CA2122288A1 - Deep-drawable, sealable, multi-layer recycled film based on polyamide and polyolefins with a high content of recycled material - Google Patents
Deep-drawable, sealable, multi-layer recycled film based on polyamide and polyolefins with a high content of recycled materialInfo
- Publication number
- CA2122288A1 CA2122288A1 CA002122288A CA2122288A CA2122288A1 CA 2122288 A1 CA2122288 A1 CA 2122288A1 CA 002122288 A CA002122288 A CA 002122288A CA 2122288 A CA2122288 A CA 2122288A CA 2122288 A1 CA2122288 A1 CA 2122288A1
- Authority
- CA
- Canada
- Prior art keywords
- film
- layer
- polyamide
- recycled
- scrap
- 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.)
- Abandoned
Links
Classifications
-
- 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
- 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
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2270/00—Resin or rubber layer containing a blend of at least two different polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2305/00—Condition, form or state of the layers or laminate
- B32B2305/70—Scrap or recycled material
-
- 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
- B32B2307/718—Weight, e.g. weight per square meter
-
- 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
- B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
- B32B2309/08—Dimensions, e.g. volume
- B32B2309/10—Dimensions, e.g. volume linear, e.g. length, distance, width
- B32B2309/105—Thickness
-
- 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
Landscapes
- Laminated Bodies (AREA)
- Containers Having Bodies Formed In One Piece (AREA)
- Wrappers (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
Abstract
A deep-drawable, sealable, multi-layer recycled film based on polyamide and polyolefins with a high content of recycled material Abstract The invention relates to a multi-layer sealable recycled film comprising at least one layer of scrap and one sealing layer, wherein - the film is deep-drawable, - the scrap layer comprises recycled polyamide/
polyolefin and a primer, the proportion of recycled material in the scrap layer being 60 to 98% by weight, - the recycled material has a polyamide content of 3 to 45% by weight and - the sealing layer has one or more layers and consists of polyolefinic polymer or copolymer, the layers optionally being the same or different.
polyolefin and a primer, the proportion of recycled material in the scrap layer being 60 to 98% by weight, - the recycled material has a polyamide content of 3 to 45% by weight and - the sealing layer has one or more layers and consists of polyolefinic polymer or copolymer, the layers optionally being the same or different.
Description
~ 2122288 i . .
...,~ _....~
The invention relates to recycled film based on polyamide and polyolefin waste occurring e.g. in the production of laminated filmæ. The invention relates to use of waste material occurring in the manufacturing proce,s and i8 therefore of high ecological and economic importance. The deep-drawable film is usable on modern deep-drawing ~ automatic machines for packaging induqtrial medical ;~ equipment, semi-finished product~, and finished parts and for packaging of food. The film produced according to the 15 invention can be completely recycled. -In the prior art, there are various known composite film structures containing scrap material based on polyamide and polyolefins. The term "scrap material" here means waste - ~-~
20 film occurring e.g. in the production of laminated film, -~
; e.g. edge trimmings, starting rolls or cutting waste, which ~
is subsequently agglomerated and optionally regranulated. ~ ~ -Most films made from scrap material are single-layer films (e.g. JE' 04-1119809 or JE 03-237143), and will not be -~
25 further considered here -~ : --In the multilayer film sector, incorporation of scrap material originated from the fact that edge trimmings, which inevitably occur in the production process, were returned to the process whenever possible. This is called "recycling of edge trimmings". The aim is to incorporate the scrap material substantially without affecting the properties of the film (e.g. mechanical and optical properties or transparency). The result is that only small quantities of scrap material can be incorporated in this manner. The scrap material is either added in small quantities to a layer - usually internal - of the fil5m, or forms a single layer between existing layers. Layers of ~W 5383 - Foreign countries 21~8~
polyamide and polyolefin scrap are morphologically unhomogeneous and cannot be deep-drawn by themselves in the prior art. As a result of the incompatibility of the phases formed, micro-cracks occur even when not under tension, and result in premature fracture under tensile loads (Braun, D.: Chemische Prozesse bei der Herstellung und Verarbeitung von Polymerblends: lD. Braun: "Chemical processes during the manufacture and proceqqing of polymer blend"] in "Aufbereiten von Polymerblends, VDI Verlag, Dusseldorf (1989), pages 129 ff).
