Light valve employing a film comprising an encapsulated liquid suspension, and method of making such film
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1. A film suitable for use as the light-modulating unit of a light valve, comprising a cross-linked polymer matrix having droplets of a liquid light valve suspension distributed in and in direct contact with the cross-linked poller matrix, said liquid light valve suspension comprising organic particles suspended in a liquid suspending medium.
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Abstract
A film suitable for use as the light modulating unit of a light valve comprises a cross-linked polymer matrix having droplets of a liquid light valve suspension distributed in the cross-linked polymer matrix, and a light valve comprising such a film.
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24 Claims
- 1. A film suitable for use as the light-modulating unit of a light valve, comprising a cross-linked polymer matrix having droplets of a liquid light valve suspension distributed in and in direct contact with the cross-linked poller matrix, said liquid light valve suspension comprising organic particles suspended in a liquid suspending medium.
- 10. A film suitable for use as the light-modulating unit of a light valve, comprising a cross-linked polymer matrix in the form of a film having droplets of a liquid light valve suspension distributed in the cross-linked polymer matrix, said liquid light valve suspension comprising particles suspended in a liquid suspending medium, said film, while in its cured, cross-linked form, having been swollen with a liquid applied to the surface thereof to form a liquid-swollen film that is less light-scattering as compared to said film prior to being swollen with said liquid.
- 16. A film suitable for use as the light-modulating unit of a light valve, comprising a cross-linked polyorganosiloxane polymer matrix having droplets of a liquid light valve suspension distributed in the cross-linked polyorganosiloxane polymer matrix, said light valve suspension comprising particles suspended in a liquid suspending medium.
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24. A method of preparing a film suitable for use as the light-modulating unit of a light valve, comprising a cross-linked polyorganosiloxane polymer matrix having droplets of a liquid light valve suspension distributed in the cross-linked polyorganosiloxane polymer matrix, said light valve suspension comprising particles suspended in a liquid suspending medium;
- which comprises admixing a liquid cross-linkable polyorganosiloxane oligomer or polymer, said liquid light valve suspension and a copolymer of an organosiloxane and a copolymerizable organic monomer as emulsifier, emulsifying the resulting admixture to form an emulsion of said liquid light valve suspension in said cross-linkable liquid polyorganosiloxane oligomer or polymer, and cross-liking said cross-linkable liquid polyorganosiloxane oligomer or polymer while said admixture is in the form of a thin layer of said emulsion.
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