Direct polyoxyalkylation of glycerine with double metal...

C - Chemistry – Metallurgy – 08 – G

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C08G 65/28 (2006.01)

Patent

CA 2301210

Acidification, neutralization, or removal of basic impurities from acid sensitive low molecular weight starter or acidification of a reactor heel prior to addition of acid sensitive low molecular weight starter allows direct oxyalkylation of continuously added acid sensitive low molecular weight starter to produce polyoxyalkylene acid sensitive low molecular weight starter-initiated or co-initiated polyols in the presence of a double metal cyanide catalyst. The preferred acid sensitive low molecular weight starter is glycerine.

L'acidification, la neutralisation d'une amorce de faible poids moléculaire sensible aux acides ou l'enlèvement de ses impuretés basiques ou bien l'acidification d'un fond de réacteur avant adjonction d'une amorce de faible poids moléculaire sensible aux acides permet de réaliser l'oxyalkylation directe d'une amorce de faible poids moléculaire sensible aux acides, laquelle amorce est ajoutée sans interruption, et ce, afin de produire des polyoxyalcène polyols amorcés ou co-amorcés par une amorce de faible poids moléculaire sensible aux acides en présence d'un catalyseur double au cyanure pour métaux. L'amorce de faible poids moléculaire sensible aux acides préférée est la glycérine.

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