EP1112322A1 - Melange a base de polyethylene basse densite lineaire, de polyethylene haute densite, et de polyethylene basse densite convenant particulierement aux revetement par extrusion de films - Google Patents

Melange a base de polyethylene basse densite lineaire, de polyethylene haute densite, et de polyethylene basse densite convenant particulierement aux revetement par extrusion de films

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Publication number
EP1112322A1
EP1112322A1 EP99942218A EP99942218A EP1112322A1 EP 1112322 A1 EP1112322 A1 EP 1112322A1 EP 99942218 A EP99942218 A EP 99942218A EP 99942218 A EP99942218 A EP 99942218A EP 1112322 A1 EP1112322 A1 EP 1112322A1
Authority
EP
European Patent Office
Prior art keywords
density polyethylene
low density
ethylene
composition
weight
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP99942218A
Other languages
German (de)
English (en)
Inventor
Ray Edwards
Bruce Alexander Gillespie
Diane Hines Farnham
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eastman Chemical Co
Original Assignee
Eastman Chemical Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Eastman Chemical Co filed Critical Eastman Chemical Co
Publication of EP1112322A1 publication Critical patent/EP1112322A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • 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
    • 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
    • C08L23/08—Copolymers of ethene
    • C08L23/0807—Copolymers of ethene with unsaturated hydrocarbons only containing more than three carbon atoms
    • C08L23/0815—Copolymers of ethene with aliphatic 1-olefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2270/00—Resin or rubber layer containing a blend of at least two different polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/70—Food packaging
    • 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
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/04—Homopolymers or copolymers of ethene
    • C08J2323/08—Copolymers of ethene
    • 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
    • C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2423/04—Homopolymers or copolymers of ethene
    • C08J2423/08—Copolymers of ethene
    • 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

