EP0000025B1 - Use of a special polyolefine composition for the production of films by the blow-moulding process - Google Patents

Use of a special polyolefine composition for the production of films by the blow-moulding process Download PDF

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Publication number
EP0000025B1
EP0000025B1 EP78100040A EP78100040A EP0000025B1 EP 0000025 B1 EP0000025 B1 EP 0000025B1 EP 78100040 A EP78100040 A EP 78100040A EP 78100040 A EP78100040 A EP 78100040A EP 0000025 B1 EP0000025 B1 EP 0000025B1
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French (fr)
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EP0000025A1 (en
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Rudolf Dr. Glaser
Frank Dr. Weiss
Dieter Dipl.-Ing. Cramer
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Novartis AG
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Ciba Geigy AG
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/49—Phosphorus-containing compounds
    • C08K5/51—Phosphorus bound to oxygen
    • C08K5/52—Phosphorus bound to oxygen only
    • C08K5/524—Esters of phosphorous acids, e.g. of H3PO3
    • C08K5/526—Esters of phosphorous acids, e.g. of H3PO3 with hydroxyaryl compounds
    • 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
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/06—Polyethene
    • 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
    • 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

Definitions

  • the present invention relates to the use of a special polyolefin molding composition for the production of 10 to 500, in particular 10 to 80 and especially 10 to 30, thick biaxially stretched films by the film blowing process with an inflation ratio of up to 1:10 and in particular 1: 2 to 1: 7.
  • foil blowing process generally succeeds without particular difficulty with the corresponding polyolefin molding compositions, which means according to the Ziegler method based on a titanium-containing catalyst-produced polyethylene, while molding compounds based on a polyethylene produced according to Phillips, ie with a chromium-containing catalyst, result in increasing difficulties in their production with decreasing thickness of the films.
  • the task of the present invention was to demonstrate a molding compound based on Phillips polyethylene, which is suitable for producing qualitatively satisfactory films, including thin and very thin films, by the film blowing process.
  • the molding compositions to be used according to the invention can be produced from their components in conventional mixing devices in a customary manner; it has no special features per se and therefore does not require any further explanation.
  • a tube is extruded from this molding compound by means of an excess film blowing device (diameter of the ring die: 100 mm; die gap: 0.8 mm) at a melt temperature of approximately 250 ° C. and inflated in a ratio of 1: 5.
  • the take-off speed is chosen so that a 20 ⁇ m thick biaxially stretched film results; it is well suited for the production of bags and carrier bags.
  • a tube is extruded from this molding compound using a conventional film blowing device (diameter of the ring die: 100 mm; die gap: 0.8 mm) at a melt temperature of about 230 ° C. and inflated in a ratio of 1: 3.5.
  • the take-off speed is selected so that a film 10 mm thick - biaxially stretched - results; it works well as a wrapping film.

Description

Die vorliegende Erfindung betrifft die Verwendung einer speziellen Polyolefin-Formmasse zum Herstellen von 10 bis 500,- insbesondere 10 bis 80 und vor allem 10 dis 30 ,um dicken biaxial verstreckten Folien nach dem Folienblasverfahren mit einem Aufblasverhältnis bis zu 1:10 und insbesondere 1:2 bis 1:7.The present invention relates to the use of a special polyolefin molding composition for the production of 10 to 500, in particular 10 to 80 and especially 10 to 30, thick biaxially stretched films by the film blowing process with an inflation ratio of up to 1:10 and in particular 1: 2 to 1: 7.

