OPTICAL FILM, BACK LIGHT UNIT AND LIQUID CRYSTAL DISPLAY HAVING THE SAME

• Main Authors: JEON, EUN JIN, KIL, MIN HO, SEO, HYO JUNG, LEE, YOUNG SOO
• Format: Patent
• Language: English; Korean
• Published: 10.06.2013
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; FREQUENCY-CHANGING; GENERAL PROCESSES OF COMPOUNDING; METALLURGY; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; ORGANIC MACROMOLECULAR COMPOUNDS; PHYSICS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; THEIR PREPARATION OR CHEMICAL WORKING-UP; WORKING-UP

PURPOSE: An optical film is provided to have high transmittance, low yellowness and haze without using a heat stabilizer and other additives. CONSTITUTION: An optical film consists of an acrylic copolymer. The acrylic copolymer is obtained by polymerizing 70-99 wt% of methylmethacrylate with a dimethylfuran content of 40 ppm or less, and 30-1 wt% of one or more monomers selected from methacrylate or acrylate. The acrylic monomer is manufactured by including a polymerization initiator and a chain transferring agent. The polymerization initiator is peroxide-based compound or azo-based compound. The chain transferring agent is a mercaptane-based compound.