Definitions

  • the present invention relates to a composition comprising a blend of at least three polyethylene components particularly useful for extrusion coating, a process using such blends for extrusion coating, and the composite produced thereby.
  • the invention also relates to films produced from the blends.
  • Prior art polyolefin blends containing linear low density polyethylene as a component, are useful in certain extrusion coating applications.
  • One such prior art blend is Dow Chemical's Dowlex 3010 linear low density polyethylene, which contains at least 80 weight percent linear low density polyethylene.
  • Examples of extrusion coating applications are structures such as flexible polymeric film/paper packages for foods, and metallized polymeric film balloons.
  • the linear low density polyethylene component in the prior art blends provides strong heat seals (coating- to-coating); strong tensile properties of coatings; strong resistance of coatings to tear; high resistance of coatings to missile, or dart, impact; resistance of coatings to puncture; and coating stress crack resistance. These properties are generally not attainable with polyolefin blends which contain no linear low density polyethylene. However, these prior art blends containing linear low density polyethylene exhibit certain undesirable processing problems.
  • the prior art blends that contain high levels, i.e., 80 weight percent and greater, of linear low density polyethylene, generally exhibit excessive extrudate edge bead, manifested by excessive neck-in of the molten extrudate. This is a problem readily known to those skilled in the art of extrusion coating. Excessive edge bead must be trimmed away and disposed of as scrap. Otherwise, a final coated structure will not exhibit a uniform thickness.
  • the present inventors have unexpectedly discovered an improved extrusion coating polyolefin composition comprising a blend of a linear low density polyethylene, a high density polyethylene, and a low density polyethylene.
  • the composition of the present invention desirably extrudes with lower power requirements (extruder drive motor watts) than the prior art two component blends containing linear low density polyethylene. This occurs even though the compositions of the present invention require significantly more thermal energy per unit of mass to melt than is required by the prior art blends.
  • the compositions of the present invention exhibit significantly less neck-in (less edge bead) than that exhibited by the prior art compositions.
  • the composition according to the present invention is a polyolefin blend comprising at least the following three components.
  • the first component is a linear low density polyethylene which generally provides coating-to-coating heat seal strength, toughness, tear resistance, and puncture resistance. In general, the properties are essentially equal to those exhibited by the prior art compositions.
  • the second component is a high density polyethylene copolymer which generally provides tensile strength and stress crack resistance properties. The properties are generally substantially equal to the prior art compositions.
  • the third component is a low density polyethylene homopolymer which generally contributes to a reduced edge bead by providing a lower neck-in of the molten extrudate. Generally, this property of neck-in is superior to the prior art compositions.
  • the third component also generally provides good wetting of the substrate surface to which the blend is coated, for good coating-to-substrate bonding. Accordingly, the present invention that contains a lower amount of linear low density polyethylene than prior art compositions is utilized without a loss in coating properties that would be normally expected with a reduction in linear low density polyethylene content.
  • the present invention is also directed to an improved extrusion coating process comprising the use of the above-mentioned composition of at least a linear low density polyethylene, a high density polyethylene, and a low density polyethylene. Further, the present invention is also directed to a coated article or composite comprising a substrate, either primed or unprimed, having the aforementioned composition coated thereon, preferably by means of an extrusion coating process.
  • the primer used to provide bonding to a substrate is preferably a water-soluble primer, more preferably a polyethyleneimine primer.
  • the present invention includes laminates wherein a layer of the aforementioned three component composition is utilized between two similar or dissimilar substrates, optionally including a primer layer between the polyethylene blend and each substrate.
  • the resultant composite or laminate may be formed into an article, such as a package for food, having good barrier properties, that is, the package is generally impermeable to liquids and gases.
  • the present invention is also directed to films prepared from the novel compositions, particularly by means of cast or blown film techniques.
  • compositions comprising a blend of at least a linear low density polyethylene, a high density polyethylene, and a low density polyethylene.
  • Another object of the invention is to provide an improved extrusion coating process wherein there is utilized as the extrusion coating, the novel compositions comprising the blends of the present invention as defined herein.
  • a still further object of this invention is to provide a coated substrate or a composite wherein the coating composition comprising the novel blends of the present invention is applied onto the substrate by an extrusion coating process.
  • Figures 1 and 2 are obtained using differential scanning calorimetry (DSC) to determine melting point profiles, in particular, the maximum melting point and the thermal energy per unit mass required to melt the mass.
  • DSC differential scanning calorimetry
  • the melting point profile and pertinent calorimetry data of the prior art two component blend is shown in Figure 1.
