MXPA96006240A - Method for recycling polymeric materials and laminated article prepared with such met - Google Patents

Abstract

An extruded sheet is presented as well as a method for forming said sheet from recycled polymer material having a hygroscopic component, a PVC component or mixtures or compositions thereof, and / or a crosslinked polymer component. The recycled polymer material is introduced into an extruder to form a melt and the melt is extruded through a slot die to form the sheet. Also included is an extruded foam sheet incorporating a recycled material having a hygroscopic component in an amount of approximately 23% by weight, a component of PVC and / or PVDC or mixtures or combinations thereof, and / or a component reticulated, as well as the method of recycling the material by extrusion of espu

Description

METHOD FOR RECYCLING POLYMERIC MATERIALS AND LAMINATED ARTICLE PREPARED WITH SUCH METHOD FIELD OF THE INVENTION The present invention relates to a method by which polymeric waste materials are recycled in a laminated material, and to the laminated article formed by said method. More particularly, the invention relates to a method for recycling a material having a hygroscopic component, a component of PVC or PVDC or mixtures thereof and / or a cross-linked component, into the laminated article of the invention. BACKGROUND OF THE INVENTION Large amounts of polymeric waste materials are generated in the manufacture of polymeric films and other products containing polymers. A potential alternative to the disposal of waste in landfills is the recycling of waste in an economically and environmentally feasible way. Even though the recycling approach has been successful in some cases, there are many polymeric materials that have been difficult to re fl ect. The palm waste often contains more than a single polymeric component. Recycling procedures applicable to single component materials, for example polyesters such as polyethylene terphthalate, may not be feasible with waste containing other types of polymeric components. For example, PET can be recycled by glycolysis or by other methods in its constituent portions which can react again in the primary reactions that produce the final polymer. Such procedures, however, are difficult or impracticable in waste recycling of multiple polymer components, examples of which include flexible multilayer films and laminates useful in packaging applications. These films or laminates may contain other polymers such as for example alpha-olefin copolymer, polyvinyl chloride (PVC), polyvinylidene (PVDC) ethylene vinyl acetate (EVA), ethylene vinyl alcohol (EVOH), or a paliamide such as nail n. Attempts have been made to develop other methods for the recycling of these types of films, but with limited success. In one method, the waste is mixed with a virgin material not recycled in a trusser and then subjected to extrusion in the form of a mixed polymer melt. Certain materials, however, are difficult to process and recycle in this way. For example, it is difficult to recycle films containing a hygroscopic material such as EVOH or nylon. The amount of such recycled material in the mixture can be limited and the mixture requires a high proportion by weight of virgin material not recycled or achieve a successful extrusion. Another material that is difficult to recycle is the material that contains a crosslinked component or a gel. Flexible heat-shrinkable polymer films are typically subjected to radiation during manufacture to induce crosslinking. The crosslinked component can be difficult to melt and / or mix and therefore difficult to recycle. Other materials difficult to recycle with conventional means are materials that, like materials containing PVP or PDVC, have components where degradation can cause harmful gases. Materials that contain PVC or PVDC tend to release HCL gas upon digestion. Accordingly, it is desirable to provide a method for recycling polymeric materials and a polymeric sheet including them, which can successfully incorporate these difficult to recycle materials. SUMMARY OF THE INVENTION The present invention, in one aspect, is directed toward a step to recycle a polymeric material comprising a hygroscopic polymer component for extruding a non-foamed sheet and also the sheet formed by this method. The method comprises the steps of: introducing the polymeric material into an extruder; forming a melt in the extruder where the foaming agent is substantially absent; and extruding the fusion in the form of a sheet. The invention also focuses on a method for recycling a polymeric material comprising a hygroscopic polymer component for extruding a foam sheet, and the foam sheet formed in this manner. The method comprises the steps of: introducing the polymeric material into an extruder; forming a melt in the extruder comprising at least about 23 * / "by weight of the hygroscopic component; introducing a foaming agent in the melt; and extruding the melt into foam in the form of a foam sheet. The foam sheet therefore comprises at least about 23 * / "by weight of the hygroscopic component. The invention is further directed to a method for recycling a polymeric material comprising a component selected from the group consisting of PVC, PVDC, and mixtures thereof, and also focusing on the laminated article formed in this manner. It comprises the steps of: supplying a neutralizing compound for mixing with the waste or for entering the melt; introduce the polymeric