PHOTOCURABLE RESIN COMPOSITION, CURED FILM AND LAMINATE OPTICAL FILM

• Main Authors: KAKEYA FUMIAKI, KOMURO KOJI
• Format: Patent
• Language: English; Japanese
• Published: 31.01.2019
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; GENERAL PROCESSES OF COMPOUNDING; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PHYSICS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING-UP

To provide a laminate optical film having a Rth, which is a retardation in a thickness direction, adjusted to a suitable range, and showing little change in the retardation by wavelengths or a small retardation at a low wavelength, and a photocurable resin composition and a cured film useful for the production of the laminate optical film.SOLUTION: The photocurable resin composition comprises a photocurable urethane compound (A) having a structure of formula (I) and a compound (B) having a photocurable unsaturated bond and an aromatic ring in one molecule and has such property that when the composition is formed into a cured film having a thickness of 30 μm, the film shows a Rth of +30 nm or more at a wavelength of 550 nm. In formula (I), Rrepresents an aryl group bonded to N and having 6 or more carbon atoms; Rrepresents a group having at least one carbon-carbon double bond; X represents O, NH or NR, where Rrepresents a linear/branched/cyclic alkyl group having 1 to 6 carbon atoms or an aryl group having 10 or less carbon atoms; and n is an integer of 2 or more.SELECTED DRAWING: None 【課題】厚み方向のリターデーションであるＲｔｈを適切な範囲に調整され、波長によるリターデーションの変化が小さい、または低波長におけるリターデーションが小さい積層光学フィルム、及び、そのような積層光学フィルムの製造に有用な光硬化性樹脂組成物と硬化フィルム等の提供。【解決手段】式（Ｉ）の構造を有する光硬化可能なウレタン化合物（Ａ）と、１分子中に光硬化性の不飽和結合と芳香環とを有する化合物（Ｂ）を含有する光硬化性樹脂組成物であって、厚み３０μｍの硬化フィルムとしたときの波長５５０ｎｍにおけるＲｔｈが＋３０ｎｍ以上である光硬化性樹脂組成物。（Ｒ１はＮと結合した炭素数６以上のアリール基；Ｒ２は１以上の炭素間二重結合を有する基；Ｘは、Ｏ，ＮＨ又はＮＲ３；Ｒ３はＣ１〜６の直鎖状／分岐状／環状のアルキル基又はＣ１０以下のアリール基；ｎは２以上の整数）【選択図】なし