Compound safety glass and PVB foil for the production thereof

Details Compound safety glass and PVB foil for the production thereof Compound safety glass and PVB foil for the production thereof

2005-05-03

2005-05-03

Nakarani, D. S. (Department: 1773)

Stock material or miscellaneous articles

Composite

Of quartz or glass

C428S437000, C524S297000, C524S306000, C524S308000, C524S314000, C524S377000, C524S378000, C524S385000, C524S386000

Reexamination Certificate

active

06887577

ABSTRACT:
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—(R—O)n-H with R=alkylene and n>5, block copolymers made of ethylene- and propylene glycole of the general formula HO—(CH2-CH2-O)n-(CH2-CH(CH3)-O)m-H with n>2, m>3 and (n+m)<25, derivatives of block copolymers made of ethylene- and propylene glycole of the general formula R1O—(CH2-CH2-O)n-(CH2-CH(CH3)-O)m-H or HO—(CH2-CH2-O)n-(CH2-CH(CH3)-O)m-R1 with n>2, m>3 and (n+m)<25 and R1 as the organic radical, derivatives of polyalkylene glycols of the general formula R1-O—(R2-O)n-H with R2=alkylene and n>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—(R2-O)n-R3 with R2=alkylene and n>5, wherein the hydrogen of the two terminal hydroxygroups of the polyalkylene glycol is replaced by an organic Rest R1 or R3.

REFERENCES:
patent: 5332774 (1994-07-01), Klang et al.
patent: 0041229 (1981-12-01), None
patent: 6115980 (1994-04-01), None
patent: 07097240 (1995-04-01), None
XP002158658 Abstract of JP 06115980 (Sekisui Chemical Co Ltd. Japan) Apr. 26, 1994.

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