material in an extruder; form a melt in the extruder; introducing a foaming agent in the melt; and extruding the melt into foam in the form of a foam sheet. In another aspect, the invention focuses on a method for recycling a polymeric material comprising a crosslinked polymeric component and also focusing on the sheet formed in this manner. The method comprises the steps of: introducing the polymeric material into an extruder; it will form a fusion in the extruder; and extruding the fusion in the form of a sheet. Optionally, the method may further comprise the step of introducing a foaming agent into the melt to extrude a sheet of foam comprising the recycled crosslinked polymer component. In another embodiment, the invention focuses on a method for recycling a polymeric material that has a hygroscopic polymer component and a crosslinked polymer component, and also focuses on the sheet formed in this manner. The method comprises the steps of: introducing the polymeric material into an extruder; form a melt in the extruder; and extruding the fusion in the form of a sheet. The method may further comprise the step of introducing a foaming agent into the melt to extrude a sheet of foam comprising the crosslinked and hygroscopic polymeric components r & The method and laminate article of the invention overcome the aforementioned disadvantages. Since the recycled scrap of the invention is frequently generated in significant volumes in manufacturing operations, the invention can produce significant cost savings. The invention allows the recycling of polymeric waste materials from other forms difficult to recycle and which are expensive to dispose of. The sheet of the present invention is useful in many applications including, without limitation, its use as a backing material for waterproofing materials in construction or its use as a substrate or monolayers incorporated in a laminated product. These and other aspects, objects, features and advantages of the present invention will be more clearly understood and understood from the following detailed description of the preferred embodiments and the appended claims. DEFINITIONS As used herein, the following abbreviations and terms have the meanings mentioned below: "Polymers", "polymeric", and the like, unless specifically defined or limited in other ways, generally include homopolymers, copolymers and terpolymers, as well as mixtures and modifies ions thereof. "Laminated material" or "sheet" as used herein refers to an extruded fabric from a matrix groove, for example a rectangular die groove, in the form of a sheet, or a tubular foam film extruded through a round die which, after extrusion, is cut longitudinally in the form of a sheet. When referring herein to the thickness of sheet material, the term "thickness" refers to 63 includes the average transverse thickness. "Hygroscopic" indicates the tendency of the specific material to absorb water, such as, for example, from moisture in the air. EVA: refers to copolymers of ethylene and vinyl acetate. EEiA: refers to copolymers of ethylene and bilat acrylate. EAA: refers to copolymers of ethylene and acrylic acid. PVDC: refers to copolymers and terpolymers of polyvinylidene chloride. These include copolymers of vinyl idene chloride / vinyl chloride (VDC / VC), copolymers of vinylidene chloride and acrylate esters such as methacrylate (VDC / MA) and acrylic acid (VDC / MMA), and copal i eras of inyl ideno / acri lonitrile chloride. Ethylene alpha-olefin copolymers: generally refers to a copolymer of ethylene with one or more comanomers selected from C3 alpha olefins at about CIO. They include: heterogeneous materials such as linear low density polyethylene (LLDPE), very low density polyethylene (VLDPE), and ultra low density polyethylene (ULDPE); and homogeneous copolymers such as for example examples of ethylene-catalyzed polymers such as EXACT (MR) materials supplied by Exxon, and TAFMER (MR) materials supplied by Mitsui Petrochemical Corporation. These materials generally include capyroles of ethylene with 1 or more comonomers selected from fa-olefins Cl to CIO such as, for example, butene-1, (ie, 1-butene), hexene-1, octene-1, etc., wherein the molecules of the capolimers comprise long chains with relatively few branches of side chains or cross-linked structures. This molecular structure must be contrasted with conventional low or medium density polyethylene which are more highly branched than their respective counterparts. LLDPE, as used herein, has a density in the range of about 0.91 g / cc to about 0.94 g / cc. Other ei lens / alpha-olefin copolymers, such as the homogeneous long chain branched copolymers of leno / fa-olefins available from Dow Chemical Company, known as AFFINITY or ENGABE (MR) resins, are also included as another type of ethylene alpha-olefin copolymer useful in the present invention. HDPE: high density polyethylene LDPE: low density polyethylene EVOH: ethylene vinyl alcohol EVAL: ei lenvini hydrolyzed lacetato PP: polypropylene Link: refers, in relation to a layer in a multilayer film or to a laminated product made that the layer is provided as an adhesive layer to join the two adjacent layers. DETAILED DESCRIPTION OF THE INVENTION The recycled polymeric materials of the present invention include polymeric materials having a hygroscopic polymer component. These include multi-layer or monolayer films having one or more layers containing EVOH, nylon, both or similar materials. The method and sheet