PH26587A - High barrier metallized film - Google Patents
High barrier metallized film Download PDFInfo
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- PH26587A PH26587A PH39363A PH39363A PH26587A PH 26587 A PH26587 A PH 26587A PH 39363 A PH39363 A PH 39363A PH 39363 A PH39363 A PH 39363A PH 26587 A PH26587 A PH 26587A
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- metallised
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- 230000004888 barrier function Effects 0.000 title description 31
- 239000011104 metalized film Substances 0.000 title description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 39
- 239000001301 oxygen Substances 0.000 claims description 39
- 229910052760 oxygen Inorganic materials 0.000 claims description 39
- 230000035699 permeability Effects 0.000 claims description 35
- 238000000576 coating method Methods 0.000 claims description 25
- 239000011248 coating agent Substances 0.000 claims description 23
- 229920000098 polyolefin Polymers 0.000 claims description 14
- 239000004627 regenerated cellulose Substances 0.000 claims description 12
- -1 polyethylene Polymers 0.000 claims description 11
- 239000002985 plastic film Substances 0.000 claims description 10
- 229920006255 plastic film Polymers 0.000 claims description 9
- 229920003023 plastic Polymers 0.000 claims description 8
- 239000004033 plastic Substances 0.000 claims description 8
- 239000011347 resin Substances 0.000 claims description 8
- 229920005989 resin Polymers 0.000 claims description 8
- 239000004743 Polypropylene Substances 0.000 claims description 7
- 229920001155 polypropylene Polymers 0.000 claims description 7
- 239000000020 Nitrocellulose Substances 0.000 claims description 5
- 239000004698 Polyethylene Substances 0.000 claims description 5
- 229920001220 nitrocellulos Polymers 0.000 claims description 5
- 239000000758 substrate Substances 0.000 claims description 5
- 229920000573 polyethylene Polymers 0.000 claims description 4
- 239000002952 polymeric resin Substances 0.000 claims description 3
- 229920002678 cellulose Polymers 0.000 claims description 2
- 239000001913 cellulose Substances 0.000 claims description 2
- 229920003002 synthetic resin Polymers 0.000 claims 1
- 239000010408 film Substances 0.000 description 58
- 239000000463 material Substances 0.000 description 15
- 229920001328 Polyvinylidene chloride Polymers 0.000 description 11
- 230000003287 optical effect Effects 0.000 description 11
- 239000005033 polyvinylidene chloride Substances 0.000 description 11
- 229920000134 Metallised film Polymers 0.000 description 10
- 239000004922 lacquer Substances 0.000 description 10
- 238000000034 method Methods 0.000 description 10
- 238000001465 metallisation Methods 0.000 description 9
- 239000005026 oriented polypropylene Substances 0.000 description 8
- 239000007789 gas Substances 0.000 description 7
- 238000010030 laminating Methods 0.000 description 7
- 238000004806 packaging method and process Methods 0.000 description 7
- 239000002904 solvent Substances 0.000 description 7
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 6
- 229920001169 thermoplastic Polymers 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 229920000298 Cellophane Polymers 0.000 description 5
- 239000002131 composite material Substances 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- FJWGYAHXMCUOOM-QHOUIDNNSA-N [(2s,3r,4s,5r,6r)-2-[(2r,3r,4s,5r,6s)-4,5-dinitrooxy-2-(nitrooxymethyl)-6-[(2r,3r,4s,5r,6s)-4,5,6-trinitrooxy-2-(nitrooxymethyl)oxan-3-yl]oxyoxan-3-yl]oxy-3,5-dinitrooxy-6-(nitrooxymethyl)oxan-4-yl] nitrate Chemical compound O([C@@H]1O[C@@H]([C@H]([C@H](O[N+]([O-])=O)[C@H]1O[N+]([O-])=O)O[C@H]1[C@@H]([C@@H](O[N+]([O-])=O)[C@H](O[N+]([O-])=O)[C@@H](CO[N+]([O-])=O)O1)O[N+]([O-])=O)CO[N+](=O)[O-])[C@@H]1[C@@H](CO[N+]([O-])=O)O[C@@H](O[N+]([O-])=O)[C@H](O[N+]([O-])=O)[C@H]1O[N+]([O-])=O FJWGYAHXMCUOOM-QHOUIDNNSA-N 0.000 description 4
- 229940079938 nitrocellulose Drugs 0.000 description 4
- 229920000728 polyester Polymers 0.000 description 4
- 239000004411 aluminium Substances 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 239000000976 ink Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000010943 off-gassing Methods 0.000 description 3
- 239000005022 packaging material Substances 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 239000004923 Acrylic lacquer Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000009470 controlled atmosphere packaging Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 239000011140 metalized polyester Substances 0.000 description 2
- 229920006267 polyester film Polymers 0.000 description 2
- 229920001225 polyester resin Polymers 0.000 description 2
- 239000004645 polyester resin Substances 0.000 description 2
- 238000004626 scanning electron microscopy Methods 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 208000023514 Barrett esophagus Diseases 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010382 chemical cross-linking Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 229920002457 flexible plastic Polymers 0.000 description 1
- 238000007756 gravure coating Methods 0.000 description 1
- 238000007757 hot melt coating Methods 0.000 description 1
- 239000002651 laminated plastic film Substances 0.000 description 1
- 229920001684 low density polyethylene Polymers 0.000 description 1
- 239000004702 low-density polyethylene Substances 0.000 description 1
- 230000001617 migratory effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000006223 plastic coating Substances 0.000 description 1
- 239000000088 plastic resin Substances 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- KKEYFWRCBNTPAC-UHFFFAOYSA-L terephthalate(2-) Chemical compound [O-]C(=O)C1=CC=C(C([O-])=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-L 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
- 238000004627 transmission electron microscopy Methods 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Laminated Bodies (AREA)
Description
MATH 0 ry YA y . 2653 o 3 5] Ei ce & - Lh - 1 - .
Cy
HIGH BARRIER METALLISED or =
This invention relates to coated and metallised plastic films which are especially, but not exclusively, useful for packaging materials, particularly materials which are sensitive to oxygen and/or water vapour.
It is well known to package materials in plastic films or plastic film laminates. Where the materials are sensitive to oxygen and/or water vapour (e.g. materials such as certain foodstuffs, beverages, chemicals, pharmaceuticals, seeds, electrical components, etc.), a plastics packaging material is chosen which will provide a barrier against ingress of oxygen and/or water vapour. It is also well known to package certain foodstuffs in an atmosphere of gas contained within a plastics material chosen for its low permeability to that gas (controlled atmosphere packaging).
One such plastics film which has the property of low permeability to oxygen, other gases and water vapour is metallised poly (ethylene glycol) terephthalate (hereafter
PET), a single web of which may typically provide an oxygen barrier of about 1 cc/metre’/24 hours (at 23°C, 0% RH) and a moisture barrier of about 1 gram/metre’ /24 hours (at 38°C, 90% RH). Metallised PET can be further laminated to a heat sealable film such as a polyolefine (e.g. polyethylene or polypropylene) to produce a material suitable for packaging cxygen or moisture sensitive products, but gas and moisture barrier are not significantly improved by this lamination.
By laminating metallised PET to a further web of metallised film, either another ply of metallised PET or another metallised thermoplastic polymer film, further reductions in permeability can be achieved. U.K. patent specification no. 2103999A describes such a packaging material comprising two layers of metallised thermoplastic polymer film, at least one of which is metallised PET.
For some applications it is desirable to decorate the package with, for example, print, and for reasons of security and integrity this print is often preferably sandwiched within the laminate. This can be achieved by printing the PET, and metallising over the print before further conversion. This procedure normally gives a material with a greater permeability than that of the film metallised directly. By careful choice of inks it is possible to keep this deterioration in barrier within acceptable limits, but no instances have been disclosed of use of this technique to improve barrier.
Other plastic films which have the property of low permeability to moisture (but not oxygen) are metallised polyolefines, such as metallised oriented polypropylene (hereafter OPP) or metallised polyethylene (hereafter PE), single webs of which may typically provide a moisture barrier of about 1 gram/metre’/24 hours (at 38°C, 90% RH), and laminates of such metallised polyolefine films to unmetallised films, suitable for packaging of moisture sensitive materials, are described in U.K. patent specification no. 1566925. Gas and moisture barrier are not significantly improved over those of the single web metallised film by this lamination, unless the clear web itself or the adhesive has good barrier properties. For some applications, it is desirable to decorate the package with, for example, print, and the print is often preferably sandwiched within the laminate. This is normally achieved by printing the clear web and laminating to the metallised
26. v - 3 - ‘NJ pL ) polyolefine web. Gas and moisture barrier are not significantly improved over that of the single web metallised film unless the clear web itself or the ink or the adhesive has good barrier properties. Sandwiched decoration could also be achieved by printing the clear polyolefine web and metallising over the print, and then laminating to another clear polyolefine web, but no benefits are disclosed for this procedure and it is not used commercially, the former process described above being preferred.
By laminating a metallised polyolefine film to a further web of a metallised polyolefine film, further reductions in permeability can be achieved and a material with both good moisture barrier and good oxygen barrier produced. European patent specification no. 154428 describes such laminates.
Polypropylene films with a coating on one or both sides and metallised on one or more of the coated surfaces are also known and commercially available. If the said coating is of a thermoplastic polymer resin with no particular barrier properties, such as an acrylic resin, oxygen permeability of the unmetallised coated film is high (typically 500 - 1000 cc/metre’/24 hours at 23°C, 0% RH) and oxygen permeability after metallisation is also correspondingly high (greater than 10 cc/metre’/24 hours at 23°C, 0% RH). If the said coating is of a thermoplastic polymer resin with good barrier properties, such as a polyvinylidene chloride resin, oxygen permeability of the coated film is significantly reduced (typically 25 cc/metre’/24 hours at 23°C, 0% RH) and oxygen permeability after metallisation is correspondingly low (typically less than 5cc/metre’/24 hours at 23°C, 0% RH). One such commercially available polyvinylidene chloride coated and metallised OPP film is Mobil MB778 which typically has an oxygen permeability of about lcc/metre”’/24 hours at 23°C,
4 a) 2) LL SFM 0% RH. Such films are widely used for packaging either in single web form or laminated to another unmetallised web.
For applications where it is desirable to decorate the package with, for example, print, and to sandwich said
C print within a laminate, the unmetallised web is normally printed and laminated to the metallised coated polypropylene web. No benefits are disclosed for printing a coated polypropylene web, metallising over the print, and laminating to another clear web, and it is not used
J commercially, the former process described above being preferred.
Another film with moderate barrier to oxygen and moisture is regenerated cellulose film coated on both sides a with polyvinylidene chloride. One commercially available \¢ example of such a PVdC coated regenerated cellulose film is
MXXT/A, produced by British Cellophane Limited, which has an oxygen permeability of typically 5 - 7 cc/m’/24 hours (at 23°C, 0% RH) and an MVTR of typically 5S — 6 g/m’/24 hours (at 38°C, 90% RH). This can be metallised, but the
KG metallised product (one commercially available example of which is Cello M, produced by British Cellophane Limited) does not have significantly better oxygen or moisture barrier than the base film (typically an oxygen permeability of 4 - 5 cc/m’/24 hours (at 23°C, 0% RH) and an MVTR of 4 -5
Ab g/m?/24 hours (at 38°C, 90% RH). By laminating such a metallised polyvinylidene chloride coated regenerated cellulose film to a further web of metallised film, such as another metallised polyvinylidene chloride coated regenerated cellulose film, or a metallised polyolefine film or a metallised polyester film significant reductions in permeability can be achieved and a material with both good oxygen barrier and good moisture barrier produced. Such laminates are described in, for example, FEuropean patent specification number 154428. ‘
Whilst laminates as described above of metallised polyolefine films to other metallised polyolefine films or f : - 5 — . - metallised cellophane films or metallised polyester films are highly advantageous in packaging moisture and/or oxygen sensitive materials, because of their excellent barrier properties, they also have some disadvantages, for example:- (a) Cost. Relative to many other thermoplastic films and laminates used in packaging, these laminates are expensive, so for some end uses their use is precluded on cost grounds. (b) If it is desired to decorate the pack with a ° sandwiched print, this can often only be achieved by laminating on a further ply of reverse printed film, which both increases costs and reduces flexibility of the laminate.
