DE4113786C2 - Pack for agri-chemical chemicals - Google Patents

Description

The invention relates to a pack for agriculturally used chemicals according to the preamble of the claim 1. Such a package is known from WO 89/12590.

At present, most hazardous liquid agricultural chemicals become blended used chemicals in metal drums or, if smaller containers are needed, in plastic containers stored.

Dangerous chemical compounds in agriculture especially compounds used in crop protection, are formulated in many different ways. Regardless, however, there is a special need in agriculture, such compounds in to handle liquid form, since this also the Application and distribution of such compounds facilitated become. The handling of liquids brings However, difficulties and disadvantages. liquids can be spilled on the ground or off Leaves leaking in the containers. The containers can also be exposed to mechanical stress how to break or tear up bumps.  

It is therefore difficult to find a suitable container system to be specified, in particular for use in agriculture suitable and for all concerned with the handling Persons as well as for the environment sufficient security offers.

Soluble pouches or bags made of films as Containers for agricultural chemicals are already known. However, such films can get cracks and tear open, so that the chemicals contained leak and can be spilled. In fact, there is a variety of defects that may be present in films, to a corresponding vulnerability in the film lead and therefore represent a potential leak can. The presence of air bubbles, dust particles or other foreign bodies, gel particles or small dots on or in the slide are all potential weak If a slide with such a weak pose numerous handling stresses or physi impact, shock or impact loads is subjected, the film may leak at this point become. This puts in the field of agricultural chemistry a problem where appropriate containers during storage, Middleman or farmers of a rough handling can be subjected, often under impermissible Safety conditions.

The above-mentioned weaknesses in plastic films lie in certain slides, depending on the nature of their position, to a greater or lesser extent. If Foils are made by casting, they contain in the Usually less pores or bladder inclusions, however  frequently small gel inclusions. When the slides through On the other hand, more pores occur or bubbles on.

The invention is based on the goal, the off occur from liquid or dissolved or dispersed Che through holes or pores in a film container avoid system. Although pores and fine holes all rarely occur in plastic films, is already sufficient the occurrence of a single hole in one of several Thousand containers to more or less great damage to cause, since the liquid contained in the container leaking through the hole and in the case of a dangerous one Liquid to a corresponding contamination the environment leads.

WO89 / 12 590 describes a liquid package with a water-soluble bag in a plastic cup arranged with aluminum foil lid. The aluminum foil is removed during use and the bag from the Mug taken out. It is not guaranteed that the user not with the possibly from small openings in the Bag of leaking chemical comes into contact with there the leaking liquid in the cup the space between its inner wall and the bag fills and the bag wetted with it.

DE-GM 18 24 283 describes a packaging film, the consists of two layers. Of these, the inner layer is in a solvent soluble. The outer layer is present deducted from use. Again, there is a risk that the user with the chemical in the packaging comes in contact when it peels off the outer layer.  

The DE-GM 18 62 386 has a self-opening by water Plastic film package to the subject. Here are just the Welds the laminate package water-soluble, so that a pack thrown in water after it has been emptied the water must be pulled out. The latter is then also with the contents of the package from all sides in Touch came.

From DE-OS 30 17 246 a laundry bag is known, the dissolves during the washing process in several stages. In this case, an inner layer is cold water soluble and the outer layer is soluble in warm water. This will achieve that the laundry bag first at its seams is opened and the laundry is released and then slowly dissolves during the washing process. On tightness against liquids it comes with such Laundry bag not on.

Finally, US Pat. No. 4,765,916 describes a film package, consisting of a laminate foil whose different Layers at a pH of them dissolve surrounding liquid.

The present invention is based on the object, a generic pack to improve to the effect that the Pack is easier to produce and better against damage in the production (pin-holes), during storage (eg. Frost) as well as during transport and handling (impact, Shock, stretching action) is protected.

This object is achieved with a package according to claim 1.

Features of preferred embodiments are the subject of Dependent claims.  

