US20010038897A1 - Transparent multilayer polypropylene container with barrier protection - Google Patents

Transparent multilayer polypropylene container with barrier protection Download PDF

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Publication number
US20010038897A1
US20010038897A1 US09/901,427 US90142701A US2001038897A1 US 20010038897 A1 US20010038897 A1 US 20010038897A1 US 90142701 A US90142701 A US 90142701A US 2001038897 A1 US2001038897 A1 US 2001038897A1
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United States
Prior art keywords
layer
polypropylene
adhesive
container
evoh
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US09/901,427
Inventor
Kevin Curie
Randolph Davidson
Sahin Emre
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Ball Corp
Original Assignee
Curie Kevin James
Davidson Randolph Lee
Sahin Emre
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Priority to US8211898P priority Critical
Priority to US09/293,401 priority patent/US6677013B1/en
Application filed by Curie Kevin James, Davidson Randolph Lee, Sahin Emre filed Critical Curie Kevin James
Priority to US09/901,427 priority patent/US20010038897A1/en
Publication of US20010038897A1 publication Critical patent/US20010038897A1/en
Assigned to BALL CORPORATION reassignment BALL CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ALCAN PACKAGING FLEXIBLE FRANCE, PECHINEY PLASTIC PACKAGING (CANADA) INC., PECHINEY PLASTIC PACKAGING, INC.
Assigned to ALCAN PACKAGING FLEXIBLE FRANCE reassignment ALCAN PACKAGING FLEXIBLE FRANCE CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: PECHINEY EMBALLAGE FLEXIBLE EUROPE
Abandoned legal-status Critical Current

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/32Layered products comprising a layer of synthetic resin comprising polyolefins
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/06Layered 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
    • B32B27/08Layered 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 synthetic resin
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65DCONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D1/00Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
    • B65D1/02Bottles or similar containers with necks or like restricted apertures, designed for pouring contents
    • B65D1/0207Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by material, e.g. composition, physical features
    • B65D1/0215Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by material, e.g. composition, physical features multilayered
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/13Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1352Polymer or resin containing [i.e., natural or synthetic]
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/13Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1352Polymer or resin containing [i.e., natural or synthetic]
    • Y10T428/1379Contains vapor or gas barrier, polymer derived from vinyl chloride or vinylidene chloride, or polymer containing a vinyl alcohol unit
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/13Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1352Polymer or resin containing [i.e., natural or synthetic]
    • Y10T428/1379Contains vapor or gas barrier, polymer derived from vinyl chloride or vinylidene chloride, or polymer containing a vinyl alcohol unit
    • Y10T428/1383Vapor or gas barrier, polymer derived from vinyl chloride or vinylidene chloride, or polymer containing a vinyl alcohol unit is sandwiched between layers [continuous layer]
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/31504Composite [nonstructural laminate]
    • Y10T428/31725Of polyamide
    • Y10T428/31739Nylon type
    • Y10T428/31743Next to addition polymer from unsaturated monomer[s]
    • Y10T428/31746Polymer of monoethylenically unsaturated hydrocarbon
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/31504Composite [nonstructural laminate]
    • Y10T428/31725Of polyamide
    • Y10T428/3175Next to addition polymer from unsaturated monomer[s]
    • Y10T428/31757Polymer of monoethylenically unsaturated hydrocarbon

Abstract

A multilayer plastic container comprises a layer of a polypropylene and a layer of EVOH directly adjacent the layer of polypropylene wherein at least one of the polypropylene and EVOH layers comprises an adhesive such as maleic anhydride concentrate mixed therein to adhere the layer of polypropylene to the layer of EVOH.

