CA1141700A - Steam-sterilizable, sealable films - Google Patents

Steam-sterilizable, sealable films

Info

Publication number
CA1141700A
CA1141700A CA000354581A CA354581A CA1141700A CA 1141700 A CA1141700 A CA 1141700A CA 000354581 A CA000354581 A CA 000354581A CA 354581 A CA354581 A CA 354581A CA 1141700 A CA1141700 A CA 1141700A
Authority
CA
Canada
Prior art keywords
film
vinyl acetate
ethylene
layer
films
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
CA000354581A
Other languages
French (fr)
Inventor
Herbert Bartl
Hans-Heribert Burgdorfer
Gunther Lehnert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bayer AG
Original Assignee
Bayer AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bayer AG filed Critical Bayer AG
Application granted granted Critical
Publication of CA1141700A publication Critical patent/CA1141700A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
    • B29C59/16—Surface shaping of articles, e.g. embossing; Apparatus therefor by wave energy or particle radiation, e.g. infrared heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/02—Preparation of the material, in the area to be joined, prior to joining or welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/737—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined
    • B29C66/7375—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined uncured, partially cured or fully cured
    • B29C66/73753—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined uncured, partially cured or fully cured the to-be-joined area of at least one of the parts to be joined being partially cured, i.e. partially cross-linked, partially vulcanized
    • B29C66/73754—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the state of the material of the parts to be joined uncured, partially cured or fully cured the to-be-joined area of at least one of the parts to be joined being partially cured, i.e. partially cross-linked, partially vulcanized the to-be-joined areas of both parts to be joined being partially cured
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7394—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoset
    • B29C66/73941—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoset characterised by the materials of both parts being thermosets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/16—Layered products comprising a layer of synthetic resin specially treated, e.g. irradiated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0008—Electrical discharge treatment, e.g. corona, plasma treatment; wave energy or particle radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • B29C2035/0827—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using UV radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
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    • B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • B29C2035/0844—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using X-ray
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
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    • B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • B29C2035/085—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using gamma-ray
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
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    • B29C35/0866—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using particle radiation
    • B29C2035/0877—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using particle radiation using electron radiation, e.g. beta-rays
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
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    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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    • B29K2105/246—Uncured, e.g. green
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0037—Other properties
    • B29K2995/0068—Permeability to liquids; Adsorption
    • B29K2995/0069—Permeability to liquids; Adsorption non-permeable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2007/00—Flat articles, e.g. films or sheets
    • B29L2007/008—Wide strips, e.g. films, webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7148—Blood bags, medical bags
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2305/00—Condition, form or state of the layers or laminate
    • B32B2305/72—Cured, e.g. vulcanised, cross-linked
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/31—Heat sealable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/412—Transparent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • B32B2307/7246—Water vapor barrier
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2310/00—Treatment by energy or chemical effects
    • B32B2310/08—Treatment by energy or chemical effects by wave energy or particle radiation
    • B32B2310/0875—Treatment by energy or chemical effects by wave energy or particle radiation using particle radiation
    • B32B2310/0881—Treatment by energy or chemical effects by wave energy or particle radiation using particle radiation using ion-radiation, e.g. alpha-rays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2310/00—Treatment by energy or chemical effects
    • B32B2310/08—Treatment by energy or chemical effects by wave energy or particle radiation
    • B32B2310/0875—Treatment by energy or chemical effects by wave energy or particle radiation using particle radiation
    • B32B2310/0887—Treatment by energy or chemical effects by wave energy or particle radiation using particle radiation using electron radiation, e.g. beta-rays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/40—Closed containers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/70—Food packaging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/80—Medical packaging

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Thermal Sciences (AREA)
  • Laminated Bodies (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)

Abstract

STEAM-STERILIZABLE, SEALABLE FILMS

Abstract of the Disclosure A process for the production of steam-steriliz-able and heat-sealable films, wherein a film of a crosslinkable polymer is irradiated on one side with ionising radiation of such an intensity that the film crosslinks over the irradiated surface and remains uncrosslinked on the opposite surface.

Le A 19 628

Description

This invention relates to transparent~ soft, flexible films which can be heat-sealed and sterilized with steam of materials suitable for the packaging of foods and drugs and to a process for the production thereof. The ~ilms 5 according to the present invention also are essentially impermeable to water vapour.
Films, including multilayer films of ethylene/vinyl acetate copolymers, polyethylene and polypropylene, are known. However, they are neither heat-stable nor 10 sufficiently flexible. It is also known that polymers can be crosslinked by high energy radiation and hence rendered infusible. However, this means that they may no longer be sealed. Attempts have also been made to coat crosslinked and hence sterilization-resistant 15 ethylene/vinyl acetate copolymers with a thermoplast as ~ealing layer. However, the thus applied layer has a tendency towards delamination.
It has now been found that steam-sterilizable and heat-sealable films can be obtained by irradiating one 20 side of a film of a crosslinkable polymer with ionising radiation of such intensity that the film crosslinks on the irradiated surface, but remains essentially uncross-linked on the opposite surface. The ionising radiation used is preferably a high energy electron beam because 25 the dosage of such radiation is easily controlled. ~y virtue of the crosslinked layer such films can be steam-sterilized.
However, they also remain heat-sealable by virtue of the uncrosslinked surfac~.
According to the present invention, it is preferred to irradiate multilayer Pilms consisting of a plurality of layers of polymers differeing from one another in their crosslinkability. At least two layers have to be present. In this way, the more readily crosslinkable 35 polymer crosslinks througho~t, and the other crosslink-able polymer remains substantially uncrosslinked- r' Le A 19 628 70(~