of the present invention can usefully incorporate recycled materials comprising the hygroscopic polymeric material by means of conventional expression wherein the foaming agent is substantially absent from the extruder melt. In addition, the foam extrusion method presented hereinabove, the amount of hygroscopic polymeric material comprises at least approximately 23% by weight of the recycled material. Surprisingly, polymeric hygroscopic waste can be extruded without blends into additional polymer material containing non-hygroscopic products, although it can be included if desired. Accordingly, the invention includes recyclable material consisting essentially of polymeric material comprising a hygroscopic component, but which may include adjuvants and additives which are described below. The invention also includes polymeric materials having a crosslinked component. Examples of crosslinked polymeric materials are well known and include those in which crosslinking is induced by chemical initiators and also those in which crosslinking is induced by radiation. Flexible shrink films, including multi-layered oriented films employed in various packaging applications are typically converted to an irradiation step in manufacturing to increase the mechanical properties by polymeric crosslinking in one or more layers. The waste is generated during the manufacturing process and this waste containing a crosslinked component can be recycled in accordance with the present invention. A preferred amount of cross-linked component recycled by weight of the polymeric material is within the range of approximately 10 '/. and approximately 'A gel as determined by ASTM test D-2765-90. An especially preferred amount of crosslinked component is from about 15 to about 45 '/ gel. The present invention also includes the recycling of polymeric materials containing canbinac ions, or mixtures or the like of any of the recycled materials described above, either together and / or with other polymeric materials. Such other polymeric materials include, without limitation, leno / alf -slef inas such as LDPE, LLDPE, VLDPE, ULDPE, HDPE, polypropylene and EPC, PET and PE, polyamides, PVC, PVDC, EVOH, vinyl ethylene esters, such as EVA, and ethylene esters such as EBA. Representative examples of recyclable polymeric waste articles include used consumer goods, such as plastic milk bottles, HDPE water bottles, and articles such as tires, which contain other types of crosslinked polymeric materials, only for name some. Any of these combined ions of materials can be extruded into the laminated article of the present invention. In the extrusion method of the present invention, the waste material recycled as described above is first compressed and / or crushed into pellets, flakes, powder or pieces. The crushed waste is then fed to an extruder such as a melt screw extruder. The waste can be fed into the extruder by means of a hopper or by a compressed feeder, either directly in line from the crushing device or alternatively it can be batch fed into the hopper. If desired, the waste can be mixed in the hopper or the extruder with a virgin or non-recycled polymer material. The extruder may comprise either a single-stage extruder or a multi-stage extruder. In a preferred embodiment, the waste is fed to the primary melting screw extruder of a 2-stage extruder. The primary extruder works to melt the thermoplastic material comprising the recycled waste into a melting or "melting" mass, to uniformly mix and disperse the additives in the melt, to increase the bulk density of the melt and to remove trapped air of the merger. A typical extruder comprises, in sequential order, a feeding zone for the entry of the material near the beginning of the torinlla, a melting zone that fuses, mixes and compresses the molten material, and a measuring zone where additives or additional materials can be introduced. . In a preferred embodiment, a foaming agent (also called "dispersing agent") such as carbon dioxide, for example, is introduced into the extruder and preferably injected into the melt near the end of the primary extruder. In the case of a volatile foam forming agent under the conditions of pressure and temperature in the extruder, the selection of the foaming agent must be made in such a way that it can decompose at the temperature at which the extrusion will be carried out or underneath. of said temperature for the specific recycled polymer waste material for gas formation. Examples of foam forming agents that decompose at specific temperatures to release gases can be found in the North American Patent Na. 4,181780, published on January 1, 1980, Brenner et al., Which is incorporated herein by reference. Foaming agents useful in the invention are also described in Handbook of Palymeric Foams and Foam Technology, Chapter 17, "Blowing Agents for Polymer Foams". , FA Shutov (1991). The amount of chemical foaming agent that is employed is typically within the range of about 0.25 to about 5 parts per 100 by weight based on the price of materials and noise. Useful foam forming agents also include physical foaming agents well known in the art. Examples of these include butane, pentane, hexane, heptane, carbon dioxide, dichlorodifluoromethane, and nitrogen and the like. The invention also includes foam extrusion wherein the foaming agent is introduced into the melt by the generation of a foam gas as a product of a chemical reaction carried out in the extruder, a process known as "reactive extrusion". In this method, the waste is introduced into the extruder together with other materials that will react to produce products or reaction products gasease. For example, a waste of ethylene / alpha-olefin, for example LLFPE, is introduced into the extruder with an acidic polymer such as EAA and a base material such as a carbonate or mineral bicarbonate. A neutralization reaction is carried out in the extruder, under pressure. An example reaction is: R-COOH + NaHC03 R-C00-Na + + C02 + H20 The reaction of a metal salt and an acidic copal can therefore produce a reaction product which chemically incorporates a metal ion into the resin, otherwise known generically as an "ionomer", while generating a gas. Appropriate stereometric combinations depend on the choice of acid and gas components and processing variables, which is within the knowledge of a person with some technique management. The above reaction produces carbon dioxide in the product mixture, which, upon extrusion and due to the drop in pressure, is released in the form of a foaming agent in the extruded product. the reactive extrusion therefore provides both a process for extruding foam from polymeric waste and a means for conveniently introducing a foaming agent into the melt. Obviously, an additional foaming agent can be provided if desired or if necessary. Without being limited to any theory, it seems that the ionomer of the neutralization reaction provides the additional advantage of moistening and joining the debris together while forming gases to fill any void present in the fusion and which causes the moment of expansion in the lip from the matrix a foaming effect. When extruding foam is practiced, it may also be desirable to introduce a nucleating agent into the extruder. The nuking agent which functions to provide sites for the formation of bubbles, can be introduced or measured in the same feed stream as the waste or separately through an inlet hole downstream of the hopper. The plorant agent helps produce a foam that has small, uniform cells. Typically, the nucleating agents are citric acid, sodium bicarbonate and magnesium. Various other additives can be introduced in the extruder or in the materials fed to the extruder. the additives may include fillers or pigments such as, for example, carbon black, lubricants and thermop) virgin ast as previously mentioned, processing oils, and meri-d '> the same. These or other additives can be used to improve the physical properties, the appearance, the chemical properties or the processability of the compositions to form foams. Certain additives or stabilizers may be desired when recycling materials containing PVC and / or PVDC, mixtures thereof or any material which, when degraded, can emit potentially harmful byproducts such as, for example, HCl gas. For example, when PVC and / or PVDC is recycled, a neutralizing compound such as a metal carbonate or bicarbonate can be added to the waste or melt to neutralize HCl. The produced beep byproducts can also react with an additive such as a foam forming agent to provide acceptable foam gases as a reaction product. This can decrease or eliminate the need to add an additional mineral acid component such as carbonate or metallic bicarbonate during foam extrusion. The relative amounts of additives desired, and the technique of their incorporation into the blend composition or into the extruder, can easily be determined for an intended application by a person with certain connotations in the art. The merger from the e? < The primary russia then enters the extruder secuandapa where it cools before undergoing trusion. The enfolding profile of the secondary Russian can be applied as desired to use the line speed while maintaining the proper temperature and the proper melt viscosity to form foams from the melt. The extruder configuration can be modified or increased as desired for a specific application. For example, a screen changer can be placed in the connection tube between the primary and secondary extrusers to remove foreign particles that could potentially cover the matrix. However, this is not preferred when referring to cross-linked lenses that may exhibit a tendency to accumulate in the screen changer and cause plugging. Such modifications are within the capacity of a person with certain knowledge in the field. The melt is then extruded through the die groove in the form of a sheet. If foam extrusion is practiced, the foam ion form of the exuded material occurs in the lips of the matrix to form the foam sheet embodiment of the present invention. As indicated above, parameters such as for example extruder temperature, pressure and compression can be adjusted in a routine manner to produce the desired or optimum extrusion conditions for a particular recycling material or mixture. For example, it may be preferred to extrude a crosslinked splashed material such as polyethylene at a temperature of 176. ¿>° C or more. According to the amount of crosslinking, ie gel content, it increases, the melting of palethylene may become deformable but may not flow freely in the extruder and therefore extrusion may be difficult to perform despite the increase in extrusion pressure. Under these conditions, it may be desirable to add non-reticulated, virgin to recycled palmeric material, and / or resins, plasticizers, lubricants, process aids, and other materials to the extruder to lower the melt viscosity and thereby increase the Fluv capacity or performance.

