Laminated glass and interlayer film for laminated glasses

Abstract

A laminated glass and an interlayer film for laminated glasses are provided, which have the high performance for mitigating the impact given externally and, particularly in the case of using it as glass for vehicles, and which have the high performance for mitigating the impact when a person's head comes into collision with the glass due to the occurrence of a personal accident. Also provided is a laminated glass, wherein at least an interlayer film for laminated glasses and a glass sheet are laminated and unified, Head Injury Criteria (HIC) values, measured according to regulations of European Enhanced Vehicle-safety Committee; EEVC/WG 17, being 1,000 or lower.

1 . A laminated glass,
 wherein at least an interlayer film for laminated glasses and a glass sheet are laminated and unified, Head Injury Criteria (HIC) values, measured according to European Enhanced Vehicle-safety Committee; EEVC/WG 17, being 1000 or lower,   wherein the interlayer film for laminated glasses contains a plasticizer for interlayer films in an amount of 30 parts by weight or more per 100 parts by weight of polyvinyl acetal resin,   wherein the interlayer film for laminated glasses has tan δ of at least one point of 0.6 or more at 20° C. in a range of frequencies of 5.0×10 1  to 1.0×10 2  Hz, and   wherein the polyvinyl acetal resin has a half band width of a peak of a hydroxyl group of 250 cm −1  or lower in measuring absorption spectra.   
   
   
       2 . An interlayer film for laminated glasses, which contains a plasticizer for interlayer films in an amount of 30 parts by weight or more per 100 parts by weight of polyvinyl acetal resin,
 wherein the tan δ of at least one point is 0.6 or more at 20° C. in a range of frequencies of 5.0×10 1  to 1.0×10 2  Hz, and   wherein the polyvinyl acetal resin has a half band width of a peak of a hydroxyl group of 250 cm −1  or lower in measuring absorption spectra.