Description

  • This application claims the priority of U.S. provisional patent application Ser. No. 60/082,118 filed on Apr. 17, 1998, the entirety of which is incorporated herein by reference.[0001]
  • BACKGROUND OF THE INVENTION
  • 1. Field of the Invention [0002]
  • This invention relates generally to transparent multilayer containers; specifically, to transparent multilayer containers having a layer of polypropylene and a layer of a barrier material which provides oxygen, carbon dioxide and moisture protection. [0003]
  • 2. Background Art [0004]
  • Many products that can be filled and stored in plastic containers require carbon dioxide, oxygen and moisture barrier protection to keep the products fresh for extended periods of time. Such products include, by way of example only, certain carbonated beverages, fruit juices, beer, sauces, ketchup, jams, jellies and dry foods such as instant coffee and spices. Most commercially acceptable transparent multilayer containers that provide carbon dioxide and oxygen barrier protection are made of at least one layer comprising a polyester such as polyethylene terephthalate (“PET”) and a layer comprising ethylene vinyl alcohol copolymer (“EVOH”). The layer of EVOH in such containers provides excellent carbon dioxide and oxygen barrier protection. EVOH can also act as a chemical or fragrance barrier to keep flavors fresh for various products such as orange juice. [0005]
  • PET has limited moisture barrier protection compared with polypropylene. As a result, liquid products stored in PET containers experience moisture loss resulting in product weight loss and dry products stored in PET containers absorb more moisture than products stored in polypropylene containers. In addition, PET bottles have limited hot fill capabilities due to a low glass transition temperature of PET. Additionally, the injection molding process temperatures of PET and EVOH are significantly different thus creating difficulties in molding these two materials together in, for instance, multi-layer injection molding systems. [0006]
  • It is known to use polypropylene, instead of PET, for an inner and outer layer of multilayer containers in extrusion blow molding applications. One advantage of polypropylene over PET is that polypropylene provides containers with better hot fill properties. Furthermore, polypropylene and EVOH have relatively similar melting temperatures, which makes it easier to maintain proper injection molding or extrusion molding systems. [0007]
  • Unfortunately, however, polypropylene does not bond to EVOH without the assistance of an additional agent. As a result, known containers made with polypropylene and EVOH require a layer of an adhesive between each layer of polypropylene and the layer of EVOH. Accordingly, multilayer polypropylene containers with carbon dioxide and oxygen barrier protection have typically had at least five layers of material: a first layer of polypropylene, a first layer of adhesive, a layer of EVOH, a second layer of adhesive and a second layer of polypropylene. [0008]
  • Additionally, known polypropylene containers with barrier protection have haze values of approximately 29%-35% or greater. While it is known to injection stretch blow mold containers with a single layer of clarified polypropylene to make a transparent bottle having lower haze values, such containers do not have many commercial purposes for food applications because they do not provide significant carbon dioxide or oxygen barrier protection. [0009]
  • SUMMARY OF THE INVENTION
  • The transparent containers of the present invention have a layer comprising polypropylene and a layer comprising a barrier material such as ethylene vinyl alcohol copolymer, nylon or a blend of ethylene vinyl alcohol copolymer and nylon, adjacent to the polypropylene layer wherein at least one of the polypropylene layer and the barrier layer comprises an adhesive mixed therein. [0010]
  • It is one of the principal objectives of the present invention to provide multilayer plastic containers that also provide oxygen, carbon dioxide and moisture barrier protection having a haze value of less than 25%. [0011]
  • It is another object of the present invention to provide containers having a layer of a polypropylene/adhesive mixture and a layer of barrier material directly adjacent the layer of polypropylene/adhesive mixture. [0012]
  • It is another object of the present invention to provide containers having a layer of a polypropylene and a layer of barrier material/adhesive mixture directly adjacent the layer of polypropylene. [0013]
  • It is another object of the present invention to provide commercially acceptable, cost effective containers having a layer comprising polypropylene and a layer comprising a barrier material adjacent to the polypropylene layer, wherein the containers may be used for carbonated beverages, fruit juices, sauces and beer. [0014]
  • It is still another object of the present invention to provide a polypropylene bottle having at least two layers and having a haze value of less than 25%. [0015]
  • It is further an object of the present invention to use two different materials with similar melting temperature to provide more compatible injection molding systems.[0016]
  • BRIEF DESCRIPTION OF DRAWINGS
  • FIG. 1 is a perspective view of a multilayer container according to the present invention. [0017]
  • FIG. 2 is a sectional view of a wall of the container shown in FIG. 1. [0018]
