Process for the controlled radical polymerization or copolymerization of ethylene under high pressure in the presence of initiating free radicals and of controlling indoline nitroxide radicals
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United States of America Patent
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Mar 16, 2004
Grant Date -
Aug 7, 2003
app pub date -
Jan 27, 2003
filing date -
Jan 26, 2000
priority date (Note) -
Expired
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Abstract
Polymers are obtained by a radical (co)polymerization of ethylene under high pressure in the presence of at least one initiating free radical (Z*) and of at least one controlling stable free radical (SFR*) which comprises the indoline nitroxide backbone represented by the formula (I). ##STR1## A is a hydrocarbonaceous chain forming an aromatic ring with the two carbon atoms to which it is attached, this ring being able to carry substituents or being able to carry one or more rings placed side by side, which rings are aromatic or aliphatic and optionally substituted, the carbon atoms forming the nitrogenous ring and in the alpha- and beta-position with respect to the nitrogen atom being, able to carry hydrogen atoms or substituents.
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