Claims
- 1. An optically responsive film comprising birefringent nematic and/or brirefringent chiral nematic liquid crystal microdroplets dispersed in a film of the ultraviolet radiation cured reaction product of a polyallyl compound and a polythiol taken from the group consisting of Z[OCO(CH.sub.2).sub.n SH].sub.m, where Z=a polyvalent organic moiety which is the CH.sub.0-3 group containing nucleus of a tri- or tetravalent alcohol of the type of glycerol or pentaerythritol, m=3 or 4and n=1 to 5, said microdroplets displaying positive dielectric anisotropy and/or positive diamagnetic anisotropy, said film being capable of undergoing repeated thermally and electrically or magnetically induced transitions between opaque and transparent.
- 2. An optically responsive film comprising birefringent nematic and/or birefringent chiral nematic liquid crystal microdroplets dispersed in a film of the ultraviolet radiation cured reaction product of triallyl isocyanurate and pentaerythritol tetakis(3-mercapto-propionate), said microdroplets displaying positive dielectric anisotropy and/or positive diamagnetic anisotropy, said film being capable of undergoing repeated thermally and electrically or magnetically induced transitions between opaque and transparent.
- 3. A method of making an optically responsive film containing microdroplets of a birefringent nematic and/or birefringent chiral nematic liquid crystal material dispersed in a polymer film comprising
- mixing a liquid crystal material with the UV-curable liquid precursor mixture comprising a polyallyl compound and a polythiol taken from the group consisting of Z[OCO(CH.sub.2).sub.n SH].sub.m, where Z=a polyvalent organic moiety which is the CH.sub.0-3 group containing nucleus of a tri- or tetravalent alcohol of the type of glycerol or pentaerythritol, m=3 or 4and n=1 to 5, and thereafter
- curing the mixture in the form of a film with high intensity ultraviolet radiation to thereby form a cured polymer matrix which is a reaction product of said allyl compound and polythiol containing dispersed therein droplets of liquid crystal material displaying positive dielectric anisotropy and/or positive diamagnetic anisotropy.
- 4. A method of making an optically responsive film containing microdroplets of a birefringent nematic and/or birefringent chiral nematic liquid crystal material dispersed in a polymer film comprising
- mixing a liquid crystal material with the UV-curable liquid precursor mixture comprising triallyl isocyanurate and pentaerythritol tetrakis(3-mercapto-propionate) and thereafter
- curing the mixture in the form of a film with high intensity ultraviolet radiation to thereby form a cured polymer matrix which is a reaction product of said precursors containing dispersed therein droplets of liquid crystal material displaying positive dielectric anistropy and/or positive diamagnetic anisotropy.
Parent Case Info
This is a continuation-in-part of co-pending application Ser. No. 742,983 filed June 10, 1985, now abandoned.
US Referenced Citations (17)
Foreign Referenced Citations (6)
Number |
Date |
Country |
0119867 |
Aug 1984 |
EPX |
1908118 |
Nov 1971 |
DEX |
1698092 |
Feb 1974 |
DEX |
178428 |
Oct 1984 |
JPX |
226322 |
Dec 1984 |
JPX |
WO8504262 |
Sep 1985 |
WOX |
Non-Patent Literature Citations (1)
Entry |
Fergason: "Polymer Encapsulated Nematic Liquid Crystals for Display and Light Control Applications", SID 85 Digest, (1985), pp. 68-70. |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
742983 |
Jun 1985 |
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