Under some operating conditions, particles such as for example compacted foam forming agent can be formed in the melt and accumulate in the lips of the matrix. This can cause the formation of undesirable matrix line in the extruded foam sheet. Adjustment of parameters such as for example the extrusion temperature can substantially eliminate the formation of matrix line. Accordingly, a preferred extrusion temperature for a material or mixture of specific recycled materials is the temperature at which the foam sheet is substantially free of matrix lines. The free reactive extrusion temperature of matrix lines for a recycled polymeric material can easily be determined without undue experimentation by a person with certain skill in the art. The foam sheet of the present invention comprises the materials, for example recycled polymeric materials, additives, etc., and in the preferred amounts, in accordance with the above. The foam sheet preferably has a thickness in the range of about .508 mm to 5.08 mm, with a greater degree of preference within the range of about .508 mm to 3.81 m. In these thicknesses, the sheet can be rolled up, which facilitates handling, shipping and storage, thus providing a clear advantage compared to friable materials such as polystyrene. A sheet of foam having an uneven or uneven surface can be formed which in certain applications such as for use in a waterproof laminate for construction can provide a desirable uneven appearance and provide an increased surface area. Alternately, the sheet can be formed with smooth surfaces and appearance. The invention will be further illustrated by the following examples. EXAMPLES In the following examples, the gel content when provided is determined in accordance with the standard test method ASTM D-2765-90, where a weighted sample is extracted into toluene by boiling the contents of twenty-one hours. The non-soluble species that make up the gel component are separated and weighed, to provide the percentage content by weight of gel of the original weighted sample. EXAMPLE 1 Foam extrusion tests were performed on several individual virgin resins: LDPE, HDPE, LLDPE, EVA and nail n. For each test, the resin was combined with the material fed to the extruder with 3 '/ »by weight of Pr imacor (MR) 5981, which is an EAA, and 2V' by weight of sodium bicarbonate. Each extrusion was made with a 1905 cm Brabender extruder equipped with a rectangular slot die 5.08 cm wide. In each test, a foam sheet material of a thickness of 1524 mm was successfully formed. EXAMPLE 2 As in Example 1, a single-layer foam sheet material was prepared, but using waste resin materials in the form of pellets as feed for the extruder. (i) One roll of a waste product film with sequential layer configuration Polypropylene / bond / nylon Thickness (mm) 0.04064 0.01016 0.026416 EVOH / nylon / bond / LLDPE Thickness (mm) 0.02032 0.026416 0.01625 0.06299 (Total thickness - 0.2032 mm), with the nylon components plus EVOH forming a total of 35V "by weight of the film, was pelletized to form a first material in the form of pellets. The pellets were introduced into a 1905 cm Brabender extruder equipped with a 5.08 cm wide rectangular slot, and a foam sheet was successfully formed. (ii) Another roll of heat-shrinkable film with the configuration of sequential layers EVA / LLDPE / EVA / LLDPE / EVA Thickness (mm) 0.00254 0.00381 0.00254 0.00381 0.00254 (Total thickness 0.01524 mm) and crosslinked by means of irradiation of electronic rays to a gel of 35 * / of the gel content by weight was formed into pellets as in example 1 to form a second material in the form of pellets. The extrusion was carried out as in the case of the first material in the form of pellets for the successful extrusion of a foam sheet. Without subjecting to any theory, it is believed that the crosslinked component (35% by weight) and the non-crosslinked component (65 * / 5 by weight) do not form a single-phase, homogeneous system, but that the retic? lads component comprises a phase of different gel distributed within the non-crosslinked material. EXAMPLE 3 A 2-ply tubular film of 0.508 mm thickness was formed by coextruding 2 layers, each layer comprising a mixture of EVA and LLDPE, through a circular matrix. The tubular film was flattened in a ribbon that was irradiated by electronic beam and thus crosslinked to a gel with a content of 45 'by weight. The film was then extrusion coated with a non-irradiated EVA blend layer to form a 3-fold thick film of 0.7112 mm thick with a net gel content of 25 * i by weight. The film was oriented by biaxial stretching to form a shrinkable film of 0.05969 m thickness. The tubular film was formed into pellets and extruded into foams as in Example 2 to form a foam sheet. EXAMPLE 4 A tubular film was produced as in Example 3 except that an additional PVDC copolymer layer was co-sandwiched between the EVA / LLDPE blend layers. The film was formed into pellets and extruded into foam as in Example 2 except with 5% by weight of sodium bicarbonate. A foam sheet material was successfully formed. EXAMPLE 