The use of water-soluble or water-dispersed Barer film container has particular Vor vor special parts for the practice, when the content in water or in an aqueous phase to be dissolved or dispersed, since it is sufficient in such cases, the unopened pack in to introduce the corresponding aqueous phase, since the Foil container dissolves more or less quickly or is dispersed and the content is released. Dement Any contact of persons with the In Hold such chemical packs, as he usually at Öff NEN by cutting u. Like. Occur, certainly ver avoided.

The materials of the laminate film are accordingly also ent speaking so chosen that they are in the resulting aqueous solution or aqueous dispersion do not disturb or are inert towards the active substances present hold.

In the context of the invention are under laminate films such Plastic films understood, consisting of two or more ur originally separated layers by joining herge are. This lamination can be known per se Procedure done. For example, the individual Layers of the laminate by the action of pressure, heat, by cross-linking, melting, gluing or adhesion or any combinations of these measures made who  the. Adhesion or adhesion of the layers can by using a separate adhesive, in particular an adhesive adhesive can be achieved. In suitable cases len, when using water-soluble or dis pergatable laminate materials, for bonding also water be used.

When suitable water-soluble or dispersed in water bare layers can be used, corresponding La Minatfolien in a particularly suitable manner by gluing the individual layers are generated, either PVA adhesive (generally of low molecular weight) and / or even easier water is used.

As within the scope of the invention, at least two layers for Production of the laminate films used is the Probability of the appearance of fine holes or Pores in the laminate films reduced to virtually zero. This is because it is extremely unlikely that two holes in different layers over exactly to come to rest In addition, the Zugfe strength of a multilayer film, even one already two-layer laminate film, better than the tensile strength a comparable film of the same thickness, the only off a layer exists.

The laminate films used in the invention be generally sit a thickness of 10 to 250 microns and preferential wise 15 to 80 microns. The individual layers that make up the Laminate films used according to the invention are constructed, generally have a thickness of half the above values. Using  of two layers is the ratio of the thicknesses of the two Layers generally in the range of 0.1 to 10 and preferably in the range of 0.5 to 2.

Bags or pouches of laminate films according to the invention generally have a capacity of preferably 0.2 to 121, and more preferably from 0.45 to 6 liters.

According to an advantageous embodiment of the invention the materials used for the laminate film are what water soluble or dispersible in water and at the same time in insoluble in organic solvents that dissolve or Dispersing those contained in appropriate containers agricultural chemical used. Suitable materials for the The purpose is, for example, polyethylene oxides or Methylcellulose. Particularly preferred materials are Polyvinyl alcohol and / or derivatives thereof, in particular partially or completely alcoholized or hydroly siert polyvinyl acetate, particularly advantageous to 40 bis 99% and more preferably 70 to 92% alcoholized or hydrolyzed polyvinyl acetate.

The layers of the laminate films according to the invention can from the same material or from different ma materials. Slides of different layers materials can have advantageous properties point. For example, an inner layer of a Film container made of a material opposite one contained in the container Agricultural chemical, more stable than that remaining layers of the laminate film. Furthermore, the outer Layer of the film container according to the invention  advantageously be selected so that they one or more of the has the following properties:

• i. Faster solubility in water compared to the inner layer or a foil package of a single Layer;
• ii. improved mechanical properties, including improved mechanical resistance;
• iii. improved machinability;
• iv. lower humidity sensitivity (relative humidity);
• v. Resistance to freezing and / or high temperatures.

Due to a suitable plasticizer content in the inner layer can be tightness or sealing properties of the films improved and the corresponding film are made less elastic. Corresponding films are easier to machine BEITEN; furthermore, the sealing in of dangerous liquids is also possible in such containers. By a ge suitable plasticizer content in the outer layer of a Film container according to the invention, the outer layer more flexible and thus against physical damage to be made more stable, those of lower tempera or impact, impact or stretching action or of the Transportation could come.  

The layers of the laminate films can be different Process be prepared, for. B. by extrusion or To water. Laminates of different layers Processes produced can have beneficial properties including higher flexi stability, increased strength and increased tensile strength. The increased strength and / or tensile strength can thereby in one direction in the film. The inventor The laminate films used according to the invention are used in the art Use of packaging, with the time-consuming and dangerous consequences to be avoided with associated with the use of conventional foil packages are in which when filling or during the subsequent continuous handling due to defects in the film leaks may occur.