  • the melting point profile and pertinent calorimetry data of a three component blend of the present invention is shown in Figure 2.
  • compositions of the present invention comprise blends of a linear low density polyethylene, a high density polyethylene, and a low density polyethylene.
  • the linear low density polyethylene component of the blend is known to generally provide heat seal strength, toughness, tear resistance and puncture resistance properties to an extruded coating.
  • the linear low density polyethylene component of the composition is a low density polyethylene copolymer comprising ethylene and a C3-C10 alpha-olefin comonomer.
  • the alpha-olefin comonomer is preferably a C ⁇ -Cs alpha-olefin, and more preferably an ethylene-hexene or ethylene-octene copolymer.
  • the alpha-olefin comonomer is present in an amount of about 5 to about 12 percent by weight of the ethylene-alpha olefin copolymer, more preferably an amount of from about 7 to about 10 percent by weight.
  • the ethylene-alpha olefin copolymer component is further characterized by having a melt index value measured at 190°C, of about 0.5 dg/min. to about 10 dg/min., more preferably from about 1 dg/min.
  • the ethylene-alpha olefin linear low density copolymers may be produced by any method known in the art such as, for example, described in U.S. Patent No. 4,339,507.
  • the linear low density ethylene copolymer component of the blend of the present invention is present in an amount of about 25 to about 40 weight percent, based on the weight of the blend, more preferably in an amount of from about 30 to about 35 weight percent, and most preferably, in an amount of about 33 weight percent, based on the weight of the blend.
  • the high density polyethylene component of the blend is known to generally provide tensile strength and stress crack resistance to the blend of the present invention.
  • the high density polyethylene component of the novel composition is a homopolymer of ethylene or a copolymer of ethylene and an alpha olefin comonomer.
  • the alpha olefin comonomer preferably has about 3 to about 10 carbon atoms.
  • the alpha olefin comonomer is present in an amount of about 0.2 to about 1 percent by weight of the copolymer, more preferably about 0.4 to about 0.7 percent by weight, and still more preferably in an amount of about 0.5 percent by weight, based on the weight of the copolymer.
  • the preferred comonomer is hexene.
  • the high density polyethylene component is further characterized as having an annealed density of at least 0.940 g/cc to about 0.97 g/cc, more preferably from about 0.95 g/cc to about 0.97 g/cc; a melt index of about 6 dg/min. to about 20 dg/min., more preferably about 14 dg/min. to about 18 dg/min., and most preferred about 16 dg/min., measured at 190°C.
  • the high density polyethylene component may be produced by any method known in the art, such as, for example, that described in U.S. Patent No. 4,339,507.
  • the high density polyethylene component of the blend of the present invention is present in an amount of from about 25 to about 40 weight percent, based on the weight of the blend, more preferably, in an amount of from about 30 to about 35 weight percent, and most preferably in an amount of about 33 weight percent, based on the weight of the blend.
  • the low density polyethylene component of the blend of the present invention generally provides good wetting of a substrate to allow a good bonding to the substrate.
  • the low density polyethylene component of the novel composition is a polyethylene of broad molecular weight distribution, as indicated by having a polydispersity index above 9 to about 12.
  • the low density polyethylene is further characterized by having a melt index value of about 3 dg/min.
  • the low density polyethylene is further characterized by having an annealed density of from about 0.90 g/cc to about 0.93 g/cc.
  • the low density polyethylene component of the blend of the present invention is present in an amount of from about 25 to about 40 weight percent, based on the weight of the blend, more preferably in an amount of from about 30 to about 35 weight percent, and most preferably, in an amount of about 33 weight percent, based on the weight of the blend.
  • compositions of the present invention may be prepared using any method known in the art.
  • the compositions may be prepared by dry blending or tumbling in any conventional equipment or by mixing in any conventional mixing equipment such as single and twin screw extruders, Werner Pfleiderer mixers, Banbury mixers or the like.
  • the substrate to which the blend of the present invention is applied is preferably a primed substrate.
  • the primer is preferably a water-soluble primer. More preferably, the substrate is primed with polyethyleneimine. After priming, the primed surface is then extrusion coated with the blend.
  • the polyethyleneimine used to prime the various substrates to be extrusion coated with the blends of the present invention is most preferably MICA Corporation's A-131-X polyethyleneimine primer. Extrusion coating methods are well known in the art. One skilled in the art can readily extrusion coat or extrusion laminate a composition of the present invention onto primed or unprimed surfaces to prepare a composite or laminate.
  • the composition of the present invention may be extrusion coated to a substrate or extrusion laminated between two substrates.
  • Extrusion coating and laminating means and methods are well known in the art, and it is expected that any of such methods may be utilized in the present invention. It is also possible to coextrusion coat the novel compositions to a structure of at least one or more substrates.
  • the laminating process may further include the step of preparing a film from the composition of the present invention.
  • the film may be, for instance, a cast or blown film. The skilled artisan would be well aware of the methods available in the art to prepare a film from the blends of the present invention.
