The polyvinyl acetal resin is not particularly limited, and as the polyvinyl acetal resin, a resin containing {HEAD ~ a polymer} represented by {TAIL ~ the following general formula} , which is described in a paragraph of JP No 3984277 can be used 
represented by
The polyvinyl acetal resin is not particularly limited , and as the polyvinyl acetal resin , a resin containing { HEAD ~ a polymer } represented by { TAIL ~ the following general formula } , which is described in a paragraph of JP No 3984277 can be used
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH