METHACRYLIC RESIN COMPOSITION FOR OPTICAL MEMBER, MOLDED BODY, AND OPTICAL MEMBER

• Main Authors: IMADA TOSHINORI, AMINAKA MUNEAKI, WATANABE HARUMI
• Format: Patent
• Language: English; Japanese
• Published: 07.03.2019
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; ORGANIC MACROMOLECULAR COMPOUNDS; PHYSICS; THEIR PREPARATION OR CHEMICAL WORKING-UP

To provide a methacrylic resin composition which has heat resistance, has highly controlled birefringence, has high light transmittance in a long light path, and is excellent in color tone and transparency. A methacrylic resin composition contains a methacrylic resin including at least a structural unit derived from an N-substituted maleimide monomer in its main chain, has a melt viscosity on the conditions of a glass transition temperature of higher than 120°C and 160°C or lower, a resin temperature of 270°C and a shear rate of 1000 secof 250 pa seconds or less, and has an absolute value of a photoelastic coefficient of 1×10paor less, where in a solution in which the resin composition is dissolved in chloroform in 20 mass to volume percentage, light transmittance measured on the conditions of a light path length of 100 mm and a wavelength of 470 nm is 94% or more, and light transmittance measured on the condition of a wavelength of 700 nm is 96% or more.SELECTED DRAWING: None 【課題】耐熱性が高く、高度に複屈折が制御され、長光路での高い光線透過率を有し、色調及び透明性に優れたメタクリル系樹脂組成物の提供である。【解決課題】主鎖に少なくともＮ−置換マレイミド単量体由来の構造単位を含むメタクリル系樹脂を含み、ガラス転移温度が１２０℃超１６０℃以下、樹脂温度２７０℃でせん断速度１０００ｓｅｃ-1の条件下の溶融粘度が２５０ｐａ・秒以下、光弾性係数の絶対値が１×１０-12ｐａ-1以下であり、該樹脂組成物を２０質量対容量百分率にてクロロホルムに溶解した溶液について、光路長１００ｍｍ、波長４７０ｎｍの条件下で測定した光線透過率が９４％以上、且つ波長７００ｎｍの条件下で測定した光線透過率が９６％以上であるメタクリル系樹脂組成物。【選択図】なし