Metallised polyvinylidene chloride coated OPP films are generally less expensive than laminates but their cost of manufacture and suitability for some applications can be limited by the facts that: (a) they cannot be readily recycled during manufacture, because the polyvinylidene chloride coating pyrolyses, contaminating the polypropylene and producing an odorous film containing black particles of degraded material. (b) in some countries, waste disposal legislation precludes the use of polyvinylidene chloride coated films because of the acid gases they produce when incinerated.
We have now found that, in contrast to prior teachings, it is not necessary to combine together two metallised films as a laminate or to coat a film with a barrier lacquer such as polyvinylidene chloride prior to metallisation, in order to achieve very high barrier properties. Rather, we have found that by applying to the surface of a polyolefine or regenerated cellulose film a thin but smooth layer of a plastic coating with rélatively little inherent barrier, of the type described below, and metallising over the coating, very high barrier can be
~ 6 — achieved, generally at least a factor of ten and up to a factor of more than one thousand times better than the barrier of the metallised uncoated film. The smoothness of the coating is crucial to the invention.
In accordance with the present invention, there is provided a flexible plastic film A, coated on one or both faces with a thin coating B to give a smooth finish, and metallised on one or both of the coated surfaces. The invention also provides a process for packaging a material, in which process a coated and metallised film as defined above, or a laminate of such a film to other films, is used.
Such films and laminates are especially but not exclusively useful for packaging of materials sensitive to oxygen and/or water vapour or for controlled atmosphere packaging of foodstuffs.
I'ilm A is preferably a polyolefine or regenerated cellulose film of any thickness which can be metallised, including composites or coextrusions of the above materials, or variants coated with other plastics, whether or not these other plastics have barrier properties. The film should preferably contain a low level of migratory additives such as slip additives in the surface to be metallised, since these will migrate to the surface and although not substantially affecting barrier properties could disrupt adhesion of the metal layer.
Coating B can be any plastic resin coating other than polyvinylidene chloride, with a thickness of less than microns, which is not required to have any inherent barrier properties, but which will adhere to and provide cover for the film surface, will give a smooth surface for metallisation and which will not significantly degrade, crack, craze or delaminate on metallisation. Said smoothness and integrity are most conveniently assessed after metallisation by analytical techniques such as scanning electron microscopy (SEM) at a magnification of about 15,000 - 50,000 times. Such coatings include water based, solvent based or solventless thermoplastic lacquers or inks based on resins such as polyester, nitrocellulose, acrylic or vinyl, hot melt coatings, extrusion coated thermoplastic resins and curing resin systems (cured by chemical cross-linking, ultra violet or electron beam irradiation or any other system). Multiple layers of coatings, whether of the same resin or different resins, are included. We prefer to use solvent-based polyester or nitrocellulose lacquers with a coating thickness of between 0.5 and 2 microns. The coating can be applied by any suitable coating technique, either during manufacture of the film or in a subsequent process, provided this technique gives a smooth surface for metallisation. We prefer to use gravure coating. The thickness of the metal layer should be such that at its minimum thickness it provides a largely continuous metal layer and at its maximum thickness it still has adequate adhesion to the substrate. Thickness of thin vacuum deposited metal layers is normally, and most conveniently, quoted in terms of their light transmission or optical density. An optical density in the range 1.0 - 4.0 is preferred with the range 1.8 - 3.5 being especially preferred. Any metal which on vacuum deposition gives a barrier layer is satisfactory, with aluminium being preferred.
In order that the invention may be more fully understood, the following Examples are given by way of illustration only.
