CA2326808A1 - Oriented, propylene polymer film with improved oxygen barrier property - Google Patents
Oriented, propylene polymer film with improved oxygen barrier property Download PDFInfo
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- CA2326808A1 CA2326808A1 CA002326808A CA2326808A CA2326808A1 CA 2326808 A1 CA2326808 A1 CA 2326808A1 CA 002326808 A CA002326808 A CA 002326808A CA 2326808 A CA2326808 A CA 2326808A CA 2326808 A1 CA2326808 A1 CA 2326808A1
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- 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
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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
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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
- C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L51/06—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
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- 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
- C08J2351/00—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
- C08J2351/06—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
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- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Materials Engineering (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
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Abstract
Disclosed is oriented, propylene polymer film, the oxygen barrier property of which is substantially improved. The improvement is achieved by incorporating in the propylene polymer composition from which the film is made grafted copolymer material comprising predominantely crystalline, propylene polymer material, the polymer or polymers of which have grafts of polymerized monomer material of a group that includes styrene, p-alkylstyrenes, acrylic acid, alkacrylic acids, alkyl alkacrylates, acrylonitrile and, with or without ethylene, vinyl acetate.
Description
wo ooiaasis rcr~sooiooo6o TITLE OF THE INVENTION
Oriented, Propylene Polymer Film With Improved Oxygen Barrier Property CROSS-REFERENCE TO RELATED APPLICATIONS
Not Applicable STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR
DEVELOPMENT
Not Applicable FIELD OF INVENTION
This invention resides in the chemical arts. It relates to film formed from polymers of 1o propylene.
BACKGROUND OF INVENTION
Predominately crystalline homopolymer of propylene, the polypropylene of commerce, has achieved tonnage use in many applications. One of them is the manufacture of film, especially biaxially oriented film used in the packaging of, for example, snack foods 1s such as potato chips and the like. Indeed, such film has become known as "BOPP" film.
Polypropylene film, while having advantageous properties, for example, chemical resistance and excellent barrier to moisture, is not a good burner to oxygen;
oxygen transmission through the film is too high for many packaging film uses. This problem of oxygen barrier property also exists in the case of films formed from predominately 2o crystalline, random copolymers of propylene and other 1-olefins such as ethylene and 1-butene. Efforts to solve this problem have included laminating the film with film of another synthetic resin having a good oxygen burner property, and incorporating additives such as, for example, so-called hard resin, in the propylene polymer composition from which the film is formed. For one reason or another, such efforts have not been entirely satisfactory.
CONftRMAT'ION COPY
BRIEF SUMMARY OF THE INVENTION
This invention is based on the discovery that melt blending with predominantly crystalline polypropylene a graft copolymer of predominantly crystalline polypropylene and certain polymerized monomer material gives a composition that in the form of biaxially oriented film is a good barrier to oxygen transmission. However, the invention is broader than this discovery.
The invention, in summary, broadly comprises oriented film formed from a melt blend consisting essentially of (1) propylene polymer material selected from the group consisting of predominantly 1o crystalline polypropylene and predominantly crystalline copolymers and terpolymers of propylene and 1-olefin material selected from the group consisting of ethylene and the butenes, which copolymers and terpolymers have more than 50 mole % propylene units; and (2) graft copolymer material selected from the group consisting of graft copolymers of 15 (a) propylene polymer material selected from the group consisting of predominantly crystalline polypropylene and predominantly crystalline copolymers and terpolymers of propylene and 1-olefin material selected from the group consisting of ethylene and the butenes, which copolymers and terpolymers have more than 50 mole % propylene units, and 20 (b) polymerized monomer material selected from the group of monomers consisting of styrene, p-alkylstyrenes, acrylic acid, alkacrylic acids, alkyl acrylates, alkyl alkacrylates, acrylonitrile, and vinyl acetate with or without ethylene, the alkyls in these monomers with alkyl substituents having one-four carbons, the concentration of the graft copolymer material being such that the rate of oxygen 25 transmission through the film is substantially less than if no graft copolymer material were present.
