Method for anionic polymerization of lactames
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United States of America Patent
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Mar 30, 2004
Grant Date -
N/A
app pub date -
Jan 29, 2002
filing date -
Mar 26, 1999
priority date (Note) -
Expired
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Abstract
The invention relates to a novel process for the anionic polymerization of lactams, in which: (a) (i) a catalyst capable of creating a lactamate and (ii) a regulator chosen from the amides of formula R1--NH--CO--R2, in which R1 can be substituted with a radical R3--CO--NH-- or R3--0-- and in which R1, R2 and R3 denote an aryl, alkyl or cycloalkyl radical, are dissolved in the molten lactam; the temperature of this reaction mixture being between the melting point of the lactam and 15.degree. C. higher in order to ensure its good stability, (b) the solution from step (a) is introduced into a mixing device and is then heated to a temperature which is sufficient to obtain bulk polymerization of the lactam in no more than 15 minutes. (b) is usually a continuous reactor, for example an extruder; however, it can be replaced with a mold.
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