Coating processes – Removable protective coating applied
Reexamination Certificate
1995-06-07
2001-11-20
Reddick, Judy M. (Department: 1713)
Coating processes
Removable protective coating applied
C427S155000, C427S156000, C428S411100, C428S500000, C428S511000, C428S514000, C428S480000, C428S481000, C524S386000, C524S388000
Reexamination Certificate
active
06319548
ABSTRACT:
TECHNICAL FIELD
The present invention relates generally to coatings used to protect glass and glass-like surfaces from paint or similar treatments. More specifically, the present invention relates to a cohesive coating having a high adhesion to non-glass surfaces and a low adhesion to glass-like surfaces so that once dry, the coating may be pulled off the glass in a continuous strip.
BACKGROUND ART
When painting window frame and trim materials there is always the attendant problem of keeping the paint off the glass, while at the same time in order to protect the frame or trim from moisture, sealing the juncture between the trim and the glass with paint. Normally, the paint is applied in a narrow band on the glass surface adjacent the trim, but this method can be difficult and time-consuming, requiring an inordinate painting skill. Another less exacting method involves painting along the trim-glass junction, sometimes onto the glass, sometimes shy of the glass. While this method may be faster than the previous method, it leaves the trim-glass juncture in an unsealed state. In such cases rain water or indoor condensation will seep into the unprotected interface and eventually cause destruction of the trim materials by rotting or cracking. Also the old paint at the interface will be dried and cracked, thus allowing moisture to seep in at the interface and eventually lift the putty away from the glass to enhance further water penetration.
Still other methods include painting at will on the glass surface or window pane while painting the trim. A scraper or razor blade must then be used to remove the paint. Ordinary latex paint can be scraped off within hours after being applied, but after that short period it will adhere to the glass strongly. When dry, ordinary paint is not a particularly “cohesive” coating and, as such, will then break up, or fracture, when subjected to the sheer forces of the scraper. When paint dries too thoroughly, it must be removed in small pieces, a time-consuming task which often damages the glass.
Yet another method involves masking. With masking, an adhesive coating or tape is placed on the window pane, prior to installation or after installation, so that the trim or frame material can be painted quickly and without regard to the juncture between glass and trim since any excess paint will be applied to the protective coating. This method, however, again requires the time-consuming operation of carefully applying the adhesive coating so that it lines up with and abuts the glass-trim juncture.
To summarize the drawbacks of the above-mentioned methods for protecting window pane glass during a trim or frame painting operation, it will be seen that a high labor commitment is required, involving increased expense, or in the absence of skilled labor, sloppy work in the form of uneven edges of paint residue along the trim-glass interface or juncture, especially after spray painting (and including concrete splatter on the window glass during new construction), or in the case of applying a protective coating for the glass, the time consuming step of applying masking tape or other protective adhesive coating to square up exactly with the glass-trim interface, in which case paint can be drawn under the edge of the tape or coating at the interface by capillary action.
DISCLOSURE OF INVENTION
Accordingly it is an object of the present invention to provide an improved masking composition.
Another object of the present invention is to provide a masking composition that can be applied using conventional paint application techniques.
Another object of the present invention is to provide a cohesive protective coating which may be applied to glass and non-glass surfaces such as window panes and trim prior to painting, and after painting will adhere to the trim but will lift easily off the glass leaving the glass paint free.
Another object of the present invention is to provide a protective coating which is easily and quickly applied to window trim and the adjacent window pane before painting and easily removed from the glass after painting.
Yet another object of the present invention is to provide a protective coating which is highly cohesive in that it does not break up, or fracture, when subjected to the sheer forces of pulling or scraping the coating off glass-like surfaces.
Another object of the present invention is to provide a protective coating which when applied to window trim and adjacent window panes remains supple and easily removable from the glass for a sufficient amount of time after application to allow for delays in applying paint or other treatments to the window trim.
Yet another object of the present invention is to provide a protective coating which, when applied to non-glass surfaces, may be painted with most paints, including both alkyd and latex paints and will adhere strongly to the non-glass surface.
Another object of the present invention is to provide a protective coating which, when applied to window trim and adjacent window panes, will seal the trim-glass juncture.
Another object of the present invention is to provide a protective coating which can be applied efficiently by relatively unskilled laborers and still produce professional-looking results when painting non-glass surfaces adjacent to glass surfaces.
Yet another object of the present invention is to provide a protective coating which can be applied to glass and can be used to display indicia such as the glass manufacturer's logo, installation instructions, and the like.
Yet another object of the present invention is to provide a protective coating which may itself be used as a paint on any material adjacent to a glass-like surface.
Yet another object of the present invention is to provide an improved method for applying paint to non-glass materials adjacent glass-like surfaces.
Another object of the present invention is to provide a protective coating which has application to a DAC (differential adhesion composition) coating product and may be used to coat any dissimilar and juxtaposed surfaces where one is a surface to be treated such as a non-glass surface whether painted or not, and the other is a glass-like or glazed ceramic surface.
The above and other advantages of the present invention are carried out in one form by a coating composition comprising a resin emulsion having low adhesion to glass-like surfaces and high adhesion to non-glass materials.
The above and other advantages of the present invention are carried out in another form by a method for painting a non-glass material adjacent a glass-like surface with a coating composition having selective adhesion to glass-like surfaces and high adhesion to the non-glass material. The method calls for painting the non-glass material with the coating composition without regard for painting the glass-like surface at the same time. Later, the method calls for lifting the coating composition from the glass-like surface adjacent the non-glass material. The coating composition may itself be a paint, a primer, or a clear coating.
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Goltry Michael W.
Parsons Robert A.
Parsons & Goltry
Reddick Judy M.
The Trimex Company
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