WO2008142139A1 - Stretchable, biodegradable film with improved characteristics - Google Patents

Stretchable, biodegradable film with improved characteristics Download PDF

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Publication number
WO2008142139A1
WO2008142139A1 PCT/EP2008/056319 EP2008056319W WO2008142139A1 WO 2008142139 A1 WO2008142139 A1 WO 2008142139A1 EP 2008056319 W EP2008056319 W EP 2008056319W WO 2008142139 A1 WO2008142139 A1 WO 2008142139A1
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Prior art keywords
stretchable
biodegradable film
film according
aliphatic
diacids
Prior art date
Application number
PCT/EP2008/056319
Other languages
French (fr)
Inventor
Cesare Lorenzetti
Carlo Nicoletti
Original Assignee
A.W.A.X. Progettazione E Ricerca S.R.L.
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Filing date
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Publication of WO2008142139A1 publication Critical patent/WO2008142139A1/en

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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
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • 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
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/28—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of blown tubular films, e.g. by inflation
    • 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
    • B29K2995/0059—Degradable
    • B29K2995/006—Bio-degradable, e.g. bioabsorbable, bioresorbable or bioerodible
    • 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
    • B32B2307/716—Degradable
    • B32B2307/7163—Biodegradable
    • 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
    • B32B2553/00—Packaging equipment or accessories not otherwise provided for
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/15—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
    • B32B37/153—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state at least one layer is extruded and immediately laminated while in semi-molten state
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/28—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding involving assembly of non-flat intermediate products which are flattened at a later step, e.g. tubes