AU 88-26-473-A discloses a laminate containing an -intermediate layer which can comprise scrap material originating from the same film (e.g. edge trimmings). In 15 this case, obviously, the total composite material can be -made heat-deformable only if the unhomogeneous, easily-torn scrap layer is supported on both sides. Machinery for encapsulating scrap layers i9 described in GB 2075-914.
US-PS 4 668 571 describes a three-layer structure having an -internal layer which can incorporate scrap material from the same film. To obtain the desired properties in this case, pure materia} from the adjacent layers must be mixed with the scrap layer.
~5 -US-PS 4 647 509 describes a polystyrene-containing multilayer structure having a first and a second layer designed so that scrap material from the two layers can be recycled by returning to the second layer.
All these films have the disadvantage that only scrap material originating from the ~ame film can be returned thereto, and no foreign material can be incorporated in the scrap. Hitherto there has been no success in obtaining a composite film comprising a scrap layer with only one adjacent supporting layer and containing over 50% by weight of recycled material relative to the entire film and deep-drawable.
The problem therefore is to produce a multilayer film which is deep-drawable and ~ealable and contains large quantities of recycled material based on polyamide and polyolefins.
To this end, the recycled material can contain any unsorted polyamide/polyolefin waste film, e.g. produced during the manufacture of polyamide/polyolefin films. The film structure according to the invention, therefore, in addition to being completely recyclable, must therefore include a scrap layer capable of incorporating waste film from other polyamide-polyolefin film structures.
The film must be deep-drawable and sealable and -consequently of use in modern deep-drawing automatic machines, either as a cover film or a blister film for packaging. The film therefore must also have good ; 20 lubricating properties.
:.:
The film must have an optically homogeneous appearance, ~ -both in the deep-drawn state and in the state before shaping.
~25 Surprisingly this has been achieved by means of a Realable, ~ -multi-layer recycled film compriæing at least one scrap ~
layer and a sealing layer, characterised in that ~ -30 - the film is deep-drawable, - the scrap layer consists of recycled polyamide/
polyolefin and a [primer], the proportion of recycled material in the scrap layer being 60 to 98% by weight and the proportion of primer being 2 to 40% by weight, 21~2~88 - the recycled material has a polyamide content of 3 to 45% by weight and - the sealing layer has one or more layers and consists of polyolefinic polymer or copolymer, the layers optionally being the same or different.
The polyamide/polyolefin recycled material can be regenerated (granulated with admixtures after remelting), or regranulated (granulated without admixtures after remelting) or a~glomerated (without admixtures), prepared from waste film. The proportion of polyamide in the recycled material is 3 to 45% by weight. The polyamide is either an aliphatic polyamide such as PA 6, PA 11, PA 12, PA 66, PA 6.66, PA 6.8, PA 6.9, PA 6.10, PA 6.11 or PA 6.12, or a copolymer of the monomer units therein or a mixture of the aforementioned aliphatic polyamides. The polyolefinic component consists of polymers such as high-density, medium-density, low-density or linear low-density polyethylene, polypropylene or polypropylene copolymers, e~hylene/vinyl acetate copolymers, ethylene/vinyl alcohol copolymers, ethylene acrylic acetate copolymers, ethylene/methylacrylic acetate copolymers, ionomers or adhesive residues from laminated composite films.
The primer is an anhydride-modified polyolefin or an anhydride-modified ethylene/vinyl acetate copolymer.
Preferably it is an ethylene, propylene or ethylene/vinyl acetate based primer grafted with maleic acid anhydride.
The sealing layer is made of conventional sealing material.
This can be a polyethylene, polypropylene, polypropylene copolymer, ethylene/vinyl acetate copolymer, ethylene acrylic acid copolymer, ethylene/methylene acrylic acid copolymer or ionomer, or a blend of the aforementioned polymers.
. ' , , " ' ' ' ' ' ` .
`` 2122288 .
Optionally the invention can contain an intermediate layer consisting of polyamide or polyolefin or having the structure polyamide/EVOH-polyamide, or a mixture of polyamide and polyolefin enriched with primer. Optionally 5 also, a covering layer can be provided on the side remote -from the sealing layer, using the same material~ as for the intermediate layer. In both cases, aæ before, the film can be made by adhesive lamination and/or co-extrusion.
