WO2015061440A1 - Composition de polyéthylène et de polypropylène convenant à une utilisation en tant qu'opercules souples à ouverture facile - Google Patents

Composition de polyéthylène et de polypropylène convenant à une utilisation en tant qu'opercules souples à ouverture facile Download PDF

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WO2015061440A1
WO2015061440A1 PCT/US2014/061755 US2014061755W WO2015061440A1 WO 2015061440 A1 WO2015061440 A1 WO 2015061440A1 US 2014061755 W US2014061755 W US 2014061755W WO 2015061440 A1 WO2015061440 A1 WO 2015061440A1
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polymer
composition
seal
film
percent
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PCT/US2014/061755
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English (en)
Inventor
Xiaosong Wu
Kim L. Walton
Lamy J. Chopin Iii
Morgan M. Hughes
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Dow Global Technologies Llc
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Publication of WO2015061440A1 publication Critical patent/WO2015061440A1/fr

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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
    • 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
    • C08L23/14—Copolymers of propene
    • C08L23/142—Copolymers of propene at least partially crystalline copolymers of propene with other olefins
    • 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
    • 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
    • C08L2203/162—Applications used for films sealable films

Definitions

  • the invention relates to a polyolefin-based heat sealable, retortable easy opening seal.
  • the invention also relates to methods of making and using the heat sealable, retortable easy opening seal.
  • Heat sealable and easy-opening films are employed on a large scale for temporarily closing containers that include, for example, food products. During use, a consumer tears away the peelable film. To gain consumer acceptance, a number of characteristics associated with a heat sealable and peelable film are desired.
  • Heat sealable films must be capable of being sealed upon the application of heat.
  • the backing or web layer of the film comes into direct contact with a heated surface such as a sealing jaw. Heat is thus transferred through the backing layer of the film to melt and fuse the inner sealant layer to form a seal.
  • the backing layer generally has a higher melting temperature than the inner sealant layer so that the backing layer of the film does not substantially melt and therefore does not stick to the heated surface.
  • the seal should be capable of surviving a retort operation.
  • a typical retort process subjects the sealed package to a temperature of 212°F. to 275° F. for 20 to 60 minutes or even up to 100 minutes, depending on the size of the container.
  • gases are generated within the package and pressure increases greatly.
  • the retort system may include an over pressure to help balance the package internal pressures, the net result will still be a pressurized package during retorting.
  • the films used to seal the container must be sufficiently strong to withstand the increased internal pressure and the elevated temperatures.
  • seals used in retort applications are typically difficult to open at room temperature using average manual force. It would be desirable to have a heat sealable film which could withstand the conditions of retort applications yet still be easily opened manually by a consumer.
  • the force required to pull a seal apart is called “seal strength” or “heat seal strength” which can be measured in accordance with ASTM F88-94.
  • the desired seal strength varies according to specific end user applications. For flexible packaging applications, such as cereal liners, snack food packages, cracker tubes and cake mix liners, the seal strength desired is generally in the range of about 1-9 pounds per inch.
  • seal strength in the range of about 2-3 pounds per inch is commonly specified, although specific targets vary according to individual manufactures requirements.
  • a sealable and peelable film can also be used in rigid package applications, such as lids for convenience items (e.g., snack food such as puddings) and medical devices.
  • Typical rigid packages have a seal strength of about 1-5 pounds per inch.
  • the seal layer can be on the lid or on the container or both.
  • hot tack Another desired property for the heat-sealable films is adequate hot tack.
  • the film is removed from contact with the heated surface and/or the retort process, the film is cooled to room temperature. Before the inner sealant layer is cooled to room temperature, it should be able to maintain its seal integrity.
  • the ability of an adhesive or sealant layer to resist creep of the seal while it is still in a warm or molten state is generally referred to as "hot tack.” To form a good seal, the hot tack of the sealable and peelable film should be adequate.
  • a broad sealing window also enables high speed packaging of heat sensitive products, as well as, provides a degree of forgiveness for changes in packaging or filling speeds.
  • Additional desired characteristics for heat sealable films include a low coefficient of friction and good abuse resistance.
  • a low coefficient of friction ensures that the sealant layer can be processed smoothly and efficiently on fabrication and packaging equipment and is particularly important for vertical form-fill-and-seal packaging.
  • Good abuse resistance and toughness is desired, for example, in cereal box liners to withstand tears and punctures from irregularly-shaped, rigid cereals.
  • Additional characteristics include taste and odor performance and barrier or transmission properties.
  • Such films allow one or more of the desired goals to be met.
  • Such films are characterized by having a peelable seal layer comprising from about 50 to about 85 percent by weight of a first polymer and from 15 to 50 percent of a second polymer.
  • the first polymer is a propylene based polymer characterized by having a melting point of at least 125° C together with a Comonomer Composition Distribution Breadth ("CCDB") less than 2.
  • the second polymer is characterized by having an interfacial adhesion with the first polymer of less than 1 lb/inch.
  • polymer refers to a polymeric compound prepared by polymerizing monomers, whether of the same or a different type.
  • the generic term polymer thus embraces the term “homopolymer”, usually employed to refer to polymers prepared from only one type of monomer as well as “copolymer” which refers to polymers prepared from two or more different monomers.
  • Melt strength which is also referred to in the relevant art as “melt tension” is defined and quantified herein to mean the stress or force (as applied by a wind-up drum equipped with a strain cell) required to draw a molten extrudate at a haul-off velocity at which the melt strength plateaus prior to breakage rate above its melting point as it passes through the die of a standard plastometer such as the one described in ASTM D1238-E. Melt strength values, which are reported herein in centi-Newtons (cN), are determined using a Gottfert Rheotens at 190°C.
  • CCDB Comonomer Composition Distribution Breadth
  • HTLC High Temperature Liquid Chromatography
  • a Waters GPCV2000 high temperature SEC chromatograph is reconfigured to build the HT-2DLC instrumentation.
  • Two Shimadzu LC-20AD pumps are connected to the injector valve in GPCV2000 through a binary mixer.
  • the first dimension (Dl) HPLC column is connected between the injector and a 10-port switch valve (Valco Inc).
  • the second dimension (D2) SEC column is connected between the 10-port valve and, an infrared absorbance detector (IR5).
  • IR5 detector is used for both concentration and composition
  • the IR5 detector is provided by PolymerChar, Valencia, Spain.
  • the Dl column is a high temperature Hypercarb graphite column (2.1 x 100 mm) purchased from Thermo Scientific.
  • the D2 column is a PLRapid-M column purchased from Varian (10 x 100 mm).
  • Reagents HPLC grade trichlorobenzene (TCB) can be obtained from Fisher
  • Sample Preparation 0.2 g of polyolefin sample is placed in a 10-mL Waters autosampler vial. 8-mL of decane with 200 ppm Ionol is added to the vial afterwards. After sparging nitrogen to the sample vial for about 1 min, the sample vial is put on a heated shaker with temperature set at 160 °C. The dissolution is done by shaking the vial at the temperature for 2 hr. The vial is then transferred to the autosampler for injection. Please note that the actual volume of the solution may be more than 8 mL due to the thermal expansion of the solvent.
  • HT-2DLC The Dl flow rate is set at 0.01 mL/min.
  • the composition of the mobile phase is 100% decane for the first 10 min of the run.
  • the composition is then increased to 60% of TCB in 489 min.
  • the data are collected for 489 min as the duration of the raw chromatogram.
  • a post-run gradient is used after the 489 min data acquisition time to clean and equilibrate the column for the next run:
  • step 8 the flow rate and mobile phase composition are the same as the initial conditions of the run gradient.
  • the D2 flow rate is at 2.51 mL/min.
  • Two 60 ⁇ L ⁇ loops are installed on the 10-port switch valve. 30- ⁇ L ⁇ of the eluent from Dl column is loaded onto the SEC column with every switch of the valve.
  • Signals from IR5 detector may be collected by EZChrom (Agilent) through a SS420X analogue-to-digital conversion box and the chromatograms can be exported in ASCII format and imported into a home-written MATLAB software for data reduction.
  • One signal referred as 'measure' by the manufacturer, is used to determine concentrations of the eluted polymers.
  • the other signal referred as 'methyl' by the manufacturer, is used to measure concentrations of methyl groups of the eluted polymers.
  • the ratio of methyl to measure (methyl/measure) is used to determine the compositions of the eluted polymers after calibration.
  • Eight polymers with different propylene contents are used in calibration. The polymers are made by metallocene catalyst giving rise to narrow comonomer composition distribution breadth or CCDB.