5 A waste composition having the following composition by weight was formed into pellets and mixed: (i) 60VS of the 3-ply film of Example 3; (ii) 20 '/. of the first pelletized material of example 2 (1); and (iii) 20 *? of the second pellet material of Example I (i i). The net weight percentage of the gel content in the mixture was 22V. (15% attributable to (i) and 7% attributable to (iii)). The mixture was fed to a tandem extruder at a rate of 78.246 kg / hour. Once the fusion of the first stage extruder mixture was started, 1134 kg / hours of carbon dioxide were injected under high pressure in the melt. The resulting mixture was fed under pressure to the second stage extruder for further mixing to be extruded through a circular side to form a foam sheet material with a thickness of 1.27 mm and a density of 0.53 g / cc. The test was repeated except that 1.45152 kg / hours of carbon dioxide were injected. A foam sheet was formed with a thickness of 2.54 m and a density of 0.61 g / cc. EXAMPLE 6 The 1.27 mm sheet material of the pla 5 axis was tested to determine its degree of friability and other mechanical properties. Comparison tests were performed on a 6.35 mm thick polyethylene foam material, with and without polyester outer layers. The test for determining friability consisted of an elongation stress test performed in accordance with test method D-412-87 of the ASTM standard using an Instron Model 1000 voltage tester. Co or specified in ASTM D-412-87 , a sample was dissected between 2 gripping elements of the Instron test machine. The machine was then activated to exert an increasing force on the sample. As the sample was stretched (at a rate of 1.27 cm per minute), the change in length was measured and the total length change at break was recorded. The load to break (ie the total force) was also recorded. The tensile strength (TS) was calculated by dividing the load by breaking "F" (kg) between the area of the original section "A" (square meters). Therefore TS = F / A (kg / m2). The percent elongation at break was calculated as follows. 'A of elongation = length change x 100 / original length It was found that the controls (6.35 mm polyethylene foam boards of the prior art) had essentially no elongation at break and were therefore extremely friable. The tear propagation resistance test involved the determination of the strength of a sheet or board of protection to the tearing forces. Two strips of 7.62 c x 22.86 cm from the control polystyrene foam board (one strip with coating layers and one strip without coating layers) were compared with a strip of 7.62 cm? 22.86 cm of 1.27 mm thickness of the laminate material of Example 5. A longitudinal cut of 5.08 cm was used in the middle of one of the ends (7.62 cm) of the strips. The thickness of the strips was measured and the strips were fastened on the Instron machine (Model 1000). The grip elements of the Instron machine are avoided at a distance of 2.54 cm on both sides of the cut.The load placed on anger depends on the materials and the thickness. In the case of the present comparative examples, the crosshead speed was approximately 1.27 cm / minute. Once the Instron machine was activated, a tear of 5.08 cm was propagated from the cut, the peak load was recorded in terms of kilograms and then converted to "specific tear strength" by dividing the peak load by the thickness (mm) of the sample. The results appear in the following table: TABLE Specific Resistance Resistance tear propagation tear (kg / mm) (ki achieved) Polystyrene 10.206 1.6072 of 6.35 mm with coating layers 5.8468 0.8929 irene polyester of 6.35 mm without coating layers Foam from 12.9276 10.1792 Stress waste to elongation breaking to break (kg / m2) < * /.) Polystyrene 67497.6 1 of 6.35 mm with coating layers Polystyrene 36209.65 < 1 of 6.35 mm without coating layers 506232 Foam 25 1.27 mm debris The data shows that the foam waste sheet according to the present invention is less friable, ie it has higher tear resistance properties than tensile strength substantially higher, and it is more extensible than the comparison materials. EXAMPLE 7 Recycled scrap was repaired from the following materials: (a) polymer material as in example 5 (iii) (highly crosslinked), (b) polymer material as in example 3 (moderately cross-linked), and (c) polymer material as in example 2 (I), in the following manner. The waste compositions were pre-ground in the following proportions by weight of materials (a) - (c) and formed into pellets as in example 2: Composition 1: 60% (a) + 20% (b) + 20% (c) Composition 2: 30% (a) + 30% (b) + 40% (c) Composition 3: 40% (a) + 40% (b) + 20% (c) Composition 4: 50% (a ) + 50% (b) Compass ici n 5: 100% ía) Composition 6: 100% (b) For each composition, the material in pellet form was measured in an extruder hopper by means of a volumetric feeder, introduced in a single tappet extruder of 2.54 cm with a length to diameter ratio of 24 and equipped with a 10.16 cm die, and extruded in accordance with the present invention. A 3-roll activator and babinadar shaped the socket assembly. The