Method for separating a compound obtained by polymerization of non-transformed monomer isocyanates
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United States of America Patent
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Dec 10, 2002
Grant Date -
N/A
app pub date -
Jun 15, 2000
filing date -
Nov 4, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
This invention relates to a process for separating one (or more) oligomeric or polymeric compound(s) (A) obtained by polymerization of isocyanate monomers (A.sub.1) or copolymerization of isocyanate monomers with another polymerizable compound (A.sub.2), in particular a polyol, the said compound(s) A having a viscosity (a), from the unconverted monomer(s), this process comprising addition to the said compound(s) (A) of one (or more) compound(s) (B) consisting of the product of polymerization of isocyanate monomers (B.sub.1) or of copolymerization of isocyanate monomers with another polymerizable compound (B.sub.2), in particular a polyol, the said compound(s) (B) having a viscosity (b) and the ratio of the viscosities b/a being less than 1/1.5, preferably less than 1/2, and co-distillation of (A) and (B), in order to separate the compound(s) (A) from the corresponding unconverted monomers.
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