摘要:
A process for purifying an anti-ferroelectric liquid crystal or a ferrielectric liquid crystal, which comprises the following steps 1 to 4,step 1: preparing a liquid crystal solution of an anti-ferroelectric liquid crystal or a ferrielectric liquid crystal to be purified in an aromatic hydrocarbon solvent,step 2; bringing the liquid crystal solution into contact with at least one adsorbent selected from the group consisting of zeolite, alumina and silica gel to separate the liquid crystal solution from the adsorbent,step 3; precision-filtering the resultant liquid crystal solution, andstep 4; removing the solvent from an obtained filtrate and recovering a purified liquid crystal,according to which process, there can be easily obtained a high-purity liquid crystal which shows a specific resistance value of at least 5.times.10.sup.12 .OMEGA..multidot.cm and a small thermal decomposition ratio, and which is therefore suitable as a raw material for a liquid crystal display device.
摘要:
A liquid crystal compound represented by formula (I), ##STR1## wherein A represents --C.sub.3 H.sub.7, --C.sub.4 H.sub.9 or --C.sub.8 H.sub.17 ; when A is --C.sub.3 H.sub.7, m is an integer of 8, 10, 12 or 14; and when A is --C.sub.4 H.sub.9 or --C.sub.8 H.sub.17, m is an integer of 7 to 14,said compound having an antiferroelectric phase.
摘要翻译:由式(I)表示的液晶化合物,其中A表示-C 3 H 7,-C 4 H 9或-C 8 H 17; 当A为-C 3 H 7时,m为8,10,12或14的整数; 当A为-C4H9或-C8H17时,m为7-14的整数,所述化合物具有反铁电相。
摘要:
There are provided a photocurable composition capable of being readily cured by irradiation of ultraviolet rays and a cured product of the photocurable composition, as well as a coating composition and a coating film obtained from the coating composition. The cured product exhibits a high refractive index, a less discoloration and an excellent transparency. The present invention relates to a photocurable composition comprising (A) an episulfide compound containing a thiirane ring; and (B) a photo-base generator represented by the general formula (1): wherein Ar is phenyl, etc.; R is an alkyl group, etc.; —A+ is an ammonium ion; and X− is a borate anion, etc., and a coating composition comprising the photocurable composition and (C) a modified silicone oil, as well as a cured product and a coating film obtained from these compositions.
摘要:
A vicinal dithiol is produced by the reaction of an episulfide compound having at least one thiirane ring in its molecule and a thiocarboxylic S-acid.
摘要:
An optically active compound of the general formula (1), wherein n is an integer of 4 to 8, X is -Ph-COO-Ph-Ph-, -Ph-Ph-COO-Ph-, -Ph-OC-Ph-Ph-, -Ph-Ph-OC-Ph-, -Ph-Ph-Ph-, -Cy-COO-Ph-Ph-, -Ph-Ph-OC-Cy-, -Ph-OC-Ph-COO-Ph-, -Ph-OC-Cy-COO-Ph-, -Ph-OC-Np-COO-Ph-, -Np-OC-Ph- or -Ph-COO-Np- in which -Ph- is a 1,4-phenylene group, -Cy- is a trans-1,4-cyclohexylene group and -Np- is a 2,6-naphthylene group, and C* is an asymmetric carbon, and a nematic liquid crystal composition containing the above optically active compound. According to the present invention, there is provided a nematic liquid crystal composition containing the optically active compound having a helical twisting power (HTP) of 10 or more and giving a chiral dopant for a nematic liquid crystal, which chiral dopant has a property that the pitch of its induced helix decreases in length with an increase in temperature.
摘要:
Optically active compounds of the following general formula (1) useful as chiral dopant, wherein n is an integer of 0 to 5, provided that when n is 0, A is a single bond (—) and that when n is 1 to 5, A is a single bond (—), —O—, —COO—, —Cy— or —Cy—COO— in which —Cy— is a trans-1,4-cyclohexylene group, each of X and Y is independently a hydrogen atom or a fluorine atom, B is a single bond (—), —COO—, —COO—Ph— or —Ph—COO— in which —Ph— is a 1,4-phenylene group, and C* is an asymmetric carbon. The chiral dopant of the present invention have a high helical twisting power of at least 9 and suitably have a feature that the helical pitch induced by them decreases in length with an increase in temperature so that they are advantageous for use in a nematic liquid crystal composition.
