Drug – bio-affecting and body treating compositions – Designated organic nonactive ingredient containing other... – Solid synthetic organic polymer
Patent
1990-04-05
1994-06-14
Page, Thurman K.
Drug, bio-affecting and body treating compositions
Designated organic nonactive ingredient containing other...
Solid synthetic organic polymer
5147724, A01N 2510
Patent
active
053210492
DESCRIPTION:
BRIEF SUMMARY
This invention relates to agricultural compositions, and in particular to herbicidal, fungicidal and insecticidal compositions (hereinafter referred to as pesticidal compositions) for both pre-emergence and post-emergence application.
It is generally desired of such pesticidal compositions that they should be easy to handle, and easy to apply in any desired concentration. For this reason, herbicidal compositions are generally supplied in the form of wettable powders, emulsifiable concentrates and the like. In the formulation of emulsifiable concentrates, it is generally necessary to incorporate substantial quantities of organic solvents, and this can result in substantial problems of dermal toxicity and flammability. Furthermore, because of the presence of organic solvents, it is not possible, for many emulsifiable concentrate compositions, to utilize containers of conventional plastics materials, such as high density polyethylene (HDPE). Instead, such concentrates have to be contained within specially designed containers, which are resistant to the solvents used. In addition, the incorporation of high levels of organic solvents in emulsifiable concentrates gives rise to problems of phytotoxicity to crops when the pesticidal substances are utilized.
EP-A-0080516 (Dow), discloses insecticidal compositions, in which the active substance is incorporated within particles of a latex, and that thereby water-borne dispersions may be prepared. These prior art disclosures are however restricted to the use of specific insecticides, chlorpyrifos and chlorpyrifos-methyl, and the disclosure indicates that it is essential that the pesticide utilized is either a liquid or a low-melting solid at ambient temperatures, so that it can be solubilized into the polymer at temperatures less than 100.degree. C. as a liquid.
Furthermore, although the method disclosed in EP 0080516 enables the preparation of latex-containing compositions of chlorpyrifos, its method requires that the active substance should be heated to 60.degree. C. for 2 hours. This is both inconvenient to carry out industrially, and can give rise to thermal degradation of the chlorpyrifos.
In addition the method is very unsatisfactory with pesticides which have a somewhat higher melting point.
GB-A-2072506 (Desowag-Bayer) is concerned with a film-forming wood preservative concentrate substantially free of inorganic salts or pigments. The compositions disclosed therein comprise an insecticide or fungicide, a water insoluble solvent, and a water-dilutable aqueous plastics dispersion which may be a polymer or copolymer of a vinyl ester, an acrylic acid ester, or a methacrylic acid ester. The compositions also comprise from 0 to 2% of an emulsifier. Although the compositions are somewhat dilutable in water (up to 1:4), the compositions are not in the nature of suspension concentrates, i.e. ones which are essentially infinitely dilutable (particularly diluable up to at least 50:1) in water. This is not surprising when it is considered that the essential characteristic of the compositions of the reference is that they contain drying oils and/or an alkyd resin. They are thus in the nature of paints, for application to timber and the like and the purpose of the latex in the composition is to act as a film-former.
It is inconsistent with the latex acting as film-former that high levels of surfactant should be present, and in particular that a sufficient amount of surfactant should be present to enable the compositions to be essentially infinitely dilutable with water). It is well known that the presence of surfactants will interfere with the film forming properties of latex dispersions such as are described in GB-A-2072506, such that incomplete and non-adhesive deposits will be produced, and not the continuous adherent films which the Patentees seek to produce.
It is also to be noted that none of the compositions specifically disclosed in the reference actually contain any added surfactant. Many commercially available latex compositions contain levels of surfactant of 0.5
REFERENCES:
patent: 3400093 (1968-09-01), Feinberg
patent: 4818536 (1989-04-01), Meyers et al.
Basic Abstracts Journal, Section C, week K23, Aug. 3, 1983, No. 55173, Derwent Publications.
Cuffe John
Mulqueen Patrick J.
Paterson Eric S.
Smith Geoffrey W.
DowElanco
Jones S. Preston
Levy N.
Page Thurman K.
LandOfFree
Agricultural compositions containing latexes does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Agricultural compositions containing latexes, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Agricultural compositions containing latexes will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1249582