MXPA06009690A

MXPA06009690A - Biodegradable poly(lactic acid) polymer composition and films, coatings and products comprising biodegradable poly(lactic acid) polymer composition

Info

Publication number: MXPA06009690A
Application number: MXPA/A/2006/009690A
Authority: MX
Inventors: Scheer Frederic; Kelly William
Original assignee: Kelly William; Scheer Frederic
Priority date: 2004-02-27
Filing date: 2006-08-25
Publication date: 2007-04-20

Abstract

The present invention relates to biodegradable polymer compositions comprising poly(lactic acid) and poly(epsilon caprolactone) mixed with organic peroxide and magnesium silicate minerals. In addition, the present invention relates to films, coatings and products made on the basis of said compositions and to a method for their preparation.

Description

COMPOSITION OF POLYMER POLYMER (LACTIC ACID) BIODEGRADABLE AND FILMS, COATINGS AND PRODUCTS THAT UNDERSTAND COMPOSITION OF POLYMER POLY (LACTIC ACID) BIODEGRADABLE FIELD OF THE INVENTION The present invention relates to biodegradable polymeric compositions comprising poly (lactic acid) and poly (e-caprolactone). In addition, the present invention also relates to films, coatings and products made on the basis of said compositions and to a method for their preparation.

BACKGROUND OF THE INVENTION The packaging material and disposable cups, rates and cutlery are widely used today and allow the food material to be sold or consumed under hygienic conditions. Such disposable materials and objects are very useful for consumers and retailers, since they are simply discarded after use and do not need to be washed or cleaned like frets, glassware or conventional cutlery. Thus, the widely disseminated and even increasing use of such materials results in an amount that Increase in garbage produced each day. Currently, plastic waste is provided in garbage incinerators or accumulated in waste dumps, where both solutions mentioned above for waste disposal are associated with environmental problems. In addition, paper and composite materials are often provided with a coating such as, for example, polymer or wax coatings, to increase the strength of the paper raw materials or the composite base, imparting water resistance, improving the brightness, improving the barrier properties, etc. These polymeric or wax coatings nevertheless give rise to various problems when articles comprising polymeric or wax coatings are subjected to recycling or a pulping process again. Therefore, there is a need in the art to eliminate the above problem and provide materials that combine the advantages of the plastics materials currently used, that do not generate environmental contamination and help simplify the processes of recycling or pulping again. Various biodegradable polymers are already known in the state of the art and comprise materials, for example, based on poly (glycolic acid), poly (e) caprolactone), poly (lactic acid) and polydioxanone. However, these polymers require rather complicated production steps and are rather expensive and therefore are currently mainly limited to high value medical applications that require bioabsorbable materials. An object of the present invention therefore is to provide a composition, which composition degrades under normal environmental conditions such as composting that includes moisture, water, air, light or soil bacteria in a controlled period of time which is significantly shorter than the period of time required for the degradation of conventional plastic materials such as, for example, polyethylene. Additionally, such a composition should provide properties for the resultant material required for the respective applications such as, for example, the production of articles, films and coatings. In addition, such a composition must be produced at low costs and must be suitable for production of objects comprising said composition in large quantities. Furthermore, such a composition must allow to be processed by means of devices and methods of the state of the art. "In addition, such composition should provide the ' - possibility. of being able to be elaborated at least partially from renewable resources. When applied as a film or a coating on a paper or a composite material, said composition must provide degradation properties that facilitate the re-working of the pulp or the recycling of the paper or composite materials. These and other objects will become apparent from the following detailed description of the present invention which provides a biodegradable composition which comprises between 40 and 85% by weight of poly (lactic acid) polymer, between 10 and 40% by weight of poly (e caprolactone) polymer, each based on the total weight of the biodegradable composition.

