Compositions – Preservative agents – Anti-corrosion
Patent
1980-09-02
1984-03-27
Lovering, Richard D.
Compositions
Preservative agents
Anti-corrosion
71 6408, 71DIG1, 106 10, 106243, 252 11, 252 495, 252311, 424170, 424358, 426811, 524230, 524801, B01J 1300, C08L 3104, C08L 3308
Patent
active
044393440
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
Heretofore water has not been used successfully as the carrier for numerous preparations designed to provide a continuous unbroken smooth film when applied upon a work surface. Exemplary of such preparations are rust-proofing compounds of wax, oil, or silicone bases which are currently applied in various forms utilizing non-aqueous solvents. Petrochemicals serve as the primary solvents for such compounds. Mold releases comprised of oils, animal or vegetable fats, such as lecithin or polydimethylsiloxanes constitute another example of preparations which to the present time have been applied by means of similar non-aqueous solvents. Various adhesives form a further class of compositions which have been consistently carried in other than water solvents; particularly those requiring quick tackification. A still further category is constituted of the stain-proofing compounds, especially those formed of telefluoromer resins, wherein expensive and toxic chemicals have been the solvents of choice. The foregoing merely illustrate the exceedingly wide range of preparations which have been to the present time reduced to solutions for coating application and all of which have eschewed the use of water as the carrier.
It is recognized that many active ingredients for film formation may be emulsified, but to date emulsion technology has not been satisfactory for providing a continuous film in an efficacious manner. Shortcomings of existing emulsion technology are two-fold:
(a) Those relating to oil in water have failed because the hydrophobic active ingredients must of necessity be in the oil phase and in this type of emulsion water is the continuous phase. Consequently, there is no molecular continuity of the active ingredient so that the resultant film would be discontinuous with uneven distribution of the active ingredient. An example would be the commercial silicone emulsions which are basically low viscosity polydimethylsiloxanes emulsified in water and in these emulsions the water is on the outside or in the continuous phase. Attempting to use such an emulsion as a mold release, for example, would have disappointing results because the silicone would be distributed unevenly upon the applied surface and the compound would not serve to bring about reliable mold release.
(b) Those resultant from water in oil are due to the altered nature of the active ingredient. Though the active ingredients are in the continuous phase by the nature of the present emulsion technology, these active ingredients are altered by the presence of water and/or emulsifiers and their performance is not what would be expected should such have been applied in pure form or in solvent reduction. The active ingredients as applied are altered in appearance from the pre-emulsion state. For instance, active ingredients which have been transparent become pasty or creamy; resultant applications have been disappointing. Exemplary of this would be to prepare a silicone emulsion wherein the silicone would be in the oil or continuous phase and attempt to use this as a mold release. Experience has shown that although the distribution of the silicone may be even and continuous in this type of emulsion, the presence of the water and/or emulsifiers severely limits the release effect of the silicone. These compounds simply have not worked. When applied the silicone emulsion is paste-like or creamy in appearance and not characteristic of the transparent quality of polydimethylsiloxane which would be the preferred appearance.
It is indeed apparent that the failure heretofore to utilize water as a carrier for film or coating forming agents has necessarily brought about costly development of commercial solvents with the attendant drain of fossil fuel reserves. Very few of the solvents used currently are without real or potential hazard as the same involve inherent peril factors such as caused by toxicity levels and flammability.
Therefore, it is an object of the present invention to provide a preparation which is water base and which in application is
REFERENCES:
patent: 2887460 (1959-05-01), Dibert et al.
patent: 3039969 (1962-06-01), Colucci et al.
patent: 3244638 (1966-04-01), Foley et al.
patent: 3929492 (1975-12-01), Chapman et al.
Lovering Richard D.
United Industries Corporation
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