Das Herstellen solcher-qualitativ zufriedenstellender-Folien, auch dünner und sehr dünner Folien (wie sie z.B. als Einwickelfolien oder Folien für Beutel gängig sind), nach dem Folienblasverfahren gelingt im allgemeinen ohne besondere Schwierigkeiten mit entsprechenden Polyolefin-Formmassen denen ein nach Ziegler-also mittels eines Titan enthaltenden Katalysators-hergestelltes Polyäthylen zugrundeliegt, während sich bei Formmassen, die auf einem nach Phillips-also mittens eines Chrom enthaltenden Katalysators-hergestellten Polyäthylen basieren, mit abnehmender Dicke der Folien zunehmende Schwierigkeiten bei deren Herstellung ergeben. Diese Schwierigkeiten haben es bislang nicht gestattet, wünschenswert dünne und qualitativ zufriedenstellende Folien (wie sog. "Papier"-oder "Raschei"- Folien) nach dem Folienblasverfahren aus Formmussen herzustellen, deren Polyolefin ein Phillips-Polyäthylen ist.The production of such qualitatively satisfactory foils, including thin and very thin foils (such as are common, for example, as wrapping foils or foils for bags), by the foil blowing process generally succeeds without particular difficulty with the corresponding polyolefin molding compositions, which means according to the Ziegler method based on a titanium-containing catalyst-produced polyethylene, while molding compounds based on a polyethylene produced according to Phillips, ie with a chromium-containing catalyst, result in increasing difficulties in their production with decreasing thickness of the films. These difficulties have not hitherto permitted the desirably thin and qualitatively satisfactory foils (such as so-called "paper" or "Raschei" foils) to be produced by molding from a mold, the polyolefin of which is a Phillips polyethylene.

Die Möglichkeit des Einsatzes auch solcher Polyäthylene auf dem in Rede stehenden Gebiet wäre indes erwünscht, da Ziegler-Polyäthylene anderweit problematischer sind, z.B. bei der nötigen Stabilisierung gegen Schädigung durch UV-Licht oder Sauerstoff.However, the possibility of using such polyethylenes in the field in question would also be desirable, since Ziegler polyethylenes are otherwise more problematic, e.g. with the necessary stabilization against damage by UV light or oxygen.

Aufgabenstellung zur vorliegenden Erfindung was as dementsprechend, eine auf Phillips-Polyäthylen basierende Formmasse aufzuzeigen, die sich zum Herstellen qualitativ zufriedenstellender Folien, auch dünner und sehr dünner Folien, nach dem Folienblasverfahren eignet.Accordingly, the task of the present invention was to demonstrate a molding compound based on Phillips polyethylene, which is suitable for producing qualitatively satisfactory films, including thin and very thin films, by the film blowing process.

Wie sich ergeben hat, ist die Lösung dieser Aufgabe möglich mit Formmassen aus einer speziell ausgewählten Art von Phillips-Polyäthylen und iener speziell ausgewählten Additiv-Kombination, die aus

  • (i) einem andersartigen Polyäthylen und
  • (ii) einem besonderen Phosphit besteht.
As has been found, the solution to this problem is possible with molding compositions made from a specially selected type of Phillips polyethylene and a specially selected additive combination
  • (i) a different type of polyethylene and
  • (ii) there is a special phosphite.

Gegenstand der vorliegenden Erfindung ist dementsphrechend die Verwendung einer Formmasse aus