  • the compositions of the eight polymer standards are determined by NMR as 0, 20.0, 28.0, 50.0, 86.6, 92.0, 95.8, and 100 weight percent of propylene in polymer (wt% P).
  • the calibration curve is constructed by linear fitting of the methyl/measure versus wt% P of these standards. .
  • the first dimension HPLC chromatogram is reconstructed by plotting the IR signal of every cut (from total IR SEC chromatogram of the cut) as a function of the elution volume.
  • the IR vs. Dl elution volume is normalized by total IR signal to obtain weight fraction vs. Dl elution volume plot.
  • the IR methyl/measure ratio is obtained from the reconstructed IR measure and IR methyl chromatograms. The ratio is converted to composition using the calibration curve of PP wt.% (by NMR) vs. methyl/measure obtained from second dimension SEC experiments..
  • the CCD breadth of a polymer sample is calculated according to the following equations:
  • the CCDB of a polymer sample is:
  • the unit of CCDB is Wt% P.
  • the interfacial adhesion strength between polymers is determined according to the following method:
  • the face-to-face bonded plaques used for T-peel adhesion force test are prepared by laminate, i.e. melt bonding two compression molded plaques of adherent pairs.
  • the compression molded plaque for melt bonding is 1-mm thick from which peel specimen will be die cut extracted.
  • the sample preparation is detailed as follows:
  • 1st step compression mold individual plaque at 190°C under 25000 psi pressure, for
  • 2nd step stack a pair, re-mold at 190°C under 200psi contact pressure for 10 minutes.
  • 3rd step The bonded plaques were conditioned in ASTM environment for 48 hours prior to peel test. The bonded plaque was cut into 25mm by 250mm strips, with about 75 mm long legs by a NAEF punch press.
  • the adhesion strength was measured according to ASTM D3330/D3330M type A test for adhesives. This is a 180 0 peel strength measurement on a partially pre-peeled film with a constant stretching rate of 254mm/min. At least five sample strips were examined and the peel strength was evaluated by taking the average. All the measurements were conducted in a temperature controlled room at 23°C.
  • the strip was gripped and peeled by an INSTRON Model 1122, made by INSTRU-MET Corporation.
  • the INSTRON was operated with pneumatic grips, separating the two specimen legs at 180°, leaving the bonded area at 90° with each leg, starting from an initial distance between the two grips of about 10 mm, and using a constant separation speed of 254 mm/min. Complete stress-strain curve were recorded for 5 independent specimens per pair, and were subsequently used to quantify the average adhesion strength.
  • the peelable seal layers of the present invention comprise at least a first polymer and a second polymer.
  • the first polymer of the present invention comprises from 50 to 90 percent by weight of the seal layer.
  • the first polymer comprises at least 55 percent, more preferably at least 60 percent or even 70 percent of the seal layer, and less than 85 percent, optionally less than 80 percent or even 75 percent by weight of the seal layer.
  • the second polymer comprises from 10 to 50 percent by weight of the seal layer.
  • the second polymer comprises at least 15, optionally at least 20 percent of the seal layer, and no more than 45 percent, more preferably no more than 40 percent of the seal layer. It should be understood that the first polymer do not necessarily have to equal 100% of the seal layer, or even 100% of the resin used in the seal layer.
  • the first polymer is a propylene based polymer characterized by having a melting point of at least 125° C, preferably at least 130° C, more preferably at least 135° C.
  • the melting point of the first polymer is less than 150° C , preferably less than 145° C.
  • the first polymer is further characterized by having a Comonomer Composition Distribution Breadth (or "CCDB")_ less than 2, preferably less than 1.5, more preferably less than 1, as determined according to the HTLC test method described above.
  • propylene based means that at least 50% of the monomer units from which the polymer is derived are propylene. It is generally preferred that the first polymer be derived from at least 90% propylene units, more preferably at least 95% propylene units, and most preferably at least 98% propylene units. If one or more comonomer(s) is (are) present, it may be ethylene or any alpha olefin having from 4-12 carbon atoms, but ethylene is preferred
  • the propylene based first polymer of the present invention have a melt flow rate (ASTM D-1238, 2.16 kg, 230 ° C) in the range of 0.5 to 30 g/ 10 min more preferably 2 to 25 g/10 min, and most preferably from 5 to 20 g/10 min.
