Ultraviolet radiation-curable light-modulating film for a light

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Compositions to be polymerized by wave energy wherein said...

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522148, 522172, 522 71, 522 74, 522 96, 522 93, 522100, 522102, 522152, 522170, 522157, 522168, 359296, C08F 246, C08J 328, C08K 328, G02B 2600

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061144053

ABSTRACT:
A method for preparing a film suitable for use as the light-modulating unit of an SPD light valve, which film comprises a cross-linked polymer matrix having droplets of a liquid light valve suspension distributed in the cross-linked polymer matrix. The light valve suspension comprises particles suspended in a liquid suspending medium. The method comprises admixing a UV cross-linkable liquid oligomer or polymer and the liquid light valve suspension, emulsifying the resulting admixture to form an emulsion of the liquid light valve suspension in the UV cross-linkable liquid oligomer or polymer, and cross-linking the UV cross-linkable liquid oligomer or polymer while the mixture is in the form of a thin layer of the emulsion by exposing the layer to UV radiation or to an electron beam, such that the film is not damaged due to such exposing. The oligomer or polymer and the particles are free of deleterious effects on one another. The index of refraction of the polymer matrix and the liquid light valve suspensions are the same or as near to equal as possible.

REFERENCES:
patent: 5377042 (1994-12-01), Chahroudi
patent: 5404245 (1995-04-01), Chahroudi
patent: 5462492 (1995-10-01), Check, III
patent: 5463491 (1995-10-01), Check, III
patent: 5516455 (1996-05-01), Jacobine et al.

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