UV shield

DETAILED DESCRIPTION OF THE INVENTION The composite film 10 is made up of various layers or plies.
The part of the film which contacts the structural member of the window 20 or faces the source of the UV has a pressure sensitive adhesive coating 1 or other means for affixing the film to the structural member.
The adhesive is compatible with the material of the structural member 20 and the film ply 2 upon which it is coated.
For example, the adhesive may be an acrylic or urethane pressure sensitive adhesive or a polyester, if the structural member is glass.
The pressure sensitive adhesive is initially covered by a conventional release liner 30 which covers the adhesive until it is removed prior to use of the film.
The pressure sensitive adhesive is laminated onto one surface of layer 2 of polyethylene terephthalate (PET) film.
While PET is preferred, the film layer could be a polyester or polycarbonate.
The film contains a dye and a UV absorber.
The dye merely tints the film to a desired color.
It may be omitted.
The preferred UV absorber for this film is 2,2'-Dihydroxy-4,4-methoxy benzophenone.
Alternative compounds include other compatible members of the benzophenone family and compatible members of the benzatriazole family.
To the opposite surface of this layer 2 is affixed a layer 3 of laminating adhesive.
The laminating adhesive 3 is a polyester resin crosslinked with an isocyanate.
Alternative compositions could be acrylic pressure sensitive adhesives or uncrosslinked PET.
The laminating adhesive 3 contacts and fixes another layer 4 of PET containing a dye and a UV absorber.
Film layers 2 and 4 may be identical or similar in make up.
Coated onto the outer surface of the layer 4 is a scratch resistant layer 5.
This layer serves to protect the film from damage through normal wear and tear.
The preferred scratch resistant coating is a hard acrylic polymer.
The term, "hard," does not necessarily denote stiffness but refers to a surface that is not easily marred.
Other compositions which form protective layers include urethanes and certain inorganic chemical materials