composition 1 was successfully extruded into a sheet with a thickness of 1.27 mm. Composition 2 was successfully extruded into a sheet of 1.2573 thickness. Composition 3 was successfully excreted in a sheet with a thickness of 1.2446 mm. The composition 4 was extruded in a sheet of this thickness of 0.9652 mm. The composition 5 was successfully extruded into a sheet of 1,143 mm thickness. Composition 6 was successfully extruded in a sheet with a thickness of 0.965 m. EXAMPLE 8 The following waste compositions were premixed in the indicated proportions by weight using the material (a) of Example 7 and formed into pellets as in Example 2: Composi in 7: 100% material (a) Composition 8: 80% of material (a) + 15.6 EAA + 4.4% sodium bicarbonate Composition 9: 95% material (a) + 3.9% EAA + 1.1% sodium bicarbonate Composition 7 was successfully extruded into a sheet with a thickness of 1,524 mm and a density of 0.84 g / cc. The composition 8 was successfully extruded into a foam sheet with a thickness of 1778 mm and a density of 0.44 g / cc. The composition 9 was successfully extruded into a foam sheet with a thickness of 1778 mm and a density of 0.51 g / cc. The sheet and the method of the present invention are useful for recycling polymeric material produced in manufacturing operations and material present in articles after consumption. The blade is useful in many applications. For example the foil, foamed or non-foamed, 50 it can be used as a component sheet in a waterproof laminate for concrete exterior concrete surfaces and the like. The sheet can also be used as a protective packaging material, for example, an insert in such a way that it receives and tightly holds a product inside a box. The sheet can be manufactured, for example by thermoforming into various products such as egg packings. The recycled materials and the thickness of the sheet can be selected or modified as appropriate to suit the intended use. The invention has been described in detail with reference to particular embodiments, but it will be understood that variations or modifications can be made within the spirit, and scope of the present invention.

Claims (1)

1. CLAIMS 1. A method for recycling polymeric material comprising a hygroscopic polymer component, comprising the steps of: introducing a palmeric material into an extruder; forming a melt in the extruder where the foaming agent is substantially absent; and extruding the fusion in the form of a sheet. 2. A method according to claim 1, wherein the hygroscopic component is selected from the group consisting of vinyl alcohol of ethylene, nylon, and mixtures thereof. 3. A method according to claim 2, wherein the hygroscopic component is present in an amount of at least about 23% by weight of the polymeric material. 4. A method according to claim 3, wherein the melt further comprises a polymeric material that has a non-hygroscopic component. 5. A method for recycling a polymeric material comprising a hygroscopic polymer component, comprising the steps of: introducing the polymeric material into an extrinsic material; forming a melt in the extruder comprising at least approximately 23% by weight of the hygroscopic component; introducing a foaming agent in the melt; and extruding the melt in the form of a spherical sheet in foam. 6. A method according to claim 5, wherein the hygroscopic component is selected from the group consisting of vinyl alcohol of ethylene, nylon, and mixtures thereof. 7. A method according to claim 6, wherein the melt further comprises a polymeric material that contains a non-hygroscopic component. 8. A method for recycling a polymeric material consisting essentially of a material having a hygroscopic psi-chemical component in an amount of at least about 23% by weight, comprising the steps of: grinding the polymeric material in a waste feed crushed; introduce the feed of shredded waste into an e-trumper; form a melt in the extruder; and extruding the fusion in the form of a sheet. 9. A method according to claim 8, further comprising the step of introducing a foaming agent into the melt to thereby extrude a foam sheet. 10. A method according to claim 9, wherein e3 hygroscopic component is selected from the group consisting of vinyl alcohol of ethylene, nylon, and mixtures thereof. 11. A method for recycling a polymeric material comprising a crosslinked polymer component, comprising the steps of: introducing a polymeric material into an extruder; it will form a fusion in the extruder; and extruding the fusion in the form of a sheet. 12. In a method according to claim 11, wherein the crosslinked component is present in a weight amount of the polymeric material from about 10% to about 90% gel, in accordance with that determined by the D-test. 2765 of ASTM. 13. A method according to claim 12, wherein the crosslinked camphor is present in a weight amount of the polymer material of approximately 15 to about 45% gel in accordance with that determined by test D-2765 of ASTM. 14. A method according to claim 11, further comprising the step of introducing a foaming agent into the melt and thereby extruding a foam sheet. 