MX2007008677A - Coextrudible resin and dye compounds for containers of refrigeration-free and high decomposition resistance liquid food. - Google Patents

Abstract

The present invention is related to the industry of plastic compounds for packages containing liquid food, beverages, dairy products, milk and derivatives thereof having organoleptic characteristics and a refrigeration-free long useful life. Chemtex Industry is intended to promote the preservation of food in order to avoid food wastes, thereby maintaining it fresh and preserving the nutritional properties thereof, also turning food into an accessible product in areas of difficult access and where no refrigeration distribution chain is available. The present invention is related to the industry of plastic compounds for packaging liquid food, beverages, dairy products, milk and derivatives thereof having organoleptic characteristics and a refrigeration-free long useful life, and more particularly to the liquid food industry. The advantage of the containers of the present invention is that they may be filled up in pollution- and bacteria-free environments and under controlled processes s aid condition may be guaranteed for long periods of time without applying refrigeration processes thereto, thereby obtaining substantial savings in electric power as well as in the characteristics of the projects regarding storing designs and handling thereof. The containers manufactured with the present compounds are effectively recycled. When the containers made of the present compounds are recycled, the raw material thereof being recovered and reused. The polyethylene particles used in the present compound may be indefinitely reused and turned into different plastic products utilised in any industry including the food industry. The inventive compound is based on petrochemical compounds, including the mixture of different resins resulting from ethylene (polyethylene) in a density ratio of from about 0.960 gms/cm3 to about 965 gms/cm and a flow rate of from about 1.5 g/10 min to about 2.5 g/10 min according to the test based on ASTM D1238 in white colour based on titanium dioxide, di spersants, additives and black colour based on carbon black, dispersants and additives. The characteristics of the compound are such that allow the same to be processed in a consistent manner, maintaining the resistance, rigidity and low weight characteristics thereof, also allowing the same to be adhered to further layers of a compound having the same resin base, under certain parameters of temperature. The compound is generally manufactured out according to the products containing the same, said products being easily decomposed in case of not being stored within materials that protect the same against the quick penetration of oxygen and UV beams, or materials that do not maintain a suitable asepsis for eliminating bacteria generation, the aforementioned problem being the main element causing food decomposition. The main advantage of the inventive compound is the maximum elimination of odours which may affect the product to be packed.

Description

COMPOSITE OF COEXTRIBLE RESINS AND PIGMENTS FOR REFRIGERATING FREE LIQUID FOOD PACKAGINGS AND HIGH RESISTANCE TO DECOMPOSITION INVESTIGATION CAMP This research is related to the industry of plastic compounds for packaging containing liquid food, beverages, milk, milk and derivatives with organoleptic characteristics, long shelf life without refrigeration.

BACKGROUND OF THE INVENTION In the present invention it is understood as petrochemical compounds the mixture of different resins derived from ethylene (polyethylene) with a density ratio of 0.960 to 965 gms / cm3 and a flow index of 1.5 to 2.5 g / 0 min according to with the test based on ASTM D1238 in white color based on titanium dioxide, dispersants, additives and the black color based on carbon black, dispersants and additives. The characteristics of the compound should be such that they allow its processing in a consistent manner maintaining the characteristics of resistance, rigidity and low weight allowing its adherence to other layers of a compound that has the same resin base, under certain temperature parameters.

The compound is generally manufactured according to the products that contain them, these being those of easy decomposition if they are not stored inside materials that allow them to be protected against rapid penetration of oxygen and ultraviolet rays or that do not maintain the corresponding ascepcia eliminating generation. of bacteria, being this the main element for the decomposition of food. Likewise, the great advantage of this compound is the elimination to the maximum of odor and odor that could affect the product to be contained.

The advantages in the use of this type of compounds allows the storage of products of easy decomposition for a period of more than 90 days without refrigeration under the so-called aseptic, and / or clean environment.

These compounds require an exact control in their formula that allows the easy processability in different types of machinery, maintaining the consistency in their fluidity under a consistent temperature profile in the process, maintaining the rigidity and sellability in the final product being these containers, bottles, containers and / or any other type of packaging including films.

There are other materials that are applied to this type of products being only resins which do not maintain their consistency in the process and have a high degree of odor and odor in the final products. They are also manufactured under other polymerization principles that are expensive.

In the industry, different materials are currently used, such as cardboard laminations with plastic that ensure aseptic handling but with a high operating cost that makes the final product more expensive.

