摘要:
A novel LCP material based on forked side chain acrylates is disclosed having a general formula I; ##STR1## wherein W=H, CH.sub.3, Cl R.sub.1 and R.sub.2 may or may not be the same but have the following general structure: ##STR2## p=2 to 14; q=0 or 1;r=1 or 2;s=1 or 2;X=O, CO.sub.2, O.sub.2 C, CH.sub.2 ;Y=C.sub.2 H.sub.4, O, CO.sub.2, O.sub.2 C;Z=CN, halogen, R, CO.sub.2 R, OR, O.sub.2 CR, wherein R=chiral or achiral.
摘要翻译:PCT No.PCT / GB93 / 01017 Sec。 371日期1994年12月6日第 102(e)日期1994年12月6日PCT提交1993年5月19日PCT公布。 公开号WO93 / 25633 日本1993年12月23日公开了一种基于叉状侧链丙烯酸酯的新型LCP材料,其具有通式I; 其中W = H,CH 3,Cl R 1和R 2可以相同也可以不相同,但具有以下通用结构:p = 2〜14; q = 0或1; r = 1或2; s = 1或2; X = O,CO 2,O 2 C,CH 2; Y = C2H4,O,CO2,O2C; Z = CN,卤素,R,CO 2 R,OR,O 2 CR,其中R =手性或非手性。
摘要:
Disclosed are liquid crystal compounds of formula IR.sup.1 --P--X--(A.sup.1 --Z.sup.1).sub.n --A.sup.2 --R.sup.2 IwhereinR is ##STR1## W is H, Cl or C.sub.1-5 -alkyl, and m is 1-7,P is C.sub.1-12 alkylene, one or more CH.sub.2 groups optionally being replaced by O,X is --O--, --S--, --COO--, --OCO-- or a single bond,R.sup.2 is C.sub.1-15 -alkyl optionally substituted by halogen, one or more CH.sub.2 groups optionally replaced by --O--, --S--, --CO--, --O--CO--, --CO--O-- or --O--CO--O--; R.sup.1 --P--X, CN, F, Cl or --V--Q--T,V is --O--, --S-- or a single bond,Q is --CH.sub.2 --, --CHF--, --CF.sub.2 --,T is F or Cl,n is 1 or 2,A.sup.1, A.sup.2 are 1,4-phenylene optionally substituted by F, Cl, CN or --W--C.sub.r H.sub.s F.sub.2r+1-s, or one of A.sup.1 or A.sup.2 is ##STR2## pyrimidine-2,5-diyl or pyrimidine-2,5 diyl, Z.sup.1 is --CO--O--, --O--CO--, --CH.sub.2 CH.sub.2 -- or a single bond,r is 1 or 2,s is O, 1, 2, 3, 4, or 5,W is a single bond, --O--, --S-- or --CO--,with the provisos (i) that at least one of A.sup.1 and A.sup.2 is a 1,4-phenylene group which is mono-or polysubstituted by Cl, CN or --W--C.sub.r H.sub.s F.sub.2r+1-s, said substituted 1,4-phenylene group optionally additionally substituted by one or more F-atoms, and (ii) that in case n=2 (a) only one of Z.sup.1 is --COO-- or --OCO-- or (b) at least one of A.sup.1 and A.sup.2 is double substituted or (c) at least two of A.sup.1 and A.sup.2 are substituted.
摘要:
The invention relates to a liquid crystalline material in the form of an anisotropic gel consisting of a polymerized monotropic or enantiotropic liquid crystalline material and a low-molecular weight liquid crystalline material, wherein the polymerized material a) forms a permanently oriented network in the low-molecular liquid crystalline material b), characterized in that the low-molecular weight liquid crystalline material b) exhibits a dielectric anisotropy .DELTA..epsilon.
摘要:
The invention relates to copolymers made from mono-reactive liquid and/or di-reactive liquid crystals which can be photopolymerized to form copolymers and to novel reactive liquid crystal compound having a nematic phase. Preferentially the reactive liquid crystal is polymerized while in the liquid crystal phase to produce an oriented birefringent polymer film. To do this, the reactive liquid crystal, in its nematic or smectic phase is aligned (by well known techniques such as rubbed polyimide, etc.) and the thin film containing a small amount of photoinitiator, is subjected to ultraviolet light whereupon it polymerizes into a thin, aligned polymer film.