DETAILED DESCRIPTION OF THE INVENTION
The propylene polymer material in one general embodiment of the blend from which the oriented film of this invention is formed is composed of only one propylene polymer of 3o the recited group. In another general embodiment it is composed of more than one such polymer. All of the members of the goup from which the propylene polymer material is selected, and processes for making them, are generally known.
The gaff copolymer material in one general embodiment of the blend from which the oriented film of this invention is formed is composed of only one gaff copolymer of the recited group. In another general embodiment it is composed of more than one such grafted polymer. In more specific embodiments of these general embodiments, the grafted, polymerized monomer material comprises only one grafted, polymerized monomer.
In other, more specific embodiments of these general embodiments, the gaffed, polymerized monomer material comprises more than one gaffed, polymerized monomer. The members of 1o the group of gaff copolymers, and processes for making them, are generally known.
Examples of such processes are a radiation process such as that disclosed in EP 519, 341, issued August 14,1996, and a. peroxide process such as that disclosed in the same patent. The relevant disclosures of this patent are incorporated herein by reference.
In both processes, and especially in the peroxide process, a significant amount (as 15 much as 80 weight % of the graft copolymer product remaining after removal of unreacted monomer material) of the propylene polymer material is not gaffed. Hence, in some embodiments the gaff copolymer product furnishes not only the gaff copolymer material component, but all of the propylene polymer material component of the blend.
However, in most embodiments the gaff copolymer product supplies only part of the propylene product 2o material.
Also, in both processes, and especially in the peroxide process, non-grafted polymerized monomer material is formed. The quantity of such can be as much as 50% by weight of the gaff copolymer material product of the process in each case.
However, the presence of such in the melt blend generally can be tolerated.
25 In general, satisfactory results are obtained with the concentration of the graft copolymer material in the blend being about 10-90 weight % of the propylene polymer material.
In addition to the essential components, that is, the propylene polymer material and the gaff copolymer material, most embodiments of the melt blend comprise at conventional 30 concentrations stabilizer material selected from the group consisting of antioxidants, heat stabilizers, ultraviolet tight inhibitors, and the like. Moreover, embodiments of the melt blend can comprise at conventional concentrations other additives, for example, nucleating WO 00/44$15 PCT/I800/00060 agent material, filler material, extender material, colorant material, antacid material, mechanical property improver material (for example, a polyolefin type rubber such as ethylene-octene copolymer rubber), and the like.
The melt blend and the oriented film thereof are made by conventional ways and means.
While most embodiments of the oriented film of this invention are in biaxial orientation, film of monoaxial orientation is within the broader concepts of this invention.
The best mode now contemplated of carrying out the invention is depicted by Examples 1-23 set forth in the following tables. These Examples illustrate specific to embodiments of the oriented film of this invention, their compositions, and typical data including oxygen transmission data obtained in physical testing of them.
These data were obtained in work in which oriented film samples of the formulations set forth in the following tables were made, and the physical properties indicated in the tables were measured.
15 In that work grafted copolymer products were made by the peroxide process.
The starting propylene polymer material for such products consisted of a propylene homopolymer resin (polymer + conventional stabilizer material, added at the time of production of the polymer, at a concentration intended to stabilize the polymer until it is compounded for use) commercially available from Montell USA Inc. as KPO10.
Typical 2o properties of this resin include: spherical particles; melt flow rate = 10 dg/min at 230oC and 2. l6Kg; porosity = 0.44 cc/g; and room temperature xylene insoluble fraction:
96.5 wt%.
The monomer material used to make the various grafted polymers were these mixtures: methyl methacrylate and methyl acrylate, methyl methacrylate and methacrylic acid, and methyl methacrylate and acrylonitrile. The concentration of the methyl acrylate in 2s these mixtures was 5 mole %.
The peroxide was t-butyl peroxy-2-ethyl hexanoate. It was used while in solution (50 wt%) in mineral spirits. The solution is commercially available from Elf Atochem North America, Inc., as Lupersol PMS.
In each Example 100 parts (all parts are by weight) of the resin were introduced into 3o a mechanically agitated reactor, the interior of the reactor was inerted by nitrogen flushing, and the reactor contents were heated to and maintained at reaction temperature. Then, 95 parts of monomer material per 100 parts of resin were introduced into the reactor at the rate per minute of 1 part of monomer material per 100 parts of resin, while at the same time the peroxide solution was introduced into the reactor~at a rate equivalent to 1 mole of peroxide per 100 moles of monomer material being introduced. After introduction of the monomer material and the peroxide solution were completed, and while continuing agitation of the reactor contents, they were maintained at 125oC for 30 minutes, and then the temperature was raised to 140oC for 1.5-2.0 hours while purging with nitrogen residual monomer material from the graft copolymer product particles.
A sample of the composition of each Example, the formulation of which is set forth to in the tables, was prepared by admixing graft copolymer particles with particles of a broad molecular weight distribution polypropylene resin ("BMWD PP"), and additional stabilizer material. The resin is commercially available from Montell USA Inc. as KM210.
Typical properties of this resin include: Mw/Mn >6; melt flow rate = 1.1 g/min at 230oC and 2. l6Kg; and room temperature xylene insoluble fraction = 97.8 wt%. The quantity of BMWD PP in the sample was such as to give the Effective Add Level of the total polymerized monomer material (both that which was grafted to the KPO10 polymer, and that which was not gaffed to the KPO10 polymer) reported for the Example in the following tables. The stabilizer material in all examples comprised a conventional-for-film antacid and a conventional-for-ftlrn phenolic antioxidant at a 1:4 wt ratio. In Example 5, however, the 2o stabilizer material comprised a different, but conventional-for-film, antacid, a different, but conventional-for-film, phenolic antioxidant, and a conventional-for-film, phosphite type stabilizer at approximately a 1:1:1 wt ratio. While the different composition of the stabilizer material in Example 5 is believed not to have skewed the results, it is reported here for accuracy. In this regard, because the stabilizer material is not at the heart,of the invention, it is not considered necessary to enable the best mode to be practiced to identify specifically the stabilizer material components, as long as the chemical types of the components are disclosed.
Each sample was melt extruded from either a 34 mm co-rotating, intermeshing Leistritz LSM twin screw extruder at a barrel temperature of 240oC, a screw speed of 250 rpm, and a throughput rate of 13.6 kg/hr, or a 40mm co-rotating, intermeshing Werner &
Pfleiderer ZSK twin screw extruder at a barrel temperature of 210oC, a screw speed of 500 rpm, and a throughput rate of 73 kg/hr.
The thus extruded sample was cast at 250oC into a 25 mil (635aem) thick sheet which was quenched on a water-cooled chill roll.
Subsequently, all four sides of a 2 in (5.1 cm) by 2 in (5.1 cm) specimen of the sheet were clamped on a TM Long stretcher, and after being heated to a temperature of 140-160oC
the specimen was stretched biaxially by the machine at the stretch rate of 9000% per min to a stretch ratio of 6:1 in both directions. The thickness of the thus obtained biaxially oriented film specimen was approximately 1 mil (25aem).
All film specimens thus obtained were aged at 23oC and 50% relative humidity for at least two weeks. Thereafter the following physical properties were measured by the indicated 1o methods.
Tensile Strength, Young's Modulus and ASTM D882 Elongation-(7a,-break Oxygen transmission rate ("OTR") ASTM D3985-81 (at 23.3oC and dry condition) [The OTR is expressed as "cc x miUm2/24hrs", (equivalent to "cc x ZSxm /m2/24hrs").]
Haze and clarity Measured with a Byk Gardner YK Haze-Guard meter The following tables set forth the composition of the oriented film of each Example, 2o and the data obtained in measuring the physical properties thereof. These data were obtained on samples made at different times. In the case of multiple samples of a composition made at different times there were normal variations in the physical measurement data.
These were averaged and the averages are reported in the tables along with the number of values averaged as indicated in the "No. of Data Points" lines.
Further, the first table includes for comparison the data obtained on a commercial, film grade, polypropylene resin (polypropylene + conventional stabilizer material).
Abbreviations in the tables, and their meanings, are:
"AN" means acrylonitrile.
"MAA" means methacrylic acid.
"MeAc" means methyl acrylate.
"PP" means polypropylene.
