Polyvinyl butyrals having improved thermal stability and light resistance
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United States of America Patent
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Jan 24, 1995
Grant Date -
N/A
app pub date -
May 6, 1993
filing date -
May 8, 1992
priority date (Note) -
Expired
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Abstract
Polyvinyl butyrals (PVBs) with improved thermal stability and improved light resistance contain as stabilizers polynuclear phenols which phenolic radicals have a quaternary carbon atom in the para-position to the phenolic hydroxyl group and if desired in combination with synergistically acting, nitrogen-containing, sulfur-containing or phosphorus-containing co-stabilizers of the types a) to d). The use of the resulting films of low yellowness as interlayer films having substantially reduced yellowing for the production of laminated glasses and glass composites of silicate glass sheets is described.
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