Process for the preparation of glass laminates with sound dampening properties by laminating glass panes with at least one thin polyvinyl acetal layer containing a low content of plasticizer and at least one further polyvinyl acetal layer containing plasticizer

摘要

Producing a laminated glass, comprises laminating, between two glass sheets, at least one film A having a glass transition temperature TA and containing a polyvinyl acetal PA and optionally at least one plasticizer WA, and at least one film B having a glass transition temperature TB and containing a polyvinyl acetal PB and at least one plasticizer WB, where, before the lamination process, the film B has a proportion of plasticizer WA from 24.1-36 wt.%, and the film A has a proportion of plasticizer WB from 0-23.9 wt.% and has a thickness of less than 30% of the thickness of film B.