Since both layers are unnecessary for giving deep-drawing properties to the film, the intermediate and covering layer can be used to vary the properties of the film (e.g. the appearance and barrier properties). More particularly, use can be made of polyamide (to obtain a brilliant appearance and excellent mechanical strength), polyolefin (to obtain excellent barriers against water-vapour), a mixture of polyamide and polyolefin enriched with primer (to obtain variable adjustable properties) or a polyamide/
EVOH/polyamide structure (excellent oxygen barrier). ~ -Surprisingly, as a result of the structure of the film according to the invention, the special requirements regarding deep-drawing and sealing have been met. It could not be expected that a mixture of incompatible polymers, processed in a layer with small quantities of primer and with only one adjacent support layer, could be deep-drawn in a multilayer composite structure. It is also surprising that the scrap layer can contain recycled material based on polyamide and polyolefins but not originating from the same film. Unexpectedly, the optical appearance of the film is homogeneous and comparable in both the original and in the deep-drawn state.
, .
Advantageously the claimed film is produced by co-extrusion. If co-extrusion is impossible, the individual layers are manufactured singly and subsequently joined by ~-~.
- ` 212~88 adhesive lamination. A combination of the processes i8 also possible. Known machinery conventional in the prior art can be used.
An important feature for evaluating the invention is the deep-drawing capacity. In order to determine the deep-drawing capacity, previously-manufactured film samples were tested on modern automatic deep-drawing machines ~e.g.
Tiromat or Multivac) used in the packaging industry. To this end, webs of films tensioned in the machine were heated in portions over a heating plate. The heat can be applied either from the sealing side or from the side remote therefrom. After being preheated by plates at temperatures of 100 - 110C, the films were drawn by negative pressure into a cavity having the frame dimensions 185 x 115 mm. The depth of the cavity was varied between 20 and 70 mm.
The result of deep drawing was marked as follows:
1. Unsatisfactory - every attempt to form a cavity results in tears in the film:
Marked "--"
...,~ _....~
The invention relates to recycled film based on polyamide and polyolefin waste occurring e.g. in the production of laminated filmæ. The invention relates to use of waste material occurring in the manufacturing proce,s and i8 therefore of high ecological and economic importance. The deep-drawable film is usable on modern deep-drawing ~ automatic machines for packaging induqtrial medical ;~ equipment, semi-finished product~, and finished parts and for packaging of food. The film produced according to the 15 invention can be completely recycled. -In the prior art, there are various known composite film structures containing scrap material based on polyamide and polyolefins. The term "scrap material" here means waste - ~-~
20 film occurring e.g. in the production of laminated film, -~
; e.g. edge trimmings, starting rolls or cutting waste, which ~
is subsequently agglomerated and optionally regranulated. ~ ~ -Most films made from scrap material are single-layer films (e.g. JE' 04-1119809 or JE 03-237143), and will not be -~
25 further considered here -~ : --In the multilayer film sector, incorporation of scrap material originated from the fact that edge trimmings, which inevitably occur in the production process, were returned to the process whenever possible. This is called "recycling of edge trimmings". The aim is to incorporate the scrap material substantially without affecting the properties of the film (e.g. mechanical and optical properties or transparency). The result is that only small quantities of scrap material can be incorporated in this manner. The scrap material is either added in small quantities to a layer - usually internal - of the fil5m, or forms a single layer between existing layers. Layers of ~W 5383 - Foreign countries 21~8~
polyamide and polyolefin scrap are morphologically unhomogeneous and cannot be deep-drawn by themselves in the prior art. As a result of the incompatibility of the phases formed, micro-cracks occur even when not under tension, and result in premature fracture under tensile loads (Braun, D.: Chemische Prozesse bei der Herstellung und Verarbeitung von Polymerblends: lD. Braun: "Chemical processes during the manufacture and proceqqing of polymer blend"] in "Aufbereiten von Polymerblends, VDI Verlag, Dusseldorf (1989), pages 129 ff).
AU 88-26-473-A discloses a laminate containing an -intermediate layer which can comprise scrap material originating from the same film (e.g. edge trimmings). In 15 this case, obviously, the total composite material can be -made heat-deformable only if the unhomogeneous, easily-torn scrap layer is supported on both sides. Machinery for encapsulating scrap layers i9 described in GB 2075-914.
US-PS 4 668 571 describes a three-layer structure having an -internal layer which can incorporate scrap material from the same film. To obtain the desired properties in this case, pure materia} from the adjacent layers must be mixed with the scrap layer.
~5 -US-PS 4 647 509 describes a polystyrene-containing multilayer structure having a first and a second layer designed so that scrap material from the two layers can be recycled by returning to the second layer.