"PP-g-PMMA" means the graft copolymer product that consists essentially of polypropylene grafted with polymerized methyl methacrylate and polymerized methyl acrylate.
"PP-g-PMMA/AN" means the graft copolymer product that consists essentially of polypropylene grafted with polymerized methyl methacrylate and polymerized acrylonitrile.
"PP-g-PMMA/MAA" means the graft copolymer product that consists essentially of polypropylene grafted with polymerized methyl methacrylate and polymerized methacrylic acid.
"na" means not available.
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Oriented, Propylene Polymer Film With Improved Oxygen Barrier Property CROSS-REFERENCE TO RELATED APPLICATIONS
Not Applicable STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR
DEVELOPMENT
Not Applicable FIELD OF INVENTION
This invention resides in the chemical arts. It relates to film formed from polymers of 1o propylene.
BACKGROUND OF INVENTION
Predominately crystalline homopolymer of propylene, the polypropylene of commerce, has achieved tonnage use in many applications. One of them is the manufacture of film, especially biaxially oriented film used in the packaging of, for example, snack foods 1s such as potato chips and the like. Indeed, such film has become known as "BOPP" film.
Polypropylene film, while having advantageous properties, for example, chemical resistance and excellent barrier to moisture, is not a good burner to oxygen;
oxygen transmission through the film is too high for many packaging film uses. This problem of oxygen barrier property also exists in the case of films formed from predominately 2o crystalline, random copolymers of propylene and other 1-olefins such as ethylene and 1-butene. Efforts to solve this problem have included laminating the film with film of another synthetic resin having a good oxygen burner property, and incorporating additives such as, for example, so-called hard resin, in the propylene polymer composition from which the film is formed. For one reason or another, such efforts have not been entirely satisfactory.
CONftRMAT'ION COPY
BRIEF SUMMARY OF THE INVENTION
This invention is based on the discovery that melt blending with predominantly crystalline polypropylene a graft copolymer of predominantly crystalline polypropylene and certain polymerized monomer material gives a composition that in the form of biaxially oriented film is a good barrier to oxygen transmission. However, the invention is broader than this discovery.
The invention, in summary, broadly comprises oriented film formed from a melt blend consisting essentially of (1) propylene polymer material selected from the group consisting of predominantly 1o crystalline polypropylene and predominantly crystalline copolymers and terpolymers of propylene and 1-olefin material selected from the group consisting of ethylene and the butenes, which copolymers and terpolymers have more than 50 mole % propylene units; and (2) graft copolymer material selected from the group consisting of graft copolymers of 15 (a) propylene polymer material selected from the group consisting of predominantly crystalline polypropylene and predominantly crystalline copolymers and terpolymers of propylene and 1-olefin material selected from the group consisting of ethylene and the butenes, which copolymers and terpolymers have more than 50 mole % propylene units, and 20 (b) polymerized monomer material selected from the group of monomers consisting of styrene, p-alkylstyrenes, acrylic acid, alkacrylic acids, alkyl acrylates, alkyl alkacrylates, acrylonitrile, and vinyl acetate with or without ethylene, the alkyls in these monomers with alkyl substituents having one-four carbons, the concentration of the graft copolymer material being such that the rate of oxygen 25 transmission through the film is substantially less than if no graft copolymer material were present.
DETAILED DESCRIPTION OF THE INVENTION
The propylene polymer material in one general embodiment of the blend from which the oriented film of this invention is formed is composed of only one propylene polymer of 3o the recited group. In another general embodiment it is composed of more than one such polymer. All of the members of the goup from which the propylene polymer material is selected, and processes for making them, are generally known.
The gaff copolymer material in one general embodiment of the blend from which the oriented film of this invention is formed is composed of only one gaff copolymer of the recited group. In another general embodiment it is composed of more than one such grafted polymer. In more specific embodiments of these general embodiments, the grafted, polymerized monomer material comprises only one grafted, polymerized monomer.
In other, more specific embodiments of these general embodiments, the gaffed, polymerized monomer material comprises more than one gaffed, polymerized monomer. The members of 1o the group of gaff copolymers, and processes for making them, are generally known.
Examples of such processes are a radiation process such as that disclosed in EP 519, 341, issued August 14,1996, and a. peroxide process such as that disclosed in the same patent. The relevant disclosures of this patent are incorporated herein by reference.
