Crosslinked phenoxyphosphazene compounds, process for the preparation thereof, flame retardants, flame-retardant resin compositions, and moldings of flame-retardant resins
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United States of America Patent
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Mar 4, 2003
Grant Date -
N/A
app pub date -
Feb 12, 2001
filing date -
Aug 13, 1998
priority date (Note) -
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Abstract
This invention provides a halogen-free flame retardant which advantageously has a high melting point and a low volatility and does not impair the inherent properties of resins. The flame retardant of the invention is a phosphazene compound crosslinked with a crosslinking group such as a phenylene group, wherein each of the crosslinking groups is interposed between the two oxygen groups left after the elimination of phenyl groups from the phosphazene compound; the crosslinked phenoxyphosphazene compound does not have any free hydroxyl groups (derived from crosslinking groups); and the amount of the phenyl groups in the crosslinked compound is 50 to 99.9%, based on the total number of the phenyl groups in the phosphazene compound.
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