Ytterbium(III) acetylacetonate as a catalyst for the preparation of aliphatic oligocarbonate polyols

Oligocarbonate diols (I) having a number average mol. wt. of 500-5000 g/mol are prepared by transesterification of organic carbonates with aliphatic polyols in the presence of ytterbium (III) acetylacetonate. An independent claim is included for an NCO-terminated polymer prepared by reaction of a st...

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Bibliographic Details
Main Author HOFACKER STEFFEN DR
Format Patent
LanguageEnglish
Published 16.05.2007
Subjects
ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAININGELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN,SULFUR, SELENIUM OR TELLURIUM
CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY
CHEMISTRY
COMPOSITIONS BASED THEREON
MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
METALLURGY
ORGANIC CHEMISTRY
ORGANIC MACROMOLECULAR COMPOUNDS
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
THEIR PREPARATION OR CHEMICAL WORKING-UP
THEIR RELEVANT APPARATUS
TRANSPORTING
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Summary:Oligocarbonate diols (I) having a number average mol. wt. of 500-5000 g/mol are prepared by transesterification of organic carbonates with aliphatic polyols in the presence of ytterbium (III) acetylacetonate. An independent claim is included for an NCO-terminated polymer prepared by reaction of a stoichiometric excess of organic (poly)isocyanates with oligocarbonate diols (I).
Bibliography:Application Number: CN200410059588