As already explained above, the inventive Chemical packs liquids or gels. According to a preferred embodiment Form of the invention contain the film container or Chemical packs a gel.

According to a further advantageous embodiment of the Conception of the invention, the gels are selected such that that they contain one or more of the following Features include:

• The resulting gels form a continuous one System, and / or
• the resulting gels have a viscosity of 500 to 50,000 cP (0.5 to 50 Pa.s) and preferably a viscosity of 1000 to 12,000 cP (1 to 12 Pa.s) (the viscosity values reported being Brookfield viscosities which are measured with a viscometer in the form of a flat plate rotating at a speed of 20 min ^-1 ;
• * the gel has such a phase difference φ between the controlled shear stress and the resulting shear deformation on that tan φ1.5 and preferably 1.2, wherein tan the Tangent of the angle φ (or the phase difference) is. The measurement of φ is carried out with a rheometer with a flat solid plate and a rotating one Cone above this plate such that the Angle between them <10 ° and preferably 4 ° is. The cone comes with a speed controlled Motor driven; the rotation is sinusoidal, d. h., That torque and angular displacement are change in time according to a sine function. These Angular shift corresponds to the above mentioned Shear deformation; the torque of the speed-controlled Motor (which causes the angular displacement) corresponds to the above-mentioned controlled Shear stress;
• The gels preferably have a density <1 and preferably <1.1;
• * the gels have a spontaneity (as below defined) <75 and preferably <25.

Spontaneity is determined according to the following procedure:
A mixture of 1 ml of gel with 99 ml of water is placed in a 150 ml glass tube, which is closed and rotated by 180 °, ie, turned upside down. The number of such processes that are required to completely disperse the gel is referred to as spontaneity.

Under a continuous system, a material is ver which is visually homogeneous, d. h., due to the visible appearance only a physical phase seems wise; this does not exclude the possibility that solid particles are dispersed therein, if these Particles are small enough that they are not visible represent a good physical phase.

It is known that a gel is generally a colloid where in the disperse phase with the continuous phase so combined is that a viscous, jelly-like product is present; it also represents a disperse system that typically from a high molecular weight compound or an aggregate of small particles in very close association with a liquid.

To produce a bag, the film must be in an ent be brought to a meaningful form (if necessary. Partially zugesie which can be filled with the gel. gels are generally flowable, even if the flow rate Due to high viscosity is only small. Folienbehäl ter or chemical packs used to store Gels can be used, therefore, due to the high Gel viscosity can not be easily emptied again (which is why Gels hitherto in agriculture or agricultural chemistry Not used). After filling the bag must finally sealed for closing  become what generally happens with heat.

The invention is described below with reference to execution examples explained.

example 1

A film in roll form is made by laminating two made thinner films: The two films are made from an 88% hydrolyzed polyvinyl alcohol (cold water-soluble), and each have a thickness of 25 microns on. The one film has a plasticizer content of 17%, the other a softener content of 15%. The both films are heated (100 ° C) and Druckein laminated together, creating a film of 50 microns Thickness is obtained.

This film is then used to make bags of 1 liter capacity containing a liquid herbicide (mixture of ioxynil and Bromoxynil esters) solvent-based, the so-called. Form and Füllver be used. The herbicide is a solu tion in a mixture of aromatic C ₁₀ hydrocarbons as a solvent.

The film is placed on the machine so that the Layer with the higher plasticizer content on the outside side of the film container produced is located. The foil is easy to process in this way.

During production, handling and transport of 500 correspond no sacks were detected.  

Example 2

It becomes a gel by stirring the following mixture produced at 50 ° C:

Active ingredient: 2,4-Diphenoxybenzoesäureisooctylester: 64.8% Solvent: @ Aromatic solvent with a flashpoint of 65 ° C: 24.2% Surfactant: @ Mixture off @ a nonionic, sulfonate blended emulsifier 4% and @ calcium alkylbenzenesulfonate 1 gelling agent: @ Mixture of dioctylsulfosuccinate in salt form and sodium benzoate 6%

The mixture is stirred and shaken until all compo nents are dissolved or dispersed.

While stirring, first solution and then gelling on. The gelation decreases during the Ab Cool to room temperature (20 ° C).

The Brookfield viscosity of the gel is 3000 cP (3 Pa · s). The emulsion stability according to the above beschrie The test is good.  

1100 g of this gel are placed in a 1 liter film container brought from a PVA film like the foil container of Example 1 consists. The almost completely filled Film container (about 95% V / V) is then heated sealed closed. The density of both the gel and the resulting pack are 1.1.

The foil pack is then ten times from a height dropped by 1.2 m to the ground. This is no Tearing or occurrence of leaks detected.

Another package prepared in the same way was tested for their puncture resistance. This was a needle (Diameter 0.6 mm) pierced through the film. there a small droplet was observed at the The puncture site formed, but it was small enough that it not dripped from the pack and not at you ran along.

Claims (19)

1. pack for agrikulturchemisch used chemicals such. As herbicides, fungicides, which are dissolved or dispersed in concentrated form in a liquid and / or viscous gel, wherein the package has at least two shells, of which the inner envelope containing the chemicals consists of a cold-water-soluble, heat-sealable plastic film, characterized the second outer cover also consists of a cold-water-soluble, heat-sealable plastic film firmly adhered to the inner cover to form a laminate film prior to formation of the package into a flexible bag, and the outer layer of the laminate film is rendered more resistant to physical deterioration by a suitable plasticizer content Damage is as the inner layer. 2. Pack according to claim 1, characterized, that the laminate film has a thickness of 10 to 250 microns. 3. Pack according to claim 1, characterized, that the laminate film has a thickness of 15 to 80 microns.   4. Pack according to claims 1 to 3, characterized, that they have a capacity for chemicals of 0.2 to 12 l and preferably 0.45 to 6 l. 5. A package according to claims 1 to 4, characterized, that at least two of the layers of the laminate film in the liquid chemicals or are insoluble in the liquid or the gel, the Dissolving or dispersing the chemicals are used. 6. Pack according to claims 1 to 5, characterized, that at least one of the layers of the laminate film Polyethylene oxide, methylcellulose or partially or completely alcoholized or hydrolyzed polyvinyl acetate consists. 7. A package according to claims 1 to 6, characterized, that at least one of the layers of the laminate film to 40 to 99% alcoholysed or hydrolyzed Polyvinyl acetate exists. 8. Pack according to claims 1 to 6, characterized, that at least one of the layers of the laminate film to 70 to 92% alcoholysed or hydrolyzed Polyvinyl acetate exists. 9. Pack according to claims 1 to 8, characterized, that at least two of the layers of the laminate film consist of the same material.   10. A package according to claims 1 to 9, characterized, that at least two of the layers of the laminate film consist of different material. 11. A pack according to claims 1 to 10, characterized, that several or all layers of the laminate film contain a plasticizer. 12. A pack according to claim 11, characterized, that at least two layers of the laminate film one Contain softeners, one of which is the outermost Layer is, and this outermost layer is the higher Plasticizer content has. 13. A pack according to claims 1 to 12, characterized, that the laminate film consists of two or substantially consists of two layers. 14. A pack according to claims 1 to 12, characterized, that the laminate film of three or more or substantially consists of three or more layers. 15. A pack according to claims 1 to 13, characterized, that the ratio of the thicknesses of the two layers of Laminate film is 0.1 to 10.   16. A package according to claim 13 and 15, characterized, that the ratio of the thicknesses of the two layers of Laminate film is 0.5 to 2. 17. A pack according to claims 1 to 16, characterized, that the agricultural chemicals dissolved in a gel or are dispersed, which has a viscosity of 500 to 50,000 cP (0.5 to 50 Pa · s) and preferably 1000 to 12,000 cP (1 to 12 Pa · s). 18. Pack according to claims 1 to 17, characterized, that the chemicals are dissolved or dispersed in a gel are that have such a phase difference between the controlled shear stress and the resulting Shear deformation has tan of 1.5 and preferably tan is 1.2. 19. A pack according to claims 1 to 18, characterized, that the agricultural chemicals dissolved in a gel or are dispersed, which has a spontaneity of less than 75, and preferably less than 25.