  • (1) 100 Gewichtsteilen eines Polyäthylens, das
    • (1.1) mittels eines Chrom enthaltenden Katalysators hergestellt ist,
    • (1.2) eine Dichte von über 0,945, insbesondere von 0,950 bis 0,960 g/cm3 hat,
    • (1.3) einen Schmelzindex (nach DIN 53 735 bie 190°C/2,16 kg) von kleiner 0,7 g/10 min aufweist und
    • (1.4) eine Lösungsviskosität (nach DIN 53 728/Blatt 4) von 1 bis 5 cm3/g besitzt.
  • (2) 1 bis 30 Gewichtsteilen eines Polyäthylens, das
    • (2.1) eine Dichte von 0,940 bis 0,968 g/cm3 hat und
    • (2.2) einen Schmelzindex (nach DIN 53 735 bie 190°C/2,16 kg) von 0,9 bis 20 g/10 min aufweist,
  • (3) 0,05 bis 1, insbesondere 0,1 bis 0,5 Gewichtsteilen eines Tris-(2,4-dialkylphenyl)-phosphits, wobei die Alkylgruppen gleich oder verschieden sind und jeweils 1 bis 9 Kohlenstoffatome enthalten, sowie
  • (4) - gegebenenfalls - einschlägig üblichen anderen Additiven in einschlägig üblichen Mengen,
zum Herstellen von 10 bis 500, insbesondere 10 bis 80 und vor allem 10 bis 30 jum dicken biaxial verstreckten Folien nach dem Folienblasverfahren mit einem Aufblasverhältnis bis zu 1:10 und insbesondere von 1:2 bis 1:7.The present invention accordingly relates to the use of a molding compound
  • (1) 100 parts by weight of a polyethylene which
    • (1.1) is produced by means of a chromium-containing catalyst,
    • (1.2) has a density of over 0.945, in particular from 0.950 to 0.960 g / cm 3 ,
    • (1.3) has a melt index (according to DIN 53 735 at 190 ° C / 2.16 kg) of less than 0.7 g / 10 min and
    • (1.4) has a solution viscosity (according to DIN 53 728 / sheet 4) of 1 to 5 cm 3 / g.
  • (2) 1 to 30 parts by weight of a polyethylene which
    • (2.1) has a density of 0.940 to 0.968 g / cm 3 and
    • (2.2) has a melt index (according to DIN 53 735 at 190 ° C / 2.16 kg) of 0.9 to 20 g / 10 min,
  • (3) 0.05 to 1, in particular 0.1 to 0.5 parts by weight of a tris (2,4-dialkylphenyl) phosphite, the alkyl groups being identical or different and each containing 1 to 9 carbon atoms, and
  • (4) - if appropriate - other additives which are customarily used in the relevant quantities,
for the production of 10 to 500, in particular 10 to 80 and especially 10 to 30 μm thick biaxially stretched films by the film blowing process with an inflation ratio of up to 1:10 and in particular from 1: 2 to 1: 7.

Zur stofflichen Seite des Erfindungsgegenstandes ist im einzelnen das folgende zu sagen:

