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US 4,233,423 AGranted
Stabilization of polymeric acetal carboxylates using an acetal
AssigneeMonsanto Company
InventorsDavid R. Dyroff, Gary J. Lynch, Victor D. Papanu
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AssigneeMonsanto Company
InventorsDavid R. Dyroff, Gary J. Lynch, Victor D. Papanu
Estimating the term…
The alkali metal, ammonium and alkanol amine salts of polymeric acetal carboxylates are stable detergent builders and chelating agents. Now, in the improved process of the present invention for preparing an acetal carboxylate polymer wherein a glyoxylate ester and a polymerization initiator are brought together under polymerization conditions and a chemically stable end group is added to the termini of the resulting polymer to stabilize the polymer against rapid depolymerization in alkaline solution, the improvement comprises contacting the resulting polymer in the presence of an acid catalyst with a sufficient amount of an acetal having 3 to 20 carbon atoms to stabilize the resulting polymer against rapid depolymerization in alkaline solution, and an agent to remove liberated alcohol.
In a process for preparing an acetal carboxylate polymer wherein a glyoxylate ester and a polymerization initiator are brought together under polymerization conditions, and a chemically stable end group is added to the termini of the resulting polymer to stabilize the polymer against rapid depolymerization in alkaline solution, the improvement which comprises contacting the resulting polymer in the presence of an acid catalyst with a sufficient amount of an acetal having the formula:
Dependencies are inferred from the claim text.