All these films have the disadvantage that only scrap material originating from the ~ame film can be returned thereto, and no foreign material can be incorporated in the scrap. Hitherto there has been no success in obtaining a composite film comprising a scrap layer with only one adjacent supporting layer and containing over 50% by weight of recycled material relative to the entire film and deep-drawable.
The problem therefore is to produce a multilayer film which is deep-drawable and ~ealable and contains large quantities of recycled material based on polyamide and polyolefins.
To this end, the recycled material can contain any unsorted polyamide/polyolefin waste film, e.g. produced during the manufacture of polyamide/polyolefin films. The film structure according to the invention, therefore, in addition to being completely recyclable, must therefore include a scrap layer capable of incorporating waste film from other polyamide-polyolefin film structures.
The film must be deep-drawable and sealable and -consequently of use in modern deep-drawing automatic machines, either as a cover film or a blister film for packaging. The film therefore must also have good ; 20 lubricating properties.
:.:
The film must have an optically homogeneous appearance, ~ -both in the deep-drawn state and in the state before shaping.
~25 Surprisingly this has been achieved by means of a Realable, ~ -multi-layer recycled film compriæing at least one scrap ~
layer and a sealing layer, characterised in that ~ -30 - the film is deep-drawable, - the scrap layer consists of recycled polyamide/
polyolefin and a [primer], the proportion of recycled material in the scrap layer being 60 to 98% by weight and the proportion of primer being 2 to 40% by weight, 21~2~88 - the recycled material has a polyamide content of 3 to 45% by weight and - the sealing layer has one or more layers and consists of polyolefinic polymer or copolymer, the layers optionally being the same or different.
The polyamide/polyolefin recycled material can be regenerated (granulated with admixtures after remelting), or regranulated (granulated without admixtures after remelting) or a~glomerated (without admixtures), prepared from waste film. The proportion of polyamide in the recycled material is 3 to 45% by weight. The polyamide is either an aliphatic polyamide such as PA 6, PA 11, PA 12, PA 66, PA 6.66, PA 6.8, PA 6.9, PA 6.10, PA 6.11 or PA 6.12, or a copolymer of the monomer units therein or a mixture of the aforementioned aliphatic polyamides. The polyolefinic component consists of polymers such as high-density, medium-density, low-density or linear low-density polyethylene, polypropylene or polypropylene copolymers, e~hylene/vinyl acetate copolymers, ethylene/vinyl alcohol copolymers, ethylene acrylic acetate copolymers, ethylene/methylacrylic acetate copolymers, ionomers or adhesive residues from laminated composite films.
The primer is an anhydride-modified polyolefin or an anhydride-modified ethylene/vinyl acetate copolymer.
Preferably it is an ethylene, propylene or ethylene/vinyl acetate based primer grafted with maleic acid anhydride.
The sealing layer is made of conventional sealing material.
This can be a polyethylene, polypropylene, polypropylene copolymer, ethylene/vinyl acetate copolymer, ethylene acrylic acid copolymer, ethylene/methylene acrylic acid copolymer or ionomer, or a blend of the aforementioned polymers.
. ' , , " ' ' ' ' ' ` .
`` 2122288 .
Optionally the invention can contain an intermediate layer consisting of polyamide or polyolefin or having the structure polyamide/EVOH-polyamide, or a mixture of polyamide and polyolefin enriched with primer. Optionally 5 also, a covering layer can be provided on the side remote -from the sealing layer, using the same material~ as for the intermediate layer. In both cases, aæ before, the film can be made by adhesive lamination and/or co-extrusion.
Since both layers are unnecessary for giving deep-drawing properties to the film, the intermediate and covering layer can be used to vary the properties of the film (e.g. the appearance and barrier properties). More particularly, use can be made of polyamide (to obtain a brilliant appearance and excellent mechanical strength), polyolefin (to obtain excellent barriers against water-vapour), a mixture of polyamide and polyolefin enriched with primer (to obtain variable adjustable properties) or a polyamide/
EVOH/polyamide structure (excellent oxygen barrier). ~ -Surprisingly, as a result of the structure of the film according to the invention, the special requirements regarding deep-drawing and sealing have been met. It could not be expected that a mixture of incompatible polymers, processed in a layer with small quantities of primer and with only one adjacent support layer, could be deep-drawn in a multilayer composite structure. It is also surprising that the scrap layer can contain recycled material based on polyamide and polyolefins but not originating from the same film. Unexpectedly, the optical appearance of the film is homogeneous and comparable in both the original and in the deep-drawn state.
