PVB Film for Composite Safety Glass and Composite Safety Glass
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United States of America Patent
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Issued Date -
Nov 17, 2005
app pub date -
Oct 18, 2004
filing date -
Oct 11, 2001
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
Composite glass with films based on partially acetalated polyvinyl alcohol containing a softening agent, especially PVB based, as an intermediate layer with magnesium salts or calcium salts of organic acids as an adhesion-reducing additive (anti-adhesive agent) exhibit large amounts of fluctions with regard to adhesion when the composite glass is subjected to thermal stress. According to the invention, phosphorous compounds are used, selected from the group consisting of organophosphites i.e. esters of phosphorinic acid with organic radicals, organophosphates, i.e. esters of orthonophosphoric acid, as an additive which during further processing compensates for fluctations in adhesion in films based on partially acetalated polyvinyl alcohol containing a softening agent. The invention is used in the production of films for the manufacture of safety glass, especially used in the building and automotive industry.
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