Compositions – Preservative agents – Anti-oxidants or chemical change inhibitants
Reexamination Certificate
1999-05-03
2002-05-21
Barr, Michael (Department: 1762)
Compositions
Preservative agents
Anti-oxidants or chemical change inhibitants
C106S002000, C106S006000, C427S008000, C427S393600, C427S407100, C427S412100, C427S412400, C427S416000
Reexamination Certificate
active
06391226
ABSTRACT:
BACKGROUND OF THE INVENTION
a) Field of the Invention
The invention relates to an improved composition for coating or sealing a substrate (especially a floor). This composition presents a high degree of stability during the shelflife and the useful life of the coats or sealers and is advantageously provided with at least one sensor (e.g. a color precursor) that turned colored under determined conditions.
b) Brief Description of the Related Art
It is known in the art that particular attention and a well define methodology is required to properly achieve a uniform and complete stripping of a worn coat or sealer applied on a substrate (such as a floor). Indeed, it is compulsory before applying a new coating or sealer, to completely remove the old one.
Up to now to be sure that all the old coating or sealer is removed it was necessary to repeat a stripping process twice or several times. Each subsequent stripping must be carried out on all the surface of the substrate initially stripped, and this only for the removal of small spots of coat remains or sealer remains that still adhere to said substrate and are very hard for sight detections (even for professionals). Of course, this drawback is still more accentuated for less trained personnel. Said stripping may be carried out with a chemical remover (e.g., an alkaline solution containing organic solvents) and/or with mechanical devices (especially those using floor maintenance pads). Such a repetition of the stripping processes, is time consuming, product consuming and/or energy consuming. Furthermore, repetitive stripping may result into an excessive worn of the substrate (especially when a mechanical action is exerted on the surface of the substrate) that will contribute to shorten the useful life of said substrate. Example of said substrate may consist of wood, vinyl, asbestos, terrazzo, etc.) This means lost of quality and efficiency.
To overcome this drawback, it was proposed in the art to add a chemical sensor directly in sealer and/or coating compositions. More particularly, it was known in the art to embody coating or sealing compositions provided with a color indicator. Examples of such compositions are described in U.S. Pat. Nos. 4,070,510 and 4,071,645.
Sensors that are actually incorporated in sealers and/or floor finish and/or spray buffing solution will be revealed by chemical activators intendedly added and optimized in stripper mixtures or any related floor care product. Both chemical sensors and chemical activators are commercially available in large quantities at reasonable cost and lead times.
It is also possible in the art to use different sensors in the sealer and in the floor finish. An adjustment of the concentration of the stripper mixture could then allow to remove the floor finish while allowing to keep intact the sealer. For example, the use of a cleaner excessively alkaline or concentrated will be immediately revealed by the sensor contained in the floor finish.
However, prior art compositions embedding color indicators show the drawbacks of having a bad stability during the useful life of the coating or sealers. Indeed, these coats and seals show, as a function of time, a deterioration of their optical properties and sensors become to turn colored or fluorescent. Also, sensors may be altered or reacted with constituents of the coating or the sealer, so as they cannot turn colored or fluorescent when put into a determined condition susceptible to transform the sensor into a colored or fluorescent pigment.
Therefore, there is a strong need for a coating or sealing composition (especially a clear coating or sealing composition) that has stable optical properties during its shelf life and its useful life, and that, when sensors are present therein, is still capable of turned colored when necessary (i.e., when it is required to remove it from the substrate covered or sealed) to make easier a complete stripping of the coating or sealer from the coated or sealed substrate.
SUMMARY OF THE INVENTION
A first object of the present invention is to provide a coating composition or sealing composition (advantageously a clear floor finish composition) that will have an extended shelf life and useful life without suffering deterioration of its color (e.g., for the clear floor finish, it remains clear) and, when it contains at least one sensor (for example a color precursor), it is still capable to have its sensor activated to turn colored under determined conditions (for example under an alkaline treatment).
Another object of the present invention is to provide a coating composition or sealing composition (advantageously a clear floor finish composition) that will be very easy to remove completely, once sensor is turned colored after having been subjected to determined conditions.
Another object of the present invention is to provide a composition (advantageously a clear floor finish composition) that improve quality and efficiency of floor are maintenance systems.
Another object of the present invention is to provide the following items:
An efficiency indicator for stripping mixtures.
An indicator to control the washing conditions for floor finishes (to avoid overdosage of alkali in the cleaner).
An indicator to specify the presence of residual floor finish that are normally undetected.
An indicator for different layers of coats on a surface (e.g., different sensors in the sealer and the floor finish, or different sensors between the first and last layers of a coating to reveal and measure the wear of the stack of layers).
A interactive visual monitoring system allowing a reactant normally contained in a maintenance product (e.g. a cleaning formulation obtained from a concentrate) to activate sensors if the dilution of the concentrate is unsufficient, or a reactant normally contained in a stripping solution to reveal the identity of a coat located at the top of a stack of coats. This interactive visual monitoring system may further allow to measure, specify, reveal and control visually (instantly or periodically) the quality of a work (e.g. a stack of coatings on a floor) without requiring additional investment and while respecting modern application techniques, the intervening parties and the environment.
A visual monitoring system that is very simple, unavoidably leads to a job well done with a higher accuracy, a sustained productivity and substantial saves, and allows a reduction of the burden of employees and allows an efficient self control.
Means for rendering safer the stripping processes by revealing the presence of emulsions on the floor (which is slippery).
An indicator for applying a floor finish (the floor finish is colored when applied and turns clear when set).
An indicator where a pressure was applied on the floor finish (thanks to sensors activated by pressure).
Sensors may be used in connection with a wide variety of products, such as stripping mixtures, floor cleaners, surface neutralizers, soaps (e.g., hand soaps, shower soaps, ect.), disinfectants, dishes or clothes cleaning products, industrial products.
Another object of the present invention is to provide a coating composition or sealing composition that is stable for a period of at least one year with respect to the characteristics thanks to the incorporation therein of at least one chemical and/or UV stabilizer and/or antioxidant. Preferably, this stability is noted for temperatures ranging from −18° C. to 50° C.
Another object of the present invention is to provide a layer of coating or sealing or a stack of layers of coating or sealing, each layer being obtained by applying a composition according to the invention on a substrate by any appropriate means, said layer being stable for a period of at least one year with respect to the characteristics thanks to the incorporation in each layer of at least one chemical and/or UV stabilizer and/or antioxidant.
Examples of means suitable for applying a coating according to the invention may be selected from the group consisting of brushes, roller applicators, flat mops, floor clothes, clothes,
Chauvette Gaetan
Hamelin Richard
Legendre Fran{tilde under (c)}ois
Trudeau Guy L.
Barr Michael
Darby & Darby
Laboratoires Choisy LTEE
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