Stabilisation of light sensitive substances

A - Human Necessities – 01 – N

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A01N 25/22 (2006.01) A01N 53/00 (2006.01)

Patent

CA 2411579

An emulsion comprising an organic discontinous phase which is distributed through a continuous aqueous phase, wherein the organic phase comprises a light sensitive active ingredient, and the emulsion is stabilised by a water soluble stabilising material in the aqueous phase, wherein the water-soluble stabilising material is a water-soluble stabilising polymer which has a plurality of hydrophilic and hydrophobic groups and is selected from partially hydrolysed polyvinyl acetate and addition copolymers formed from (i) at least one ethylenically unsaturated carboxylic acid esters and (ii) at least one ethylenically unsaturated carboxylic acid or ethylenically unsaturated carboxylic acid anhydride, and wherein the organic phase further comprises, a) an organic solvent which is a liquid at 25 ~C and/or b) an organic phase stabilising material comprises hydrophobic moieties and is a material which is more soluble in the organic phase than the aqueous phase. The composition is useful for protecting light sensitive active ingredients which would otherwise in neat form decompose on exposure to light, preferably sunlight. The invention is of particular value when the light sensitive active ingredient is a pesticide, herbicide or a veterinary treatment active. Preferably the light sensitive active ingredient is a light sensitive pyrethroids. The invention also contemplates a domestic pest control formulation comprising light sensitive pesticides.

L'invention concerne une émulsion comprenant une phase organique discontinue distribuée dans une phase aqueuse continue, la phase organique comportant un ingrédient actif sensible aux rayonnements lumineux, et l'émulsion étant stabilisée au moyen d'un matériau de stabilisation soluble dans la phase aqueuse. Le matériau de stabilisation soluble dans l'eau est un polymère stabilisant hydrosoluble qui comporte plusieurs groupes hydrophiles et hydrophobes, et qui est sélectionné parmi un acétate de polyvinyle partiellement hydrolysé et des copolymères d'addition formés à partir (i) d'au moins un ester d'acide carboxylique à insaturation éthylénique et (ii) d'au moins d'un acide carboxylique à insaturation éthylénique ou d'un anhydride d'acide carboxylique à insaturation éthylénique. La phase organique comprend, en outre, a) un solvant organique liquide à 25 ·C et/ou b) un matériau de stabilisation de phase organique comportant des entités hydrophobes qui est plus soluble dans la phase organique que dans la phase aqueuse. La composition est utile pour protéger des ingrédients actifs sensibles aux rayonnements lumineux qui autrement, sous forme pure, se décomposeraient à l'exposition de rayonnements lumineux, en particulier à la lumière du jour. L'invention prend une valeur particulière lorsque l'ingrédient actif, sensible aux rayonnements lumineux, est un pesticide, un herbicide ou un principe actif de traitement vétérinaire. L'ingrédient actif, sensible aux rayonnements lumineux, sont de préférence des pyréthroïdes sensibles aux rayonnements lumineux. L'invention concerne aussi une formulation contre les parasites domestiques comprenant des pesticides sensibles aux rayonnements lumineux.

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