  • the first polymer will have a density (as determined according to ASTM D-792) of 0.890 to 0.902 g/cm 3 , more preferably 0.896 to 0.902 g/cm3 .
  • the first polymer for use in the present invention will preferably have a unimodal molecular weight distribution (M w /M n ), and the molecular weight distribution is preferably less than four more preferably less than three.
  • the first polymers of the present invention are conveniently made using advanced catalyst technology.
  • Suitable catalysts and catalyst precursors for use in the present invention include metal complexes such as disclosed in WO2005/090426, in particular, those disclosed starting on page 20, line 30 through page 53, line 20, which is herein incorporated by reference.
  • Suitable catalysts are also disclosed in US 2006/0199930; US 2007/0167578; US 2008/0311812; US 7,355,089 B2; or WO 2009/012215, which are herein incorporated by reference with respect to catalysts.
  • Particularly preferred catalysts are those of the following formula:
  • R20 is an aromatic or inertly substituted aromatic group containing from 5 to 20 atoms not counting hydrogen, or a polyvalent derivative thereof;
  • T3 is a hydrocarbylene or silane group having from 1 to 20 atoms not counting hydrogen, or an inertly substituted derivative thereof;
  • M3 is a Group 4 metal, preferably zirconium or hafnium;
  • G is an anionic, neutral or dianionic ligand group; preferably a halide, hydrocarbyl or dihydrocarbylamide group having up to 20 atoms not counting hydrogen;
  • g is a number from 1 to 5 indicating the number of such G groups.
  • T3 is a divalent bridging group of from 2 to 20 atoms not counting hydrogen, preferably a substituted or unsubstituted, C3-6 alkylene group;
  • Ar2 independently each occurrence is an arylene or an alkyl- or aryl-substituted arylene group of from 6 to 20 atoms not counting hydrogen;
  • M3 is a Group 4 metal, preferably hafnium or zirconium;
  • G independently each occurrence is an anionic, neutral or dianionic ligand group; g is a number from 1 to 5 indicating the number of such X groups; and
  • Preferred examples of metal complexes of foregoing formula include the following compounds :
  • M3 is Hf or Zr
  • Ar4 is C6-20 aryl or inertly substituted derivatives thereof, especially 3,5- di(isopropyl)phenyl, 3,5-di(isobutyl)phenyl, dibenzo-lH-pyrrole-l-yl, or anthracen-5-yl, and
  • T4 independently each occurrence comprises a C3-6 alkylene group, a C3-6 cycloalkylene group, or an inertly substituted derivative thereof;
  • R21 independently each occurrence is hydrogen, halo, hydrocarbyl
  • trihydrocarbylsilyl or trihydrocarbylsilylhydrocarbyl of up to 50 atoms not counting hydrogen
  • G independently each occurrence is halo or a hydrocarbyl or trihydrocarbylsilyl group of up to 20 atoms not counting hydrogen, or 2 G groups together are a divalent derivative of the foregoing hydrocarbyl or trihydrocarbylsilyl groups.
  • Ar4 is 3,5-di(isopropyl)phenyl, 3,5-di(isobutyl)phenyl, dibenzo-lH-pyrrole--yl, or anthracen-5-yl,
  • R21 is hydrogen, halo, or CI -4 alkyl, especially methyl
  • T4 is propan-l,3-diyl or butan-l,4-diyl
  • G is chloro, methyl or benzyl.
  • the foregoing polyvalent Lewis base complexes are conveniently prepared by standard metallation and ligand exchange procedures involving a source of the Group 4 metal and the neutral polyfunctional ligand source.
  • the complexes may also be prepared by means of an amide elimination and hydrocarbylation process starting from the corresponding Group 4 metal tetraamide and a hydrocarbylating agent, such as
  • These polymers can be made using gas phase, slurry or solution processes as is commonly known in the art.
  • the first polymer may comprise a blend of two or more materials which each comprise a first polymer as described above.
  • the required second polymer for use in the seal layer of the present invention can be any resin so long as it has an interfacial adhesion with the first polymer of less than 4.5 N/inch, preferably less than 3.5, more preferably less than 2.5 N/inch.
  • Such materials may include polystyrene, polyacrylates, ethylene carboxylic acid (or their derivatives) copolymers or terpolymers (including EVA, EAA, EMAA, EEA), as well as low density polyethylene.
