Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Adhesive outermost layer
Reexamination Certificate
1999-02-19
2001-08-07
Zirker, Daniel (Department: 1771)
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Adhesive outermost layer
C428S354000, C428S412000, C428S461000, C428S463000, C428S522000
Reexamination Certificate
active
06270887
ABSTRACT:
TECHNICAL FIELD
The invention herein resides in the art of film covers for window plates. More particularly, the invention relates to a light reflective and ultraviolet absorptive film cover for windows. Specifically, the invention pertains to a breathable film cover for polycarbonate or polyacrylate plate windows exhibiting light reflective and/or ultraviolet absorptive characteristics.
BACKGROUND ART
It is well known in the art to employ metalized polymeric films to cover glass plates in window structures. Typically, these films are employed to filter ultraviolet (UV) light and/or to reflect light from the window plate. Typically, the polymeric film is one of polyester, polyethylene, polypropylene or the like. While such film covers have proven to be effective in the past for covering and filtering/reflecting light from glass panels, there are materials other than glass which are presently being used for window panels and panes. Presently, plastic material such as polycarbonate and polyacrylate are being used as the primary window structure. These materials are strong, light weight, shatter proof and of high clarity, serving well for window structures, and particularly in skylights, verandas, sun rooms, and the like.
It has been found that when the prior art metalized polymeric films are attached to polycarbonate or polyacrylate plates, problems develop. Specifically, bubbles, craters, or tunneling appears when the metalized film is applied to such plastic plates. It has come to be found that plastic plates such as those of polycarbonate and polyacrylate contain moisture that creates such defects at the interface of the adhesive and the plate when the plate loses its inherent moisture. The moisture escape is termed degasification. These defects appear because the polymeric film used for such applications is impervious to moisture, providing an excellent barrier against moisture transfer. Being impermeable to the escaping moisture, the objectionable bubbles, craters and tunnels develop at the interface between the film and the plastic plate.
In view of the fact that it is desirable to employ polycarbonate and polyacrylate plates for certain window structures, and in further view of the fact that such window structures often require the implementation of reflective and/or filtering films, there is a need in the art for a metalized polymeric film which is breathable and capable of adhering to polycarbonate and polyacrylate plates without the development of bubbles, craters or tunnels as a result of degasification of the plate material.
DISCLOSURE OF INVENTION
In light of the foregoing, it is a first aspect of the invention to provide a breathable film cover for window structures.
It is another aspect of the invention to present a breathable film cover for window structures which is particularly adapted for implementation with polycarbonate and polyacrylate plates.
Still a further aspect of the invention is the provision of a breathable film cover for window structures having light reflective and filtering capabilities.
Yet an additional aspect of the invention is the provision of a breathable film cover for window structures which is efficient, effective, and conducive to implementation with state of the art materials.
The foregoing, and other aspects of the invention which will become apparent as the detailed description proceeds are attained by the implementation of a plasticized polyvinyl chloride film having a metalized coating thereon and adhesively attached to a polycarbonate or polyacrylate plate by means of an ultraviolet absorptive adhesive.
BRIEF DESCRIPTION OF THE DRAWING
For a complete understanding of the objects, techniques and structure of the invention reference should be made to the following detailed description and accompanying drawing wherein a cross-sectional view of a window structure of polycarbonate or polyacrylate is shown with a breathable film cover adhered thereto in accordance with the invention
REFERENCES:
patent: 4361625 (1982-11-01), Beckmann et al.
patent: 4550058 (1985-10-01), Collins et al.
patent: 5258232 (1993-11-01), Summers et al.
patent: 5861211 (1999-01-01), Thakkar et al.
Pasti Claude
Stocq Robert G.
Morgan Adhesives Company
Renner Kenner Greive Bobak Taylor & Weber
Zirker Daniel
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