Micro-coextruded film modified with piezoelectric layers
First Claim
1. A multilayer film comprising 5 or more total layers and at least 3 piezoelectric layers in which said piezoelectric layers are each separated by one or more intervening substantially transparent polymer layers,wherein said piezoelectric layers comprise a polymer selected from the group consisting of poly(vinylidene fluoride), poly(vinyl fluoride), aromatic polyamide, polysulfone, cyanoethyl cellulose, polyvinylidene chloride, polyparaxylene and copolymers thereof, andwherein the film is a coextruded film.
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Abstract
Disclosed are layered films having a combination of piezoelectric layers that change dimension with applied voltage and non-piezoelectric layers. The layered structures can form a wide range of electrically switchable optical films. These films have applications in displays, polarizers, optical compensators, aesthetic films, and “hot” and “cold” mirrors that selectively reflect only certain wavelengths. Also disclosed are monochromatic and multicolor displays using these films.
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Citations
11 Claims
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1. A multilayer film comprising 5 or more total layers and at least 3 piezoelectric layers in which said piezoelectric layers are each separated by one or more intervening substantially transparent polymer layers,
wherein said piezoelectric layers comprise a polymer selected from the group consisting of poly(vinylidene fluoride), poly(vinyl fluoride), aromatic polyamide, polysulfone, cyanoethyl cellulose, polyvinylidene chloride, polyparaxylene and copolymers thereof, and wherein the film is a coextruded film.
Specification