Process for preparing copolymers by anionic solvent-free polymerization
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United States of America Patent
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Feb 8, 2011
Grant Date -
Dec 18, 2008
app pub date -
Nov 28, 2006
filing date -
Nov 28, 2005
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Expired
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Abstract
The invention concerns a process for preparing a block or comb copolymer comprising at least one hydrophilic portion and at least two hydrophobic portions, by anionic solvent-free polymerization of a prepolymer selected from a polyethylene glycol and a polyvinyl alcohol, and of a lactone or dilactone monomer. The process is carried out in the presence of an alkaline-earth metal hydride, in an inert atmosphere, and the polymerization step is not carried out under vacuum. The invention also concerns copolymers obtained by this process.
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