  • the substrate to which the blends of the present invention may be coated or laminated may be any substrate to which polyolefins are normally coated.
  • suitable substrates include, but are not limited to, paper or paperboard (printed or imprinted), coated, e.g. clay-coated or uncoated, metal foils, plastic films and the like. These surfaces may be primed or unprimed, with a preference for primed surfaces.
  • a laminate according to the present invention comprises two substrates, each of which may be independently primed or unprimed on the surface facing the other substrate, with the composition of the present invention between the substrates.
  • the substrates may be similar or dissimilar.
  • the substrates may both be paper or one substrate may be paper and the other substrate may be a polymeric film.
  • Films may be produced from the novel compositions of the present invention by any known technique. Preferred herein are the cast and blown film techniques, both of which are well known in the art.
  • composition of the present invention can contain other ingredients, such as additional polyethylene components, fillers, slip agents, tackifiers, pigments, and the like, as known in the art, provided the compositions are not adversely affected.
  • Swell Ratio is defined as the ratio of the extrudate over that of the orifice diameter of the extrusion plastometer in ASTM D1238-62T.
  • the diameter of the specimen is measured in the area between 0.159-cm and 0.952-cm of the initial portion of the specimen as it emerges from the extrusion plastometer. Measurements were made by standard methods according to ASTM D374.
  • Annealed Density was determined in accordance with ASTM D1505.
  • Polydispersity Index is the ratio of the weight-average molecular weight, Mw, to number-average molecular weight, Mn.
  • Mw and Mn were obtained by size-exclusion chromatography on a Waters 150C gel permeation chromatograph equipped with the standard refractometer detector and a Viscotek 15 OR differential viscometer system.
  • the 3 -column set consisted of Waters' 10 3 , 10 4 , and linear- mixed bed (10 3 , 10 4 , and 10 5 ) Micro-Styragel HT columns. The samples were run as 0.125% weight-to-volume solutions in ortho-dichlorobenzene at 140°C.
  • the data were interpreted using Viscotek Unical software (V4.02), by universal calibration using NBS 1475 (linear polyethylene) and NBS 1476 (branched polyethylene) for any polyethylene sample.
  • Neck-In, inches/edge or cm edge was determined by first measuring the width of an extrusion coating, W, on a substrate, and then subtracting that measurement from the width of the extrusion coating die, D. The difference, (D- W) is then divided by 2, i.e. (D-WV2, resulting in the amount of extrudate neck-in per edge.
  • Puncture Resistance was determined in accordance with ASTM D4649.
  • the composition utilized was Dow Chemical Company's Dowlex 3010 polyethylene, which is believed to be a blend of about 80 weight percent ethylene-octene copolymer, containing about 7 to about 10 weight percent octene, and about 20 weight percent low density polyethylene. Further, the blend has a melt index of 5.8 dg/min. at 190°C and an annealed density of 0.922 g/cc. Pellets of the Dowlex 3010 blend were tested using differential scanning calorimetry to determine the melting point profile, particularly the maximum melting point and the thermal energy per unit mass required to melt the mass. The melting point profile and calorimetry data obtained for the Dowlex 3010 blend are shown in Figure 1.
  • the Dowlex 3010 blend was extrusion coated, a process well known in the art, to a 40 pound natural Kraft paper.
  • the Dowlex 3010 blend was applied to the Kraft paper at a melt temperature of 601°F (317°C), from a 3.5 inch diameter extruder with its barrel heaters set at 397°F (203°C), 500°F (260°C), 600°F
  • Extruder power measured in percent motor load, and kilowatts required to extrude the Dowlex 3010 blend, at the constant extruder throughput rate, are shown in Table I. Also shown in Table I is the energy required to melt a given mass of the Dowlex 3010 blend, as well as the maximum melting point of the Dowlex 3010 blend.
  • composition of the present invention was prepared by dry blending the following components:
  • linear low density polyethylene is an ethylene- hexene copolymer containing about 8% by weight of hexene having a melt index of about 2.0 dg/min. at 190°C, an annealed density of about 0.910 g/cc, a swell ratio of about 1.2, and a polydispersity index of about 3.
  • the high density polyethylene is an ethylene-hexene copolymer containing about 0.7 weight % hexene, having a melt index of 16 dg/min. at 190°C and an annealed density of 0.96 g/cc; and (c) 33 weight percent of Eastman Chemical Company ' s 811 A low density polyethylene, based on the weight of the composition.
  • the low density polyethylene is a polyethylene homopolymer having a melt index of about 20 dg/min. at 190°C and an annealed density of about 0.92 g/cc.
  • the low density polyethylene is further characterized as having a broad molecular weight distribution as reflected in a polydispersity index of about 10.
  • the resultant blend of the three components which is an exemplary composition of the present invention, is characterized by having a melt index of about 5.5 dg/min. at 190°C and an annealed density of about 0.922 g/cc.
  • Pellets of the composition of this example were tested using differential scanning calorimetry to determine its melting point profile, particularly the maximum melting point of the blend and the thermal energy per unit mass of the composition required to melt the mass.
  • the melting point profile and calorimetry data of the blend of this example is shown in Figure 2.
  • the resultant blend of this example was extrusion coated to natural 40 lb. Kraft paper.
  • the blend was applied at a melt temperature of 596°F (313°C) to the Kraft paper from a 3.5 inch diameter extruder with its barrel heaters set at 398°F (203°C), 499°F (259°C), 600°F (315°C) and 639°F (338°C).
  • the extrusion screw was single-flighted with a compression ratio of 3.5:1, providing a uniform output through the die.