摘要翻译:可用作手性掺杂剂的以下通式(1)的光学活性化合物,其中n为0至5的整数,条件是当n为0时,A为单键( - ),当n为1至5时, A是单键( - ),-O - , - COO - , - C y - 或-C y -COO-,其中-Cy-是反式-1,4-亚环己基,X和Y各自独立地为 氢原子或氟原子,B是单键( - ),-COO-,-COO-Ph-或-Ph-COO-,其中-Ph-是1,4-亚苯基,C *是 不对称碳。 本发明的手性掺杂剂具有至少9的高的螺旋扭转力,并且适当地具有由它们引起的螺旋桨距随温度升高而减小的特征,因此它们有利于用于向列型液晶组合物 。
摘要:
There is provided a coating composition having a good wetting property which is capable of forming a coating film exhibiting a high refractive index, a less discoloration, and excellent transparency and uniformity when polymerized and cured. The present invention relates to a coating composition comprising (A) 100 parts by weight of a thiirane ring-containing compound, (B) 0.0001 to 10 parts by weight of a catalyst for accelerating polymerization of the thiirane ring-containing compound, and (C) 0.005 to 4 parts by weight of a modified silicone oil; a coating film produced from the composition; and an optical product provided with the coating film.
摘要:
A mold for shaping a skin sheet has a three-dimensional body including a top surface and side surfaces that work as a shaping surface, respectively. The top surface and the side surfaces have a plurality of small holes communicating with a suction unit for drawing the skin sheet thereon by suction force generated by the suction unit. Each of the side surfaces has a product portion and a non-product portion parted at a trimming line, the portions corresponding to those of the skin sheet that are used as a product and not used as the product, respectively. The body has a plurality of guidance plates, each projecting outside at an edge line of the body. An upper edge of each of the guidance plates forms a ridge line in a shape of a wave. The ridge line descends from a position in the vicinity of an intersection point of the edge line and the trimming line to a direction of the bottom of the body so as to form a valley and thereafter ascends to an opposite direction so as to form a mountain. The height of the deepest point of the valley is lower than that of the trimming line.
摘要:
A vicinal dithiol is produced by the reaction of an episulfide compound having at least one thiirane ring in its molecule and a thiocarboxylic S-acid.
摘要:
An optically active compound of the following general formula (1), wherein A is —C≡C— or —COO—, each of R1 and R2 is independently CnH2n+1—, (C2H5)2CHCH2C*H(CH3)OOC—, CmH2m+1C*H(CH3)OOC— or C6H5C*H(CH3)OOC— in which n is an integer of 2 to 5, m is an integer of 5 to 9, C6H5— is phenyl group, and C* is an asymmetric carbon, provided that there is no case where R1 and R2 are together CnH2n+1— or C6H5C*H(CH3)OOC— and that when both R1 and R2 are CmH2m+1C*H(CH3)OOC—, m in CmH2m+1C*H(CH3)OOC— represented by R1 and m in CmH2m+1C*H(CH3)OOC— represented by R2 may be different integers. The optically active compound of the present invention is excellently valuable as a chiral dopant since it has properties that its helical twisting power (HTP) is at least 9, that a helical pitch induced decreases with an increase in temperature and further that its birefringence (&Dgr;n) is large.
摘要翻译:下列通式(1)的光学活性化合物,其中A为-C = C-或-COO-,R1和R2各自独立地为C n H 2n + 1,(C 2 H 5)2 CHCH 2 C * H(CH 3)OOC-, CmH2m + 1C * H(CH3)OOC-或C6H5C * H(CH3)OOC-,其中n为2〜5的整数,m为5〜9的整数,C6H5-为苯基,C *为 只要不存在R 1和R 2一起为C n H 2n + 1或C 6 H 5 C * H(CH 3)OOC-的情况,并且当R 1和R 2均为C m H 2m + 1C * H(CH 3)OOC-时,m C m H 2 m 由R1表示的+ 1C * H(CH3)OOC-,R2表示的CmH2m + 1C * H(CH3)OOC-中的m可以是不同的整数。本发明的光学活性化合物作为手性掺杂剂是非常有价值的,因为它 具有其螺旋扭转功率(HTP)至少为9的性质,螺旋桨距诱导随着温度的升高而降低,并且进一步其双折射(Deltan)大。