Interlayer for laminated glass and laminated glass

摘要

Provided is an interlayer for laminated glass which increases sound-insulating properties in a high frequency area in a laminate glass over a wide temperature range. An interlayer film for laminated glass of the present invention includes first, second, and third layers, wherein when a cloud point C1 is measured by using a first liquid containing 100 parts by weight of a first plasticizer and 8 parts by weight of a first polyvinyl acetal resin contained in the first layer, a cloud point C2 is measured by using a second liquid containing 100 parts by weight of a second plasticizer and 8 parts by weight of a second polyvinyl acetal resin contained in the second layer, and a cloud point C3 is measured by using a third liquid containing 100 parts by weight of a third plasticizer and 8 parts by weight of a third polyvinyl acetal resin contained in the third layer, the cloud point C1 is 10° C. or lower; the cloud point C2 is higher than the cloud point C1 by at least 5° C.; and the cloud point C3 is higher than the cloud point C1 by at least 50° C. and higher than the cloud point C2.

主权项

1. An interlayer film for laminated glass comprising:
a first layer containing a first polyvinyl acetal resin and a first plasticizer; a second layer containing a second polyvinyl acetal resin and a second plasticizer; and a third layer containing a third polyvinyl acetal resin and a third plasticizer, wherein, when a cloud point C1 is measured by using a first liquid containing 8 parts by weight of the first polyvinyl acetal resin dissolved in 100 parts by weight of the first plasticizer, a cloud point C2 is measured by using a second liquid containing 8 parts by weight of the second polyvinyl acetal resin dissolved in 100 parts by weight of the second plasticizer. and a cloud point C3 is measured by using a third liquid containing 8 parts by weight of the third polyvinyl acetal resin dissolved in 100 parts by weight of the third plasticizer, the cloud point C1 is 10° C. or lower; the cloud point C2 is higher than the cloud point C1 by at least 5° C.; and the cloud point C3 is higher than the cloud point C1 by at least 50° C. and higher than the cloud point C2.