MULTILAYER INTERMEDIATE FILM

WIPO Patent Application WO/2014/188543

A1

Provided is a laminate which exhibits excellent sound-insulating properties, mechanical strength and adhesion with glass when used as an intermediate film for laminated glass, and which is unlikely to produce interlayer detachment even when used long-term in an environment having a large diurnal temperature difference between hot and cold and a low air temperature which is quite low. The laminate comprises: an A-layer containing 30-50 parts by mass of a plasticizer in relation to 100 parts by mass of a polyvinyl acetal (A) having an average residual hydroxyl group amount in the range of 27-40 mol%; and a B-layer containing 50-70 parts by mass of a plasticizer in relation to 100 parts by mass of a polyvinyl acetal (B) having an average residual hydroxyl group amount in the range of 15-24 mol%. In addition, when analyzing the polyvinyl acetal (A) in an ODS column having a length of 1cm and an inner diameter of 4mm, the polyvinyl acetal (A) is detected in a dissolution time of a1 to a2 minutes, and when analyzing the polyvinyl acetal (B) in an ODS column having a length of 1cm and an inner diameter of 4mm, the polyvinyl acetal (B) is detected in a dissolution time of b1 to b2 minutes. Furthermore, (a2-b1)≥1.

ASANUMA YOSHIAKI (JP)
NAKANO YOKO (JP)

PCT/JP2013/064260

November 27, 2014

May 22, 2013

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KURARAY CO (JP)

B32B27/30; B32B27/22; C03C27/12; C08L29/14

WO2011078314A1

2011-06-30

JP2013006726A	2013-01-10
JP2013006727A	2013-01-10

TAMURA RYOSUKE (JP)
Ryosuke Tamura (JP)

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