BRIEF DESCRIPTION OF THE INVENTION A composition of the present invention is biodegradable when exposed to specific environmental conditions such as composting which results in losses of some properties that can be measured by standard methods appropriate for plastics and in application, in a period of time that determines its classification. -For example, composting is a managed procedure that controls the biological decomposition and transformation of biodegradable materials into substances similar to humus called compost: Mesophilic and thermophilic aerobic degradation of organic material to produce compost; the transformation of material biologically susceptible to decomposition through a controlled process of biooxidation that proceeds through the mesophilic and thermophilic phases and that results in the production of carbon dioxide, water, minerals and stabilized organic matter (compost or humus) ( ASTM terminology). Consequently, all major components, poly (lactic acid) and poly (e caprolactone) will degrade to small organic fragments which will create stabilized organic material and will not introduce any danger or heavy metals to the soil. As a result, the objects made from the composition of the present invention will not contribute to an additional increase of garbage dumps, and on the contrary will allow the creation of organic fertilizers such as compost while such objectives simultaneously provide all the advantages of disposable objects highly valued by consumers and the producer. Objects made from a composition according to the present invention can be discarded after use, and are essentially light in weight and do not need to be transported to a place where they should be cleaned. In particular, the objects made of a composition according to the present invention provide the advantage that objects thrown in parks or on beaches will degrade and vanish after a certain time. However, this composition is not generated to serve as an "authorization to dump" the environment. In addition, the compositions according to the present invention provide physical properties not inherent to poly (lactic acid) and provide improvements with respect to processing susceptibility, production costs and heat resistance together with improved flexibility and ductility. In addition, a composition according to the present invention can be produced completely or partially from renewable resources, when it is desired to produce truly ecological products. In addition, a composition according to the present invention can be adapted to various processing methods known in the art.

