Kuraray Specialities Europe Gmbh

Ht Troplast Ag

Uwe Keller

Holger Stenzel

Bernard Koll

The present invention relates to a plasticized foil based on a partially acetalized polyvinyl alcohol (PVB resin) and suitable as an intermediate layer in a laminated safety glass, and comprising:

PVB film containing a plastifying agent

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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Siegburg, Germany

Uwe Keller