INTERLAYER FILM FOR LAMINATED GLASS AND LAMINATED GLASS

• Main Authors: OBATA MASATOSHI, FUKAYA JUICHI, TAKAHASHI HIDEYUKI
• Format: Patent
• Language: English
• Published: 16.09.2003
• Edition: 7
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; GENERAL PROCESSES OF COMPOUNDING; GLASS; JOINING GLASS TO GLASS OR OTHER MATERIALS; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; METALLURGY; MINERAL OR SLAG WOOL; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FORVEHICLES; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS; SURFACE TREATMENT OF GLASS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; VEHICLES IN GENERAL; WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILARDEVICES FOR VEHICLES; WORKING-UP

PROBLEM TO BE SOLVED: To provide an interlayer film for laminated glass which has small change of additive concentration in the lapse of time, shows stable resistance to penetration in the lapse of time when being fabricated into a laminated glass and, moreover, has excellent transparency, and to provide a laminated glass using the interlayer film. SOLUTION: This interlayer film contains 100 pts.wt. polyvinyl acetal resin, 0.05-20 pts.wt. phillosilicate, 20-100 pts.wt. plasticizer and 0.0001-1.0 pts.wt. at least one kind of metal salt selected from a group consisting of alkali metal salt and alkaline earth metal salt, and is dispersed microscopically-uniformly with the phillosilicate. This laminated glass is fabricated by holding the interlayer film between two sheets of glass and, thereafter, the laminated glass is left as it is at 50°C for 1 month. At this time, in this interlayer film, the concentration of alkali metal or alkaline earth metal in the film outer layer part which is the part from the surface to depth of 60 μm in the film thickness direction is ≤200% of the concentration of that in the film central part which is the part from the center part to ±190 μm. COPYRIGHT: (C)2003,JPO