In both processes, and especially in the peroxide process, a significant amount (as 15 much as 80 weight % of the graft copolymer product remaining after removal of unreacted monomer material) of the propylene polymer material is not gaffed. Hence, in some embodiments the gaff copolymer product furnishes not only the gaff copolymer material component, but all of the propylene polymer material component of the blend.
However, in most embodiments the gaff copolymer product supplies only part of the propylene product 2o material.
Also, in both processes, and especially in the peroxide process, non-grafted polymerized monomer material is formed. The quantity of such can be as much as 50% by weight of the gaff copolymer material product of the process in each case.
However, the presence of such in the melt blend generally can be tolerated.
25 In general, satisfactory results are obtained with the concentration of the graft copolymer material in the blend being about 10-90 weight % of the propylene polymer material.
In addition to the essential components, that is, the propylene polymer material and the gaff copolymer material, most embodiments of the melt blend comprise at conventional 30 concentrations stabilizer material selected from the group consisting of antioxidants, heat stabilizers, ultraviolet tight inhibitors, and the like. Moreover, embodiments of the melt blend can comprise at conventional concentrations other additives, for example, nucleating WO 00/44$15 PCT/I800/00060 agent material, filler material, extender material, colorant material, antacid material, mechanical property improver material (for example, a polyolefin type rubber such as ethylene-octene copolymer rubber), and the like.
The melt blend and the oriented film thereof are made by conventional ways and means.
While most embodiments of the oriented film of this invention are in biaxial orientation, film of monoaxial orientation is within the broader concepts of this invention.
The best mode now contemplated of carrying out the invention is depicted by Examples 1-23 set forth in the following tables. These Examples illustrate specific to embodiments of the oriented film of this invention, their compositions, and typical data including oxygen transmission data obtained in physical testing of them.
These data were obtained in work in which oriented film samples of the formulations set forth in the following tables were made, and the physical properties indicated in the tables were measured.
15 In that work grafted copolymer products were made by the peroxide process.
The starting propylene polymer material for such products consisted of a propylene homopolymer resin (polymer + conventional stabilizer material, added at the time of production of the polymer, at a concentration intended to stabilize the polymer until it is compounded for use) commercially available from Montell USA Inc. as KPO10.
Typical 2o properties of this resin include: spherical particles; melt flow rate = 10 dg/min at 230oC and 2. l6Kg; porosity = 0.44 cc/g; and room temperature xylene insoluble fraction:
96.5 wt%.
The monomer material used to make the various grafted polymers were these mixtures: methyl methacrylate and methyl acrylate, methyl methacrylate and methacrylic acid, and methyl methacrylate and acrylonitrile. The concentration of the methyl acrylate in 2s these mixtures was 5 mole %.
The peroxide was t-butyl peroxy-2-ethyl hexanoate. It was used while in solution (50 wt%) in mineral spirits. The solution is commercially available from Elf Atochem North America, Inc., as Lupersol PMS.
In each Example 100 parts (all parts are by weight) of the resin were introduced into 3o a mechanically agitated reactor, the interior of the reactor was inerted by nitrogen flushing, and the reactor contents were heated to and maintained at reaction temperature. Then, 95 parts of monomer material per 100 parts of resin were introduced into the reactor at the rate per minute of 1 part of monomer material per 100 parts of resin, while at the same time the peroxide solution was introduced into the reactor~at a rate equivalent to 1 mole of peroxide per 100 moles of monomer material being introduced. After introduction of the monomer material and the peroxide solution were completed, and while continuing agitation of the reactor contents, they were maintained at 125oC for 30 minutes, and then the temperature was raised to 140oC for 1.5-2.0 hours while purging with nitrogen residual monomer material from the graft copolymer product particles.
A sample of the composition of each Example, the formulation of which is set forth to in the tables, was prepared by admixing graft copolymer particles with particles of a broad molecular weight distribution polypropylene resin ("BMWD PP"), and additional stabilizer material. The resin is commercially available from Montell USA Inc. as KM210.
