Ht Troplast Ag

Bernard Koll

Holger Stenzel

Uwe Keller

Known intermediate foils for compound glasses with improved sound insulation consist of several layers or special materials which cannot be further processed in conventional plants. The aim of the present invention is to provide an intermediate foil for compound glasses with improved sound insulation, whereby said foil consists of one layer as far as possible and is based upon PVB. Said intermediate foil allows for an improved sound insulation of the compound glasses in room temperature and has essentially unchanged working properties, whereby said compound glasses are produced from the intermediate foil. To resolve the aim of the invention, an intermediate foil is provided which contains: 50 to 80 wt. % PVB (partially acetalised polyvinyl alcohol), 20 to 50 wt. % of a softener mixture containing 30 to 70 wt. %, calculated as a portion of the softener mixture, of one or more polyalkylene glycoles of the group consisting of polyalkylene glykoles of the general formula HO&#x2014;(R&#x2014;O)n-H with R=alkylene and n&#x3e;5, block copolymers made of ethylene- and propylene glycole of the general formula HO&#x2014;(CH2-CH2-O)n-(CH2-CH(CH3)-O)m-H with n&#x3e;2, m&#x3e;3 and (n+m)&#x3c;25, derivatives of block copolymers made of ethylene- and propylene glycole of the general formula R1O&#x2014;(CH2-CH2-O)n-(CH2-CH(CH3)-O)m-H or HO&#x2014;(CH2-CH2-O)n-(CH2-CH(CH3)-O)m-R1 with n&#x3e;2, m&#x3e;3 and (n+m)&#x3c;25 and R1 as the organic radical, derivatives of polyalkylene glycols of the general formula R1-O&#x2014;(R2-O)n-H with R2=alkylene and n&#x3e;2, wherein the hydrogen of one of the two terminal hydroxygroups of the polyalkylene glycol is replaced by an organic Rest R1, derivatives of polyalkylene glycols of the general formula R1-O&#x2014;(R2-O)n-R3 with R2=alkylene and n&#x3e;5, wherein the hydrogen of the two terminal hydroxygroups of the polyalkylene glycol is replaced by an organic Rest R1 or R3.

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Sankt Augustin, Germany

Bernard Koll