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a biodegradable plastic. The term "biodegradable plastic" - belongs to a biodegradable plastic in which the degradation 'results from the action of microorganisms found in nature such as bacteria, fungi and' - algae. A degradable plastic is a plastic designed to undergo a significant change in its chemical structure under specific environmental conditions, resulting in loss of some properties that can be measured by standard test methods appropriate for plastics and the application in a period of time that determines its classification. Based on the additional components present in the composition and the dimensions of the processed object of said biodegradable material, the period of time required for the degradation will vary and can also be controlled when desired. Generally, the period of time for biodegradation should be significantly shorter than the period of time required for the degradation of objects made of conventional plastic materials having the same dimensions such as, for example, polyethylene, which has been designed to last as long as possible. For example, cellulose and Kraft paper is biodegradable in the following 83 days in a compost environment. Our formulation is biodegradable in a shorter period of time and passes the tests required by ASTM 6400 D99, which requires that plastics susceptible to compost must be biodegradable within less than 180 days. Articles made from PE do not degrade under conditions' - - normal composting and an article based on PLA is degraded in a compost environment in weeks (approximately 6 to 8 weeks). A biodegradable composition according to the present invention comprises between 40% by weight and 85% by weight of poly (lactic acid) polymer, between 10% by weight and 40% by weight of poly (e caprolactone) polymer and between 5 and 10% by weight of mineral particles comprising magnesium silicate, each based on the total weight of the biodegradable composition. A composition according to the present invention can be obtained by mixing or combining the respective constituents of poly (lactic acid) and poly (e caprolactone) together. This can be carried out according to any method known to one skilled in the art. For example, the poly (lactic acid) polymer and the poly (e-caprolactone) polymer can be mixed in pure form, for example they can be combined by means of mixing on a mill roll and can be heated to a selected temperature of according to the general knowledge of the art in such a way that at least one of the components mentioned above is founded partially or essentially completely. Poly (lactic acid) and poly (e caprolactone) can also be mixed in a solvent and at a temperature selected in accordance with general knowledge in the art so that at least one of the components mentioned in the above is partially or essentially completely dissolved. The poly (lactic acid) can be represented by the following structural formula: wherein n, for example, can be an integer between 10 and 250. Poly (lactic acid) can be prepared according to any method known in the state of the art. For example, poly (lactic acid) can be prepared from lactic acid or from one or more of D-lactide (ie, dilactone or a cyclic dimer of D-lactic acid), L-lactide (ie, a dilactone or a cyclic dimer of L-lactic acid), meso D, L-lactide (ie, a cyclic dimer of D and L-lactic acid), a racemic D, L-lactide (the racemic D, L-lactide comprises a 1/1 mixture of lactide D and L). The poly (e caprolactone) can be represented by the following structural formula: - HHHHHO -CI-cI-cI-cI-cI-cI! -o HHHHH m Where m for example, can be an integer between 10 and 150. Poly (e caprolactone) can be prepared according to any method known in the art. state of the art. For example, poly (e-caprolactone) can be prepared by ring-opening polymerization of e-caprolactone monomer with alcohol initiators. According to another approach, a composition according to the present invention can be obtained by mixing the respective amounts of polymer precursors of poly (lactic acid) and poly (e caprolactone) polymer or respective amounts of poly (acid) polymer. lactic) and poly (e caprolactone) polymer precursors with or without a solvent and subjecting the resulting mixture to a polymerization reaction. The poly (lactic acid) polymer precursors are, for example lactic acid, cyclic or linear lactic acid oligomers resulting from condensation reactions of two to fifty lactic acid units such as, for example, the aforementioned lactides and can have any esteromeric configuration. The compositions' - - made from other poly (lactic acid) polymer precursors and poly (e caprolactone) polymer precursors are also used according to the general knowledge of a person skilled in the art. In particular, a biodegradable composition according to the present invention can comprise between 40 and 60% by weight of poly (lactic acid) and between 20 and 40% by weight of poly (e caprolactone) or 70 and 85% by weight of poly (lactic acid) and between 10 and 25% by weight of poly (e caprolactone) and especially between 45 and 55% by weight of poly (lactic acid) and between 25 and 35% by weight of poly (e caprolactone) or 72 and 80% by weight of poly (lactic acid) and between 15 and 20% by weight of poly (e caprolactone), each based on the total weight of the biodegradable composition. A biodegradable polymer according to the present invention also comprises between 0 and 10% by weight, preferably between 5% and 10% by weight, more preferably between 6% and 9% by weight of mineral particles, each in Based on the total weight of the biodegradable composition, the