  • (1) Die einzusetzenden Polyäthylene der Art (1) sind an sich bekannt und im Handel erhältlich, so daß sich nähere Ausführungen zu ihnen erübrigen. Zu bemerken ist jedoch, daß sich zweierlei gazeigt hat:
    • (a) Besonders gut geeignet sind Polyäthylene, die Schmelzindices (nach DIN 53 735 bei 190°C/2,16 kg) von 0,1 bis 0,6 g/10 min aufweisen und Lösungsviskositäten (nach DIN 53 728/Blatt 4) von 1,8 bis 2,6 cm3/g besitzen. Solche Polyäthylene lassen sich z.B. bevorzugt zum Herstellen von Folien für Einwickelzwecke verwenden.
    • (b) Besonders gut geeignet sind auch Polyäthylene, die Schmelzindices (nach DIN 53 735 bei 190°C/21, 6 kg) von 6 bis 20 g/10 min aufweisen und Lösungsviskositäten (nach DIN 53 728/Blatt 4) von 2,7 bis 4,0 cm3/g besitzen. Solche Polyäthylene lassen sich z.B. bevorzugt verwenden zum Herstellen von Folien für Tüten, Tragebeutel, Säcke und Web- oder Klebebänder sowie zum Kaschieren: die Folien haben eine hohe Festigkeit und Schockzähigkeit; sie eignen sich auch als Schrumpffolien.
  • (2) Auch die einzusetzenden Polyäthylene der Art (2) sind an sich bekannt und im Handel erhältlich, so daß sich zu ihnen ebenfalls nähere Ausführungen erübrigen. Zu bemerken ist hier, daß sich wiederum zweierlei gezeigt hat:
    • (A) Besonders gut geeignet sind Polyäthylene, die einen Schmelzindex (nach DIN 53 735 bei 190°C/2,16 kg) von 1,0 bis 2,5 g/10 min aufweisen; diese Polyäthylene werden zweckmäßigerweise eingesetzt in Mengen von 10 bis 25 Gewichtsteilen pro 100 Gewichtsteilen des Polyäthylens der Art (1 ).
    • (B) Besonders gut geeignet sind auch Polyäthylene, die einen Schmelzindex (nach DIN 53 735 bei 190°C/2,16 kg) von 5 bis 12 g/10 min aufweisen; diese Polyäthylene werden zweckmäßigerweise eingesetzt in Mengen von 3 bis 15 Gewichtsteilen pro 100 Gewichtsteilen des Polyäthylens der Art (1).
  • (3) Als Tris-(2,4-dialkylphenyl)-phosphite kommen vornehmlich solche in Betracht, deren Alkylgruppen verzweigt sind; die Alkylgruppen sind vorzugsweise verzweigte, 3 bis 5 Kohlenstoffatome enthaltende. Besonders gut geeignet ist das Tris(2,4-di-tert.-butylphenyl)-phosphit.
  • (4) Im Rahmen des Erfindungsgegenstandes können - gewünschtenfalls - übliche andere Additive, also Hilfs- und Zusatzstoffe, in einschlägig üblichen Mengen mitverwendet werden. Zu nennen sind beispielsweise Verarbeitungshilfsmittel wie insbesondere Metallstearate, etwa Calcium-, Zink- oder Kaliumstearat (in Mengen von 0,02 bis 0,5 Gewichtsteilen pro 100 Gewichtsteilen Polyäthylen); Antioxidantien, wie phenolische Stoffe, etwa Pentaerythrityltetrakis [3 - (3,5 - di - tert. - butyl - 4 - hydroxyphenyl) - propionat] oder Octadecyl - 3-(3,5 - di - tert. - butyl - 4 - hydroxyphenyl)-propionat (in Mengen von 0,01 bis 0,2 Gewichtsteilen pro 100 Gewichtsteilen Polyäthylen); Antiblockmittel, wie Siliciumdioxid (in Mengen von 0,05 bis 0,5 Gewichtsteilen pro 100 Gewichtsteilen Polyäthylen); ferner Antistatika, Pigmente, Füllstoffe und Nucleierungsmittel.
On the material side of the subject matter of the invention, the following can be said in detail:
  • (1) The polyethylenes of type (1) to be used are known per se and are commercially available, so that further explanations on them are unnecessary. However, it should be noted that two things have been shown:
    • (a) Polyethylenes which have melt indices (according to DIN 53 735 at 190 ° C / 2.16 kg) of 0.1 to 0.6 g / 10 min and solution viscosities (according to DIN 53 728 / sheet 4) are particularly suitable. from 1.8 to 2.6 cm 3 / g. Such polyethylenes can be used, for example, preferably for the production of films for wrapping purposes.
    • (b) Polyethylenes which have melt indices (according to DIN 53 735 at 190 ° C / 21.6 kg) of 6 to 20 g / 10 min and solution viscosities (according to DIN 53 728 / sheet 4) of 2 are also particularly suitable. 7 to 4.0 cm 3 / g. Such polyethylenes can preferably be used, for example, to produce films for bags, carrier bags, sacks and woven or adhesive tapes, and for laminating: the films have high strength and shock resistance; they are also suitable as shrink films.
  • (2) The polyethylenes of the type (2) to be used are also known per se and are commercially available, so that further explanations on them are also unnecessary. It should be noted here that two things have been shown:
    • (A) Polyethylenes which have a melt index (according to DIN 53 735 at 190 ° C / 2.16 kg) of 1.0 to 2.5 g / 10 min are particularly suitable; these polyethylenes are expediently used in amounts of 10 to 25 parts by weight per 100 parts by weight of the polyethylene of the type (1).
    • (B) Polyethylenes which have a melt index (according to DIN 53 735 at 190 ° C / 2.16 kg) of 5 to 12 g / 10 min are also particularly suitable; these polyethylenes are expediently used in amounts of 3 to 15 parts by weight per 100 parts by weight of the polyethylene of the type (1).
  • (3) Suitable tris (2,4-dialkylphenyl) phosphites are primarily those whose alkyl groups are branched; the alkyl groups are preferably branched, containing 3 to 5 carbon atoms. Tris (2,4-di-tert-butylphenyl) phosphite is particularly suitable.
  • (4) Within the scope of the subject matter of the invention, customary other additives, that is to say auxiliaries and additives, can be used in the usual amounts, if desired. Examples include processing aids such as, in particular, metal stearates, such as calcium, zinc or potassium stearate (in amounts of 0.02 to 0.5 parts by weight per 100 parts by weight of polyethylene); Antioxidants, such as phenolic substances, for example pentaerythrityl tetrakis [3 - (3,5-di-tert-butyl-4-hydroxyphenyl) propionate] or octadecyl-3- (3,5-di-tert-butyl-4-hydroxyphenyl) ) -propionate (in amounts of 0.01 to 0.2 parts by weight per 100 parts by weight of polyethylene); Antiblocking agents such as silica (in amounts of 0.05 to 0.5 parts by weight per 100 parts by weight of polyethylene); also antistatic agents, pigments, fillers and nucleating agents.

