Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Reexamination Certificate
1995-01-18
2001-04-10
Williamson, Michael A. (Department: 1616)
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
C428S325000, C428S327000, C428S212000, C428S040100, C428S202000, C428S904400, C428S906000, C428S352000, C428S354000, C428S208000, C428S095000, C428S096000, C428S208000
Reexamination Certificate
active
06214453
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a decorative sheet which is affixed to an exterior wall surface for decorative and protective purposes.
2. Description of the Prior Art
Conventionally, an exterior wall surface of a building is most typically treated by directly applying a painting or coating material to the surface by means of a spray gun. However, the spray gun method is likely to result in poor appearance due to unevenness of the coating thickness and/or color in addition to giving rise to a pollution problem. Further, the spray gun method is also disadvantageous in that the coating work is greatly influenced by the weather.
To solve the problems of the spray gun method, it has been proposed to use decorative sheets for covering an exterior wall surface of a building. Various kinds of exterior decorative sheets are known, but they are equally impermeable to air and moisture. Indeed, due to the outside use (particularly in consideration of rain), the designing emphasis is placed mainly on durability, and no or little attention has been ever paid to the necessity of imparting an air- and moisture-permeability to the exterior decorative sheet, as opposed to a decorative cloth for an interior wall surface.
When such a decorative sheet is affixed to an exterior wall surface, there is a tendency of locally trapping air between the sheet and the wall surface due to its inability of allowing air passage. As a result, the sheet will be locally bulged in addition to being likely to come off the wall surface. This problem becomes particularly remarkable when the exterior wall surface has projections and depressions.
Further, the prior decorative sheet is known to be relatively hard and heavy. As a result, it is rather difficult to adapt the sheet to corner or bent or undulated portions of an exterior wall surface, and the sheet is likely to displace gravitationally on a vertical wall surface.
SUMMARY OF THE INVENTION
It is, therefore, an object of the present invention to provide a decorative sheet which can be conveniently affixed to an exterior wall surface, even corner or bent or undulated portions thereof, without trapping air between the sheet and the wall surface, thereby providing an improved appearance while also preventing unexpected removal from the wall surface.
According to the present invention, there is provided a decorative sheet for a wall surface comprising a flexible nonwoven fabric which is permeable to air and moisture, and a coating layer formed on a front surface of the nonwoven fabric, the coating layer being also flexible and permeable to air and moisture after drying.
The nonwoven fabric may be preferably made of at least one material selected from the group consisting of polyester fibers, polypropylene fibers, polyethylene fibers, nylon fibers, acrylic fibers, rayon fibers, acetate fibers and vinylon fibers.
On the other hand, the coating layer may be advantageously made of a coating material which is prepared by mixing at least one matrix with at least one additive. The matrix may be preferably selected from the group consisting of acrylic resin, copolymerized acrylic rubber, copolymerized butadiene rubber, vinyl resin, urethane resin, silicone resin and flurocarbon resin, whereas the additive may be preferably selected from the group consisting of natural stone powder, fine particles of natural stone, artifitially colored particles of natural stone, fine particles of foaming agent, ceramic powder, glass powder, fine plastic particles and pigment.
In one embodiment of the present invention, the coating layer is releasably covered by a stretchable plastic film, so that the coating layer is prevented from being soiled or stained at the time of affixing the decorative sheet. Further, the nonwoven fabric has a rear surface formed with a uniform adhesive layer which is permeable to air and moisture, and the adhesive layer is covered by a releasable paper layer.
In another embodiment, the nonwoven fabric has a rear surface which may be formed with a mesh adhesive pattern. Alternatively, the rear surface of the nonwoven fabric is formed with a comblike adhesive pattern or a stripe adhesive pattern.
Other objects, features and advantages of the present invention will be clearly understood from the following description of a preferred embodiment given with reference to the accompanying drawings.
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Rose, The Condensed Chemical Dictionary, 1966, pp. 842-843.
Bednarek Micheal D.
Pittman Shaw
Toyokasei Co., Ltd.
Williamson Michael A.
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