Claims
- 1. A twistable liquid crystal phase containing at least two chiral compounds, which comprises at least one first chiral compound being a diester of two mesogenic carboxylic acids and either a chiral compound butane-2,3-diol or a chiral compound propane-2,3-diol exhibiting helix inversion within a temperature range of -40.degree. C. to 200.degree. C., and at least one second chiral compound having a high twisting capacity of a product p.c of less than 8 .mu.m. % by weight and having an increase in pitch per K of 1% to 1% o.
- 2. A liquid crystal phase as claimed in claim 1, in which the second chiral compound having a high twisting capacity possesses an increase in pitch of less than 3% o.
- 3. A liquid crystal phase as claimed in claim 1, which contains 0.01 to 70% by weight of chiral compounds.
- 4. A liquid crystal phase as claimed in claim 1, wherein the weight ratio of the first chiral compounds exhibiting helix inversion to the second chiral compounds having a high twisting capacity is 50:1 to 1:50.
- 5. A liquid crystal phase as claimed in claim 1, wherein the first chiral compound exhibiting helix inversion contains at least one chiral diester selected from the group consisting of: 2,3-bis-[4-(trans-4-n-pentyl-cyclohexyl)-benzoyloxy]-butane,
- 2. 3-bis-[4-(trans-4-n-heptyl-cyclohexyl)-benzoyloxy]-butane,
- 2,3-bis-[4-(4-n-hexyloxy-benzoyloxy)-benzoyloxy]-butane,
- 2,3-bis-(4,-trans-n-pentyl-cyclohexyl-4-diphenyl-carbonyloxy)-butane,
- 2,3-bis-(4,-trans-n-pentyl-4-trans-dicyclohexyl-carbonyloxy)-butane,
- 2,3-bis-[4-(4-n-hexyloxy-benzoyloxy)-benzoyloxy]-propane,
- 2,3-bis-[4-(trans-4-n-heptyl-cyclohexyl)-benzoyloxy]-propane and
- 2,3-bis-(4,-trans-n-pentyl-4-trans-dicyclohexyl-carbonyloxy)-propane.
Priority Claims (1)
Number |
Date |
Country |
Kind |
3534777 |
Sep 1985 |
DEX |
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Parent Case Info
This application is a continuation of application Ser. No. 911,955, filed Sept. 26, 1986, now abandoned.
US Referenced Citations (7)
Foreign Referenced Citations (7)
Number |
Date |
Country |
136725 |
Apr 1985 |
EPX |
138006 |
Apr 1985 |
EPX |
164814 |
Dec 1985 |
EPX |
211646 |
Feb 1986 |
EPX |
2827471 |
Jan 1980 |
DEX |
57-14822 |
Jan 1952 |
JPX |
61-174294 |
Aug 1986 |
JPX |
Non-Patent Literature Citations (1)
Entry |
Diehl et al., Abstract of Tenth International Liquid Crystal Conference, Univ. of York, U.K. (1984). |
Continuations (1)
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Number |
Date |
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Parent |
911955 |
Sep 1986 |
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