, .
Advantageously the claimed film is produced by co-extrusion. If co-extrusion is impossible, the individual layers are manufactured singly and subsequently joined by ~-~.
- ` 212~88 adhesive lamination. A combination of the processes i8 also possible. Known machinery conventional in the prior art can be used.
An important feature for evaluating the invention is the deep-drawing capacity. In order to determine the deep-drawing capacity, previously-manufactured film samples were tested on modern automatic deep-drawing machines ~e.g.
Tiromat or Multivac) used in the packaging industry. To this end, webs of films tensioned in the machine were heated in portions over a heating plate. The heat can be applied either from the sealing side or from the side remote therefrom. After being preheated by plates at temperatures of 100 - 110C, the films were drawn by negative pressure into a cavity having the frame dimensions 185 x 115 mm. The depth of the cavity was varied between 20 and 70 mm.
The result of deep drawing was marked as follows:
1. Unsatisfactory - every attempt to form a cavity results in tears in the film:
Marked "--"
2. Defective - an unacceptable number of attempts to form a cavity result in cracks in the film:
Marked "-"
Marked "-"
3. Good - no cracks occur and the shape of the cavity is good:
Marked "+"
The elongation at tear to DIN 53 455 was determined at the same time as the deep-drawing capacity was experimentally - 21 222~8 ,. ", , ~.
evaluated. The "elongation at tear" means the alteration in length of the te~t-piece in mm at the tearing force, relative to the original measured length in mm (see definition in DIN 53 455). To this end, tensile tests were made to the aforementioned DIN. Test-pieces 15 mm wide were investigated at 23C and 50% relative air humidity.
The test speed was 100 mm/min.
The invention will be illustrated with reference to the 10 following examples: -A. Exam~le 1: -Two-layer film having the structure: -Scrap / ~va 120 / 50 ,um The film was made by co-extrusion. The scrap layer contained 20% by weight of primer and 80% by weight of recycled material. The primer was an LLDPE-based polymer grafted with maleic acid anhydride. The proportion of ~ 25 polyamide in the recycled material was 33% by weight. EVA
i is an ethylene/vinyl acetate copolymer containing 5% by weight of vinyl acetate.
B. Exa~elQ Zl Two-layer film having the structure:
8crap / PE
70 / 70 ,um -~ , ` 2122~
The film was made by adhesive lamination, the scrap layer and the PE layer first being extruded in the form of a single-layer film. The scrap layer contained 15% by weight of primer and 85% by weight of recycled material. The primer was an LLDPE-based polymer grafted with maleic acid anhydride. The proportion of polyamide in the recycled material was 33% by weight. PE is a commercial low-density polyethylene.
C. Comparative Example 1:
Single-layer film having the structure:
Scrap 70 ~m The film was extruded in a single layer. The scrap layer contained 15% by weight of primer and 85% by weight of - -recycled material. The primer was an LLDPE-based polymer grafted with maleic acid anhydride. The content of po}yamide in the recycled material was 33% by weight.
D. Comparative Examplç_2:
Single-layer film having the structure:
r~p 70 ~m The film was extruded in a single layer. The scrap layer contained < 1% by weight of primer and < 99% by weight of recycled material. The proportion of polyamide in the recycled material was 33% by weight.
The elongation at tear of the aforementioned filmq A, B, C
and D was measured to DIN 53 455 and the deep-drawing 2 1 ~
properties were evaluated as previously described. The results are shown in Table 1:
Table 1: Comparison between the film structures A, B, C and D
Elongation Deep-drawing Proportion of at tear (%) properties of primer in the scrap A.Example 1 485 + 19 + 20%
B.Example 2 436 + 12 + 15%
15 C.Comparison 1 326 + 37 - 15%
D.Comparison 2 36 + 24 -- < 1%
The single-layer film D, which was produced substantially without a primer, was clearly not deep-drawable. Film C
shows that the primer does not result in adequate deep-drawing properties when used alone. Films A and B produced according to the invention were surprisingly deep-drawable.
The measured elongation at tear emphasises the measured deep-drawing properties. The deep-drawable films A and B
have much higher elongation at tear than films C and D, which were not deep-drawable.
