Stable aqueous suspensions of pesticidally active solids adapted to be dispensed from aerosol containers

Claim 1

A PESTICIDALLY ACTIVE COMPOSITION ADAPTED TO BE STORED UNDER PRESSURE IN AN AWROSOL DISPENSER, SAID COMPOSITION CONSISTING ESSENTIALLY OF (I) A SUSPENSION, IN A PRIMARILY AQUEOUS MEDIUM, OF PARTICLES OF SOLID AGENT OF SIZED LESS THAN 50 MICRONS, AT LEAST A SUBSTANTIAL PORTION OF SAID SOLID AGENT BEING PESTICIDALLY ACTIVE, AT LEAST ABOUT 45% BY WEIGHT OF SAID SOLID AGENT CONSISTING OF HYDROPHOBIC SOLID SELECTED FROM THE CLASS CONSISTING OF ALUMINIUM, SULFUR AND ORGANIC COMPOUNDS WHICH ARE IN THE SOLID STATE AT ROOM TEMPERATURE, ARE INERT TO WATER AND ARE OF HYDROPHOBIC NATURE, AND FROM 0 TO AT MOST ABOUT 55% BY WEIGHT OF SAID SOLID AGENT CONSISTING OF PESTICIDALLY ACTIVE HYDROPHILIC SUBSTANCE, SAID SOLID AGENT BEING PRESENT IN SAID COMPOSITION IN AN AMOUNT OF FROM ABOUT 0.2 TO ABOUT 20% BY WEIGHT CALCULATED ON THE WEIGHT OF SAID COMPOSITION, AND (II) SUSPENSION-STABILIZING ADJUVANT COMBINATION CONSISTING ESSENTIALLY OF (A) HYDROPHILIC POLYSACCHARIDE COLLOID SOLUBLE IN COLD WATER, THE AMOUNT OF SAID COLLOID BEING SUCH THAT THE VISCOSITY OF THE MIXTURE OF COLLOID AND WATER PRESENT IN THE COMPOSITION IS BETWEEN ABOUT 1.5 AND 6 CENTIPOISES AT ROOM TEMPERATURE; (B) SURFACE-ACTIVE AGENT, WHICH IS LIQUID AT ROOM TEMPERATURE, IS CAPABLE OF GIVING A WATER-IN-OIL TYPE EMULSION AND WHICH IS A MEMBER SELECTED FROM THE GROUP CONSISTING OF (I) A MONOESTER OF A FATTY ACID AND AN ALKANEPOLYOL THE MOLECULAR WEIGHTS OF THE ALCOHOL AND ACID MOIETIES AND THE NUMBER OF HYDROXYL AND ETHER GROUPS OF WHICH ARE SUCH THAT THE HLB NUMBER OF THE ESTER IS AT LEAST 4 AND BELOW 9.. (II) A DIESTER OF A FATTY ACID AND AN ALKANEPOLYOL THE MOLECULAR WEIGHTS OF THE ALCOHOL AND ACID MOIETIES AND THE NUMBER OF HYDROXYL AND ETHER GROUPS OF WHICH ARE SUCH THAT THE HLB NUMBER OF THE DIESTER IS AT LEAST 3 AND BELOW 9, AND (III) A TRIESTER OF A FATTY ACID AND AN ALKANEPOLYOL THE MOLECULAR WEIGHTS OF THE ALCOHOL AND ACID MOIETIES AND THE NUMBER OF HYDROXYL AND ETHER GROUPS OF WHICH ARE SUCH THAT THE HLB NUMBER OF THE TRIESTER IS AT LEAST 2 AND BELOW 9. THE AMOUNT OF SAID SURFACE-ACTIVE AGENT BEING AT LEAST ABOUT ONE TWENTIETH OF THE AMOUNT OF SAID HYDROPHOBIC PORTION OF SOLID PARTICLES AND HIGHER DEPENDING ON THE MEAN PARTICLE SIZE OF THE LATTER, AND (C) HYDROCARBON SELECTED FROM THE GROUP CONSISTING OF THOSE SATURATED AND UNSATURATED ALIPHATIC AND CYCLOALIPHATIC HYDROCARBONS OF FROM 3 TO 15 CARBON ATOMS, WHICH HYDROCARBON IS LIQUID AT ROOM TEMPERATURE AND UNDER THE PRESSURE PREVAILING IN SAID AEROSOL DISPENSER, THE AMOUND OF SAID HYDROCARBON BEING AT LEAST ABOUT THE SUM OF 5% BY WEIGHT CALCULATED ON THE WEIGHT OF THE HYDROPHOBIC PORTION OF SAID SOLID AGENT PLU THE HYDROPHOBIC PORTION OF SAID SOLID AGENT PLUS 2.5 TIMES THE DECADIC LOGARITHM OF THE LAST MENTIONED WEIGHT, SAID HYDROCARBON EVAPORATING AT ROOM TEMPERATURE WHEN THE PRESSURE IN SAID DISPENSER IS RELEASED; SAID HYDROPHOBIC PORTION OF SAID SOLID AGENT BEING SUBSTANTIALLY INSOLUBLE IN SAID HYDROCARBON. THE BALANCE OF SAID COMPOSITION CONSISTING ESSENTIALLY OF WATER, AMOUNTING TO AT LEAST ABOUT 60% OF THE TOTAL WEIGHT OF THE COMPOSITION.