  • FIG. 3 is a perspective view of a preform according to the present invention that is used to make a multilayer container.[0019]
  • DETAILED DESCRIPTION OF THE DRAWINGS
  • Referring now to FIG. 1, there is shown a transparent, multilayer plastic container, specifically a bottle [0020] 10, according to the teaching of the present invention. The bottle 10 has a top end 12 and a bottom end 14. A body portion 20 extends between the top end 12 and the bottom end 14 and forms a cylindrical wall 22. Although the container illustrated is a bottle, it is noted that various other containers can be made according to the present invention as well.
  • As best illustrated in the cross-sectional view of the cylindrical wall [0021] 22 shown in FIG. 2, the bottle 10 is preferably constructed of three layers, namely an inner layer 24, a middle layer 26 and an outer layer 28. Both the inner layer 24 and the outer layer 28, which are structural layers, are made of a material comprising at least polypropylene. The polypropylene can be a homopolymer or a copolymer. The comonomer can be selected from the group consisting of ethylene, butylene, or other alpha-olefins from C5-C8. A preferred comonomer is ethylene wherein the ethylene is up to 3.0 weight % of the polypropylene copolymer. The polypropylene may also contain additives such as clarifying agents. Clarifying agents are exemplified by: Milliken Chemical, Division of Milliken & Co.'s Millad 3988 clarifying agent or Mitsui Toatsu Chemicals, Inc.'s NC4 clarifying agent. Other clarifiers such as sorbitol and benzoates can also be used. Such clarifying agents typically comprises 0.1-0.3% by weight of the polypropylene. The middle layer 26 is preferably made of a material comprising at least an ethylene vinyl alcohol copolymer (EVOH). The middle layer 26 of EVOH provides carbon dioxide and oxygen barrier resistance that allows a product to be stored within the bottle 10 for an extended period of time without spoiling. Note that while the middle layer 26 is preferably made of a material comprising EVOH, the middle layer can comprise any appropriate barrier material, such as nylon or a blend of ethylene vinyl alcohol copolymer and nylon as well without departing from the present invention. An appropriate nylon is exemplified by MXD6, nylon 6 and nylon 6/66. An appropriate adhesive (discussed in detail below) is chosen dependant upon the material of the middle layer 26 to bond the inner and outer layers 24, 28 thereto.
  • The inner and outer layers [0022] 24, 28 are the structural layers of the bottle and provide additional moisture barrier protection for the product to be contained in the bottle 10. The thickness of the inner and outer layers 24, 28 and the thickness of the middle layer 26 are determined by factors such as the type of product to be filled in the container, the desired shelf life of the product, etc. Typically the thickness of the layers are in the range of between approximately 5 mils to 10 mils for each of the inner and outer layers 24, 28 and between approximately 0.1 mils to 2.0 mils for the middle layer 26.
  • The bottle [0023] 10 can be stretch blow molded from a preform 30 (FIG. 3), by using conventional stretch blow molding techniques. In one embodiment, the preform 30 is made by an injection molding process such as the injection molding processes described in U.S. Pat. Nos. 4,511,528 and 4,712,990, which are hereby incorporated by reference. Alternatively, the bottle may be made by extrusion blow molding techniques such as the process described in U.S. Pat. No. 5,156,857, which is hereby incorporated by reference.
  • With regard to injection molding applications, the process temperatures of polypropylene and EVOH are approximately the same. Therefore, the process temperatures of the materials to comprise the inner and outer layers [0024] 24, 28 and the materials to comprise the middle layer 26 are also approximately the same despite the addition of an adhesive (discussed in detail below) to at least one of the inner and outer layers 24, 28 and the middle layer 26. Accordingly, it is easier to maintain proper flow temperatures for the material forming each layer 24, 26, 28 and, therefore, control the flows of these layers having only two different materials as opposed to controlling five layers of three distinct materials (i.e., polypropylene, adhesive and EVOH) which may have different process temperatures. The process temperature of the polypropylene and EVOH is approximately between 180°-235° C. (with or without the adhesive discussed in detail below). It is specifically contemplated, however, that the present invention may be accomplished with material other than the preferred polypropylene and EVOH.
  • In order to bond each of the inner and outer layers [0025] 24, 28 to the middle layer 26, the material of at least one of the inner and outer layers 24, 28 and the middle layer 26 comprises an adhesive mixed therein. Thus, in a first embodiment of the present invention, the inner and outer layers 24, 28 may comprise a mixture of polypropylene and an adhesive (“polypropylene/adhesive mixture”) while the middle layer 26 is comprised of EVOH without an added adhesive. Examples of this first embodiment are provided below.
  • In a second embodiment, the middle layer [0026] 26 may be made of a material comprised of EVOH and an adhesive (“EVOH/adhesive mixture”) while the inner and outer layers 24, 28 are comprised of a polypropylene without an added adhesive. Examples of this second embodiment are provided below.