~: ~
Marked "+"
The elongation at tear to DIN 53 455 was determined at the same time as the deep-drawing capacity was experimentally - 21 222~8 ,. ", , ~.
evaluated. The "elongation at tear" means the alteration in length of the te~t-piece in mm at the tearing force, relative to the original measured length in mm (see definition in DIN 53 455). To this end, tensile tests were made to the aforementioned DIN. Test-pieces 15 mm wide were investigated at 23C and 50% relative air humidity.
The test speed was 100 mm/min.
The invention will be illustrated with reference to the 10 following examples: -A. Exam~le 1: -Two-layer film having the structure: -Scrap / ~va 120 / 50 ,um The film was made by co-extrusion. The scrap layer contained 20% by weight of primer and 80% by weight of recycled material. The primer was an LLDPE-based polymer grafted with maleic acid anhydride. The proportion of ~ 25 polyamide in the recycled material was 33% by weight. EVA
i is an ethylene/vinyl acetate copolymer containing 5% by weight of vinyl acetate.
B. Exa~elQ Zl Two-layer film having the structure:
8crap / PE
70 / 70 ,um -~ , ` 2122~
The film was made by adhesive lamination, the scrap layer and the PE layer first being extruded in the form of a single-layer film. The scrap layer contained 15% by weight of primer and 85% by weight of recycled material. The primer was an LLDPE-based polymer grafted with maleic acid anhydride. The proportion of polyamide in the recycled material was 33% by weight. PE is a commercial low-density polyethylene.
C. Comparative Example 1:
Single-layer film having the structure:
Scrap 70 ~m The film was extruded in a single layer. The scrap layer contained 15% by weight of primer and 85% by weight of - -recycled material. The primer was an LLDPE-based polymer grafted with maleic acid anhydride. The content of po}yamide in the recycled material was 33% by weight.
D. Comparative Examplç_2:
Single-layer film having the structure:
r~p 70 ~m The film was extruded in a single layer. The scrap layer contained < 1% by weight of primer and < 99% by weight of recycled material. The proportion of polyamide in the recycled material was 33% by weight.
The elongation at tear of the aforementioned filmq A, B, C
and D was measured to DIN 53 455 and the deep-drawing 2 1 ~
properties were evaluated as previously described. The results are shown in Table 1:
Table 1: Comparison between the film structures A, B, C and D
Elongation Deep-drawing Proportion of at tear (%) properties of primer in the scrap A.Example 1 485 + 19 + 20%
B.Example 2 436 + 12 + 15%
15 C.Comparison 1 326 + 37 - 15%
D.Comparison 2 36 + 24 -- < 1%
The single-layer film D, which was produced substantially without a primer, was clearly not deep-drawable. Film C
shows that the primer does not result in adequate deep-drawing properties when used alone. Films A and B produced according to the invention were surprisingly deep-drawable.
The measured elongation at tear emphasises the measured deep-drawing properties. The deep-drawable films A and B
have much higher elongation at tear than films C and D, which were not deep-drawable.
~: ~
Claims (11)
1. A multi-layer sealable recycled film comprising at least one layer of scrap and one sealing layer, characterised in that - the film is deep-drawable, - the scrap layer comprises recycled polyamide/
polyolefin and a primer, the proportion of recycled material in the scrap layer being 60 to 95% by weight and the proportion of primer being
polyolefin and a primer, the proportion of recycled material in the scrap layer being 60 to 95% by weight and the proportion of primer being
2 to 20 % by weight, - the recycled material has a polyamide content of
3 to 45% by weight and - the sealing layer has one or more layers and consists of polyolefinic polymer or copolymer, the layers optionally being the same or different.
2. A film according to claim 1, characterised in that the film is made by adhesive lamination, extrusion, co-extrusion, extrusion lamination and/or extrusion coating and the film optionally contains additional intermediate layers of primer.
3. A film according to claims 1 and 2, characterised in that the polyolefinic polymer or copolymer in the sealing layer is a polyethylene, polypropylene, polypropylene copolymer, ethylene/vinyl acetate copolymer, ethylene/acrylic acid copolymer, ethylene/methylene acrylic acid copolymer or ionomer or a blend of the aforementioned polymers.
2. A film according to claim 1, characterised in that the film is made by adhesive lamination, extrusion, co-extrusion, extrusion lamination and/or extrusion coating and the film optionally contains additional intermediate layers of primer.
3. A film according to claims 1 and 2, characterised in that the polyolefinic polymer or copolymer in the sealing layer is a polyethylene, polypropylene, polypropylene copolymer, ethylene/vinyl acetate copolymer, ethylene/acrylic acid copolymer, ethylene/methylene acrylic acid copolymer or ionomer or a blend of the aforementioned polymers.
