Patent · US Active

Method for purifying crude polymethylols

US8575401B2 · kind B2 · utility

0Cited by

17References

15Claims

0Family size

Assignee

BASF SE

Inventors

Tilman Sirch · Schifferstadt, DE
Michael Steiniger · Neustadt, DE
Steffen Maas · Bubenheim, DE
Stefan Rittinger · Mannheim, DE

Key dates

Filing date	Dec 7, 2009
Grant date	Nov 5, 2013
Priority date	—
Expiry date	May 21, 2030

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08L75/04
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The present invention relates to a process for purifying crude polymethylol which comprises polymethylol of the formula (I)(HOCH2)2—C—R2 (I)in which each R is independently a further methylol group or an alkyl group having 1 to 22 carbon atoms or an aryl or aralkyl group having 6 to 22 carbon atoms, and also hydroxy acid of the formula (IV)in which each R is independently as defined above, which comprises performing the purification in a distillation column, the bottom of the distillation column being connected to an evaporator with a short residence time.The present invention further relates to a composition comprising polymethylol and 1 to 10 000 ppm by weight of an ester of polymethylol and of a hydroxy acid and to the use thereof.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.