Polyester compositions having improved color stability
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United States of America Patent
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N/A
Issued Date -
Aug 15, 2002
app pub date -
Jan 22, 2002
filing date -
May 28, 1999
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Polyester resin compositions, including flame retardant compositions, having improved color stability are prepared containing a mixture of polyester resin, e.g., polybutylene terephthalate, a polycarbonate polymer, e.g., a brominated polycarbonate, a quencher concentrate comprising a mixture of a polyester resin and a Group I or II metal phosphate, an antimony compound as a synergist and/or a light-colored pigment, e.g., zinc sulfide. Addition of the quencher compound in the form of resin concentrate rather than in neat form reduces the development of reactions between the quencher and synergist/pigment combination which can cause discoloration of the composition when thermoprocessed.
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