4. A film according to claims 1 to 3, characterised in that the recycled material is regenerated, regranulated or agglomerated on the basis of polyamide/polyolefin film waste or is a mixture of two or three of the aforementioned recycled materials.
5. A film according to claims 1 to 4, characterised in that the polyamide consists of aliphatic polyamides such as PA 6, PA 11, PA 12, PA 66, PA 6.66, PA 6.8, PA 6.9, PA 6.10, PA 6.11 or PA 6.12, or a copolymer of the monomer units therein or a mixture of the aforementioned aliphatic polyamides.
6. A film according to claims 1 to 5, characterised in that the primer is an anhydride-modified polyolefin or an anhydride-modified ethylene/vinyl acetate copolymer.
7. A film according to claims 1 to 6, characterised in that the scrap layer makes up 30 to 90%, preferably 50 to 70% and the sealing layer makes up 10 to 70%, preferably 30 to 50%, of the thickness of the film comprising the scrap layer and the sealing layer.
8. A film according to claims 1 to 7, characterised in that the film has a total thickness of 0.050 to 0 . 500 mm, preferably 0.080 to 0.400 mm.
9. A film according to claims 1 to 8, characterised in that at least one layer is coloured and/or printed.
10. Use of the film according to any of claims 1 to 9, characterised in that the film is used as packaging for industrial medical equipment, semi-finished products and finished products or for packaging of food.
11
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP4314214.1 | 1993-04-30 | ||
| DE4314214A DE4314214A1 (en) | 1993-04-30 | 1993-04-30 | Deep-drawable, sealable, multi-layered recycling film based on polyamide and polyolefins with high recycled content |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2122288A1 true CA2122288A1 (en) | 1994-10-31 |
Family
ID=6486789
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002122288A Abandoned CA2122288A1 (en) | 1993-04-30 | 1994-04-27 | Deep-drawable, sealable, multi-layer recycled film based on polyamide and polyolefins with a high content of recycled material |
Country Status (14)
| Country | Link |
|---|---|
| EP (1) | EP0622182B1 (en) |
| JP (1) | JPH06320688A (en) |
| KR (1) | KR100292215B1 (en) |
| AT (1) | ATE185741T1 (en) |
| CA (1) | CA2122288A1 (en) |
| CZ (1) | CZ288265B6 (en) |
| DE (2) | DE4314214A1 (en) |
| DK (1) | DK0622182T3 (en) |
| ES (1) | ES2137279T3 (en) |
| FI (1) | FI941967A (en) |
| GR (1) | GR3032259T3 (en) |
| HU (1) | HU211192B (en) |
| PL (1) | PL174088B1 (en) |
| PT (1) | PT622182E (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7270860B2 (en) | 1999-11-22 | 2007-09-18 | Hollister Incorporated | Multilayer chlorine-free film with barrier layer of a polyamide blend and ostomy pouches formed therefrom |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT403266B (en) * | 1995-09-28 | 1997-12-29 | Danubia Petrochem Polymere | MULTILAYER PACKAGING FILM BASED ON POLYPROPYLENE AND THEIR USE |
| DE19538910A1 (en) * | 1995-10-19 | 1997-04-24 | Danubia Petrochem Deutschland | Multi-layer polyolefin-containing packaging film for food etc. |
| EP0807519A3 (en) * | 1996-05-14 | 1999-12-08 | Elf Atochem S.A. | High-frequency sealable multilayer film |
| DE19721142A1 (en) * | 1997-05-21 | 1998-11-26 | Kalle Nalo Gmbh | Multi-layer, biaxially stretched food casing with two oxygen barrier layers |
| DK1101605T3 (en) * | 1999-11-22 | 2006-10-02 | Hollister Inc | Multilayer chlorine-free foil barrier layer of a polyamide mixture and ostomy bags formed therefrom |
| JP2016087892A (en) * | 2014-10-31 | 2016-05-23 | 住友ベークライト株式会社 | Multilayered film and method for producing the same |