  • In a third embodiment, the inner and outer layers [0027] 24, 28 are made of the polypropylene/adhesive mixture and the middle layer is made of the EVOH/adhesive mixture.
  • Sufficient adhesion for purposes of this invention means achieving a bond between the middle layer [0028] 26 and each of the inner and outer layers 24, 28 to prevent delamination during forming of the bottle 10 or other container and withstanding normal package handling and distribution. For some applications, sufficient adhesion would also mean a sufficient bond between the layers to withstand hot filling of the container at temperatures of 190°-210° F. The amount of adhesive used must also provide sufficient adhesion for purposes of injection molding the preform and stretch blow molding the container from the preform. Importantly, using the lowest possible percentage of adhesive is desirable because the adhesive is relatively expensive compared to polypropylene and EVOH.
  • It has been found that the greater the percentage of adhesive evenly distributed within any layer of the bottle [0029] 10 (referred to herein as a “mixed-adhesive layer”), the better that layer will adhere to an adjacent layer. This correlation is due to two facts. First, the adhesive force that a mixed-adhesive layer may exert on an adjacent layer of a container depends, at least in part, upon the amount of adhesive available at the outer surface of that mixed-adhesive layer. Second, as the percentage of adhesive agent evenly mixed and distributed throughout any composite material used to construct a mixed-adhesive layer is increased, the amount of adhesive agent which will be exposed at an outer surface of that mixed-adhesive layer (and thereby made available for adhesion to an adjacent layer) will also necessarily increase. Additionally, the percentage of the adhesive agent in the mixed-adhesive layer, which is exposed at the outer surface of that mixed-adhesive layer, is inversely proportional to the thickness of that mixed-adhesive layer. That is, a thinner mixed-adhesive layer will produce greater adhesive potential from a given quantity of adhesive agent, than will a relatively thicker mixed-adhesive layer comprised of the same given quantity of adhesive agent.
  • From the foregoing it will be understood that because the middle layer [0030] 26 of the present invention is thinner (preferably between 0.1 and 2.0 mils) than each of the outer layers 24, 28 (preferably between 5 mils and 10 mils), mixing an adhesive into the middle layer 26, as in the second preferred embodiment of the present invention, will necessarily decrease the amount of adhesive necessary to bond the inner and outer layers 24, 28 to the middle layer 26 relative to the first embodiment of the present invention in which the adhesive is dispersed within the inner and outer layers 24, 28. Moreover, because the second embodiment of the present invention only requires adhesive to be mixed into a single layer rather than into two layers (as required by the first embodiment of the present invention described above), the total quantity of adhesive required for the second embodiment is further reduced relative to the quantity of adhesive required for the first embodiment. Regardless of which embodiment of the present invention is employed, however, the amount of adhesive required to acquire the requisite bonding of the middle layer 26 to both the inner and outer layers 24, 28 is reduced relative to prior methods of bonding polypropylene to EVOH which place an entire layer of adhesive between each of the inner and outer layers 24, 28 and the middle layer 26. Moreover, as discussed above, the complexity of molding preforms to achieve such bonding is likewise reduced by elimination of the adhesive layers.
  • In one embodiment of the present invention, bottles are made having a haze value of less than approximately 29%. In another embodiment, the bottles have a haze value of 10-12%. A haze value is defined as the percent of total light which, in passing through the specimen, deviates through forward scatter by more than 0.044 rad (2.5°) on the average. The preferred test to obtain the haze value of the bottle is ASTM Method D-1003 as defined in the 1995 Annual Book of ASTM Standards, Volume 8.01. [0031]
  • First Embodiment
  • The adhesive used to make the polypropylene/adhesive mixture for the first embodiment of the present invention is a maleic anhydride modified polypropylene. The amount of adhesive that must be blended into the polypropylene depends on the maleic anhydride concentration of the adhesive. Enough adhesive must be added such that the resulting polypropylene/adhesive mixture has a maleic anhydride content of approximately 0.01%-0.20% by weight of the total mixture. (For example: 10% of adhesive containing 0.15% maleic anhydride.) The polypropylene/adhesive mixture can contain between 0-98% by weight polypropylene and between 2-100% by weight adhesive. It has been found that the greater the percentage of adhesive used, the better the layer of EVOH will adhere to the structural layer. However, it has been found that sufficient adhesion between the layers is achieved using polypropylene/adhesive mixtures containing as low as approximately 0.01%-0.015% maleic anhydride. The middle layer [0032] 26, as provided by the prescripts of first embodiment, is comprised of EVOH without the presence of an adhesive therein.