Example 1 2000 metres of a 30 micron coextruded OPP film (commercially available as Propafilm MVG from ICI Films PLC) were coated on the corona treated surface with 1.5 grams/metre’ of a proprietary solvent based lacquer based on a polyester resin and dried to remove solvent. A further 2000 metres of film were left uncoated. Prior to coating, the OPP film had an oxygen permeability of greater than 1000 cc/metre’/24 hours at 23°C, 0% RH. After coating oxygen permeability was still greater than 1000 cc/metre’/24 hours at 23°C, 07 RH. The 4000 metre composite reel of coated and uncoated film was metallised with aluminium on the coated/treated surface to an optical density of 2.4. Oxygen permeability of the coated part of the film after metallisation was 0.8 cc/metre’/24 hours (at 23°C, 0% RH) and MVIR 0.13 gram/metre’/24 hours (at 38°C, 90% RH). The uncoated control had an oxygen permeability of 90 cc/metre’/24 hours (at 23°C, 0% RH) and MVTR of 1.4 gram/metre’ /24 hours (at 38°C, 90% RH). Examination of the metallised coated surface by scanning electron microscopy at magnifications of 17,000 and 50,000 showed a relatively smooth appearance with fine grain topography and few macroscopic defects such as scratches or pits. In contrast, the metallised uncoated surface was rough with many defects in the metallisation. Comparison of the size of the aluminium crystallites on the coated and uncoated metallised {ilms by transmission electron microscopy showed that both had a crystallite diameter of 300 - 350 Angstroms, i.e. not significantly different.
Example 2 : Example 1 was repeated using 40 micron low slip low density polyethylene film (commercially available as
Polyane CT from Prosyn Polyane). Half of the reel was coated on its corona treated side with 1.5 grams/metre’ of the lacquer described in Example 1, and dried. The composite reel was metallised to an optical density of 2.3.
Oxygen permeability of the coated and metallised film was 1.1 cc/metre’/24 hours at 23°C, 0%Z RH compared with 95 cc/metre’/24 hours at 23°C, 07 RH for the uncoated and metallised control. MVTR's (at 38°C, 907 RH) for the example and control were respectively 0.17 and 1.1 gram/metre’/24 hours.
Example 3
Example 1 was repeated using regenerated cellulose film without a polyvinylidene chloride coating. This was coated on both sides with a proprietary solvent based lacquer based on a polyester resin and dried to remove the solvent. Dry coat weight was 1.4 g/m’ on each surface. One coated surface of the film was metallised to an optical density of 2.3. Oxygen permeability of the resultant film was less than 0.1 cc/m*/24 hours at 23°C, 0% RH. MVTR (at 38°C, 90% RH), measured with the metallised surface facing the detector to minimise outgassing of moisture from the cellulose core) was less than 1.0 g/m’/24 hours (unstable reading).
Example 4&4
Example 1 was repeated using 365 gauge PVdC coated regenerated cellulose film (commercially available as Cello
MXXT/A from British Cellophane Limited). Coat weight was 1.5 grams/metre’ and optical density 2.3. Oxygen permeability of the coated and metallised films was 0.02 cc/metre’/24 hours compared with 4.8 cc/metre’/24 hours for the control. MVTR (at 38°C, 90% RH) for the example and control were respectively 1.0 (unstable reading due to moisture outgassing from the regenerated cellulose core) and 4.5 gram/metre’/24 hours.
Example 5
Example 1 was repeated using an acrylic coated 21 micron OPP film (commercially available as MB666 from Mobil
Plastics, and coated on both sides with an acrylic lacquer by the supplier). This was recoated on one of the acrylic surfaces with 1.5 gram/metre’ of a proprietary polyester based lacquer as described above and metallised to an optical density of 2.2. Oxygen permeability of the example film was 0.8 cc/metre’/24 hours compared with 25 cc/metre’/24 hours for the control. MVTR's (at 38°C, 90%
RH) for the example and control were respectively 0.4 and 2.0 gram/metre’ /24 hours.
Example 6
Example 1 was repeated using an acrylic/PVdC coated 21 micron OPP film (commercially available as MB777 from Mobil Plastics and coated on one side with an acrylic lacquer and on the other with a PVdC lacquer by the supplier). This film was recoated with a proprietary polyester based lacquer on the acrylic coated side and metallised. Coat weight was 1.5 grams/metre’ and optical density 2.3. Oxygen permeability of the example film was 0.2 cc/metre’/24 hours compared with 15 cc/metre’/24 hours for the control. MVTR's (at 38°C, 907 RH) for the example and control were respectively 0.2 and 1.0 gram/metre’/24 hours.
Example 7
Example 2 was repeated using a proprietary solvent based lacquer based on a nitro cellulose resin. Coat weight was 1.6 gram/metre’. Oxygen permeability of the base film before coating was greater than 3000 cc/metre’/24 hours at 23°C, OZ RH. After coating, oxygen permeability was still greater than 3000 cc/metre’/24 hours at 23°C, 0% RH. The composite reel was metallised to an optical density of 2.3.