Definitions

  • the present invention relates to a stretchable, biodegradable film particularly suitable for the packaging of food products.
  • the purpose of the present patent comprises a stretchable, biodegradable film with improved properties, particularly suitable for use on automatic packing machines.
  • a stretchable, biodegradable film with improved properties particularly suitable for use on automatic packing machines.
  • polymer families or of polymers utilisable for the preparation of biodegradable films are the aliphatic polyesters and the aliphatic aromatic polyesters.
  • Polyesters derived from hydroxy acids such as poly-lactic acid (PLA) and polymers obtained from aliphatic diacids and aliphatic diols belong to the first category; copolymers obtained from the polycondensation of mixtures of aliphatic diacids, aromatic diacids and aliphatic diols belong to the second.
  • PVA poly-lactic acid
  • copolymers obtained from the polycondensation of mixtures of aliphatic diacids, aromatic diacids and aliphatic diols belong to the second.
  • polyesters to improve their workability can for example be found in WO 2001 -079326 (Eastman Chemical Company), in this case the introduction of ionic groups into the structure of the polymer makes it possible to obtain a sort of reversible crosslinking with a dramatic increase in the melt viscosity and in the so-called melt strength, characteristics fundamental for film blow extrusion.
  • WO 2006097356 presents a polymer with a significant content of monomers obtained from renewable sources (brassilic acid), and in fact it is well known that many aliphatic diacids can be obtained from plant oils or other natural compounds.
  • brassilic acid sebacic acid, dodecanedioic acid and octadecanedioic acid may be mentioned. It is unnecessary here to emphasise the importance and the potential of plastic materials which reduce the consumption of non-renewable fossil resources (petroleum, gas, coal).
  • polymers from poly-condensation such as the polyesters and polyamides lend themselves freely to modification of their properties via an appropriate choice of the molecular structure, and for example materials can be obtained with properties which vary from those of the structural resins (engineering resins) to those of the elastomers.
  • PLA polylactic acid
  • thermoplastic elastomers PLA/polytrimethylene carbonate and PLA/ polyisoprene block copolymers
  • the preparation of stretchable films is effected by blow extrusion or extrusion through a flat head (cast extrusion).
  • the films generally utilised for the packing of foods laid out on trays (for example of polystyrene or cardboard) are preferably prepared by blow extrusion, and in fact this technology makes it possible to obtain films with greater uniformity of stretch in the longitudinal and transverse directions.
  • the resins most commonly used are plasticised PVC, polyolefins such as EVA, LLDPE and LDPE, styrene type polymers and various polymer blends, always based on polyolefins.
  • Machinability is normally understood to mean a combination of technical characteristics which give an indication of the performance of the film on packing machines.
  • biodegradably-based films have an appreciable tendency to breakage during the stretching process.
  • the present invention aims to remedy this disadvantage of the known biodegradably-based films.
  • a film consisting of two layers simply superposed but physically distinct displays performance a great deal better than that of a monolayer film with equal total thickness.
  • a 16 micron film obtained by superposition of two 8 micron films is much more suitable for the operations of packaging as compared to a 16 micron monolayer film.
  • the double layer film was produced by blow extrusion without the bubble being open, in other words the tube was flattened and wound as such, thus forming the required double structure.
