Stabilization of polymers with styrenated-p-cresols
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United States of America Patent
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Jun 5, 2012
Grant Date -
Aug 28, 2008
app pub date -
Feb 11, 2008
filing date -
Feb 26, 2007
priority date (Note) -
Expired
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Abstract
Disclosed herein is a process for the preparation of a mixture of styrenated p-cresol species that is liquid at room temperature and has a viscosity of less than 40,000 cps at 25° C., wherein said process affords 2,6-distyrenated p-cresol assaying at 70% minimum by GC area percent, comprising reacting styrene with p-cresol at a molar ratio of 1.85 to 2.1:1, respectively, in the presence of an acid catalyst at elevated temperature, wherein said mixture comprises monostyrenated-p-cresol, distyrenated-p-cresol, and tristyrenated-p-cresol and exhibits an acid number of less than 0.1 mg KOH/gram.
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