15. A method according to claim 14, wherein the crosslinked component is present in a weight amount of the polymeric material from about 10% to about 90% gel in accordance with that determined by ASTM test D-2765. 16. A method according to claim 5, wherein the crosslinked component is present in a weight amount of the polymeric material from about 15 to about 45% gel in accordance with that determined by ASTM test D-2765. 17. A method for recycling the polymeric material having a hygroscopic pallaeric component and a crosslinked polymeric component, comprising the steps of: introducing the polymeric material into an extruder; form a melt in the extruder; and extruding the fusion in the form of a sheet. 18. A method according to claim 17, wherein the hygroscopic component is present in an amount of approximately 10% to about 90% by weight of the polymeric material and the crosslinked component is present in an amount of approximately 10%. to about 90% by weight of the palmeric material. 19. A method according to claim 18, wherein the crosslinked component comprises a weight amount of a polymer material of approximately 15 to about 45% gel in accordance with that determined. for the ASTM D-2765 test. 20. A method acing to claim 17, further comprising the step of introducing a foaming agent into the melt to thereby extrude a foam sheet. 21. A method acing to claim 20, wherein the hygroscopic component is present in an amount of approximately 20 to about 90% by weight of the polymeric material and the crosslinked component is present in an amount of about 10% to about 90% in weight of the polymeric material. 22. A method acing to claim 21, wherein the reticulated component comprises a weight amount of the palmeric material from about 15 to about 45% gel in acance with that determined by ASTM test D2765. 23. A method for recycling a polymeric material comprising a selected component within the group consisting of PVC, PVDC, and mixtures or compositions thereof, comprising the steps of: providing a neutralization compound for mixing with the waste or to enter the merger; introduce the polymeric material in an extruder; form a melt in the extruder; introducing a foaming agent in the melt; and extruding the foam in the melt in the form of a foam sheet. 24. An extruded non-foamed sheet comprising recycled palmeric material which has a hydroscopic component. 25. A sheet acing to claim 24, wherein the hydroscopic component is selected from the group consisting of vinyl alcohol of ethylene, nylon, and mixtures thereof. 26. A sheet acing to claim 25, wherein the hydroscopic component is present in an amount of at least about 23% by weight. 27. A sheet acing to claim 26, wherein the melt further comprises a polymeric material containing a non-hydroscopic component. 28. An extruded foamed sheet comprising a recycled polymeric material having at least approximately 23% by weight of a hydroscopic component. 29. A sheet of compliance with claim 28, wherein the hydroscopic component is selected from the group consisting of vinyl alcohol of ethylene, nylon, and mixtures thereof. 30. A sheet of foam consisting essentially of a recycled polymeric material comprising an igroscopic polymer component in an amount of at least about 23% by weight. 31. An extruded sheet comprising a reticulated crosslinked polymer component. 32. A sheet acing to claim 31, wherein the crosslinked component is present in a weight amount of the foam sheet of from about 10% to about 90% gel in acance with that determined by test D-2765 of ASTM. 3LLT. A sheet acing to claim 32, wherein the crosslinked component is present in a weight amount of the foam sheet from about 15 to about 45% gel in acance with that determined by ASTM test D-2765. 34. A 1Amina acing to claim 31, wherein the sheet is a sheet of foam. 35. A sheet acing to claim 34, wherein the crosslinked component is present in a weight amount of foam sheet of approximately 10% to approximately 90% gel in acance with that determined by test D -2765 from ASTM. 36. A sheet in acance with claim 35, wherein the removed component is present in a weight amount of the foam sheet of about 15% to approximately 45% gel in acance with that determined by the manufacturer. ASTM D-2765 test. Q 37. A sheet of foam comprising a recycled polymeric material having a hygroscopic polymer component and a crosslinked polymer component. 38. A foam sheet acing to claim 37, wherein the hygroscopic component is present in an amount of about 10% to about 90% by weight of the polymeric material and the crosslinked component is present in an amount of about 10% to about 90% by weight of the palmeric material. 39. A foam sheet according to claim 38, wherein the crosslinked component comprises a weight amount of the palmeric material from about 15% to about 45% gel in accordance with that determined by ASTM test D-2765. 40. A sheet of foam that encapsulates a recycled polymeric material comprising a component selected from the group consisting of PVC, PVDC, and mixtures or compositions thereof.