Process of Three Dimensional Lithography in Amorphous Polymers.
Patent, Filed 29 Nov 89, patented 27 Aug 91,
DEPARTMENT OF THE NAVY WASHINGTON DC
Pagination or Media Count:
A process of three dimensional lithography in amorphous polymers to form an instantaneous, permanent image in the polymer by the steps of providing an undoped, non-crystalline layer or film of a polymer having a stable amorphous stat under human operating conditions. Thin film is preferably polyethyleneterphthalate PET, polyaryl-ether-ether-ketone PEEK, polychloro-trifluoroethylene Kel-F, polycarbonate ie LEXAN 9032, polysulfone, polymethylmethacrylate PMMA, or LUCITE, a poly cyanurate such as bisphenol A dicyanate, or an epoxy eg. Epon 820. The film can be either self supporting or mounted on a substrate. The film is then covered and optionally contacted with a mask which serves to block the radiation from impinging on where no marking is desired. If the mask is in actual contact with the film, it is capable of also acting as a heat sink. Next, the film is exposed through the mask to radiation of sufficient intensity to cause ablation of the exposed areas of imparting a distinct, three-dimensional impression in the film.
- Polymer Chemistry