POLARIZING PLATE FOR LIQUID CRYSTAL DISPLAY DEVICE

• Main Authors: MORIMURA YASUHIRO, YOSHIDA TAKASHIGE, SASAKI KIYOMI, KOTSUBO HIDESHI
• Format: Patent
• Language: English
• Published: 27.08.1996
• Edition: 6
• Subjects: ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; ADHESIVES; CHEMISTRY; 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; DYES; FREQUENCY-CHANGING; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; NON-LINEAR OPTICS; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICAL LOGIC ELEMENTS; OPTICS; PAINTS; PERFORMING OPERATIONS; PHYSICS; POLISHES; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; TRANSPORTING; USE OF MATERIALS AS ADHESIVES

PURPOSE: To enhance adhesive properties and a durability, such as a resistance to heat and a resistance to moist heat, by bonding a polarizing film to protective films with a thermosetting adhesive composed mainly of an ethylene-vinyl acetate copolymer. CONSTITUTION: A polarizing plate 4 is formed by adhesively covering a polarizing film 1 with protective films 2 to be laminated on a liquid crystal cell surface substrate of a liquid crystal display device. As an adhesive 3 for bonding the polarizing film 1 to the protective films 2, a thermosetting adhesive composed mainly of an ethylene-vinyl acetate copolymer is used. The thermosetting adhesive prepared by mixing 0.1-10 pts.wt. organic peroxide and 0.01-5 pts.wt. silane coupling agent per 100 pts.wt. of ethylene-vinyl acetate copolymer and kneading the mixture is formed into a predetermined shape for use by a film forming method, such as calendering, rolling, T-die extrusion, or inflation. A laminate is formed by overlapping the protective films 2 on the polarizing film 1 through adhesive films of the adhesive 3. The polarizing plate 4 is obtained by heating and pressurizing the laminate.