  • a subject of the present invention is the use of polymer mixtures particularly suitable for the purposes described above. It has in particular been observed that the addition of a thermoplastic polyurethane with elastomer properties (such as for example that produced and marketed under the name Estane 58213 by Noveon) to the base polymer formulation (consisting for example of the polymer produced and marketed by BASF with the name of Ecoflex F XB 7011 ) appreciably increased the elasticity and the shape memory of the film without in the least prejudicing the biodegradability of the same. Shape memory is a particularly desired characteristic in films for packaging since it renders the film particularly resistant to the handling to which the product may be subjected. This results in a better aesthetic appearance of the pack during its stay on shop shelves.
  • a thermoplastic polyurethane with elastomer properties such as for example that produced and marketed under the name Estane 58213 by Noveon
  • the base polymer formulation consisting for example of the polymer produced and marketed by BASF with the
  • films produced according to the present invention Various films were prepared by blow extrusion of polymers and mixtures thereof; the performance of the films was then evaluated on an Elixa Mega packaging machine produced by AUTOMAC. As headings for comparison between the various films produced, the aesthetic appearance, the number of packs defective as regards weld (under the tray) and cases of film breakage following stretching were assessed. Table 1 shows the formulations of the films prepared, whereas Table 2 shows the characteristics and the assessments of the monolayer film and the (novel) bilayer film. From the data presented, the superiority of the films containing thermoplastic polyurethane and of the novel bilayer structure is obvious.
  • aliphatic polymers aliphatic aromatic polyesters, polyurethanes, polyester amides, mixtures thereof and mixtures with other partially or totally biodegradable polymers and modifications thereof are also cited as components of the stretchable, biodegradable film according to the invention.
  • such films advantageously consist essentially of a copolyester which can be of aliphatic aromatic type obtained by polycondensation, in variable proportions, of monomers and comonomers of aromatic diacids or mixtures of aromatic diacids and esters thereof selected from the series consisting of terephthalic acid, isophthalic acid, orthophthalic acid, dimethyl terephthalate and dimethyl isophthalate, or else of aliphatic aromatic type obtained by poly-condensation, in variable proportions, of monomers and comonomers of aliphatic diacids or mixtures of aliphatic diacids and esters thereof selected from the series consisting of linear aliphatic diacids or mixtures of linear aliphatic diacids with two or more carbon atoms, cycloaliphatic diacids such as cyclo-hexanedicarboxylic acid, diacids obtained by dimer-isation of natural fatty acids and the corresponding hydrogenation products thereof,
  • the said copolyesters can contain components to regulate the rheological or thermal characteristics of the material, such as polyfunctional acids, poly-functional alcohols, monomers containing ionic groups such as salts of sulphonated isophthalic acid or of sulphonated benzoic acid.
  • this copolyester is a block or "random" copolymer of lactic acid with elastomer properties.
  • Each of the two or more layers of the film according to the present invention is itself a triple layer coextruded film of ABC structure, where the layers A, B and C can differ in the content of additives and in the relative proportions of the base polymers.
  • the stretchable, biodegradable film according to the present invention can consist of binary mixtures of polyesters and thermoplastic polyurethanes (TPU), or of binary mixtures of aliphatic aromatic polyesters and polyamide-based copolymers. These films can contain plasticisers, preferably obtained from renewable sources, or also antiblocking additives and lubricant additives.
  • films of polyester-based thermoplastic polyurethane of particularly low thickness were therefore prepared which displayed excellent performance on packing machines using two grades of aromatic-based thermoplastic polyurethane produced by Lubrizol (Estane 58271 and Estane 58277) and a grade of aliphatic polyurethane produced by Merquinsa (Pearlthane D92F90).
  • the films were prepared by the procedure previously described with excellent results in terms of mechanical properties and machinability.

