METHOD FOR MAKING PEN/PMMA MULTILAYER OPTICAL FILMS
First Claim
1. A method for making an article, comprising:
- making a multilayer optical film having alternating polymeric layers formed by coextrusion; and
incorporating an antistatic additive into the multilayer optical film;
wherein making the multilayer optical film comprises;
providing at least a first stream of resin and a second stream of resin;
providing a feeder tube plate having a first plurality of conduits, and a second plurality of conduits interleaved with the first plurality of conduits;
feeding the first stream into the first plurality of conduits and the second stream into the second plurality of conduits;
providing a slot die for each of the first and second plurality of conduits such that the first and second streams are divided into a plurality of interleaved layers to yield a composite stream;
passing the composite stream through an extrusion die to form a multilayer web in which each layer is generally parallel to the major surface of adjacent layers; and
heating the first and second streams of resin with at least one axial rod heater.
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Accused Products
Abstract
Methods and apparatuses are provided for the manufacture of coextruded polymeric multilayer optical films. The multilayer optical films have an ordered arrangement of layers of two or more materials having particular layer thicknesses and a prescribed layer thickness gradient throughout the multilayer optical stack. The methods and apparatuses described allow improved control over individual layer thicknesses, layer thickness gradients, indices of refraction, interlayer adhesion, and surface characteristics of the optical films. The methods and apparatuses described are useful for making interference polarizers, mirrors, and colored films that are optically effective over diverse portions of the ultraviolet, visible, and infrared spectra.
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Citations
13 Claims
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1. A method for making an article, comprising:
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making a multilayer optical film having alternating polymeric layers formed by coextrusion; and incorporating an antistatic additive into the multilayer optical film; wherein making the multilayer optical film comprises; providing at least a first stream of resin and a second stream of resin; providing a feeder tube plate having a first plurality of conduits, and a second plurality of conduits interleaved with the first plurality of conduits; feeding the first stream into the first plurality of conduits and the second stream into the second plurality of conduits; providing a slot die for each of the first and second plurality of conduits such that the first and second streams are divided into a plurality of interleaved layers to yield a composite stream; passing the composite stream through an extrusion die to form a multilayer web in which each layer is generally parallel to the major surface of adjacent layers; and heating the first and second streams of resin with at least one axial rod heater. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification