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US 4,734,523 AGranted
Oxalkylated polyester-amines, a process for their preparation and their use
AssigneeHoechst Aktiengesellschaft
InventorsManfred Hofinger, Willibald Bose, Martin Hille, Roland Bohm, Friedrich Staiss
Life of this patent
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Abstract
Oxalkylated polyester-amines which are prepared by esterifying, with polycondensation, an oxalkylated primary fatty amine with a diol and with a dicarboxylic acid, are described. These polyester-amines are used as demulsifiers for breaking crude oil emulsions.
Claims6
An oxalkylated polyester-amine of the formula ##STR5## in which R.sup.1 is an alkyl radical or alkenyl radical having 8 to 23 carbon atoms,
- R.sup.2 is H or CH.sub.3 and, arranged in blocks, can also assume both meanings within the chain of the polyoxalkylene radical,
- R.sup.3 denotes an alkylene radical of the formula --(CH.sub.2).sub.x -- in which x is an integer from 1 to 6, or denotes a polyoxalkylene radical of the formula ##STR6## in which R.sup.4 is H or CH.sub.3 and, arranged statistically or in blocks, can also assume both meanings within the chain and c denotes an integer or fractional number from 2 to 80,
- R.sup.5 is an alkylene radical of the formula --(CH.sub.2).sub.y -- in which y denotes an integer from 1 to 8, it being possible for this alkylene radical optionally to carry 1 to 2 OH groups, or R.sup.5 is a vinylene radical,
- a and b are identical or different and denote an integer or fractional number from 1 to 15 and
- n is an integer which can assume values from 2 to 50.
2 more elements
Dependencies are inferred from the claim text.