Abstract

Stretchable, biodegradable film characterized in that it consists of two or more mechanically joined but physically distinct layers, obtained by blow extrusion. Said film consists of aliphatic polyesters, aliphatic aromatic polyesters, poly-urethanes, polyester amides, mixtures thereof and mixtures with other partially or totally biodegradable polymers and modifications thereof, preferably of one copolyester.

Description

TITLE:
STRETCHABLE, BIODEGRADABLE FILM WITH IMPROVED CHARACTERISTICS
DESCRIPTION The present invention relates to a stretchable, biodegradable film particularly suitable for the packaging of food products.
The patent literature reports many examples of films for food use characterized by biodegradability. Indeed this property is increasingly required in products intended for food packaging because of the obvious environmental benefits connected with this. While on the one hand many descriptions of biodegradable rigid or semirigid films are available, only a few patents describe films characterized by intrinsic stretch-ability (JP 2006224551 , JP 2004351634 Kira Shiko Inc.; US 2006149200, US 2006149199 Kimberly-Clark Worldwide Inc.). This characteristic (stretchability) is of fundamental importance especially for the packing of fresh food products. Moreover, the use of automatic machines for packing requires the use of films with particular characteristics. At present, none of the materials proposed in the literature or available on the market displays characteristics suitable for the purpose.
Hence, the purpose of the present patent comprises a stretchable, biodegradable film with improved properties, particularly suitable for use on automatic packing machines. For a detailed description of the machines generally used for the packaging of foods with stretchable film, reference is made to the document US 5528881.
The problems normally encountered with use on such machines are breakage of the film in the interior of the packaging machine, the difficulty of welding under the support tray for the product to be packed, and poor film elasticity.
Until now, the above characteristics have been one of the principal obstacles to the spread of films based on alternative materials to PVC or polyolefin resins. In the present document, the preparation of a film endowed with properties suitable for the aforesaid purposes is reported.
Examples of polymer families or of polymers utilisable for the preparation of biodegradable films are the aliphatic polyesters and the aliphatic aromatic polyesters.
Polyesters derived from hydroxy acids such as poly-lactic acid (PLA) and polymers obtained from aliphatic diacids and aliphatic diols belong to the first category; copolymers obtained from the polycondensation of mixtures of aliphatic diacids, aromatic diacids and aliphatic diols belong to the second.
Many patents describe in detail the preparation of the aforesaid polymers to remedy the problems intrinsic in such materials such as their poor thermal properties or to better modify mechanical properties and degradation rate.
An interesting modification of polyesters to improve their workability can for example be found in WO 2001 -079326 (Eastman Chemical Company), in this case the introduction of ionic groups into the structure of the polymer makes it possible to obtain a sort of reversible crosslinking with a dramatic increase in the melt viscosity and in the so-called melt strength, characteristics fundamental for film blow extrusion.
Further, a recent patent from Novamont (WO 2006097356) presents a polymer with a significant content of monomers obtained from renewable sources (brassilic acid), and in fact it is well known that many aliphatic diacids can be obtained from plant oils or other natural compounds.
Apart from the already mentioned brassilic acid, sebacic acid, dodecanedioic acid and octadecanedioic acid may be mentioned. It is unnecessary here to emphasise the importance and the potential of plastic materials which reduce the consumption of non-renewable fossil resources (petroleum, gas, coal).
It is interesting to note that polymers from poly-condensation such as the polyesters and polyamides lend themselves freely to modification of their properties via an appropriate choice of the molecular structure, and for example materials can be obtained with properties which vary from those of the structural resins (engineering resins) to those of the elastomers. Very interesting in this sense are the modifications of PLA (polylactic acid); in "Polymer Journal (2002, 34(3), 203-208" and "Biomacromolecules (2003), 4(2), 216-223", for example, the preparation of thermoplastic elastomers (PLA/polytrimethylene carbonate and PLA/ polyisoprene block copolymers) utilisable for the purposes of the present invention is described.
Also extremely promising is the possibility of modifying the properties of the aforesaid materials by means of plasticisers, especially if obtained from natural sources, as reported for example in US 2006/ 0276575A1 from Kao Corporation.
For a more complete list of the biodegradable poly-esters utilisable for the preparation of films for packing, reference is made to the following papers which have recently appeared in the literature:
"Degradable Aliphatic Polyesters" in "Advances in Polymer Science 157", 2001
Springer, Editor A. C. Albertsson;
"Aliphatic-Aromatic Polyesters" by Rolf-Joachim Muller (author) Chap.10 of "Handbook of Biodegradable Polymers", 2005 Rapra, Editor C. Bastioli.
The preparation of stretchable films is effected by blow extrusion or extrusion through a flat head (cast extrusion). The films generally utilised for the packing of foods laid out on trays (for example of polystyrene or cardboard) are preferably prepared by blow extrusion, and in fact this technology makes it possible to obtain films with greater uniformity of stretch in the longitudinal and transverse directions. The resins most commonly used are plasticised PVC, polyolefins such as EVA, LLDPE and LDPE, styrene type polymers and various polymer blends, always based on polyolefins. The last two classes of polymers are more commonly utilised in coextruded, multilayer films (see for example US 4713282 from Mitsubishi) to obtain suitable performance and appropriate "machinability". Machinability is normally understood to mean a combination of technical characteristics which give an indication of the performance of the film on packing machines.