  • The following are examples of the first embodiment of the present invention: [0033]
  • EXAMPLE 1
  • A three-layer coinjection molded preform was made having inner and outer structural layers [0034] 24 and 28 which are made from a polypropylene/adhesive mixture containing about 85% polypropylene and 15% adhesive and a middle layer 26 of EVOH. The polypropylene was Solvay 4285. The adhesive was Morton EFM-2E02. The EVOH selected for the middle layer 26 was Evalca LCE-105A (having a 44% ethylene content). The preform was then stretch blow molded to form a transparent container having a haze value of approximately 10-12% measured through a section of the bottle having a thickness of approximately 15-20 mils.
  • EXAMPLE 2
  • A multilayer coinjection molded preform was made as in Example 1 except that the percentages of polypropylene and adhesive in the inner and outer layers [0035] 24 and 28 were 90% polypropylene and 10% adhesive. The preform was stretch blow molded to form a transparent container having a haze value of approximately between 10-12% measured through a section of the container having a thickness of approximately 15-20 mils.
  • EXAMPLE 3
  • A three-layer container was made by a coextrusion blow molding process. The layers were extruded together to form a tube. The tube was blow molded in a mold to form the container. The layers [0036] 24 and 28 were made from a polypropylene/adhesive mixture containing about 90% polypropylene and 10% adhesive. The polypropylene was Montell SR256M. The adhesive is Morton EFM-2E02. The EVOH selected for the middle layer 26 was Evalca LCE105A.
  • EXAMPLE 4
  • A multilayer coinjection molded preform was made as in Example 1 except that the EVOH used was Evalca LCF-104AW (having a 32% ethylene content). The preform was then stretch blow molded to form a transparent container. [0037]
  • EXAMPLE 5
  • A multilayer coinjection molded preform was made as in Example 1 except that the EVOH used was Evalca LCL 101A (having a 27% ethylene content). The preform was then stretch blow molded to form a transparent container. [0038]
  • EXAMPLE 6
  • A multilayer coinjection molded preform was made as in Example 1 except that the EVOH used was Nippon Gohsei Soamol DC3203. The preform was then stretch blow molded to form a transparent container. [0039]
  • EXAMPLE 7
  • A multilayer coinjection molded preform was made as in Example 1 except that the barrier was nylon, specifically Mitsubishi's MXD6-6121 nylon. The preform was then stretch blow molded to form a transparent container. [0040]
  • EXAMPLE 8
  • A multilayer coinjection molded preform was made as in Example 1 except that the polypropylene was Fina 7426MZ. The preform was then stretch blow molded to form a transparent container. [0041]
  • EXAMPLE 9
  • A multilayer coinjection molded preform was made as in Example 1 except that the polypropylene was Montell SR256M. The preform was then stretch blow molded to form a transparent container. [0042]
  • EXAMPLE 10
  • A multilayer coinjection molded preform was made as in Example 1 except that the polypropylene/adhesive mixture layer was 100% Mitsui Admer QB510A. The preform was then stretch blow molded to form a transparent container. [0043]
  • The bottles made in Examples 1-10 of the first embodiment above are transparent, exhibit good strength and provide excellent carbon dioxide, oxygen and moisture barrier protection. The bottles can also withstand being hot filled. [0044]
  • Second Embodiment
  • The EVOH/adhesive mixture used for the middle layer [0045] 26 of the second embodiment was comprised of Evalca XEP403 resin. The inner and outer layers 24, 28 are comprised of polypropylene without the presence of a maleic anhydride therein.
  • The following are examples of the second embodiment of the present invention: [0046]
  • EXAMPLE 1
  • A three-layer coinjection molded preform was made having inner and outer structural layers [0047] 24 and 28 made from 100% polypropylene. The polypropylene was Solvay 4285. The middle layer 26 was made from 100% Evalca XEP403 resin. The preform was then stretch blow molded to form a transparent container.
  • EXAMPLE 2
  • A multilayer coinjection molded preform was made as in Example [0048] 1 of the second embodiment except that the polypropylene used for the inner and outer structural layers 24 and 28 was Fina 7426MZ and the middle layer 26 was comprised of Evalca XEP403 having 100 ppm of Cobalt. The preform was then stretch blow molded to form a transparent container.
  • The bottles made in Examples 1 and 2 of the second embodiment are transparent, exhibit good strength and provide carbon dioxide, oxygen and moisture barrier protection. [0049]
  • From the foregoing description, it will be apparent that the transparent multilayer polypropylene containers having a barrier layer of the present invention have a number of advantages, some of which have been described above and others of which are inherent in the transparent multilayer polypropylene containers of the present invention. Also, it will be understood that modifications can be made to the transparent multilayer polypropylene containers having a barrier layer of the present invention without departing from the teachings of the invention. Accordingly the scope of the invention is only to be limited as necessitated by the accompanying claims. [0050]