  • LDPE polyethylene type resins known in the art as "LDPE”.
  • LDPE may also be referred to as "high pressure ethylene polymer” or “high pressure low density type resin” or “highly branched polyethylene” and is defined to mean that the polymer is partly or entirely homopolymerized or copolymerized in autoclave or tubular reactors at pressures above 14,500 psi (100 MPa) with the use of free-radical initiators, such as peroxides (see for example US 4,599,392, herein incorporated by reference).
  • LDPE having a melt index (ASTM D-1238, 2.16kg, 190° C) in the range of 0.5 to 20 g/lOmin, optionally in the range of 1 to 15 g/10 min .
  • Ethylene carboxylic acid (or their derivative) copolymers having low comonomer content (e.g. less than 4 percent by weight) may also be preferred for certain applications.
  • HDPE high density polyethylene
  • ethylene-polar comonomer copolymers it is generally preferred that the polymer have an MI in the range of from 0.5 tolO g/ 10 min.
  • polymeric materials which may be included in the peelable seal layer in addition to the first polymer and the second polymer include homopolymer polypropylene and/or polystyrene. If homopolymer polypropylene is present, it is preferred that it comprise no more than 30% by weight of the seal layer, more preferably in the range of 5 to 30%. Homopolymer polypropylene having am MFR of from 0.5 to 10 g/10 min (ASTM D-1238, 2.16 kg, 230 ° C) is generally preferred.
  • polystyrene it is generally preferred that it comprise no more than 10 percent of the seal layer, more preferably in the range of from 5 to 10%, and have a melt flow rate(ASTM D-1238, 2.16 kg, 190 ° C) from 0.5 to 10 g/10 min.
  • the second polymer may comprise a blend of two or more materials which each comprise a second polymer as described above.
  • HDPE which is not necessarily a second polymer in the seal layer of the present invention.
  • the presence of HDPE in addition to the first and second polymer helps in maintaining desired peel force.
  • the seal layer of the present invention may also contain additives as known in the art.
  • additives include materials such as inorganic fillers such as talc, conductive fillers, pigments, nucleators, clarifiers, antioxidants, acid scavengers, flame retardants, ultraviolet absorbers, processing aids such as zinc stearate, extrusion aids, slip additives, tackifiers, permeability modifiers, anti- static agents and antiblock additives.
  • inorganic fillers such as talc, conductive fillers, pigments, nucleators, clarifiers, antioxidants, acid scavengers, flame retardants, ultraviolet absorbers, processing aids such as zinc stearate, extrusion aids, slip additives, tackifiers, permeability modifiers, anti- static agents and antiblock additives.
  • processing aids such as zinc stearate, extrusion aids, slip additives, tackifiers, permeability modifiers, anti- static agents and antiblock additives.
  • the seal layer of the present invention may be coextruded, laminated, etc to other layers to form the peelable film as is generally known in the art. It is preferred that the seal layer has a thickness less than 30 microns, preferably less than 20 microns, more preferably 10 microns or less. It is preferred that the film have a total thickness of less than 200 microns, more preferably less than 150 microns.
  • peelable seals generally have a defined seal strength in the range of 1 to 9 lbs./inch.
  • a heat seal strength in the range of 2 to 3 lbs. /inch is commonly specified, although specific targets vary according to individual manufacturer's requirements.
  • a peelable seal is in the form of a film or layer.
  • a peelable seal can be a monolayer or multilayer.
  • a peelable seal may include two layers: one sealant layer and a base layer for support.
  • a peelable seal may include three layers: a sealant layer which is one of the outer layers and two base layers which may or may not have the same compositions.
  • Multiple layer structures, such as a four layered structure, five layered structure, six layered structure, or more layers, may also be made, if desired, so long as at least one of the outer layers is a heat sealant layer which is made from the polymer blend described herein.
  • the interfacial tension of Resin C with each of the other resins is less than 1 .5 N.
  • Blown films are made on a 3 layer coextrusion blown film line manufactured by Dr. Colin GmbH.
  • Monolayer or co-ex film structures are created using multiple extruders (25mm (Ex25A), 30mm (Ex.30) and 25mm (Ex.25B)).
  • An average total output of all the three extruders is 10-11 kg/hr, and this is calculated using the gravimetric feeding system equipped on each extruder.