摘要:
This invention describes a method for the loading and alignment of elastomers in electro-optic and electro-active devices. It comprises the in-situ polymerization between substrates of liquid crystal monomers in the presence of cross-linking reagents. It also describes the production of free-standing elastomer films.
摘要:
A novel LCP material based on fumarate and maleate di-esters is disclosed having general formula (I); R.sub.1 and R.sub.2 may may not be the same but have general structure (II); (a)=(b), (c), (d); p=2 to 14; q=0 or 1; r=1 or 2; s=1 or 2; X.dbd.O, CO.sub.2, O.sub.2 C, CH.sub.2 ; Y.dbd.C.sub.2 H.sub.4, O, CO.sub.2, O.sub.2 C; Z.dbd.CN, halogen, R, CO.sub.2 R, OR, O.sub.2 CR, wherein R=chiral or achiral.
摘要翻译:PCT No.PCT / GB93 / 01018 Sec。 371日期1994年12月6日第 102(e)日期1994年12月6日PCT提交1993年5月19日PCT公布。 公开号WO93 / 25634 PCT 日本公开了具有通式(I)的基于富马酸和马来酸二酯的新型LCP材料。 R1和R2可能不一样,但具有一般结构(II); (a)=(b),(c),(d); p = 2〜14; q = 0或1; r = 1或2 s = 1或2; X = O,CO 2,O 2 C,CH 2; Y = C2H4,O,CO2,O2C; Z = CN,卤素,R,CO 2 R,OR,O 2 CR,其中R =手性或非手性。
摘要:
Methods for loading and alignment of liquid crystal polymers in electro-optic and electro-active devices comprise in-situ polymerisation between substrates of monomer material in the presence of a cationic initiator. This allows for the synthesis of liquid crystal polymers containing polyether backbones.
摘要:
A novel LCP material based on di-esters of itaconic acid is disclosed having general formula (I), where R.sub.1 and R.sub.2 may or may not be the same and have general structure (II); (a)=(b), (c), (d); p=2 to 14; q=0 or 1; r=1 or 2; s=1 or 2; X =O, CO.sub.2, O.sub.2 C, CH.sub.2 ; Y=C.sub.2 H.sub.4, O, CO.sub.2, O.sub.2 C; Z=CN, halogen, R, CO.sub.2 R, OR, O.sub.2 CR; wherein R=chiral or achiral; excluding X=O and X=CH.sub.2 when A=phenyl, r=s=1, Y=CO.sub.2, O.sub.2 C, q=1 and Z=CN, R, CO.sub.2 R, OR.
摘要翻译:PCT No.PCT / GB93 / 01016 Sec。 371日期1994年12月6日第 102(e)日期1994年12月6日PCT提交1993年5月19日PCT公布。 出版物WO93 / 25632 日本1993年12月23日公开了一种基于衣康酸的二酯的新型LCP材料,其具有通式(I),其中R 1和R 2可以相同也可以不相同并具有通式(II); (a)=(b),(c),(d); p = 2〜14; q = 0或1; r = 1或2; s = 1或2; X = O,CO 2,O 2 C,CH 2; Y = C2H4,O,CO2,O2C; Z = CN,卤素,R,CO 2 R,OR,O 2 CR; 其中R =手性或非手性; 当A =苯基时,X = O和X = CH 2,r = s = 1,Y = CO 2,O 2 C,q = 1,Z = CN,R,CO 2 R,OR。
摘要:
A cholesteric liquid crystal display device (10) comprises a layer of cholesteric liquid crystal material (11) supported by at least one substrate (13; electrode layers (14,15) on opposite sides of the layer of cholesteric liquid crystal material (11); and a light absorptive or reflective layer (17) on the rear side of the layer of cholesteric liquid crystal material (11). To provide non-uniform reflection of light, there is a layer (18) of reflective flakes (19) on the front side of the light absorptive or reflective layer (17), or the reflective layer is shaped to be non-planar.
摘要:
In a cholesteric liquid crystal display device (24), to drive a surface-stabilized layer of cholesteric liquid crystal material into the focal conic state, there is applied drive signal comprising a series of pulses (30, 34, 35, 36, 37, 38, 41). At least one initial pulse has sufficient energy to drive the layer of cholesteric liquid crystal material into the homeotropic state and the subsequent pulses have time-averaged energies which reduce to a minimum level at which the layer of cholesteric liquid crystal material is driven into the focal conic state. This produces a focal conic state of particularly low reflectance, which allows a high contrast ratio to be achieved.