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AssigneeDIC Corporation
InventorsToru Fujisawa, Masayuki Iwakubo, Hiroshi Hasebe, Fumiaki Kodera, Keumhee Jang
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“Object” To provide a tilt-imparted liquid crystal display element that is obtained through UV irradiation of a polymerizable liquid crystal composition, whose drive voltage can be reduced with a fast decay time maintained, and that is well balanced between characteristics, such as decay time, drive voltage, and transmittance. A polymerizable liquid crystal composition for use in it is also provided. “Solution” A liquid crystal display element has polymer networks formed in the liquid crystal phase 5 in FIG. 3. The polymer networks are formed by polymerizing a polymerizable liquid crystal composition that contains, as essential ingredients, a radically polymerizable monomer component (A), a liquid crystal material (B), and a polymerization initiator (C) that has a molecular structure resulting from substituting any two or more hydrogen atoms in the aromatic nucleus in the molecular structure of an alkylphenone-based photopolymerization initiator, for example with a C1-10 alkyl group (i).
A polymerizable liquid crystal composition comprising, as essential ingredients, a radically polymerizable monomer component (A), a liquid crystal material (B), and a polymerization initiator (C) having a molecular structure resulting from substituting any two or more hydrogen atoms in an aromatic nucleus in a molecular structure of an alkylphenone-based photopolymerization initiator with an alkyl group (i) having number of carbon atoms from 1 to 10 (hereinafter simply referred to as “C1-10”), an organic group (ii) having a chemical structure resulting from substituting one —CH2— present in a C2-10 alkyl chain, or each of nonadjacent two or more independently, with —O—, —CO—, —COO—, —OCO—, or —O—CO—O—, or a halogen-containing hydrocarbon group (iii) resulting from substituting one hydrogen atom present in the alkyl group or organic group, or each of two or more independently, with a fluorine or chlorine atom.
The polymerizable liquid crystal composition, wherein the composition contains, as an essential ingredient, a polymerization initiator (C) represented by general formula (I) below
Dependencies are inferred from the claim text.