  • Each extruder has a standard single flight forwarding screw in which optional mixing heads can be attached at the end. However, standard practice is no mixing heads, so none are used in these examples.
  • the die diameter is 60mm, and multiple die gap options with the "standard" being 2mm (as used in this project).
  • Maximum takeoff speed of the line is 30 m/min, and will run as slow as material allows with stability (typically around 4 m/min).
  • a typical BUR (blow up ratio) used is 2.5:1, but during this project it was requested to go to the highest allowable ratio, which came out to be approximately 3.2:1 for each sample.
  • An average takeoff speed during this project was 6.8 m/min.
  • all three extruders are used for all applications to give the highest level of orientation in the film as possible. This typically requires a minimum of approximately 30 lb of each material needed.
  • the retort (steam sterilization) process is performed on a LI 250 laboratory steam sterilizer.
  • the model is AMSCO LAB 250 from Steris.
  • the chamber starts at 71°C, then is ramped up over a period of approximately 15 minutes to a temperature of 122 degrees. This temperature is held for approximately 60 minutes, and then heating is turned off. After about 25 minutes the temperature reaches a temperature of approximately 99 degrees at which time the samples were removed from the chamber.
  • a the chamber is pressurized to 18psig using compressed air.
  • Table 2 lists the formulation of comparative and inventive peel sealant compounds. 72381-US-NP
  • composition B Variable composition as described below
  • B Variable composition as described below Expected Failure Burst + Burst + Burst + Burst + Burst + Burst + Burst +
  • the heat seal test is based upon ASTM F88-06, Standard Test Method for Seal Strength of Flexible Barrier Materials.
  • the film-to-film heat seal is conducted on an Enepay MAGMA Hot Tack and Heat Seal Test System.
  • the film is folded with the sealant side facing each other.
  • the films are sandwiched by a 50 ⁇ thick Mylar PET film prior to being inserted in between the upper and lower seal bars which were perpendicular to the film machine direction.
  • the flat jaw is loaded.
  • the films are sealed at specified temperatures for 0.5 seconds under a constant pressure of 0.275 N/mm2, and allowed to cool completely to room temperature (23°C).
  • the specimens are
  • the temperature increment for the measurement is 10°C between 70°C and 110°C, then 20°C between 110°C and 170°C.
  • Blocking, or other change in the dimensions of the seal during the retort process were noted in tables 2 and 3.
  • the sealed samples are conditioned in ASTM environment for 48 hours prior to peel test. Five 1x6 inch strips across the seal bar are punched by a NAEF PUNCH PRESS. The strip is then gripped and peeled by an INSTRON Model 1122, made by INSTRU-MET Corporation. The INSTRON is operated with pneumatic grips, separating the two specimen legs at 180°, leaving the sealed area at 90° with each leg (unsupported protocol), starting from an initial distance between the two grips of about 10 mm, and using a constant separation speed of 254 mm/min.
  • Hot tack properties of the sample films is measured using an Enepay MAGMA Hot
  • RCPP based "buried" peel seal compositions show undesirable stringing phenomena during peeling, which is believed to be due to the partial delamination between the peel layer and the backing layer, (comparative examples 1-4 in table 2)
  • RCPP based surface peel seal compositions experience blocking during the retort process.
  • Inventive PP based surface peel seal compositions have neither stringing nor blocking issue.

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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)
  • Crystallography & Structural Chemistry (AREA)
  • Laminated Bodies (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
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Abstract

L'invention porte sur une composition de matière convenant particulièrement bien à une utilisation en tant que couche de scellement pelable. La composition comprend d'environ 50 à environ 85 pourcents en poids d'un premier polymère et de 15 à 50 pourcents d'un deuxième polymère. Le premier polymère est un polymère à base de propylène, caractérisé en ce qu'il a un point de fusion d'au moins 125 °C en même temps qu'une Largeur de Distribution de la Composition en Comonomères ("CCDB") inférieure à 2. Le deuxième polymère est caractérisé en ce qu'il a une adhérence interfaciale avec le premier polymère inférieure à 1 lb/inch.
PCT/US2014/061755 2013-10-25 2014-10-22 Composition de polyéthylène et de polypropylène convenant à une utilisation en tant qu'opercules souples à ouverture facile WO2015061440A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022106201A1 (fr) 2020-11-17 2022-05-27 Basell Poliolefine Italia S.R.L. Composition pelable

Citations (13)

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