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
1999-04-05
2001-09-11
Dawson, Robert (Department: 1712)
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...
C524S409000, C524S502000, C524S544000, C525S100000, C525S101000, C525S474000, C427S387000, C428S446000, C428S447000, C106S002000
Reexamination Certificate
active
06288163
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a paint composition and is particularly concerned with an paint composition which is repellent against graffiti.
BACKGROUND OF THE INVENTION
Graffiti damage has been an increasingly growing concern. The term graffiti has lost it's historical meaning and has acquired a negative tone to it. Today most people view graffiti not as an art form but as a form of vandalism and property destruction. Graffiti is mostly found in institutions such as schools, public and private buildings, automobiles, trucks, trains, cars and public rest rooms and, in open areas such as support walls for bridges, inner walls of buildings and park structures. The vast majority of graffiti are created with oil-based paints including enamels, epoxies, lacquers and urethanes, which are applied by spray cans.
Conventionally, removal of unwanted graffiti has been performed by sandblasting the graffiti from the substrate. However, this method is expensive and hazardous to health due to the emission of potential carcinogenic particles. Moreover, the method causes damages to the paint surface. No long term solutions are offered by the use of this method and the surface will likely be repainted with new graffiti damages.
Another method commonly used is by treating the substrate with chemicals. In this case, the chemicals often destroy the surface and, are generally hazardous as they require handling with highly caustic solutions.
In an attempt to overcome many of the problems associated with sandblasting and chemical methods, it has been common practice to apply a protective coating on top of the paint or to use a paint which has anti-adhesive properties against graffiti. However, such coatings or paints have a slow final curing time. Also, they are too soft and is often damages by the paint removers which are used to remove the graffiti. Another disadvantage is that such coatings and paints do not age well, and with time will often become sticky and pick up dirt.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a paint composition which is repellent against graffiti and which is not sacrificial.
In accordance with one aspect of the present invention, there is provided a paint composition comprising:
(a) from about 1 to about 41% by volume of a silicone selected from the group consisting of silicone rubber and silicone oil; and
(b) the balance comprising a paint.
Preferably, the amount of silicone in the paint composition is from about 1 to about 35% by volume, and most preferably from about 10 to about 25% by volume. The silicone rubber may be silicone caulking (non-paintable), and the paint may be a clear or colored paint, or a mixture thereof. The paint may be water-based, solvent-based or oil-based, preferably, the paint is water-based.
The paint composition may further include from about 1 to about 41%, and preferably, from about 1 to about 35% and, most preferably from about 10 to about 25% by volume of mineral spirits. Generally, the ratio of silicone to mineral spirits is about 1:1.
The paint composition may further include from about 5 to about 15% by volume of additives. Suitable additives are polytetrafluoroethylene, UV sunscreens, color pigments and liquid cement.
In accordance with another embodiment of the present invention, there is provided a paint composition comprising:
(a) from about 1 to about 41% by volume of a silicone selected from the group consisting of silicone rubber and silicone oil;
(b) from about 1 to about 41% by volume of mineral spirits;
(c) from about 5 to about 15% by volume of additives; and
(d) the balance comprising a paint.
In accordance with another aspect of the present invention, there is provided a paint composition comprising:
(a) about 20% by volume of silicone caulking;
(b) about 20% by volume of mineral spirits; and
(c) the balance comprising an industrial clear paint.
In accordance with another aspect of the present invention, there is provided a topcoat comprising:
(a) about 10% by volume of silicone caulking;
(b) about 10% by volume of mineral spirits;
(c) about 5% by volume of a liquid cement;
(d) about 25% by volume of an industrial clear paint; and
(e) about 50% by volume of a colored paint.
In accordance with another aspect of the present invention, there is provided a cement paste comprising:
(a) from about 1 to about 41% by volume of a silicone selected from the group consisting of silicone rubber and silicone oil; and
(b) the balance comprising a liquid cement.
Preferably, the liquid cement is in an amount of 60% by volume of the total volume of the cement paste. The cement paste may further include from about 1 to about 41% of mineral spirits and from about 5 to about 15% of additives.
In accordance with another aspect of the present invention, there is provided a method for removing graffiti from a substrate comprising:
(a) applying at least one layer of a primer-sealer onto the substrate;
(b) applying at least one layer of a topcoat comprising:
(i) from about 1 to about 41% by volume of a silicone selected from the group consisting of silicone rubber and silicone oil; and
(ii) the balance comprising a mixture of a clear paint and a colored paint; and
(c) applying at least one layer of a clear coat comprising:
(i) from about 1 to about 41% by volume of a silicone selected from the group consisting of silicone rubber and silicone oil; and
(ii) the balance comprising a clear paint.
The silicone rubber may be silicone caulking. Preferably, the amount of silicone caulking is about 10% by volume in the topcoat and about 20% by volume in the clear coat. The topcoat and clear coat may further include from about 1 to about 41% by volume of mineral spirits and, from about 5 to 15% of additives such as liquid cement and UV protectors.
The advantages of the paint composition of the present invention are that it has a quick final curing time, is not sacrificial and is safe to use in contrast to epoxy coatings.
REFERENCES:
patent: 4280947 (1981-07-01), Mori
patent: 5039745 (1991-08-01), Riddle
patent: 5811483 (1998-09-01), Close
patent: 2469437 (1981-05-01), None
patent: 2537985 (1984-06-01), None
patent: 2630353 (1989-10-01), None
patent: 2684682 (1993-06-01), None
English abstract of JP 08041386 A Sato et al., Feb. 1996.*
English abstract of JP 05078617 A Masioka Mar. 1993.
Dawson Robert
Robertson Jeffrey B.
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