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EP0362861A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Liquid crystal device

Assignee: Kanegafuchi Chemical Industry Co Ltd
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Filing: 1989-10-05
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Granted: —
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Expires: 2009-10-05
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Abstract

Abstract A liquid crystal device containing an orientation film is disclosed, the orientation film being obtained by building up at least one mixed monomolecular film on a substrate having thereon an electrode layer, said mixed monomolecular film being obtained by spreading a mixture of (a) an amphiphilic high-molecular weight substance having a number average molecular weight of from 2,000 to 300,000 and containing a repeating unit represented by formula (I): wherein at least one of R¹ and R² represents a group characterized by benzenoid unsaturation having at least 6 carbon atoms; and R³, R⁴, R⁵, and R⁶, which may be the same or different, each represents a hydrogen atom, a substituted or unsubstituted monovalent aliphatic group having from 1 to 30 carbon atoms, a substituted or unsubstituted monovalent composed of an alicyclic group and an aliphatic group having up to 30 carbon atoms in total, or a substituted or unsubstituted monovalent group composed of an aromatic group and an aliphatic group having up to 30 carbon atoms in total, the substituent being selected from a halogen atom, a nitro group, an amino group, a cyano group, a methoxy group, and an acetoxy group; at least one of R³, R⁴, R⁵, and R⁶ is a group other than those having from 1 to 11 carbon atoms or a hydrogen atom, (b) an amphiphilic high-molecular weight substance having a number average molecular weight of from 2,000 to 300,000 and containing a repeating unit represented by formula (II): wherein R¹, R², R³, and R⁴ are as defined above, at least one of R³ and R⁴ being a group other than those having from 1 to 11 carbon atoms or a hydrogen atom, and (c) at least one low-­molecular weight substance, the (a)/(b)/(c) mixing ratio being arbitrary, on a water surface, and subjecting the film to a heat treatment to cause cyclization. The liquid crystal device exhibits uniform and defect-free orientation of the liquid crystal. The liquid crystal orientation film can be obtained at low cost with high mass-productivity.

Inventors

  • 👤 Makoto Ochiai Daini Jutaku 503-808 Murata
  • 👤 Masakazu Uekita

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-02 23:42
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1337; G02F1/133711; G02F1/133723

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 303 words
A liquid crystal device containing an orientation film which is formed by building up at least one mixed monomolecular film on a substrate having thereon an electrode layer, said mixed monomolecular film being obtained by spreading a mixture of (a) an amphiphilic high-molecular weight substance having a number average molecular weight of from 2,000 to 300,000 and containing a repeating unit represented by formula (I): wherein at least one R¹ and R² represents a group characterized by benzenoid unsaturation having at least 6 carbon atoms; and R³, R⁴, R⁵, and R⁶, which may be the same or different, each represents a hydrogen atom, a substituted or unsubstituted monovalent aliphatic groups having from 1 to 30 carbon atoms, a substituted or unsubstituted monovalent group composed of an alicyclic group and an aliphatic group having up to 30 carbon atoms in total, or a substituted or unsubstituted monovalent group composed of an aromatic group and an aliphatic group having up to 30 carbon atoms in total, the substituent being selected from a halogen atom, a nitro group, an amino group, a cyano group, a methoxy group, and an acetoxy group; at least one of R³, R⁴, R⁵, and R⁶ is a group other than those having from 1 to 11 carbon atoms or a hydrogen atom, (b) an amphiphilic high-molecular weight substance having a number average molecular weight of from 2,000 to 300,000 and containing a repeating unit represented by formula (II): wherein R¹, R², R³, and R⁴ are as defined above, at least one of R³ and R⁴ being a group other than those having from 1 to 11 carbon atoms or a hydrogen atom, and (c) at least one low-molecular weight substance, the (a)/(b)/(c) mixing ratio being arbitrary, on a water surface, and subjecting the film to a heat treatment to cause cyclization.
Claim 2
Dependent Claim 303 words
A liquid crystal device containing an orientation film which is formed by building up at least one mixed monomolecular film on a substrate having thereon an electrode layer, said mixed monomolecular film being obtained by spreading a mixture of (a) an amphiphilic high-molecular weight substance having a number average molecular weight of from 2,000 to 300,000 and containing a repeating unit represented by formula (I): wherein at least one R¹ and R² represents a group characterized by benzenoid unsaturation having at least 6 carbon atoms; and R³, R⁴, R⁵, and R⁶, which may be the same or different, each represents a hydrogen atom, a substituted or unsubstituted monovalent aliphatic groups having from 1 to 30 carbon atoms, a substituted or unsubstituted monovalent group composed of an alicyclic group and an aliphatic group having up to 30 carbon atoms in total, or a substituted or unsubstituted monovalent group composed of an aromatic group and an aliphatic group having up to 30 carbon atoms in total, the substituent being selected from a halogen atom, a nitro group, an amino group, a cyano group, a methoxy group, and an acetoxy group; at least one of R³, R⁴, R⁵, and R⁶ is a group other than those having from 1 to 11 carbon atoms or a hydrogen atom, (b) an amphiphilic high-molecular weight substance having a number average molecular weight of from 2,000 to 300,000 and containing a repeating unit represented by formula (II): wherein R¹, R², R³, and R⁴ are as defined above, at least one of R³ and R⁴ being a group other than those having from 1 to 11 carbon atoms or a hydrogen atom, and (c) at least one low-molecular weight substance, the (a)/(b)/(c) mixing ratio being arbitrary, on a water surface, and subjecting the film to a heat treatment to cause cyclization.
Claim 3
Dependent Claim 41 words
A liquid crystal device as claimed in Claim 1, wherein said low-molecular weight substance is selected from the group consisting of an alcohol having from 10 to 30 carbon atoms and a carboxylic acid having from 10 to 30 carbon atoms.
Claim 4
Dependent Claim 25 words
A liquid crystal device as claimed in claim 1, wherein a mixing ratio by weight of the high-molecular weight compounds (a)/(b) in 9/1 to 1/1.
Claim 5
Dependent Claim 42 words
A liquid crystal device as claimed in claim 1, wherein the low molecular weight compound (c) is used in an amount of 1/20 to 1/2 times by weight with respect to a total amount of the high-molecular weight compounds (a) and (b).

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