| PL235429B1 (en) * | 2017-11-29 | 2020-07-27 | Duet Spolka Z Ograniczona Odpowiedzialnoscia | Multilayer polyolefine film |
| CN115135494A (en) * | 2020-02-26 | 2022-09-30 | 希悦尔公司 | Packaging article film with recycled content |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50105783A (en) * | 1974-01-29 | 1975-08-20 | ||
| US4668571A (en) * | 1986-05-02 | 1987-05-26 | The Dow Chemical Company | Coextrustion tie layer and process for producing such tie layer |
| JPS6438233A (en) * | 1987-08-04 | 1989-02-08 | Showa Denko Kk | Multilayer construction |
| JPS6438232A (en) * | 1987-08-04 | 1989-02-08 | Showa Denko Kk | Multilayer construction |
| JP2857205B2 (en) * | 1990-02-15 | 1999-02-17 | 住友ベークライト株式会社 | Collection and reproduction method of multilayer film |
| JPH03262642A (en) * | 1990-03-14 | 1991-11-22 | Showa Denko Kk | Laminate |
| JP3112471B2 (en) * | 1990-09-11 | 2000-11-27 | 住友ベークライト株式会社 | Collection and reproduction method of multilayer film |
| JP2834567B2 (en) * | 1990-10-30 | 1998-12-09 | 昭和電工株式会社 | Resin composition |
| JPH0564868A (en) * | 1991-07-08 | 1993-03-19 | Mitsubishi Kasei Polytec Co | Heat-sealable laminated film having high dimensional stability |
| DE9206106U1 (en) * | 1992-05-06 | 1992-08-06 | Ems-Inventa AG, Zürich | Surface-resistant components |
| DE59302667D1 (en) * | 1992-07-20 | 1996-06-27 | Bayer Ag | Impact-resistant, possibly filled polyamide mixtures with polyamide / polyethylene composite film waste |
-
1993
- 1993-04-30 DE DE4314214A patent/DE4314214A1/en not_active Withdrawn
-
1994
- 1994-04-18 DK DK94105987T patent/DK0622182T3/en active
- 1994-04-18 PT PT622182T patent/PT622182E/en unknown
- 1994-04-18 ES ES94105987T patent/ES2137279T3/en not_active Expired - Lifetime
- 1994-04-18 AT AT94105987T patent/ATE185741T1/en not_active IP Right Cessation
- 1994-04-18 EP EP94105987A patent/EP0622182B1/en not_active Expired - Lifetime
- 1994-04-18 DE DE59408828T patent/DE59408828D1/en not_active Expired - Fee Related
- 1994-04-22 JP JP6106153A patent/JPH06320688A/en active Pending
- 1994-04-27 CA CA002122288A patent/CA2122288A1/en not_active Abandoned
- 1994-04-27 PL PL94303228A patent/PL174088B1/en unknown
- 1994-04-28 KR KR1019940009092A patent/KR100292215B1/en not_active IP Right Cessation
- 1994-04-28 FI FI941967A patent/FI941967A/en unknown
- 1994-04-29 HU HU9401244A patent/HU211192B/en not_active IP Right Cessation
- 1994-04-29 CZ CZ19941051A patent/CZ288265B6/en not_active IP Right Cessation
-
1999
- 1999-12-28 GR GR990403344T patent/GR3032259T3/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7270860B2 (en) | 1999-11-22 | 2007-09-18 | Hollister Incorporated | Multilayer chlorine-free film with barrier layer of a polyamide blend and ostomy pouches formed therefrom |
Also Published As
| Publication number | Publication date |
|---|---|
| KR100292215B1 (en) | 2001-09-17 |
| FI941967A0 (en) | 1994-04-28 |
| PL174088B1 (en) | 1998-06-30 |
| CZ288265B6 (en) | 2001-05-16 |
| HU211192B (en) | 1995-11-28 |
| PT622182E (en) | 2000-04-28 |
| EP0622182B1 (en) | 1999-10-20 |
| JPH06320688A (en) | 1994-11-22 |
| GR3032259T3 (en) | 2000-04-27 |
| FI941967A (en) | 1994-10-31 |
| ATE185741T1 (en) | 1999-11-15 |
| DE59408828D1 (en) | 1999-11-25 |
| DE4314214A1 (en) | 1994-11-03 |
| ES2137279T3 (en) | 1999-12-16 |
| EP0622182A2 (en) | 1994-11-02 |
| CZ105194A3 (en) | 1994-11-16 |
| DK0622182T3 (en) | 2000-04-25 |
| HU9401244D0 (en) | 1994-08-29 |
| HUT68225A (en) | 1995-06-28 |
| EP0622182A3 (en) | 1994-11-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |