IL31585A - Plastic sheet laminates for liquid pesticide containers - Google Patents

Description

SHEET CONTAINERS invention relates to laminates suitable for the manufacture of but not for for agricultural or public health use dissolved in organic in particular in aromatic solvents such as petrol fractions and solvent naphtha used or mixed with other solvents of following paraffin chlorinated or ketones and and products are never supplied pure to the The as well as the physical and chemical properties of these products oblige pesticide manufacturers to put the active material is to say the pure in the form of compositions the utilization of which is more practical and more Liquid formulaeconstituted by solutions of active material and an emulsifie in organic solvents are amongst the most utilized These formulae have two essential their preparation is extremely simple since it is sufficient to dilute them the volume of water necessary to obtain the formula ready their passage through orifices of the treating apparatus presents no difficulty since the formula contains no solid matter in The risks of blocking are thus practically The most used types container for this type of formulation are made of metal or Suitable metal according to the volume are or cans of black iron or aluminium the interior walls which are usually varnished to avoid risk of The cost of these containers is thus relatively high it is even more so for containers of small Pesticide often have a high toxicity and pesticide treatments are often carried out by hardly aware of the inherent risks of the products which they are handling and for whom the dangers of poisoning are thus even It is thus important to avoid repeated handling of containers for dosing operations which is not possible when containers of large dimensions are The practical solution is to supply to the user single doses of pesticide for to the volume of the which permits him to transfer only a single dose into his treating According to the products the corresponding single doses are of the order of several dozens hundreds of The cost of providing such single doses in conventional metallic containers becomes all the greater to the cost of the container itself are added the cost of transport which being themselves a function of the are proportionally higher as the for example for the same volume the weight of the various conventional containers approximately the Aluminium g Tin plate 155 g Glass 700 On the a container the same volume in plasties of everyday thickness only from 10 to 20 The saving is thus Even apart from any the metallic container presents large difficulties for its disposal after In it is not sufficient to throw these containers on fo a dump where they could be the eource of grave but they be made safe or made for by burying in It is clear that this problem is very difficult to solve with metallic containers which cannot be burnt and the volume of especially when they are in requires considerable excavation for burying in was hoped that the considerable developments in the field of plasties packaging would lead to discovery of a practical solution to the However no solution has yet been found since the plasties must meet up to numerous requirementsj in particular sufficient mechanical resistance impermeability to diluents and used oar research has now that plastic laminates incorporating regenerated a vinyl polymer o and possess these qualities These plastics laminates may comprise the following superimposed layers in intimate for or adjacent intermediate layers may be partially or wholly by a polyolefine layer a regenerated cellulose layer vinyl polymer or copolymer Trade or polyvinyl and a polyamide Trade layer Saran is vinyl chloride an chloride copolymer Rilean is nylon The order of introduction of the various constituents of the above defined complex is not of primary however is desirable for queetions o weldability and printing that the outer layers be the polyolefine and the Trade In the polyolefine should preferably be on the that which is contact the and the Trade shall preferably constitute the although they may be The interior part of laminate is constituted by two layers the cellulose and of the vinyl polymer or copolymer stuck One the other or a single layer of one of the constituents coated on the viscose coated with Trade Apart from the four the presence of which is it is possible to include in the laminate a supplementary layer of aluminium intended provide a bette resistance to light An identical result can be obtained by tinting throughout one several of the above listed constituents to exclude harmful light Among the laminates which have given particularly interesting results for this type of calk be cited a laminate of thickness mm and having following VISCOSE POLYETHYLENE or OR IMPREGNATED POLYETHYLENE In use the layer will form the exterior o the container intended to verify the ability of this laminate to pack the previously defined liquid peetieides have been carried out with sachets containing 100 g of a solution of pesticide of composition parts by ENDOSULFAN 200 EMULSIFIANTS 50 CYCLOHEXANONE 60 normal name for ethane normal name benzo dioxathiepin 3 The variation o test of less than 1 at and less Identical tests were carried out with a composition containing the elements as in the preceding with the addition of It is known that composition of l and as well as all the phosphate ester insecticides possess plastleising properties with respect to PVC and is unsuitable for use The results obtained show a loss of weight which is perfectly By way of comparison and for tests carried out in the same the loss of weight with various plastics are approximately the Polyvinyl chloride to aromatic 1 Low pressure polyethylene High pressure polyethylene Polypropylene thickness of the laminate used has only a relatively secondary importance and depends on volume of liquid to be This thickness can go several hundredths mm to 1 a thickness of order of mm being in general sufficien to have a comple of satisfactory The laminate an additional opaque layer or may partially or wholl tinted to exclude harmful light The form of the container can equally be any whatsoever and be eventually determined by the conditions of and The containers can be flat or and when they are flat they can be simply rectangular or trapezoidal or cut off in a manner such that one of thei extremities can form a dispensing An extremit forming a dispensing stopper can be provided with a device allowing reclosing of the containe after This when the container volume corresponds to several unit will be usefully completed b a dosage system for by equidistant lines printed on the interval between two corresponding to the unit insufficientOCRQuality

Claims (1)

1. 3158S-2 WHAT IS CLAIMED ISt 1. A plastics sheet laminate incorporating polyolefine, regenerated cellulose, a vinyl polymer or copolymert and polyamide. 2* A plastics sheet laminate consisting of individual laminae of polyolefine, regenerated, cellulose, Vinyl polymer or copolymer, and polyamide* 3* A laminate as claimed in Claim 1 comprising an intermediate t twatt lamina consisting of one of said constituents coated with another of said constituents. 4. A laminate as claimed in Claim 1 comprising an Intermediate incorporating a plurality of said constituents* 5* A laminate as claimed in Claim 1 comprising a lamina incorporating two of said constituents* 6* A laminate as claimed in Claim 5 or 6 wherein adjacent intermediate laminae are partially intermixed* 7* A laminate as claimed in any preceding Claim wherein the polyolefine is nnl fhyTtma or polypropylene* 8* A laminate as claimed in any preceding Claim wherein the regenerated cellulose is viscose* 9· A laminate as claimed in any preceding Claim wherein the vinyl polymer or copolymer is vinyl chloride and vinylidene chloride copolymer or polyvinyl alcohol* 10* A laminate as claimed in any preceding Claim wherein the polyamide is nylon or nylon L1* 11* A laminate as claimed in Claim 1 comprising four layers oft (i) Nylon 11 (11 ) Viscose (iii) Vinyl chloride and vinylidene chloride copolymer, (iv) Polyethylene* respectively. 12, A laminate as claimed in Claim 1 comprising- outer laminae of nylon 11 and polyethylene and an dLntermediate lamina of viscose coated with vinyl chloride and vinylidene chloride copolymer. 13. A laminate as claimed in any preceding claim and which either comprises an additional opaque layer or is partially or wholly tinted to exclude harmful light rays. i , A container made from the laminate eiaimed in any preceding Claim. 15. A container as eiaimed in. Claim l4 wherein the walls are formed of the laminae set ou in Claim 2 in that order from the inside to the outside. 16. A container as claimed in Claim 1¾ or 15 which is tetrahedral in shape. 17· containe as claimed in Claim 1¾» 15 t or 16 which is provided with a dispensing stopper. 18, A container as claimed in Claim lkt 15, 16, or 17 containing a liquid pesticide, 19, A plastics laminate as claimed in Claim 1 substantially as hereinbefore described. 20, A container made of a plastics laminate as claimed in any one of Claim 1 to 13» or 19 substantially as described. ATTORNEYS FOR APPLICANT