POLYMERIZABLE LIQUID CRYSTALLINE COMPOSITION AND LIQUID CRYSTAL FILM MADE FROM THE COMPOSITION

• US 20070164255A1
• Filed: 03/20/2007
• Published: 07/19/2007
• Est. Priority Date: 10/04/2004
• Status: Active Grant

• Current Assignee: Nippon Oil Corporation (ENEOS Holdings, Inc.)
• Original Assignee: Nippon Oil Corporation (ENEOS Holdings, Inc.)
• Inventors: SEKI, Takashi, MAZAKI, Hitoshi, NAKAMURA, Tooru
• Granted Patent: US 7,416,765 B2
• Time in Patent Office: Days
• US Class Current: 252/299.10
• CPC Class Codes: C08F 220/303 and one or more carboxylic moieties in the chain
• CPC Class Codes: C08F 220/365 containing further carboxylic moieties
• CPC Class Codes: C08K 5/375 containing six-membered aromatic rings C08K5/3725 takes precedence
• CPC Class Codes: C08L 2666/02 Organic macromolecular compounds, natural resins, waxes or and bituminous materials
• CPC Class Codes: C08L 33/14 of esters containing halogen, nitrogen, sulfur, or oxygen atoms in addition to the carboxy oxygen
• CPC Class Codes: C09K 19/2007 the chain containing -COO- or -OCO- groups
• CPC Class Codes: C09K 19/322 Compounds containing a naphthalene ring or a completely or partially hydrogenated naphthalene ring
• CPC Class Codes: C09K 19/3857 containing at least one asymmetric carbon atom
• CPC Class Codes: C09K 19/3861 containing condensed ring systems
• CPC Class Codes: C09K 2019/0448 the end chain group being a polymerizable end group, e.g. -Sp-P or acrylate
• CPC Class Codes: C09K 2019/3408 Five-membered ring with oxygen(s) in fused, bridged or spiro ring systems
• CPC Class Codes: C09K 2019/3416 the heterocyclic ring being a four-membered ring, e.g. oxetane
• CPC Class Codes: C09K 2323/00 Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
• CPC Class Codes: C09K 2323/03 Viewing layer characterised by chemical composition
• CPC Class Codes: C09K 2323/035 Ester polymer, e.g. polycarbonate, polyacrylate or polyester
• CPC Class Codes: G02B 5/3016 involving passive liquid crystal elements optical properties of liquid crystals G02F1/0063; polarising elements associated with active liquid crystal devices G02F1/133528

Abstract

A polymerizable liquid crystalline composition comprises a side chain liquid crystalline polymer obtained by radical-copolymerizing a (meth)acrylic compound has an optically active site and a (meth)acrylic compound having an oxetanyl group, and a cation generator and thus have no functional group the synthesis of which is difficult, such as an epoxy group. The use of the polymerizable liquid crystalline composition provides a cholesteric liquid crystal film which is excellent in a capability of retaining the orientation after being aligned and fixed in a liquid crystal orientation and in mechanical strength without the necessity of a complicated operation such as photo irradiation under an inert gas atmosphere.

Claims

1. A polymerizable liquid crystalline composition comprising:

(I) a side chain liquid crystalline polymer produced by radical-copolymerizing (A) a (meth)acrylic compound having an optically active portion, represented by formula (1) below and (B) a (meth)acrylic compound having an oxetanyl group represented by formula (2) below; and

(II) a photo cation generator and/or a thermal cation generator, the weight ratio of Compound (A) to Compound (B) in the side chain liquid crystalline polymer (I) being within the range of 1;

99 to 99;

1;

3. The polymerizable liquid crystalline composition according to claim 1, wherein C¹ in formula (1) is a group represented by any one of formula (25), (26), (27), (28), or (29):

5. A liquid crystal film, comprising a layer of the polymerizable liquid crystalline composition according to claim 1, formed on an alignment film so as to align cholesterically and fix the molecules, the layer being polymerized with light and/or heat.

7. A liquid crystal film, comprising a layer of the polymerizable liquid crystalline composition according to claim 3, formed on an alignment film so as to align cholesterically and fix the molecules, the layer being polymerized with light and/or heat.

2. A polymerizable liquid crystalline composition comprising:

(III) a side chain liquid crystalline polymer produced by radical-copolymerizing (D) a (meth)acrylic compound having an optically active site, represented by formula (15) below and (E) a (meth)acrylic compound having an oxetanyl group, represented by formula (16) below; and

(IV) a photo cation generator and/or a thermal cation generator, the weight ratio of Compound (D) to Compound (E) in the side chain liquid crystalline polymer (III) being within the range of 1;

99 to 99;

1,

4. The polymerizable liquid crystalline composition according to claim 2, wherein C² in formula (15) is a group represented by any one of formula (30), (31), (32), (33), or (34) below:

6. A liquid crystal film, comprising a layer of the polymerizable liquid crystalline composition according to claim 2, formed on an alignment film so as to align cholesterically and fix the molecules, the layer being polymerized with light and/or heat.

8. A liquid crystal film, comprising a layer of the polymerizable liquid crystalline composition according to claim 4, formed on an alignment film so as to align cholesterically and fix the molecules, the layer being polymerized with light and/or heat.