Solid state thermosensitive polymer compositions

DETAILED DESCRIPTION OF THE INVENTION Representative devices and apparatus useful in this invention are disclosed in U.
S.
Pat.
Nos.
4,260,225; 4,085,999; 4,082,892 and 4,307,942, all of which are incorporated herein by reference in their entirety.
That is, devices useful herein comprise, for example, two generally transparent panels or layers which are separated from one another.
Typically, the panels or layers are glass or plastic panes or sheets which are spaced apart from one another by a device such as a frame.
The panels or layers can be treated materials which darken when exposed to light and/or radiation or which contain radiation reflective materials.
The region between the panels contains the aforementioned thermal radiation suppressor compositions, typically in the form of a sheet or film between the panels.
Alternatively, thermal radiation suppressor compositions can be employed as are typical thermoplastic sheets or films.
The thermoplastic substance in intimate contact with the other composition generally is in the form of a blend of materials, and in particular a blend of polymeric materials.
The term "blend" as employed herein in referring to blends of polymeric materials refers to those substantially solid mixtures of two or more polymers which are commonly referred to in the art as polymer blends or polymer alloys.
The terms "compatible blend" or "miscible blend" and like terms, are not necessarily employed in the strict sense as meaning that the blend exhibits a single glass transition temperature, but instead is used to describe a blend which exhibits properties, especially physical properties, which are at least intermediate to those of the component polymers.
Compatible blends can be employed to provide tough pliable films or sheets of thermoplastic radiation suppressor composition.
By contrast, an "incompatible blend" or "immiscible blend" as used herein, refers to a blend which exhibits properties which are significantly poorer than those of the component polymers, especially significantly poorer than the thermoplastic polymeric material