POLYESTER FILM FOR REFLECTOR PURPOSES AND COATED POLYESTER FILM FOR REFLECTORS PURPOSES

• Main Authors: KUBO KOUJI, TOGANO SHINYA, OOYA TAROU, KUSUME HIROSHI
• Format: Patent
• Language: English; Korean
• Published: 12.11.2010
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; BLASTING; CHEMISTRY; COMPOSITIONS BASED THEREON; FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMSTHEREOF; GENERAL PROCESSES OF COMPOUNDING; HEATING; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; LIGHTING; MECHANICAL ENGINEERING; METALLURGY; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PHYSICS; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHERARTICLES, NOT OTHERWISE PROVIDED FOR; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WEAPONS; WORKING-UP

A polyester film for reflector purposes which has good drawing properties, with which curl in an environment where it is used as a reflector is suppressed and which has excellent flatness is obtained with a polyester film comprising a supporting layer and a white reflecting layer which is established thereon. The supporting layer comprises from 0.1 to 10 wt% barium sulfate particles and from 99.9 to 90 wt% isophthalic acid copolymerized polyethylene terephthalate and has a thickness of from 10 to 40% of the total film thickness, and the white reflecting layer comprises from 31 to 60 wt% barium sulfate particles and from 69 to 40 wt% isophthalic acid copolymerized polyethylene terephthalate and has a thickness of from 90 to 60% of the total film thickness. The ratio of the amount of isophthalic acid component included in the white reflecting layer and the amount of isophthalic acid component included in the supporting layer (amount of isophthalic acid component included in the white reflecting layer/amount of isophthalic acid component included in the supporting layer) is from 1.5 to 3.0.