mineral particles comprise magnesium silicate. Examples of such minerals are silicates, such as, for example, montmorillonite. The incorporation of minerals has been found to change the structure of the polymer chain and make it suitable for processing and for various necessary physical properties. for the application such as heat resistance, for example, together with improved flexibility and ductility. For example, the mineral particles can have a size of 0.5 to 2.0 μm, more preferably 0.7 to 1.5 μm. Further, during the preparation of a biodegradable polymer according to the present invention an organic peroxide can be added to the reaction mixture in an amount of less than 5% by weight based on the total weight of the final biodegradable polymer composition. Examples of organic peroxides which can be used to prepare a composition according to the present invention are, for example, diacetyl peroxide, cumyl hydroperoxide and dibenzoyl peroxide. Also • other organic peroxides known to a person skilled in the art can be used. The organic peroxides serve as radical initiating molecules by initiating a polymerization and helping to provide connections, in particular covalent bonds between the components present in a composition according to the present invention. Preferably less than 4% of an organic peroxide is added to the reaction mixture, more preferably less than 2%, more preferably approximately 0.1% to 2% of an organic peroxide each based on the total weight of the peroxide. the composition' - final biodegradable., to produce the biodegradable polymer composition according to the present invention. A biodegradable polymer composition may further comprise up to 5% of a monoester, more preferably between 0.1 and 4% by weight of a monoester, based on the total weight of the biodegradable composition. The monoester can be a carboxylic acid, a sulphonic acid or a phosphoric acid having, for example, between 2 and 20 carbon atoms and comprising aliphatic structural units (having branched or linear chains) or aromatic. In particular, the monoester can be a monoester of a compound comprising at least two carboxyl groups or for example it can be selected from the group consisting of adipic acid and lactic acid. In particular, an addition of a monoester may be useful when formulating formulations for injection molding. Additionally, a biodegradable polymer composition of the present invention may comprise one or more plasticizers. A plasticizer, as used in a composition according to the present invention as well as the degradation products resulting therefrom, is preferably associated essentially with environmental risks or only very small, so that, upon degradation of a composition of the present invention, the respective site where the degradation is carried out will essentially not be contaminated. The plasticizers for use in a composition according to the present invention can therefore be, for example, naturally occurring compounds. Examples of plasticizers are, for example, organic citrate esters as described in US Pat. Nos. 5, 556, 905, which are incorporated by reference. A biodegradable polymer composition according to the present invention can also comprise between 0 and 5% by weight of copolyester polymer with adipic acid, preferably between 0.1 and 4.5% by weight of copolyester polymer with adipic acid, more preferably between 1 and and 4% by weight of copolyester polymer with adipic acid, each based on the total weight of the biodegradable composition. Depending on the specific applications desired, a biodegradable polymer composition of the present invention may also comprise additives or additional components well known in the art such as, for example, natural coloring agents, additional polymeric compounds, cellulose, and the like. A biodegradable polymer composition of ' According to the present invention, it can be used for various applications and should not be limited to the applications described in an exemplary manner. For example, applications are also possible in the medical field such as, for example, for sutures and drug delivery matrices or in the printing industry. A composition of the present invention can be used for the production of various articles such as, for example, molded articles or extruded articles. In particular, a composition according to the present invention can be used to prepare coatings and films, in particular extrusion coatings and extrusion films. As should be clear, a "molded article" (or "extruded article") can also be part of another object such as, for example, an insert in a container or a knife blade or the insert in a fork, in a handle correspondent. A coating or film according to the present invention comprises between 40 and 85% by weight of poly (lactic acid) polymer and between 10 and 40% by weight of poly (caprolactone) polymer each based on the weight total biodegradable composition. A coating formulation which can be applied, for example, according to the extrusion coating process can comprise 70 and 85% in weight of poly (lactic acid) and between 10 and 25% by weight of poly (e caprolactone) and preferably between 72 and 80% by weight of poly (lactic acid) and between 15 and 20% by weight of poly (e caprolactone) , each based on the total weight of the biodegradable composition. In addition, a coating formulation may comprise less than 2% organic peroxide, preferably between 0.1% and 1.8% organic peroxide and more preferably between 0.5% and 1.5% organic peroxide, each based on the total weight of the composition biodegradable. As indicated in detail in the foregoing, the composition for the preparation of such coatings may comprise, in addition to the components mentioned above, mineral particles comprising magnesium silicate, one or more organic peroxides, one or more monoesters, and one or more plasticizers. Based on the specific application, additional additives or natural coloring agents can be added to a composition according to the present invention. A coating formulation according to the present invention can be applied to any coating application method of the state of the art, in particular by extrusion coating application methods of the state of the art. An elaborated coating of a composition according to the present invention can have a thickness, for example between 0.25" and 30.0 μm, and preferably between 0.5 and 80.00 μm). A base coating in a composition according to the present invention can be applied essentially on any desired carrier material such as, for example, paper, plastics, metals, wood and composite materials comprising at least one of the carrier materials mentioned above , etc. Where appropriate, a coating comprising a composition according to the present invention may be applied on one or more intermediate layers present on a carrier material or may be provided with additional topcoats or coatings. An application of a composition according to the present invention on a biodegradable carrier, such as for example paper, provides the advantage that both the carrier and the coating can degrade when exposed to water, light, soil bacteria . In particular when the carrier is paper, the paper material can be sent to a pulping process again without the presence of essentially non-biodegradable material and therefore interfering with the plastic or wax coatings. For example, for utensils in food services, plates, glasses, packaging, in particular ice cream packaging, 'cardboard boxes, paper trays' of one or other of the carrier materials mentioned above can be coated with a coating, in particular an extrusion coating comprising a composition according to the present invention. When preparing a formulation for the preparation of processed films, for example by film extrusion blow-molding processes, a composition according to the present invention can be used which comprises, for example, between 40% and 60% by weight of poly (lactic acid) polymer, less than 5% by weight of copolyester polymer with adipic acid, between 20% and 40% by weight of poly (e caprolactone), between 5% and 10% by weight of mineral particles comprising at least magnesium silicate, less than 5% by weight of organic peroxide and less than 10% by weight of plasticizer, preferably between 45% and 55% by weight of poly (lactic acid) polymer, between 0.1 and 4.5% by weight weight of copolyester polymer with adipic acid, between 22% and 35% by weight of poly (e caprolactone), between 6% and 9% by weight of mineral particles comprising magnesium silicate between 0.1 and 4.5% by weight of organic peroxide and between 0.1 and 8% by weight of plastic sing, most preferably between 47% and 52% by weight of poly (lactic acid) polymer, between 1 and 4% by weight of copolyester polymer with adipic acid, between 25% and 30% by weight of poly (e) caprolactone), 1 between 7% and 8% by weight of mineral particles comprising magnesium silicate between 1 and 4% by weight of organic peroxide and between 0.5 and 6% by weight of plasticizer, each based on the total weight of the biodegradable composition. As indicated in detail in the foregoing, the composition for the preparation of such films may comprise, in addition to the components mentioned above, also one or more monoesters and, depending on the specific application, additional additives or coloring agents. The term "film" as used in the present invention, comprises both self-supporting films as well as non-self-supporting films. A film according to the present invention can have a thickness, for example between 10 and 55 μm, and preferably between 20 and 35 μm. A film based on a composition according to the present invention can be applied essentially on any desired carrier material such as, for example, paper, plastics, metals, wood and composite materials comprising at least one of the carrier materials mentioned above , etc. Where appropriate, a coating comprising a composition according to the present invention can be applied to one or more intermediate layers present on the carrier material and can be provided with layers or additional coatings or coverings. The articles of the present invention produced based on the film formulation, such as, for example, a blown film extrusion formulation or a flexible film formulation are, for example, bag films such as garbage bags as well as bags for grocery products, or films for sealing of containers as well as films for an application in articles for the service of food, plates, glasses, packaging, in particular ice cream packaging, cardboard boxes, trays made of paper or one or the other of the carrier materials mentioned above. In addition, the present invention provides a method for producing an article comprising a biodegradable composition, the method comprising the steps of providing a biodegradable composition comprising between 40 and 85% by weight of poly (lactic acid) and between 10 and 40% by weight. weight of poly (e caprolactone), each based on the total weight of the biodegradable composition; and preparing a film or coating from said composition and optionally applying the film or coating onto an article comprising a material that is selected from the group consisting of paper, plastics, wood or composite materials comprising at least one of the materials mentioned before.