Typical properties of this resin include: Mw/Mn >6; melt flow rate = 1.1 g/min at 230oC and 2. l6Kg; and room temperature xylene insoluble fraction = 97.8 wt%. The quantity of BMWD PP in the sample was such as to give the Effective Add Level of the total polymerized monomer material (both that which was grafted to the KPO10 polymer, and that which was not gaffed to the KPO10 polymer) reported for the Example in the following tables. The stabilizer material in all examples comprised a conventional-for-film antacid and a conventional-for-ftlrn phenolic antioxidant at a 1:4 wt ratio. In Example 5, however, the 2o stabilizer material comprised a different, but conventional-for-film, antacid, a different, but conventional-for-film, phenolic antioxidant, and a conventional-for-film, phosphite type stabilizer at approximately a 1:1:1 wt ratio. While the different composition of the stabilizer material in Example 5 is believed not to have skewed the results, it is reported here for accuracy. In this regard, because the stabilizer material is not at the heart,of the invention, it is not considered necessary to enable the best mode to be practiced to identify specifically the stabilizer material components, as long as the chemical types of the components are disclosed.
Each sample was melt extruded from either a 34 mm co-rotating, intermeshing Leistritz LSM twin screw extruder at a barrel temperature of 240oC, a screw speed of 250 rpm, and a throughput rate of 13.6 kg/hr, or a 40mm co-rotating, intermeshing Werner &
Pfleiderer ZSK twin screw extruder at a barrel temperature of 210oC, a screw speed of 500 rpm, and a throughput rate of 73 kg/hr.
The thus extruded sample was cast at 250oC into a 25 mil (635aem) thick sheet which was quenched on a water-cooled chill roll.
Subsequently, all four sides of a 2 in (5.1 cm) by 2 in (5.1 cm) specimen of the sheet were clamped on a TM Long stretcher, and after being heated to a temperature of 140-160oC
the specimen was stretched biaxially by the machine at the stretch rate of 9000% per min to a stretch ratio of 6:1 in both directions. The thickness of the thus obtained biaxially oriented film specimen was approximately 1 mil (25aem).
All film specimens thus obtained were aged at 23oC and 50% relative humidity for at least two weeks. Thereafter the following physical properties were measured by the indicated 1o methods.
Tensile Strength, Young's Modulus and ASTM D882 Elongation-(7a,-break Oxygen transmission rate ("OTR") ASTM D3985-81 (at 23.3oC and dry condition) [The OTR is expressed as "cc x miUm2/24hrs", (equivalent to "cc x ZSxm /m2/24hrs").]
Haze and clarity Measured with a Byk Gardner YK Haze-Guard meter The following tables set forth the composition of the oriented film of each Example, 2o and the data obtained in measuring the physical properties thereof. These data were obtained on samples made at different times. In the case of multiple samples of a composition made at different times there were normal variations in the physical measurement data.
These were averaged and the averages are reported in the tables along with the number of values averaged as indicated in the "No. of Data Points" lines.
Further, the first table includes for comparison the data obtained on a commercial, film grade, polypropylene resin (polypropylene + conventional stabilizer material).
Abbreviations in the tables, and their meanings, are:
"AN" means acrylonitrile.
"MAA" means methacrylic acid.
"MeAc" means methyl acrylate.
"PP" means polypropylene.
"PP-g-PMMA" means the graft copolymer product that consists essentially of polypropylene grafted with polymerized methyl methacrylate and polymerized methyl acrylate.
"PP-g-PMMA/AN" means the graft copolymer product that consists essentially of polypropylene grafted with polymerized methyl methacrylate and polymerized acrylonitrile.
"PP-g-PMMA/MAA" means the graft copolymer product that consists essentially of polypropylene grafted with polymerized methyl methacrylate and polymerized methacrylic acid.
"na" means not available.
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Other embodiments and features of advantage of this invention will become readily apparent to those exercising ordinary skill in the art after reading the foregoing disclosures.
Such embodiments are within the spirit and scope of the claimed subject matter unless expressly excluded therefrom by claim language or by not being within the doctrine of equivalents.
DEFINITIONS
The term "film" as used in this specification means a sheet, the thickness of which is l0 10 mils (254 aem) or less.
The expression "consisting essentially of in this specification excludes an unrecited substance at a concentration suffcient to substantially adversely affect the essential properties and characteristics of the composition of matter being defined, while permitting the presence of one or more unrecited substances at a concentration or concentrations 15 insufficient to substantially adversely affect said essential properties and characteristics.
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p ::;
C :
;:,%i :z:%.~.t~,~.x<::;::.:..:
. .;.., :..,:.n,.: . r: ...r ,v: a3 ;::.: C: :~
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:~,.sy'~..::::.g.;.~.,.s~:..:.:v:>;: ~ .wr :: ~ O O ...n : : O
.;:::G:;.:..:.~..a~.'.x;x.:.,.::,:
~~~... .. . ........ :.' ' ':: ..'~.';' ~::r' ss;;:":~;;rs.~...:: .~: w v) ;.' :. .... .... . ~ ~<~~u~' oa .>.. x ~ H w '~ o ,? : .. , . ..... :.... z The data of the above tables demonstrate the outstanding oxygen barrier properties of the oriented film of this invention.
Other embodiments and features of advantage of this invention will become readily apparent to those exercising ordinary skill in the art after reading the foregoing disclosures.
Such embodiments are within the spirit and scope of the claimed subject matter unless expressly excluded therefrom by claim language or by not being within the doctrine of equivalents.
DEFINITIONS
The term "film" as used in this specification means a sheet, the thickness of which is l0 10 mils (254 aem) or less.
The expression "consisting essentially of in this specification excludes an unrecited substance at a concentration suffcient to substantially adversely affect the essential properties and characteristics of the composition of matter being defined, while permitting the presence of one or more unrecited substances at a concentration or concentrations 15 insufficient to substantially adversely affect said essential properties and characteristics.
Claims (9)
1. Oriented film formed from a melt blend consisting essentially of (1) propylene polymer material selected from the goup consisting of predominately crystalline polypropylene and predominately crystalline copolymers and terpolymers of propylene and 1-olefin material selected from the group consisting of ethylene and the butenes, which copolymers and terpolymers have more than 50 mole % propylene units; and (2) graft copolymer material selected from the goup consisting of graft copolymers of (a) propylene polymer material selected from the goup consisting of predominately crystalline polypropylene and predominately crystalline copolymers and terpolymers of propylene and 1-olefin material selected from the group consisting of ethylene and the butenes, which copolymers and terpolymers have more than 50 mole % propylene units, and (b) polymerized monomer material selected from the goup of monomers consisting of styrene, p-alkylstyrenes, acrylic acid, alkacrylic acids, alkyl acrylates, alkyl alkacrylates, acrylonitrile and, with or without ethylene, vinyl acetate, the alkyls in these monomers with alkyl substituents having one-four carbons, the concentration of the graft copolymer material being such that the rate of oxygen transmission through the film is substantially less than if no graft copolymer material were present.
2. Film according to claim 1, in which the concentration of said graft copolymer material in said blend is about 10-90 weight % of the propylene polymer material.
3. Film according to claim 2 in which said blend comprises non-grafted polymerized monomer material at about 1-50 weight % of the blend.
4. Film according to claim 3 in which said propylene polymer material consists essentially of predominately crystalline polypropylene.
5. Film according to claim 4 in which said grafted copolymer material consists essentially of predominately crystalline polypropylene grafted with polymerized alkyl alkacrylate and alkyl acrylate.
6. Film according to claim 5 in which said alkyl alkacrylate is methyl methacrylate, and said alkyl acrylate is methyl acrylate.
7. Film according to claim 5 in which said predominately crystalline polypropylene also is grafted with polymerized alkacrylic acid and alkyl alkacrylate.
8. Film according to claim 7 in which said alkacrylic acid is methacrylic acid, and said alkyl alkacrylate is methyl methacrylate.