It has been observed that biodegradably-based films have an appreciable tendency to breakage during the stretching process. The present invention aims to remedy this disadvantage of the known biodegradably-based films. According to the present invention, it has in fact been discovered, altogether surprisingly, that a film consisting of two layers simply superposed but physically distinct displays performance a great deal better than that of a monolayer film with equal total thickness. In other words, a 16 micron film obtained by superposition of two 8 micron films is much more suitable for the operations of packaging as compared to a 16 micron monolayer film.
In the detail of the present patent, the double layer film was produced by blow extrusion without the bubble being open, in other words the tube was flattened and wound as such, thus forming the required double structure.
Also a subject of the present invention is the use of polymer mixtures particularly suitable for the purposes described above. It has in particular been observed that the addition of a thermoplastic polyurethane with elastomer properties (such as for example that produced and marketed under the name Estane 58213 by Noveon) to the base polymer formulation (consisting for example of the polymer produced and marketed by BASF with the name of Ecoflex F XB 7011 ) appreciably increased the elasticity and the shape memory of the film without in the least prejudicing the biodegradability of the same. Shape memory is a particularly desired characteristic in films for packaging since it renders the film particularly resistant to the handling to which the product may be subjected. This results in a better aesthetic appearance of the pack during its stay on shop shelves.
Examples of films produced according to the present invention Various films were prepared by blow extrusion of polymers and mixtures thereof; the performance of the films was then evaluated on an Elixa Mega packaging machine produced by AUTOMAC. As headings for comparison between the various films produced, the aesthetic appearance, the number of packs defective as regards weld (under the tray) and cases of film breakage following stretching were assessed. Table 1 shows the formulations of the films prepared, whereas Table 2 shows the characteristics and the assessments of the monolayer film and the (novel) bilayer film. From the data presented, the superiority of the films containing thermoplastic polyurethane and of the novel bilayer structure is obvious.
Table 1 : Film formulations
Trade name Manufacturer Formulations (phr)
FA FB FC
Ecoflex F XB 7011 (base polymer) BASF 100 100 100
Ecoflex Batch AB 1 BASF 1
(antiblock master batch)
Ecoflex Batch SL 1 BASF 1 2 2
(slip agent master batch)
Estane 58213 (TPU) Noveon 10 30
Licowax (oxidised PE wax) Clariant 0.5 0.5 Table 2: Properties of the films
Figure imgf000007_0001
Apart from the components mentioned above, aliphatic polymers, aliphatic aromatic polyesters, polyurethanes, polyester amides, mixtures thereof and mixtures with other partially or totally biodegradable polymers and modifications thereof are also cited as components of the stretchable, biodegradable film according to the invention. In particular, such films advantageously consist essentially of a copolyester which can be of aliphatic aromatic type obtained by polycondensation, in variable proportions, of monomers and comonomers of aromatic diacids or mixtures of aromatic diacids and esters thereof selected from the series consisting of terephthalic acid, isophthalic acid, orthophthalic acid, dimethyl terephthalate and dimethyl isophthalate, or else of aliphatic aromatic type obtained by poly-condensation, in variable proportions, of monomers and comonomers of aliphatic diacids or mixtures of aliphatic diacids and esters thereof selected from the series consisting of linear aliphatic diacids or mixtures of linear aliphatic diacids with two or more carbon atoms, cycloaliphatic diacids such as cyclo-hexanedicarboxylic acid, diacids obtained by dimer-isation of natural fatty acids and the corresponding hydrogenation products thereof, or again of aliphatic aromatic type obtained by polycondensation, in variable proportions, of monomers and comonomers of one diol or several diols selected from the series consisting of ethylene glycol, 1 ,2-propanediol, 1 ,3-propanediol, 1 ,4- butanediol, 1 ,5-pentanediol and 1 ,6-hexanediol. In addition, the said copolyesters can contain components to regulate the rheological or thermal characteristics of the material, such as polyfunctional acids, poly-functional alcohols, monomers containing ionic groups such as salts of sulphonated isophthalic acid or of sulphonated benzoic acid. According to a further characteristic of the invention, this copolyester is a block or "random" copolymer of lactic acid with elastomer properties.
In order to improve the mechanical properties of the stretchable, biodegradable film according to the invention, this is extruded in the presence of chain extenders so as to obtain better mechanical properties.
Each of the two or more layers of the film according to the present invention is itself a triple layer coextruded film of ABC structure, where the layers A, B and C can differ in the content of additives and in the relative proportions of the base polymers. Further, the stretchable, biodegradable film according to the present invention can consist of binary mixtures of polyesters and thermoplastic polyurethanes (TPU), or of binary mixtures of aliphatic aromatic polyesters and polyamide-based copolymers. These films can contain plasticisers, preferably obtained from renewable sources, or also antiblocking additives and lubricant additives.
Finally, according to the present invention, it has altogether surprisingly been found that even using films of polyester-based thermoplastic polyurethane of particularly low thickness, the microbial degradation of these occurs with surprising rapidity which makes it possible to regard such materials as "biodegradable" even according to the strictest standards (EN 13427). According to the invention, films were therefore prepared which displayed excellent performance on packing machines using two grades of aromatic-based thermoplastic polyurethane produced by Lubrizol (Estane 58271 and Estane 58277) and a grade of aliphatic polyurethane produced by Merquinsa (Pearlthane D92F90). The films were prepared by the procedure previously described with excellent results in terms of mechanical properties and machinability.