  • the extrusion die throughput rate was held constant at 10 lb/inch/hr (1.8 kg/cm/hr) of die width.
  • Extruder power measured in percent motor load and kilowatts required to extrude the blend of this Example 2, noted at the constant extruder throughput rate, are reported in Table I. Also reported in Table I is the energy required to melt a given mass of the blend of this Example 2, as well as the maximum melting point of the blend.
  • Example 2 The novel composition of Example 2, typical of the present invention, can be extruded using a lower extruder drive motor load than is required for the prior art blend of Example 1. In this instance, the reduction in extruder drive motor load is 12 percent.
  • Example 2 can be extruded using less extruder drive motor power than is required for the prior art blend of Example 1.
  • the reduction herein was 12 percent in extruder drive motor power.
  • the lowering of extruder drive motor power permits an extrusion coating operation to produce product with greater latitude in power requirements before maximum drive motor load is exceeded.
  • Example 2 is 15 percent greater than is required to melt a mass of the blend of Example 1 (the prior art blend). Based on the difference in thermal energies required to melt the blends of Examples 1 and 2, one would have predicted the opposite result, namely, a higher power requirement accompanying a composition of the present invention, as typified by the blend of Example 2, when compared with the prior art blend of Example 1.
  • Example 3 (COMPARATIVE) In this example was used the same composition as in Example 1, namely
  • the Dow Chemical Company's Dowlex 3010 blend was extrusion coated to natural 40 lb. Kraft paper.
  • the Dowlex 3010 blend was applied to the Kraft paper at a melt temperature of 601°F (317°C) from a 3.5 inch diameter extruder with its barrel heaters set at 397°F (203°C), 500°F (260°C), 600°F (315°C) and 645°F (340°C).
  • the extrusion die throughput rate was held constant at
  • Example 2 The same composition as described in Example 2 herein was extrusion coated to natural 40 lb. Kraft paper.
  • the composition was applied to the natural Kraft paper at a melt temperature of 596°F (313°C), from a 3.5 inch diameter extruder with its barrel heaters set at 398°F (203°C), 499°F (259°C), 600°F (315°C), and 639°F (338°C).
  • the extrusion die throughput rate was held constant at 10 lb/inch/hr (1.8 kg/cm/hr) of die width..
  • the die to nip air gap was 5.25 inches (6.4 cm).
  • Samples of the coated Kraft paper were obtained at 600 fpm (185 m/min. ) and at 1000 fpm (305 m/min.), and neck-in measurements of the coating of the blend of Example 2 (typical of the present invention) were taken at each speed. The results are reported in Table II. Table II
  • compositions of the present invention offer lower, and therefore superior, neck-in values when compared to the prior art blend of Example 3.
  • Lower neck-in values result in a wider extrusion coating and a reduced edge bead of the molten extrudate. Edge beads are normally slit and discarded as scrap, resulting in an economic loss. Accordingly since the compositions of the present invention are characterized by lower neck-in, and reduced edge bead, the economic loss is decreased since less is discarded as edge bead scrap when compared with use of the prior art blend of Example 3.
  • Example 5 The same composition of Example 1 herein, namely Dow Chemical
  • Company's Dowlex 3010 blend was cast into film by known techniques at a melt temperature of 603 °F (318°C) and at a sufficient haul-off speed to obtain a film thickness of 0.001 inch (0.0254 mm).
  • the resultant cast film was tested for heat seal strength (film to film); tensile properties; resistance to tear; resistance to missile, or dart, impact; and puncture resistance.
  • pellets of the Dowlex 3010 blend were pressed into sheets and tested for stress crack resistance. The results are reported in Table III.
  • Example 2 Following the aforementioned procedure, the composition of Example 2 was formed into cast film at a melt temperature of 603 °F (318°C) at a sufficient haul-off speed to obtain a film thickness of 0.001 inch (0.0254 mm). The resultant cast film was tested for heat seal strength (film to film); tensile properties; resistance to tear; resistance to missile, or dart, impact; and puncture resistance. Pellets of the composition of Example 2 were pressed into sheets and tested for stress crack resistance. The properties are reported in Table III.
  • Example 2 was used herein to produce blown film. Processes for producing blown film are well known in the art.
  • the composition of Example 2 was extruded from a 2.5 inch (6.4 cm) diameter extruder having a length to diameter ratio of 24:1, and equipped with 5 zones of heating.
  • the annular extrusion die had a diameter of 6 inches (15.3 cm), and the die's land to land separation was uniformly set to 0.088 inch (0.224 mm).
  • the extrudate temperature was 385°F (196°C).
  • the extrudate output rate was 89 lb/hr (41 kg/hr), and the blown film's haul-off speed was 78 fpm (24 m/min.)
  • the film blow up ratio was 2.5, resulting in a tubular lay flat width of 22.5 inch (57 cm), and a uniform film thickness of 0.001 inch (0.0254 mm).
  • the resultant film blown from the composition of Example 2 was uniform in thickness and of overall excellent quality.
  • novel compositions of the present invention have many applications.
  • the novel compositions may be formed into cast and blown films, using any of the well known techniques for forming cast or blown film.
  • the novel compositions of the present invention may be used in preparing extrusion coatings having substantially equivalent film/coating properties compared to prior art compositions, but with improved processing properties, namely, a lower extruder motor drive power requirement and a lower neck-in, that is, less edge bead.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Laminated Bodies (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)