Methods for preparing coatings and films such as, for example, application and extrusion coating of film by blowing or articles such as, for example, injection molding, profile extrusion and thermoforming extrusion are methods known to a person skilled in the art. and are described, for example, by ASTM; injection molding - the process for forming a material by forcing it, in fluid state and under pressure, through a sliding system (sprue, slide, gate) into the cavity of a closed mold; extrusion - a process in which a heated or unheated plastic is driven through a forming hole (a die) into a conformation that is formed continuously, as in a film, sheet, rod or pipe; blow molding - a manufacturing method in which a heated parison is driven in conformation of a mold cavity by the pressure of the internal cavity; shaping - a method in which the shape of the plastic pieces such as sheets, rods or tubes is changed to the desired configuration; thermoplastic - a plastic that can be softened - repeatedly by heating and can be hardened by cooling through a characteristic temperature range of the plastic, and where the softened state ' it can be formed by flow in articles by molding or extrusion (ASTM D 883-00).

DESCRIPTION OF CURRENTLY PREFERRED MODALITIES The present invention is now described in detail on the basis of the following non-limiting examples which are provided solely by way of an example. Example 1 Extrusion coating formulation An extrusion coating formulation is prepared which comprises 75 to 90% by weight of poly (lactic acid), 10 to 25% by weight of poly (e caprolactone) (trade name TONE of DOW) material), 0.25 to 1% by weight of 2,5-dimethyl-2,5-di (terbutylperoxy) hexane. The poly (lactic acid) and the poly (e caprolactone) are mixed by means of a double screw compound processor at a temperature of about 160 ° C for 2 to 10 minutes. Organic peroxide is then added in portions to the reaction mixture for a few minutes. The resulting mixture is further subjected to a combination of the resulting resin having a grain size of 5 to 10 mm and filled into the extrusion coating device, heated and coated, on a paper. This coating has a thickness of 10 μm to 35 μm.

