Method for making PEN/PMMA multilayer optical films
a multi-layer optical film and multi-layer technology, applied in the field of apparatus and processes for making polymeric multi-layer films, can solve the problems of inability to use the films made with the materials and processes described heretofore, the birefringence of the copen resin is reduced, and the device is difficult and costly to manufactur
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[0022] Various process considerations are important in making high quality polymeric multilayer optical films and other optical devices in accordance with the present invention. Such optical films include, but are not limited to, interference polarizers, mirrors, colored films, and combinations thereof. The films are optically effective over diverse portions of the ultraviolet, visible, and infrared spectra. Of particular interest are coextruded polymeric multilayer optical films having one or more layers that are birefringent in nature. The process conditions used to make each depends in part on (1) the particular resin system used and (2) the desired optical properties of the final film.
[0023] A preferred method of making the multilayer film of the present invention is illustrated schematically in FIG. 1. Materials 100 and 102, selected to have suitably different optical properties, are heated above their melting and / or glass transition temperatures and fed into a multilayer feed...
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