Das Herstellen der erfindungsgemäß zu verwendenden Formmassen aus ihren Komponenten kann in einschlägig üblichen Mischvorrichtungen in einschlägig üblicher Weise erfolgen; es ist an sich mit keinen Besonderheiten verbunden und bedarf daher keiner näheren Erläuterung.The molding compositions to be used according to the invention can be produced from their components in conventional mixing devices in a customary manner; it has no special features per se and therefore does not require any further explanation.

Sinngemäß das gleiche gilt für das Herstellen der Folien aus den erfindungsgemäß zu verwendenden Formmassen, denn das Folienblasverfahren als solches ist in der Praxis wohl eingeführt und in der Literatur vielfach beschrieben, z.B. in den Aufsätzen von G. Prall in "Modern Plastics", Band 47 (1970), Heft 5, Seiten 90 bis 92 oder von S. Heimlich, in "Industrieanzeiger", Band 94 (1972), Nr. 97, Seiten 2332 bis 2336 oder in dem Buch "Extrudieren von Schlauchfolien", VDI-Verlag GmbH, 1973, insbesondere Seiten 193 bis 230.The same applies analogously to the production of the films from the molding compositions to be used according to the invention, since the film blowing process as such is well established in practice and has been widely described in the literature, e.g. in the articles by G. Prall in "Modern Plastics", volume 47 (1970), number 5, pages 90 to 92 or by S. Heimlich, in "Industrieanzeiger", volume 94 (1972), No. 97, pages 2332 to 2336 or in the book "Extrusion of tubular films", VDI-Verlag GmbH, 1973, in particular pages 193 to 230.

