High char yield benzoxazines
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United States of America Patent
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Oct 26, 1999
Grant Date -
N/A
app pub date -
Oct 3, 1997
filing date -
Oct 3, 1997
priority date (Note) -
Expired
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Abstract
Benzoxazine monomers, oligomers and polymers are desirably modified by adding pendant functional groups to either the amine or phenolic reactants. These pendant functional groups can be activated at temperatures generally from about 25.degree. C. to about 300.degree. C. to form chemical bonds between said benzoxazine monomers, oligomers and polymers. The additional chemical bonds increase the thermal stability of benzoxazine polymers such that they can withstand higher use temperature, act as more effective flame barriers, or result in higher amounts of char if used as a precursor to high temperature (600-1000.degree. C. reaction condition) chars.
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