formation under the reaction conditions described above, a sample of the solid product is air-dried at 373K and analyzed:

Ti = 3.88; Mg = 5.28; Al = 0.54; Cl = 21.9 parts by mass / 100 parts by mass.

b) polymerization

The polymerization is carried out according to Example 1 a. 9.12 mg of the above catalyst component,

activated with 3mmol triisobutyaluminum, in actual reaction 185,2g polyethylene, corresponding to one

Gross cumulative viscosity of 261.6 kg PE / g Ti · h · bar ethylene or 10.15 kg PE / g cat · h · bar ethylene.

Mw = 1.94 '10VmOl.

Cross-reference A

a) Preparation of the titanium-containing catalyst component

In contrast to the Beisaieli-nv / rd so far the catalyst component prepared without the use of titanium tetrachloride. Out; For this reason, the organo-magnesium-aluminum halide compound as in Example 1 is first prepared in the absence of the organic carrier. According to the rule given there, the further reaction takes place, however, with 40 g of the described poly-p-ch! O. ethylstyrene-divinylbenzene-titanocene dichloride homogenate and 4.8m! 1,2-dichloroethane. Formation dewaxing by reflux cooking is extended to 6 hours in this particular case

 Analytical values of the catalyst component dried to constant weight: Ti = 2.59; Mg = 7.10; Al = 0.68; C = 20.4% by mass / 100 parts by mass

b) Polymeriston

The example of Example 1 mi. 1.70 mg of the η catalyst component and smmolTriteobutylaluminum as a cocatalyst durr.tgouihrte polymerization attempt leaves trot. Extension of the reaction time to 3 hours polyethylene only in traces arise

 Fatty game B

a) Manufacture;, 5 of the titanium-containing catalyst component

The substance sample ineffective in Example A, inactive catalyst component is additionally doped with 2.2 ml Titantel'achlorid in their total mass under cooling and heated under intensive mixing for 1 hour at reflux. Analysis of the product, dried at 373 K in the air and containing per mole of titanocene dichloride now 0.5 mole of titanium tetrachloride, gave: Ti = 4.00; Mg = 6.62; Al = 0.63; Cl = 21.3 parts by mass / 100 parts by mass.

b) polymerization

The polymerization was carried out under the conditions of Example 1 in M. 1.00 mg of the above catalyst component and 3 mmol of triisobutylaluminum as cocatalyst. After 1 hour, 202.8 g of polyethylene had been produced, which corresponds to a gross conversion rate of 230.5 kg PE / g of TiHbar ethylene or 9.22 kg PE / g of catalytically stable ethylene

Mw = 1.94 x 10 ^e g / mol.

Claims (5)

1. A process for the preparation of highly active modified catalysts for the ethylene polymerization to ultra high molecular weight polyethylene, consisting of an organometallic component B and a solid catalyst component A, characterized in that the component A is formed from the reaction product of a finely ground mixture of a titanium (IV) - Compound having cyclopentadienyl ligands and an organic polymer yield ·· containing aromatic ring moieties substituted with haloalkyl radicals in (in a solvent comprising a solvated organomagnesium compound and an organoaluminum compound to produce a solvated complex of general formula I, (R _n MgX ₂ - _n ) · (R ₀₁ AlY ₃ - J _p · (CpJi x ₄ _ _q ) · solv _r (I) in the R represents an alkyl, cycloalkyl, aryl, aralkyl, alkaryl or alkenyl radical Cp cyclopentadienyl X halogen Y represents hydrogen, halogen or alkoxy ligands, η is a numerical value of 1 or 2 q is an integer between 1 and 4 and m is a number from 1 to 3 ρ is a numerical value from 0.1 to 1 r is a numerical value of 1 to 2, SoIv for linear or cyclic ethers, thioethers, tert.Amin, tert. Is phosphine or for other, addition compounds forming each having the same or different substituents, in a second step with a mixture of transition metal compound and Polyhalogenkohlenwasserstcff the general formula II, MX _n Y _m _ _n - (R _p CX _'4 _ _{p) q} (II) in the M is a transition metal of the IV., V. or Vl. Subgroup of the PSE means X, X ', Y are identical or different ligands of the type halogen, alkyl, alkenyl, aryl, alkaryl, Aralkyl, alkoxy or aroxy
, R is hydrogen, alkyl, aryl, aralkyl, alkaryl, chloromethyl, dichloromethyl, trichloromethyl or mixed halqgeniertes methyl or alkyl m is the valency of the transition metal η is an integer between 0 and mist ρ can be 0,1,2 or 3 and q is a numerical value between 0.1 and 2.0, is implemented. 2. The method according to claim 1, characterized in that the organic polymer support is based on polystyrene, polyalkylstyrene or their copolymers with mono- and diolefins and has a particle size S 30μιη. 3. The method according to claim 2, characterized in that the organic polymer support is based on copolymers of styrene, alkyl styrene with ethylene, divinylbenzene and Ethyldivinylbenzen. 4. The method according to claim 1, characterized in that the cyclopentadienyl titanium compound is used only in admixture with the halogenated organic carrier. 5. The method according to claim 2, characterized in that up to 60 parts by mass, based on
100 parts by mass of the organic carrier, already during the formation of the solvated
may be present organomagnesium compound. Field of application of the invention The invention relates to a process for the preparation of highly active catalysts for ethylene polymerization
ultra high molecular weight polyethylene used as a raw material for the production of high modulus materials or
impacted parts in the textile industry and medical implants can be used.