Current products are based on cellulose also related to the use of trees for the production of paper, which is an industry that in addition to consuming trees necessary to preserve the ecology, generates polluting products, as these are laminated with plastic films and highly aluminum pollutants since they do not allow recyclability and reuse is very limited.

This characteristic of cellulose / plastic / aluminum containers is already considered in many countries as hazardous waste.

In our case, being 100% plastic products and 100% approved for the food industry, they are 100% recyclable, which has the protection to the environment.

OBJECTIVES OF THE INVENTION One of the objectives of the present invention is related to the production of a plastic material that does not generate odors.

Another objective of the present invention is to achieve a polyethylene compound that can be controlled in any process of extrusion, injection and / or blowing, giving consistency in its rigidity; low weight and sealability, as well as being highly ergonomic and organoleptic.

Still another of the objectives is that when sealing the product, its oxygen and ultraviolet barrier characteristics are maintained, protecting the entjrada or generation of bacteria, allowing the filling in an aseptic process and / or in a clean environment.

Still another objective of the present invention is to achieve a material that is basically homopolymer and non-copolymer.

Other objects and advantages of the present invention may be apparent from the study of the following description.

BRIEF DESCRIPTION OF THE INVENTION The present invention has two aspects, on the one hand a novel material, then the mechanical characteristics that the container of consumer products must have and then the procedure for obtaining said material.

After multiple tests, it was possible to determine that one of the qualities that the compound with which the containers had to be manufactured should be: 1) consistency in the EBM process 2) rigidity 3) adequate weight 4) barrier level 5) minimal odor and smell This rigidity will allow easy filling of the container by not forming bends that hinder the flow of material to the bottom of the container.

Likewise, this rigidity will allow you to keep the shape once full, avoiding that it be rounded with the product inside it and therefore maintaining its rigidity before and after the filling process allowing its accommodation in the transportation: 1) with weight: maintaining an adequate fluidity index allows the compound's processability to be optimal in high productivity machines. 2) Rigidity: Having an adequate density allows maintaining the optimum rigidity of the container to be filled in high speed machines. 3) The adequate density in the compound allows to maintain low weight in the product, which benefits in the cost by using the minimum of required compound. 4) The union of our compounds under the process of lamination and sealing allows us to maintain a high level of barrier to oxygen and ultraviolet rays, preventing the entry and / or generation of bacteria, preventing the decomposition of the products to be contained. 5) Minimum odor / minimum odor. The use of suitable resins in the proper conformation of the compound is important to minimize odor or odor in the product.

For the previous thing it was found that the suitable material for this is the combination of two or more polyethylene resins with a density of .920 to .970 gr / cm3 and a fluidity index of 0.1 to 3.0 grs / 10 min according to the test based on ATSM D1238 in white color based on titanium dioxide, dispersants, additives and black color based on carbon black dispersants and additives. The characteristics of the compound must be such that they allow its processing in a consistent manner maintaining the characteristics of strength, rigidity and low weight allowing its adhesion to other layers of a compound that has the same base of resins, under certain temperature parameters.

When the polyethylene compound is used in combination with other materials, this combination can be carried out by pre-mixing the resins and then the extrusion and blowing will be carried out. But there is also the option to co-extrude the resins to form concentric layers joined together through passage through a co-extrusion head.

Another existing process that can be taken into account is the manufacture of a polyethylene resin that matches the characteristics of the compound from a reactor.

To make the polyethylene is injected ethylene gas in a reactor at a temperature between 25 and 100 ° C, and a pressure between 1 and 90 kg / cm2, which contains a suspension based on aluminum ethylate and ester of titanium in an oil, these last two are the catalysts, which make a hydrogen of the three that is attached to the terminal carbon is detached, leaving the unstable carbon. By doing this with ethylene molecules, the carbons are joined together forming a larger molecule, this molecule that is forming is polyethylene. To get the polyethylene chains to have a beginning and an end, what is done is to lower the temperature of the reactor and lower the amount of catalysts in the reactor, thereby achieving that the catalyst no longer removes more hydrogen from the carbons. and immediately afterwards pure hydrogen is injected into the reactor so that it binds to the carbons and thus the reaction ends.

In other words, the process for producing the material object of the present application is to inject ethylene into the tube reactor, by passing it through the steam that is generated with the com-ination of the catalysts. When the pressure is reached which shows that the polyethylene chains are already of the required length, ie between ± 70 kg / cm2 and 75 ° C, pure hydrogen is injected to cut the growth of the polymer chain.

