Methods for producing stabilized solid thiocarbonate compositions
AssigneeUnion Oil Comany of California
InventorsUnion Oil Company of California, Donald C. Young
Life of this patent
Estimating the term…
Abstract
Encapsulating particles of solid thiocarbonate salts, esters and complexes with air- and water-impermiable coatings produces compositions having long-term stability.
Claims31
A method for making stabilized solid particles of a thiocarbonate selected from the group consisting of alkali and alkaline earth metal tri- and tetrathiocarbonates, and combinations thereof, said method comprising the steps of:
- (1) forming particles of a thiocarbonate selected from alkali and alkaline earth metal tri- and tetrathiocarbonates generally unstable in soil in a water-free medium in which said thiocarbonate is stable and substantially insoluble;
- (2) separating said particles from said medium so that said particles are substantially water-free and in an environment which is substantially free of water, CO.sub.2 and O.sub.2 ;
- and
- (3) dispersing said particles in a matrix selected from the group consisting of water-resistant wax, oil, grease, and combinations thereof in an amount sufficient to increase the stability of said thiocarbonate in soil.
A method for making stabilized solid particles of a thiocarbonate salt of the form:
- M.sub.2 (CS.sub.b).sub.y
- wherein M is selected from the group consisting of alkali metals, alkaline earth metals, and combinations thereof, b is an integer between about 3 and about 5, and y is the valance of M, said salt being generally unstable in soil, said method comprising the steps of:
- (1) forming said particles in a water-free liquid medium in which said thiocarbonate salt is substantially insoluble;
- (2) separating said particles from said medium so that said particles are substantially water-free and in an environment which is substantially free of water;
- CO.sub.2 and O.sub.2 ;
- and
- (3) dispersing said particles in a matrix selected from the group consisting of water resistant wax, oil, grease, and combinations thereof the relative proportions of said thiocarbonate salt and said matrix being sufficient to provide sufficient thiocarbonate to fumigate soil and sufficient matrix to reduce the rate of decomposition of said thiocarbonate salt when said particles are applied to soil.
A method for making stabilized solid particles of a tetrathiocarbonate salt generally unstable in soil, of the form:
- M.sub.2 (CS.sub.4).sub.y
- wherein M is a cationic salt forming moiety, and y is the valence of M, said method comprising the steps of:
- (1) forming said particles in a water-free liquid medium in which said thiocarbonate salt is substantially insoluble;
- (2) separating said particles from said medium so that said particles are substantially water-free and in an environment which is substantially free of water, CO.sub.2 and O.sub.2 ;
- and
- (3) dispersing said particles in a matrix selected from the group consisting of water resistant wax, oil, grease, and combinations thereof the relative proportions of said thiocarbonate salt and said matrix being sufficient to completely encompass said thiocarbonate salt within said matrix and substantially increase the stability of said thiocarbonate salt when said particles are applied to soil.
Dependencies are inferred from the claim text.