Claims (9)

We claim:
1. A multilayer injection molded container comprising:
a first layer comprising polypropylene; and
a second layer comprising a material selected from the group consisting of EVOH and nylon, directly adjacent to said first layer;
wherein at least one of said first and second layer further comprises an adhesive mixed therein.
2. The container of
claim 1
wherein said first layer contains approximately 0.01% to 0.20% maleic anhydride.
3. The container of
claim 1
wherein said first layer contains approximately 0.015% maleic anhydride.
4. The container of
claim 1
wherein said container has a haze value of less than approximately 29% measured through a section of the bottle having a total thickness of greater than approximately 15 mils.
5. The container of
claim 1
wherein said container has a haze value of approximately 10%-12% measured through a section of the bottle having a total thickness of greater than approximately 15 mils.
6. The container of
claim 1
wherein said second layer comprises EVOH.
7. The container of
claim 1
wherein said second layer comprises MXD6 nylon.
8. The container of
claim 1
wherein said second layer comprises nylon 6.
9. The container of
claim 1
wherein said second layer comprises nylon 6/66.
US09/901,427 1998-04-17 2001-07-09 Transparent multilayer polypropylene container with barrier protection Abandoned US20010038897A1 (en)

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US09/293,401 US6677013B1 (en) 1998-04-17 1999-04-16 Transparent multilayer polypropylene container with barrier protection
US09/901,427 US20010038897A1 (en) 1998-04-17 2001-07-09 Transparent multilayer polypropylene container with barrier protection

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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