BEISPIEL 1EXAMPLE 1

Es wird verwendet eine Formmasse aus

  • (1) 100 Gewichtsteilen eines Polyäthylens, das
    • (1.1) mittels eines Chrom enthaltenden Katalysators hergestellt ist,
    • (1.2) eine Dichte von 0,954 g/cm3 hat,
    • (1.3) einen Schmelzindex (nach DIN 53 735 bei 190°C/21,6 kg) von 9,1 g/10 min aufweist und
    • (1.4) eine Lösungsviskosität (nach DIN 53 728/Blatt 4) von 3,4 cm3/g besitzt.
  • (2) 10 Gewichtsteilen eines Polyäthylens, das
    • (2.1) eine Dichte von 0,961 g/cm3 hat und
    • (2.2) einen Schmelzindex (nach DIN 53 735 bei 190°C/2,16 kg) von 8 g/10 min aufweist,
  • (3) 0,2 Gewichtsteilen Tris-(2,4-di-tert.-butylphenyl)-phosphit, sowie
  • (4) 0,4 Gewichtsteilen Calciumstearat.
A molding compound is used
  • (1) 100 parts by weight of a polyethylene which
    • (1.1) is produced by means of a chromium-containing catalyst,
    • (1.2) has a density of 0.954 g / cm 3 ,
    • (1.3) has a melt index (according to DIN 53 735 at 190 ° C / 21.6 kg) of 9.1 g / 10 min and
    • (1.4) has a solution viscosity (according to DIN 53 728 / sheet 4) of 3.4 cm 3 / g.
  • (2) 10 parts by weight of a polyethylene which
    • (2.1) has a density of 0.961 g / cm 3 and
    • (2.2) has a melt index (according to DIN 53 735 at 190 ° C / 2.16 kg) of 8 g / 10 min,
  • (3) 0.2 parts by weight of tris (2,4-di-tert-butylphenyl) phosphite, and
  • (4) 0.4 parts by weight of calcium stearate.

Aus dieser Formmasse wird mittels einer überlichen Folienblasvorrichtung (Durchmesser der Ringdüse: 100 mm; Düsenspalt: 0,8 mm) bei einer Massetemperatur von etwa 250°C ein Schlauch extrudiert und im Verhältnis 1:5 aufgeblasen. Die Abzugsgeschwindigkeit wird so gewählt, daß eine 20 um dicke - biaxial verstreckte - Folie resultiert; sie eignet sich gut zum Herstellen von Beuteln und Tragetaschen.A tube is extruded from this molding compound by means of an excess film blowing device (diameter of the ring die: 100 mm; die gap: 0.8 mm) at a melt temperature of approximately 250 ° C. and inflated in a ratio of 1: 5. The take-off speed is chosen so that a 20 μm thick biaxially stretched film results; it is well suited for the production of bags and carrier bags.

BEISPIEL 2EXAMPLE 2

Es wird verwendet eine Formmasse aus

  • (1) 100 Gewichtsteilen eines Polyäthylens. das
    • (1.1) mittels eines Chrom enthaltenden Katalysators hergestellt ist,
    • (1.2) eine Dichte von 0,954 g/ch3 hat,
    • (1.3) einen Schmelzindex (nach DIN 53 735 bei 190°C/21,6 kg) von 9,1 g/1 0 min aufweist und
    • (1.4) eine Lösungsviskosität (nach DIN 53728/Blatt 4) von 3,4 cm3/g besitzt,
  • (2) 15 Gewichtsteilen eines Polyäthylens, das thylens, das
    • (2.1) eine Dichte von 0,961 g/cm3 hat und
    • (2.2) einen Schmelzindex (nach DIN 53 735 bei 190°C/2,16 kg) von 1,6 g/10 min aufweist.
  • (3) 0,2 Gewichtsteilen Tris-(2,4-di-tert.-butylphenyl)-phosphit, sowie
  • (4) 0,4 Gewichtsteilen Calciumstearat.
A molding compound is used
  • (1) 100 parts by weight of a polyethylene. the
    • (1.1) is produced by means of a chromium-containing catalyst,
    • (1.2) has a density of 0.954 g / ch 3 ,
    • (1.3) has a melt index (according to DIN 53 735 at 190 ° C / 21.6 kg) of 9.1 g / 10 min and
    • (1.4) has a solution viscosity (according to DIN 53728 / sheet 4) of 3.4 cm 3 / g,
  • (2) 15 parts by weight of a polyethylene, the ethylene, the
    • (2.1) has a density of 0.961 g / cm 3 and
    • (2.2) has a melt index (according to DIN 53 735 at 190 ° C / 2.16 kg) of 1.6 g / 10 min.
  • (3) 0.2 parts by weight of tris (2,4-di-tert-butylphenyl) phosphite, and
  • (4) 0.4 parts by weight of calcium stearate.