The other layer respectively remains so poor:Ly crosslinked that it is still capable of being molten and thus can be heat-sealed.
Films of a uniform polymer which can be used in accordance with the present invention are, in particular, films of copolymers of olefins (such as ethylene and/or propylene) with polar vinyl monomers such as vinyl esters, for example, vinyl acetate or acrylates or unsaturated carboxylic acids, for example, acrylic acid and methacrylic acid. The minimum polar vinyl monomer content is 8% by weight. The films may also contain further monomers in copoly-merized form, for example, unsaturated carboxylic acids, such as acrylic acid and methacrylic acid, or carbon monoxide. Particularly favourable films are films of ethylene/vinyl acetate/acrylate terpolymers containing from 20 to 50%
by weight of copolymerized acrylate, particularly, ethyl acrylate, butyl acrylate or t-butyl acrylate, and films of ethylene/vinyl acetate copolymers containing from 20 to 50% by weight of vinyl acetate. Such films can be crosslinked with a particularly small radiation dose and are particularly flex-ible in crosslinked form.
Where multilayer films are used, one layer preferably consists of the above described copolymers and the other layer of polyolefins, for example, polyethylene, polypropylene or ethylene/propylene copolymers. These polyolefins are fairly difficult to crosslink; the crosslinking thereof requires a radiation dose which is at least two megarads higher than that required for the first mentioned films. Most preferred are composite films of ethylene/vinyl acetate copolymer as one layer and polypropylene as the second layer.
Films partially crosslinked in layers by irradiation can aiso be produced from thermoplastic monofilms. Wnile in cases where y-rays or highly accelerated electrons are used for irradiation, the crosslinking sites of the polymer material are, generally, uniformly distributed over the cross-section of the film, it is possible in the 17~) case o~ ~-irradiation to control the reaction by varying the acceleration voltage in such a way that only a certain layer thickness from the surface is crosslinked. Accord-ing to the present invention, the electron voltage and radiation dose are selected in such a way that one layer of the film is adequately crosslinked, whilst the remote layer remains essentially uncrosslinked and, therefore, sealable. Ethylene/vinyl acetate films are particularly suitable, being irradiated with electrons of from 150 to 400 kV and from 2 to 12 megarads, preferably 320 k~ and 6 megarads, for a thickness of 200 /u, for example.
Suitable ionising beams are accelerated electron beams and also short-wave electromagnetic beams, such as UV, ~- or X-rays.
Multilayer films are produced, for example, by co-extruding an ethylene/vinyl ester copolymer and a poly-olefin. The thus obtained films are preferably irr~diated with high energy electron beams, the dosage being gauged in such a way that the layer of ethylen~/vinyl ester co polymer is crosslinked, whilst the layer of polyole~in is minimally crosslinked, if at all.
It is particularly preferred to use polymer combina-tions in the extruded films of which irradiation doses of from Z to 10 meg~rads are sufficient. A combination of ethylene/vinyl acetate copolymers having a vinyl acetate content of from 20 to 50 % with polyethylene or poly-propylene is particularly favourable. In this case, an irradiation dose of from 2 to 12 megarads is required.
By combining different polymers in the composite films, it is also possible to obtain additional desir-able effects. For example, the use of polyethylene or polypropylene as the sealable layer results in a reduc-tion in permeability to water vapour, whilst a film of hydrolysed ethylene/vinyl acetate copolymer of high Le A 19 628 7~0 acetate content has an e~cellent oxygen-inhibiting effect.
Where the films are used as blood bags, the inner layers of the bags may also be coated with aggregation-inhibiting substances or consist of such a (film)material. Composite films may be produced by conventional methods, i.e., not only by co-extrusion but also by lamination or subsequent bonding of the already produced films or by coating.
However, co-extrusion is preferred.
Co-extruded films are suitable for packaging of food and medicaments because they may be produced from physio-logically acceptable polymers and do not require adhesives or laminating agents.
Medicaments are, e.g., infusion solutions, injection materials, and blood substitute.