Oxygen permeability of the coated and metallised film was 2.2 cc/metre’/24 hours at 23°C, 0% RH compared with 100 cc/metre’/24 hours at 23°C, 0% RH for the uncoated and metallised control. MVTR's (at 38°C, 90% RH) for the example and control were respectively 0.35 and 1.2 gram/metre’/24 hours.
Example 8
Example 7 was repeated using 365 gauge PVdC coated regenerated cellulose film as the substrate. Coat weight was 1.6 gram/metre’. Oxygen permeability of the base film before coating was 6.9 cc/metre’/24 hours at 23°C, 0% RH.
After coating, oxygen permeability was 6.7 cc/metre’/24 hours at 23°C, 0%Z RH. MVTR's (at 38°C, 907 RH) before and after coating were respectively 6.0 and 5.8 grams/metre’/24 hours. The composite reel was metallised to an optical density of 2.2. Oxygen permeability of the coated and metallised film was 0.03 cc/metre’/24 hours at 23°C, 0% RH compared with 4.4 cc/metre’/24 hours at 23°C, 0% RH for the control. MVTR's (at 38°C, 90% RH) for the example and control were respectively 1.3 (unstable reading due to moisture outgassing from the cellophane core) and 4.5 gram/metre’ /24 hours.
Example 9
Example 7 was repeated using 21 micron Mobil MB777 (as example 5), coating on the acrylic surface. Nitro cellulose coat weight was 1.6 grams/metre’ and optical density 2.3. Oxygen permeability of the example (at 23°C, 0% RH) was 0.4 cc/metre’/24 hours compared with 14 cc/metre’/24 hours for the controls. MVTR's (at 38°C, 907%
RH) were respectively 0.4 and 1.1 gram/metre’ /24 hours.
Claims (10)
- i ; Cl.ilog: 1 Te Lh coated and metollised plastic film havins low permeability to pases, moisture and lirht, which comprises a polyolefine or regenerated cellulose film substrate coated on one or both surfaces with one or more thin Lut smooth layers of a thermosplastic polymer resin ovtionally cro=slinted, of good thermal stability and havinm an oxygen permeability - - yr 20 ry 70 of freater than 20 cc/w /74 hours (at 272°C, 04 =) and wetallined cver the coated surface or surfaces. “e SL plastic film according to cloln ay vherein in the substrate is a rolyoletine.
- De A plastic film according to claim 2, wherein the substrate is a polyethylene.
- \
- 4. L plastic file according to claim 2, wherein the cubetrate 1s a polypropylene.
- 5. a plastic film accordine to claim 7, wherein the subutraie io rereneralted cellulose.
- 6. A plastic film according to claim 7, wherein the coating is based on a polye:nter : resin. i : BAD ORIGINAL == aaa yi . 3 a i Jo : 7.
- A plastic film according to claim 1, i ee 2 Eo wherein the coating is based on a i: E nitrocellulose resin. i E 8e A polyethylene film according to claim E g 5 +1, having an oxygen permeability of less than Sec/m>/ 24 hours (at 23°C, 0% RH). p
- {
- 9. A polypropylene film according to i claim 1, having an oxygen permeability of j less than Sce,/me/ 2k hours (at 223°C, 0% RH). .
- 10.7 A regenerated cellulose film according Fd ‘to claim 1, having an oxygen permeability of 1 L less than Aec/me/ 24 hours (at 23°C, 0% RH). b b L: f 9 : ; kt: -22- 3 E BAD CRIGINAL ; hit
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PH39363A PH26587A (en) | 1989-10-16 | 1989-10-16 | High barrier metallized film |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PH39363A PH26587A (en) | 1989-10-16 | 1989-10-16 | High barrier metallized film |
Publications (1)
Publication Number | Publication Date |
---|---|
PH26587A true PH26587A (en) | 1992-08-19 |
Family
ID=19935784
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PH39363A PH26587A (en) | 1989-10-16 | 1989-10-16 | High barrier metallized film |
Country Status (1)
Country | Link |
---|---|
PH (1) | PH26587A (en) |
-
1989
- 1989-10-16 PH PH39363A patent/PH26587A/en unknown
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