Film
First Claim
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1. An optical retardation film comprising a layer of an anisotropic polymer material with an optical axis substantially parallel to the plane of the layer, said optical retardation film being obtainable by a process comprising the following stepsA) coating a polymerizable mesogenic composition essentially consisting of a) 10 to 50% by weight of one or two polymerizable mesogenic compounds of formula Ia and 5 to 35% by weight of one or two polymerizable mesogenic compounds of formula Ib
- wherein W is H or CH3, n is an integer from 3 to 6, and R is alkyl or alkoxy with 1 to 8 C atoms, b) 15 to 60% by weight of a polymerizable mesogenic compound of formula II
wherein W is H or CH3 n is an integer from 3 to 6, Z1 and Z2 are each independently —
COO—
or —
OCO—
, and X1 and X2 are each independently H or CH3, and c) 0.1 to 8% by weight of a photoinitiator, said mixture optionally being dissolved in an organic solvent in a concentration of up to 50% by weight, on a substrate in form of a layer, B) aligning the polymerizable mesogenic composition into a homogeneous orientation, C) polymerizing the polymerizable mesogenic composition by exposure to UV light, and D) optionally removing the substrate from the polymerized material,
characterized in that I) 50 to 2500 ppm of a mixture of non-ionic fluoroalkyl-alkoxylate surfactants selected from the following formulae
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Abstract
The invention relates to an optical retardation film comprising a layer of an anisotropic polymer material with an optical axis substantially parallel to the plane of the layer. The invention furthermore relates to a process of preparing the optical retardation film, to the use of such an optical retardation film in liquid crystal displays, and to a liquid crystal display device comprising a liquid crystal cell and such an optical retardation film.
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Citations
12 Claims
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1. An optical retardation film comprising a layer of an anisotropic polymer material with an optical axis substantially parallel to the plane of the layer, said optical retardation film being obtainable by a process comprising the following steps
A) coating a polymerizable mesogenic composition essentially consisting of a) 10 to 50% by weight of one or two polymerizable mesogenic compounds of formula Ia and 5 to 35% by weight of one or two polymerizable mesogenic compounds of formula Ib - wherein
W is H or CH3, n is an integer from 3 to 6, and R is alkyl or alkoxy with 1 to 8 C atoms, b) 15 to 60% by weight of a polymerizable mesogenic compound of formula II
whereinW is H or CH3 n is an integer from 3 to 6, Z1 and Z2 are each independently —
COO—
or —
OCO—
, andX1 and X2 are each independently H or CH3, and c) 0.1 to 8% by weight of a photoinitiator, said mixture optionally being dissolved in an organic solvent in a concentration of up to 50% by weight, on a substrate in form of a layer, B) aligning the polymerizable mesogenic composition into a homogeneous orientation, C) polymerizing the polymerizable mesogenic composition by exposure to UV light, and D) optionally removing the substrate from the polymerized material,
characterized in thatI) 50 to 2500 ppm of a mixture of non-ionic fluoroalkyl-alkoxylate surfactants selected from the following formulae - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- wherein
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11. A film comprising a layer of an anisotropic polymer material with an optical axis substantially parallel to the plane of the layer, said film being obtainable by a process comprising the following steps
A) coating a polymerizable mesogenic composition comprising: -
a) 10 to 50% by weight of one or two polymerizable mesogenic compounds of formula Ia and 5 to 35% by weight of one or two polymerizable mesogenic compounds of formula Ib
whereinW is H or CH3, n is an integer from 3 to 6, and R is alkyl or alkoxy with 1 to 8 C atoms, b) 15 to 60% by weight of a polymerizable mesogenic compound of formula II
whereinW is H or CH3 n is an integer from 3 to 6, Z1 and Z2 are each independently —
COO—
or —
OCO—
, andX1 and X2 are each independently H or CH3, and c) 0.1 to 8% by weight of a photoinitiator, said mixture optionally being dissolved in an organic solvent in a concentration of up to 50% by weight, on a substrate in form of a layer, B) aligning the polymerizable mesogenic composition into a homogeneous orientation, C) polymerizing the polymerizable mesogenic composition by exposure to UV light, and D) optionally removing the substrate from the polymerized material,
whereinI) 50 to 2500 ppm of a mixture of non-ionic fluoroalkyl-alkoxylate surfactants selected from the following formulae
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12. A film being obtainable by a process comprising the following steps
A) coating a polymerizable mesogenic composition comprising: -
a) 10 to 50% by weight of one or two polymerizable mesogenic compounds of formula Ia and 5 to 35% by weight of one or two polymerizable mesogenic compounds of formula Ib
whereinW is H or CH3, n is an integer from 3 to 6, and R is alkyl or alkoxy with 1 to 8 C atoms, b) 15 to 60% by weight of a polymerizable mesogenic compound of formula II
whereinW is H or CH3 n is an integer from 3 to 6, Z1 and Z2 are each independently —
COO—
or —
OCO—
, andX1 and X2 are each independently H or CH3, and c) 0.1 to 8% by weight of a photoinitiator, said mixture optionally being dissolved in an organic solvent in a concentration of up to 50% by weight, on a substrate in form of a layer, B) aligning the polymerizable mesogenic composition into a homogeneous orientation, C) polymerizing the polymerizable mesogenic composition and D) optionally removing the substrate from the polymerized material,
wherein optionallyI) 50 to 2500 ppm of a mixture of non-ionic fluoroalkyl-alkoxylate surfactants selected from the following formulae
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Specification
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Current AssigneeMerck Patent GmbH (Merck & Co., Inc.), Teledyne Scientific & Imaging, LLC (Teledyne Technologies Incorporated)
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Original AssigneeMerck Patent GmbH (Merck & Co., Inc.), Rockwell Technologies, LLC (Teledyne Technologies Incorporated)
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InventorsCoates, David, Chung, Young, Egan, Gabrielle, Sharples, Nicholas, Hanamoto, Jane H., Li, Zili, Zhuang, Zhiming, Winker, Bruce K.
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Primary Examiner(s)Huff, Mark F.
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Assistant Examiner(s)Sadula, Jennifer R.
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Application NumberUS09/652,553Time in Patent Office1,062 DaysField of Search428/1.1, 428/1.2, 428/1.3, 428/1.31, 428/1.33, 428/1.53, 428/1.54, 428/1.55US Class Current252/299.63CPC Class CodesC09K 19/3068 chain containing -COO- or -...C09K 19/3852 Poly(meth)acrylate derivativesC09K 2019/0448 the end chain group being a...G02B 5/3016 involving passive liquid cr...