EXAMPLE 2 Film extrusion formulation by blowing A film extrusion formulation is prepared by blowing which comprises: 60% by weight of poly (lactic acid) 10% by weight (copolyester polymer with adipic acid) 10% by weight of (poly e caprolactone) 7% by weight of magnesium silicate 1% by weight of 2,5-dimethyl-2, 5-di (tert-butyl peroxy) exano 12% by weight of tributyl citrate The compounds mentioned in the foregoing are mix by extrusion. The resulting mixture is applied as a filler in a blown film extrusion device at a temperature lower than 210 ° C and a self-sustaining film having a thickness between 15 μm and 55 μm is obtained, which can be used for garbage bags or for groceries. Numerous modifications and variations of the present invention are possible based on the above teachings. Therefore, it should be understood that - within the scope of the appended claims, the invention can be practiced otherwise than specifically described herein.

Claims

CLAIMS 1. Biodegradable composition comprising: between 40 and 85% by weight of poly (lactic acid), between 10 and 40% by weight of poly (e caprolactone) and 5 and 10% by weight of magnesium silicate, each in based on the total weight of the biodegradable composition.
2. Biodegradable polymer composition as described in claim 1, the composition comprises at least two of the elements that are selected from the group consisting of magnesium and silicon.
3. Biodegradable polymer composition as described in claim 1, to which has been added, during its preparation, less than 5% of an organic peroxide, based on the total weight of the final biodegradable composition.
4. Biodegradable polymer composition as described in claim 3, composition to which less than 2% of an organic peroxide has been added during its preparation, based on the total weight of the final biodegradable composition.
5. Biodegradable composition as described in claim 4, composition to which less than 0.1 to 1.8% of an organic peroxide has been added during its preparation, based on the total weight of the biodegradable composition. - - •
6. Biodegradable polymer composition as described in claim 3, wherein the organic peroxide is selected from the group consisting of diacetyl peroxide, cumyl hydroperoxide, dibenzoyl peroxide, 2,5-dithnetyl-2,5-dihydroxybenzoate. (terbutylperoxy) hexane or a mixture thereof.
7. Biodegradable polymer composition as described in claim 1, the composition further comprises the copolyester polymer with adipic acid in an amount of less than 5% by weight based on the total weight of the composition.
8. A biodegradable polymer composition as described in claim 7, to which less than 5% of an organic peroxide has been added during its preparation, based on the total weight of the final biodegradable composition.
9. A biodegradable polymer composition as described in claim 7, to which less than 2% of an organic peroxide has been added during its preparation, based on the total weight of the final biodegradable composition.
10. Biodegradable polymer composition as described in claim 7, composition to which has been added during its preparation less than 0.1 to 1.8% of an organic peroxide based on the total weight of the final biodegradable composition.
11. Film or coating, comprising a biodegradable composition, the biodegradable composition comprises: between 40 and 85% by weight of poly (lactic acid), between 10 and 40% by weight of poly (e caprolactone) and 5 and 10% by weight weight of magnesium silicate, each based on the total weight of the biodegradable composition.
12. Film or coating as described in claim 11, the film or coating is selected from the group consisting of coatings or films on an article comprising a material that is selected from the group consisting of paper, plastics, wood or composite materials comprising at least one of the materials mentioned above, bag films, films for sealing containers.
13. Film or coating as described in claim 11, composition to which has been added, during its preparation, less than 5% of an organic peroxide, based on the total weight of the final biodegradable composition. 1 .
Film or coating as described in claim 11, composition to which has been added, during its preparation, less than 2% of an organic peroxide, based on the total weight of the final biodegradable composition.
15. Film or coating as described in claim 11, composition to which less than 0.1 to 1.8% of an organic peroxide has been added during its preparation, based on the total weight of the final biodegradable composition.
16. Film or coating as described in claim 15, wherein the organic peroxide is selected from the group consisting of diacetyl peroxide, cumyl hydroperoxide and dibenzoyl peroxide.
17. Film or coating as described in claim 11, wherein the composition further comprises the copolyester polymer with adipic acid in an amount of less than 5% by weight based on the total weight of the composition.
18. Film or coating as described in claim 11, the composition further comprises at least two of the elements that are selected from the group consisting of magnesium, aluminum and silicon.
19. Film or coating as described in claim 11, the composition further comprises plasticizers.
20. Film or coating as described in claim 13, the composition further comprises up to 5% of a monoester, based on the total weight of the biodegradable composition.
21. Molded or shaped article comprising a biodegradable composition, biodegradable composition which comprises between 40 and 85% by weight of poly (lactic acid), between 10 and 40% by weight of poly (e caprolactone) and between 5 and 10% by weight of magnesium silicate, each based on the total weight of the biodegradable composition.
22. Molded or formed article, as described in claim 21, the molded or formed article is selected from the group consisting of utensils, accessories for serving on a table, forks, spoons, knives, chopsticks, containers, glasses, products of foam material and receptacles.
23. Article comprising an elaborated section of a material that is selected from the group consisting of paper, plastics, wood or composite materials comprising at least one of the materials mentioned in the foregoing, the section is coated with a coating or a The film, coating or film comprises between 40 and 85% by weight of poly (lactic acid), between 10 and 40% by weight of poly (e caprolactone) and between 5 and 10% by weight of magnesium silicate, each in based on the total weight of the biodegradable composition.
24. Article as defined in claim 25, the article is material for the service of food, plates, rates, packaging, cardboard boxes and trays.
25 Method for producing an article comprising a biodegradable composition, comprising the steps of: providing a biodegradable composition, the composition comprising: between 40 and 85% by weight of poly (lactic acid), between 10 and 40% by weight of poly ( e caprolactone) and between 5 and 10% by weight of mineral particles, comprising magnesium silicate, each based on the total weight of the biodegradable composition; and preparing a film or coating from the composition and optionally applying the film or coating onto an article comprising a material that is selected from the group consisting of paper, plastics, wood or composite materials comprising at least one of the materials mentioned in the above.
26. Method for producing a biodegradable composition, comprising the steps of: (i) providing a composition comprising between 40 and 85% by weight of poly (lactic acid) and between 10 and 40% by weight of poly (e caprolactone) and between 5 and 10% by weight of mineral particles comprising magnesium silicate, each based on the total weight of the biodegradable composition, which method comprises the following steps: (ii) mixing the constituents of part (i); (iii) heating the mixture to a temperature of 160 ° C to 210 ° C; and (iv) shaping the resulting mixture to obtain a desired shape.