Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Reexamination Certificate
1999-03-15
2002-06-25
Reddick, Judy M. (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
C524S247000
Reexamination Certificate
active
06410632
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATIONS
NOT APPLICABLE
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
NOT APPLICABLE
REFERENCE TO A MICROFICHE APPENDIX
NOT APPLICABLE
BACKGROUND OF THE INVENTION
The subject matter of the claimed invention pertains to a method for suspending borate particles in aqueous dispersions; in other words a method for a stable aqueous borate formulation. The ability to prepare an aqueous formulation in which there is no settling is necessary in flowable chemistry.
Flowable formulation chemistry is widely practiced in the agricultural chemical industry where active chemicals have limited solubility in water. Liquid chemical formulations are preferred to crystals and powders for many reasons not the least of which is easier handling of liquids.
The borate chemical claimed—sodium tetraborate decahydrate, is marketed as crystal or powder formulations. There have been many attempts to produce aqueous flowable borate compositions using techniques and reagents known to those skilled in the art of agricultural flowable chemistry. None of these attempts achieved commercial success because the techniques and reagents used did not prevent the borate particles from settling in aqueous dispersion.
The suspending reagent claimed, an acrylic emulsion trade named Rhodoline 1560, is marketed as a thickening agent for use in paints. It is known to increase the viscosity of paint formulations when the pH in those compositions is greater than 7. Rhodoline 1560 is marketed by Rhodia, 259 Prospect Plains Road, Cranbury, N. J. 08512.
BRIEF SUMMARY OF THE INVENTION
My invention teaches a method for suspending borate particles in aqueous dispersions which comprises blending in water 20 to 60 parts of a borate compound consisting of sodium tetraborate decahydrate, with from 2 to 20 parts of an acrylic emulsion trade named Rhodoline 1560, then adjusting the pH between 7 and 12 using an alkaline reagent. It is the object of my invention to provide a method for preparing aqueous borate formulations which are sufficiently free of settling to be marketed as liquid flowable compositions.
DETAILED DESCRIPTION OF THE INVENTION
In the preferred embodiment of my invention the borate compound, the Rhodoline 1560, and the alkaline reagent are chosen and used at concentrations within the limits claimed so as to produce a dispersion which handles easily through commercial pumps in addition to resisting settling. Those skilled in the art will understand the possibility of including chemicals in additions to those claimed in these formulations. In the preferred embodiment, preparation of dispersions according to the method of my invention is accomplished by adding water first, the borate compound second, the Rhodoline 1560 third, and finally the alkaline reagent, all while blending the mixture.
Any borate crystal or powder formulation may be used in the preparation; but powders produce more free flowing dispersions. The alkaline reagent may be a pure chemical or a mixture. Sodium hydroxide and ethanolamine are preferred alkaline reagents because of their availability and relatively low cost. The preparations according to my method invention are used in the same manner and for the same purposes as the borate crystals or powders from which they are prepared.
REFERENCES:
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