Abstract

La présente invention concerne une nouvelle composition renfermant trois composants à base de polyéthylènes différents. En outre, ce mélange comprend un polyéthylène basse densité linéaire, un polyéthylène haute densité, et un polyéthylène basse densité. On peut utiliser cette composition dans les revêtements par extrusion, dans la préparation de films, coulage et soufflage compris, et dans d'autres applications, notamment relatives aux stratifiés.
EP99942218A 1998-08-18 1999-08-16 Melange a base de polyethylene basse densite lineaire, de polyethylene haute densite, et de polyethylene basse densite convenant particulierement aux revetement par extrusion de films Withdrawn EP1112322A1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US9699598P 1998-08-18 1998-08-18
US96995P 1998-08-18
US29179399A 1999-04-14 1999-04-14
US291793 1999-04-14
PCT/US1999/018605 WO2000011075A1 (fr) 1998-08-18 1999-08-16 Melange a base de polyethylene basse densite lineaire, de polyethylene haute densite, et de polyethylene basse densite convenant particulierement aux revetement par extrusion de films

Publications (1)

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EP1112322A1 true EP1112322A1 (fr) 2001-07-04

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EP99942218A Withdrawn EP1112322A1 (fr) 1998-08-18 1999-08-16 Melange a base de polyethylene basse densite lineaire, de polyethylene haute densite, et de polyethylene basse densite convenant particulierement aux revetement par extrusion de films

Country Status (6)

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EP (1) EP1112322A1 (fr)
JP (1) JP2002523542A (fr)
KR (1) KR20010072727A (fr)
CA (1) CA2340662A1 (fr)
MX (1) MXPA01001472A (fr)
WO (1) WO2000011075A1 (fr)

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Publication number Priority date Publication date Assignee Title
US6509106B1 (en) * 1998-08-18 2003-01-21 Eastman Chemical Company Blends containing linear low density polyethylene, high density polyethylene, and low density polyethylene particularly suitable for extrusion coating and films
BRPI0413766B1 (pt) * 2003-09-05 2014-01-28 Composição para extrusão de polietileno,uso de uma composição, processo para extrudar um material polimérico sobre um substrato e camada de película polimérica
DE602005001055T2 (de) 2005-10-18 2007-12-27 Borealis Technology Oy Polyethylenmischungskomponente und diese enthaltende Mischungen
SE538048C2 (sv) 2012-11-30 2016-02-23 Stora Enso Oyj Förfarande för framställning av ett förpackningsmaterial
SE538498C2 (sv) 2014-02-19 2016-08-09 Stora Enso Oyj Förfarande för framställning av ett förpackningsmaterial
JP7110100B2 (ja) * 2015-12-28 2022-08-01 エスアイジー テクノロジー アーゲー 示差走査熱量測定法によって特徴付けられた重合体内層を有するシート状複合材、特に、寸法安定性のある食品用容器のための包装用積層体
JP6827892B2 (ja) * 2017-07-24 2021-02-10 大日本印刷株式会社 ポリオレフィン樹脂フィルム
JP6738568B2 (ja) * 2019-06-21 2020-08-12 大日本印刷株式会社 ポリエチレン樹脂フィルム
CN112442223B (zh) * 2019-09-04 2023-02-28 中国石油化工股份有限公司 一种聚乙烯组合物及聚乙烯薄膜

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US4728325A (en) * 1986-04-03 1988-03-01 Exxon Chemical Patents Inc. Diaper backsheet
JP2643348B2 (ja) * 1988-09-01 1997-08-20 三井石油化学工業株式会社 ポリエチレン樹脂組成物およびフィルム
JP3375780B2 (ja) * 1995-03-29 2003-02-10 三井化学株式会社 重包装袋用ポリエチレン樹脂組成物およびその組成物からなる重包装袋用ポリエチレン樹脂フィルム

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See references of WO0011075A1 *

Also Published As

Publication number Publication date
MXPA01001472A (es) 2002-05-08
CA2340662A1 (fr) 2000-03-02
KR20010072727A (ko) 2001-07-31
JP2002523542A (ja) 2002-07-30
WO2000011075A1 (fr) 2000-03-02

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