Le A 19 628

Claims (9)

CLAIMS:
1. A process for the production of steam-sterilizable and heat-sealable films, wherein one side of a film of a crosslinkable polymer is irradiated with ionising radia-tion of such an intensity that the film crosslinks on the irradiated surface and on the opposite surface to a great-extent remains uncrosslinked.
2. A process as claimed in Claim 1, wherein multilayer films consisting of a plurality of layers of polymers differing in crosslinkability are irradiated.
3. A process as claimed in Claim 1, wherein high energy electron radiation is used as the ionising radiation.
4. A process as claimed in Claim 2, wherein the multi-layer film consists of an ethylene/vinyl acetate or of an ethylene/vinylacetate and/or acrylate copolymer layer (containing from 20 to 50 % by weight of vinyl acetate respectively acrylate) and of a polyethylene layer.
5. A process as claimed in Claim 2, wherein the multi-layer film consists of an ethylene/vinyl acetate or of an ethylene/vinyl acetate and/or acrylate copolymer layer (containing from 20 to 50 % by weight of vinyl acetate respectively acrylate) and of a polypropylene layer.
6. A process as claimed in Claim 2, wherein the composite film consists of a hydrolysed and a non-hydrolysed ethylene/vinyl acetate copolymer film and, optionally, of a polyethylene or polypropylene film.
7. A crosslinked polymer film made by the process accord-ing to Claim 1.
8. A crosslinked steam-sterilizable and heat-sealable polymer film consisting of an irradiated multilayer film according to claim 2.
9. A sealed container made from a film produced in accordance with Claim 1.
Le A 19 628
CA000354581A 1979-06-22 1980-06-23 Steam-sterilizable, sealable films Expired CA1141700A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP2925205.9 1979-06-22
DE19792925205 DE2925205A1 (en) 1979-06-22 1979-06-22 STEAM-STEELABLE, SEALABLE FILMS

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CA1141700A true CA1141700A (en) 1983-02-22

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EP (1) EP0022184A1 (en)
JP (1) JPS565834A (en)
AU (1) AU5913680A (en)
CA (1) CA1141700A (en)
DE (1) DE2925205A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6051292A (en) * 1993-01-29 2000-04-18 American National Can Company Heat shrinkable film structures with improved sealability and toughness

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5882752A (en) * 1981-11-11 1983-05-18 呉羽化学工業株式会社 Heat-shrinkable film
EP0120052A4 (en) * 1982-09-27 1985-03-08 Du Pont Coextruded elastomeric films.
US4501780A (en) * 1982-12-15 1985-02-26 W. R. Grace & Co., Cryovac Div. Tubular film having sealing layer of propylene ethylene random copolymer
EP0120672B1 (en) * 1983-03-23 1989-03-08 Toa Nenryo Kogyo Kabushiki Kaisha Oriented polyethylene film and method of manufacture
GB8332952D0 (en) * 1983-12-09 1984-01-18 Ward I M Polymer irradiation
US4631155A (en) * 1985-02-01 1986-12-23 American Hoechst Corporation Process for manufacture of surface-modified oriented polymeric film
US4863768A (en) * 1986-06-19 1989-09-05 Asahi Kasei Kogyo Kabushiki Kaisha Heat shrinkable cylindrical laminated film
US5075156A (en) * 1988-03-15 1991-12-24 Asahi Kasei Kogyo Kabushiki Kaisha Multi-layered crosslinked ethylenic resin film, a process for production thereof and a method of applying said film
EP0358445A3 (en) * 1988-09-07 1990-11-14 Tonen Sekiyukagaku K.K. Polyethylene composite film and label
JPH02134246A (en) * 1988-11-15 1990-05-23 Tonen Sekiyukagaku Kk Heat-sealable polyethylene crosslinked stretched film and production thereof
DE69311497T2 (en) * 1992-10-26 1997-11-06 Mitsui Petrochemical Ind Compressible tubular container and method for its manufacture
JP3442812B2 (en) * 1993-04-14 2003-09-02 三井化学株式会社 Polyethylene reforming container
US20180345633A1 (en) * 2015-10-29 2018-12-06 Dai Nippon Printing Co., Ltd. Polyethylene film, laminate and package using the same
JP6846000B2 (en) * 2015-10-29 2021-03-24 大日本印刷株式会社 Polyethylene film and packaging using it

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Publication number Priority date Publication date Assignee Title
BE756521A (en) * 1969-10-02 1971-03-23 Ici Ltd HOT WELDABLE FILMS
ES448091A1 (en) * 1975-05-22 1977-07-01 Grace W R & Co Film laminates having a reirradiated layer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6051292A (en) * 1993-01-29 2000-04-18 American National Can Company Heat shrinkable film structures with improved sealability and toughness
EP0613772B2 (en) † 1993-01-29 2008-07-09 American National Can Company Tough heat-shrinkable multilayer film

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JPS565834A (en) 1981-01-21
AU5913680A (en) 1981-01-08
EP0022184A1 (en) 1981-01-14
DE2925205A1 (en) 1981-02-05

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