The invention has been sufficiently described so that a person with average skill in the art can reproduce and obtain the results that we mentioned in the present invention. However, any person skilled in the art who is competent in the present invention may be able to make modifications not described in the present application, however, if the application of these modifications in a determined structure or in the manufacturing process thereof, is required of the matter claimed in the following claims, said structures must be included within the scope of the invention.

Claims (3)

R E I V I N D I C A C I O N S Having sufficiently described the invention, it is considered as a novelty and therefore it is claimed as property what is expressed and contained in the following claim clauses:

1. Composite for the manufacture of containers for products sensitive to oxygen, visible light and ultraviolet rays, characterized in that it consists of the mixture of different resins derived from ethylene (polyethylenes) with a density ratio of 0.960 to 965 gms / cm3 and a fluidity index of 1.5 to 2.5 g / 10min according to the test based on ASTM D1238 in white color based on titanium dioxide, dispersants, additives and black color based on carbon black, dispersants and additives; The characteristics of the compound allow its processing in a consistent manner maintaining the characteristics of strength, rigidity and low weight allowing its adhesion to other layers of a compound that has the same base of resins, under certain temperature parameters.

2. Composite for the manufacture of containers for products sensitive to oxygen, visible light and ultraviolet rays, as claimed in the previous claim, characterized in that they are also able to maintain an adequate fluidity index and allow the processability of the compound is optimal in machi- high productivity products with a mixture of resins of similar or identical origins; with a rigidity that having an adequate density allows to maintain the optimum in the container to be filled in high speed machines; These compounds are used in the production of containers through the process of lamination and sealing; therefore, it was found that any material that is formulated with an origin by the combination of two or more polyethylene resins with a density of .920 to .970 gr / cm3 and a fluidity index of 0.1 to 3.0 g / 10 min according to the test based on ATSM D 1238.

3. Process for the preparation of compounds for the manufacture of packaging for products sensitive to oxygen, visible light and ultraviolet rays, characterized in that it consists in the steps of injecting ethylene in the form of gas in a reactor at a temperature between 25 and 100 ° C, and a pressure between 1 and 90 kg / cm2, in a reactor containing a suspension based on aluminum ethylate and titanium ester in an oil, these last two are the catalysts, which make a hydrogen of the three that has uni- two carbon terminal is detached, leaving the unstable carbon and bonding with the neighboring carbon forming a larger molecule, this molecule that is forming is polyethylene; to stop the polymerization, when the pressure is reached which shows that the polyethylene chains are already in the required length, ie between ± 70 kg / cm2 and 75 ° C, pure hydrogen is injected. SUMMARIZES This research is related to the industry of plastic compounds for packaging containing liquid food, beverages, milk, milk and derivatives with organoleptic characteristics, long shelf life without refrigeration. In Chemtex we have proposed to help preserve food and avoid waste, keeping it fresh and preserving its nutritional properties, making it accessible in areas of difficult access and where there is no refrigerated distribution chain. This inestigation is related to the food industry. the plastic compounds for packaging that contain liquid food, beverages, dairy products, milk and derivatives with organoleptic characteristics, long shelf life without refrigeration, and more specifically with the liquid food industry. The advantage of the containers of the present inestigation is that they can be filled in bacteria-free and contaminated environments and under controlled processes they can guarantee this condition for long periods without the need of carrying out refrigeration processes, which guarantees important savings in electric power as well as the characteristics of the projects in their storage and handling designs. The containers manufactured with our compounds are recyclable efficiently. When the in-vases of our compound are recycled, the raw materials that form it they are recovered and used again. The particles of Polyethylene-not used in our compound can be reused infinitely and can be converted into different plastic products inside and outside the food industry. Our compound is composed of petrochemical compounds by mixing different resins derived from ethylene (polyethylenes) with a density ratio of 0.960 to 965 gms / cm3 and a flow index of 1.5 to 2.5 g / 10min according to the ASTM-based test D1238 in white color with titanium dioxide base, dispersants, additives and black color based on carbon black, dispersants and additives. The characteristics of the compound must be such that they allow its processing in a consistent manner maintaining the characteristics of strength, rigidity and low weight allowing its adhesion to other layers of a compound that has the same base of resins, under certain temperature parameters. The compound is generally manufactured according to the products that contain them, these being those of easy decomposition if they are not stored inside materials that allow them to be protected against rapid penetration of oxygen and ultraviolet rays or that do not maintain the corresponding ascepcia eliminating the generation of bacteria , being this the main element for the decomposition of food. Likewise, the great advantage of this compound is the elimination to the maximum of odor and odor that could affect the product to be contained.