Aus dieser Formmasse wird mittels einer üblichen Folienblasvorrichtung (Durchmesser der Ringdüse: 100 mm; Düsenspalt: 0,8 mm) bei einer Massetemperatur von etwa 230°C ein Schlauch extrudiert und im Verhältnis 1:3,5 aufgeblasen. Die Abzugsgeschwindigkeit wird so gewählt, daß eine 10 jum dicke - biaxial verstreckte - Folie resultiert; sie eignet sich gut als Einwickelfolie.A tube is extruded from this molding compound using a conventional film blowing device (diameter of the ring die: 100 mm; die gap: 0.8 mm) at a melt temperature of about 230 ° C. and inflated in a ratio of 1: 3.5. The take-off speed is selected so that a film 10 mm thick - biaxially stretched - results; it works well as a wrapping film.

Claims (1)

  1. Use of a molding composition consisting of
    (1) 100 parts by weight of a polyethylene which
    (1.1) has been produced with the aid of a chromium-containing catalyst,
    (1.2) has a density of more than 0.945 g/cm3,
    (1.3) has a melt index (according to DIN 53,735 at 190°C/2.16 kg) of less than 0.7 g/10 min., and
    (1.4) has a solution viscosity (according to DIN 53,728, Sheet 4) of 1 to 5 cm3/g,
    (2) 1 to 30 parts by weight of a polyethylene which
    (2.1) has a density of 0.940 to 0.968 g/cm3, and
    (2.2) has a melt index (according to DIN 53,735 at 190°C/2.16 kg) of 0.9 to 20 g/10 min.,
    (3) 0.05 to 1 part by weight of a tris-(2,4-dialkylphenyl)-phosphite, the alkyl groups being identical or different and each containing 1 to 9 carbon atoms, and
    (4) optionally, other conventional additives in the conventional amounts,
    for the production of 10 to 500 um thick biaxially oriented film by the blown-bubble extrusion process, the inflation ratio being up to 10:1.
EP78100040A 1977-06-06 1978-06-01 Use of a special polyolefine composition for the production of films by the blow-moulding process Expired EP0000025B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2725676A DE2725676B2 (en) 1977-06-06 1977-06-06 Use of a special polyolefin molding compound for the production of films using the blown film process BASF AG, 6700 Ludwigshafen
DE2725676 1977-06-06

Publications (2)

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EP0000025A1 EP0000025A1 (en) 1978-12-20
EP0000025B1 true EP0000025B1 (en) 1980-06-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP78100040A Expired EP0000025B1 (en) 1977-06-06 1978-06-01 Use of a special polyolefine composition for the production of films by the blow-moulding process

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EP (1) EP0000025B1 (en)
AT (1) AT370123B (en)
DE (2) DE2725676B2 (en)
ES (1) ES470538A1 (en)
IT (1) IT1095282B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2819597A1 (en) * 1978-05-05 1979-11-08 Basf Ag USE OF A SPECIAL POLYOLEFIN MOLDING COMPOSITE FOR THE MANUFACTURING OF FILMS BY THE FILM BLOWED PROCESS
CA1218181A (en) * 1983-04-21 1987-02-17 Asahi Kasei Kogyo Kabushiki Kaisha Polyethylene composition

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3176051A (en) * 1960-08-19 1965-03-30 Grace W R & Co Blended polyethylene composition
US3179720A (en) * 1962-10-22 1965-04-20 Hercules Powder Co Ltd Polyethylene blends
US3988395A (en) * 1970-10-08 1976-10-26 Standard Oil Company (Indiana) Method for blending polyolefin compositions

Also Published As

Publication number Publication date
ATA407678A (en) 1982-07-15
DE2725676B2 (en) 1981-01-15
ES470538A1 (en) 1979-09-01
AT370123B (en) 1983-03-10
IT7824085A0 (en) 1978-05-31
EP0000025A1 (en) 1978-12-20
DE2860026D1 (en) 1980-10-30
IT1095282B (en) 1985-08-10
DE2725676A1 (en) 1978-12-07

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