9. Film according to claim 5 in which said predominately crystalline polypropylene also is grafted with polymerized acrylonitrile.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US24021899A | 1999-01-29 | 1999-01-29 | |
| US09/240,218 | 1999-01-29 | ||
| PCT/IB2000/000060 WO2000044815A1 (en) | 1999-01-29 | 2000-01-24 | Oriented, propylene polymer film with improved oxygen barrier property |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2326808A1 true CA2326808A1 (en) | 2000-08-03 |
Family
ID=22905627
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002326808A Abandoned CA2326808A1 (en) | 1999-01-29 | 2000-01-24 | Oriented, propylene polymer film with improved oxygen barrier property |
Country Status (12)
| Country | Link |
|---|---|
| EP (1) | EP1102805A1 (en) |
| JP (1) | JP2002535466A (en) |
| KR (1) | KR20010072562A (en) |
| CN (1) | CN1293690A (en) |
| AU (1) | AU3068800A (en) |
| BR (1) | BR0004531A (en) |
| CA (1) | CA2326808A1 (en) |
| ID (1) | ID26404A (en) |
| NO (1) | NO20004874L (en) |
| PL (1) | PL343282A1 (en) |
| TR (1) | TR200002823T1 (en) |
| WO (1) | WO2000044815A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100567378C (en) * | 2004-03-05 | 2009-12-09 | 纳幕尔杜邦公司 | Ethylene copolymer-modified oriented polypropylene |
| CN100404115C (en) * | 2005-08-24 | 2008-07-23 | 中国石油天然气股份有限公司 | Grafted styrene modified membrane and preparation method and application thereof |
| KR100660006B1 (en) * | 2006-03-20 | 2006-12-20 | 주식회사 한국종합기술 | Installing structure of noise reduction type track at the heart of city section |
| KR20220049824A (en) | 2020-10-15 | 2022-04-22 | 한화토탈 주식회사 | Composite Resin Composition with Excellent Gas Barrier Properties and Article Molded Therefrom |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5688481A (en) * | 1979-12-21 | 1981-07-17 | Mitsubishi Petrochem Co Ltd | Easily releasable heat-sealing material |
| US5300570A (en) * | 1989-03-01 | 1994-04-05 | Rohm And Haas Company | Plastic articles with compatibilized barrier resin |
| DE3915533A1 (en) * | 1989-05-12 | 1990-11-15 | Hoechst Ag | Printable, metallisable oriented polyolefin film - contg. olefin polymer with polar gps., esp. polypropylene-polyacrylic acid graft copolymer, and another polyolefin |
| AU5576198A (en) * | 1997-01-22 | 1998-08-18 | Mitsubishi Chemical Corporation | Resin film for sealant |
-
2000
- 2000-01-24 PL PL00343282A patent/PL343282A1/en unknown
- 2000-01-24 BR BR0004531-4A patent/BR0004531A/en not_active Application Discontinuation
- 2000-01-24 CN CN00800096A patent/CN1293690A/en active Pending
- 2000-01-24 CA CA002326808A patent/CA2326808A1/en not_active Abandoned
- 2000-01-24 ID IDW20002222A patent/ID26404A/en unknown
- 2000-01-24 KR KR1020007010775A patent/KR20010072562A/en not_active Application Discontinuation
- 2000-01-24 JP JP2000596068A patent/JP2002535466A/en active Pending
- 2000-01-24 AU AU30688/00A patent/AU3068800A/en not_active Abandoned
- 2000-01-24 EP EP00900759A patent/EP1102805A1/en not_active Withdrawn
- 2000-01-24 WO PCT/IB2000/000060 patent/WO2000044815A1/en not_active Application Discontinuation
- 2000-01-24 TR TR2000/02823T patent/TR200002823T1/en unknown
- 2000-09-28 NO NO20004874A patent/NO20004874L/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| JP2002535466A (en) | 2002-10-22 |
| TR200002823T1 (en) | 2000-12-21 |
| PL343282A1 (en) | 2001-08-13 |
| CN1293690A (en) | 2001-05-02 |
| WO2000044815A1 (en) | 2000-08-03 |
| NO20004874D0 (en) | 2000-09-28 |
| AU3068800A (en) | 2000-08-18 |
| NO20004874L (en) | 2000-11-29 |
| ID26404A (en) | 2000-12-21 |
| BR0004531A (en) | 2000-11-21 |
| KR20010072562A (en) | 2001-07-31 |
| EP1102805A1 (en) | 2001-05-30 |
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