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US 4,816,553 AGranted
Polyacetals, preparation thereof from dialdehydes and polyolcarboxylic acids, and use of same
AssigneeBASF SE
InventorsRichard Baur, Rolf Fikentscher, Alfred Oftring, Felix Richter, Wolfgang Trieselt, Paul Diessel, Ekhard Winkler, Johannes Perner
Life of this patent
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Abstract
Polyacetals obtainable by reaction of (a) a dialdehyde of the formula OHC--A.sub.n --CHO where A=C.sub.1 -C.sub.4 -alkylene or ##STR1## and n is 0 or 1, is reacted with (b) a polycarboxylic acid of 5 to 7 carbon atoms which contains not less than 3 OH groups, in a molar ratio (a):(b) of 1:0.25 to 4 in an aqueous medium in the presence of an acid catalyst, are used as additives in washing agents and as complexing agents for heavy metal ions.
Claims7
A polyacetal obtainable by reaction of
- (a) a dialdehyde of the formula
- OHC--A.sub.n --CHO
- where
- A is ##STR7## and n is 0 or 1, with
- (b) a polycarboxylic acid of 5 to 7 carbon atoms which contains not less than 3 OH groups,
- in a molar ratio (a):(b) of 1:0.25 to 4 in an aqueous medium in the presence of an acid catalyst.
3 more elements
Dependencies are inferred from the claim text.