Patent ID: 6887577

Claim:
A laminated safety glass, comprising; a first and a second pane of glass; and arranged between the first and the second pane of glass, an intermediate layer comprising: from 50 to 80% by weight of partially acetalized polyvinyl alcohol, and from 20 to 50% by weight of a plasticizer mixture comprising a first plasticizer and one or more polyalkylene glycols, wherein from 30 to 70% by weight of said plasticizer mixture is said one or more polyalkylene glycols, and said one or more polyalkylene glycols are selected from: polyalkylene glycols of the general formula HOâ€”(Râ€”O) n â€”H, wherein R is alkylene and n>5; block copolymers of ethylene glycol and propylene glycol of the formula HOâ€”(CH 2 â€”CH 2 â€”O) n â€”(CH 2 â€”CH(CH 3 )â€”O) m â€”H, wherein n>2, m>3, and (n+m)<25; derivatives of block copolymers of ethylene glycol and propylene glycol of the formula R 1 Oâ€”(CH 2 â€”CH 2 â€”O) n â€”(CH 2 â€”CH(CH 3 )â€”O) m â€”H or HOâ€”(CH 2 â€”CH 2 â€”O) n â€”(CH 2 â€”CH(CH 3 )â€”O) m â€”R 1 , wherein n>2, m>3, and (n+m)<25 and R 1 is an organic radical; derivatives of polyalkylene glycols of the formula R 1 â€”Oâ€”(R 2 â€”O) n â€”H, wherein R 2 is alkylene and nâ‰§2, and R 1 is an organic radical; and derivatives of polyalkylene glycols of the formula R 1 â€”Oâ€”(R 2 â€”O) n â€”R 3 , where R 2 is alkylene and n>5, ands R 1 and R 3 are each an organic radical.