Claims

1. Stretchable, biodegradable film characterized in that it consists of two or more mechanically joined but physically distinct layers.
2. Stretchable, biodegradable film according to Claim 1 , characterized in that it is obtained by blow extrusion.
3. Stretchable, biodegradable film according to any one of Claims 1 and/or 2, characterized in that it consists of aliphatic polyesters, aliphatic aromatic polyesters, polyurethanes, polyester amides, mixtures thereof and mixtures with other partially or totally biodegradable polymers and modifications thereof.
4. Stretchable, biodegradable film according to Claim 3, characterized in that it consists essentially of one copolyester.
5. Stretchable, biodegradable film according to Claim 4, wherein the copolyester is of aliphatic aromatic type obtained by polycondensation, in variable proportions, of monomers and comonomers of aromatic diacids or mixtures of aromatic diacids and esters thereof selected from the series consisting of terephthalic acid, isophthalic acid, orthophthalic acid, dimethyl terephthalate and dimethyl isophthalate.
6. Stretchable, biodegradable film according to Claim 4, wherein the copolyester is of aliphatic aromatic type obtained by polycondensation, in variable proportions, of monomers and comonomers of aliphatic diacids or mixtures of aliphatic diacids and esters thereof selected from the series consisting of linear aliphatic diacids or mixtures of linear aliphatic diacids with two or more carbon atoms, cycloaliphatic diacids such as cyclohexanedicarboxylic acid, diacids obtained by dimehsation of natural fatty acids and the corresponding hydrogenation products thereof.
7. Stretchable, biodegradable film according to Claim 4, wherein the copolyester is of aliphatic aromatic type obtained by polycondensation, in variable proportions, of monomers and comonomers of one diol or several diols selected from the series consisting of ethylene glycol, 1 ,2-propanediol, 1 ,3-propanediol, 1 ,4-butanediol, 1 ,5-pentanediol and 1 ,6-hexanediol.
8. Stretchable, biodegradable film according to any one of Claims 4 to 7, characterized in that the said copolyesters additionally contain components to regulate the rheological and thermal characteristics of the material, such as polyfunctional acids, poly-functional alcohols, and monomers containing ionic groups such as salts of sulphonated isophthalic acid or of sulphonated benzoic acid.
9. Stretchable, biodegradable film according to any one of Claims 4 to 8, characterized in that the copolyester is a block or "random" copolymer of lactic acid with elastomer properties.
10. Stretchable, biodegradable film according to any one of the previous Claims, characterized in that it is extruded in the presence of chain extenders so as to obtain better mechanical properties.
11. Stretchable, biodegradable film consisting of two or more mechanically joined but physically distinct layers according to any of the previous Claims, characterized in that each of the said two or more layers is itself a triple layer coextruded film of ABC structure, where the layers A, B and C can differ in the content of additives and in the relative proportions of the base polymers.
12. Stretchable, biodegradable film according to Claim 3, characterized in that it consists of binary mixtures of polyesters and thermoplastic polyurethanes (TPU).
13. Stretchable, biodegradable film according to Claim 3, characterized in that it consists of binary mixtures of aliphatic aromatic polyesters and polyamide-based copolymers.
14. Stretchable, biodegradable film according to any one of the previous Claims 1 to 13, characterized in that it contains plasticisers.
15. Stretchable, biodegradable film according to Claim 14, characterized in that the said plasticisers are obtained from renewable sources.
16. Stretchable, biodegradable film according to any one of the previous Claims 1 to 15, characterized in that it contains antiblocking additives and lubricant additives.
17. Stretchable, biodegradable film according to any one of the previous Claims 1 to 16, characterized in that it is made up of two grades of aromatic-based thermoplastic polyurethane produced by Lubrizol (Estane 58271 and Estane 58277) and one grade of aliphatic polyurethane produced by Merquinsa (Pearlthane D92F90).
PCT/EP2008/056319 2007-05-23 2008-05-22 Stretchable, biodegradable film with improved characteristics WO2008142139A1 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110111154A1 (en) * 2008-06-20 2011-05-12 Arkema France Polyamide, composition comprising such a polyamide, and uses thereof
WO2011134872A1 (en) * 2010-04-28 2011-11-03 Dsm Ip Assets B.V. Renewable barrier film
ITMI20102391A1 (en) * 2010-12-23 2012-06-24 Novamont Spa BIODEGRADABLE THERMOPLASTIC ELASTOMER.
US8889945B2 (en) 2010-12-08 2014-11-18 Kimberly-Clark Worldwide, Inc. Elastic film containing a renewable starch polymer

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US20040034149A1 (en) * 2002-08-16 2004-02-19 Garcia Rod A. Essential oils in plastic film
EP1598181A1 (en) * 2003-02-10 2005-11-23 Tamapoly Co., Ltd. Polylactic acid multi-layer film and process for formation thereof
WO2005120808A1 (en) * 2004-06-09 2005-12-22 Novamont S.P.A. Process for the production of biodegradable films having improved mechanical properties

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040034149A1 (en) * 2002-08-16 2004-02-19 Garcia Rod A. Essential oils in plastic film
EP1598181A1 (en) * 2003-02-10 2005-11-23 Tamapoly Co., Ltd. Polylactic acid multi-layer film and process for formation thereof
WO2005120808A1 (en) * 2004-06-09 2005-12-22 Novamont S.P.A. Process for the production of biodegradable films having improved mechanical properties

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110111154A1 (en) * 2008-06-20 2011-05-12 Arkema France Polyamide, composition comprising such a polyamide, and uses thereof
US9599512B2 (en) * 2008-06-20 2017-03-21 Arkema France Polyamide, composition comprising such a polyamide, and uses thereof
WO2011134872A1 (en) * 2010-04-28 2011-11-03 Dsm Ip Assets B.V. Renewable barrier film
US8889945B2 (en) 2010-12-08 2014-11-18 Kimberly-Clark Worldwide, Inc. Elastic film containing a renewable starch polymer
ITMI20102391A1 (en) * 2010-12-23 2012-06-24 Novamont Spa BIODEGRADABLE THERMOPLASTIC ELASTOMER.

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