Process for the preparation of polymeric acetal carboxylates

Details Process for the preparation of polymeric acetal carboxylates Process for the preparation of polymeric acetal carboxylates

1979-10-22

1980-10-07

Phynes, Lucille M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525398, 528494, C08F28306, C08L 6102

Patent

active

042269601

ABSTRACT:
The alkali metal, ammonium and alkanol ammonium salts of polymeric acetal carboxylates are stable detergent builders under laundry use conditions but depolymerize at lower pH, making the polymer fragments more readily biodegradable in waste streams. Such polymeric acetal carboxylates can now be made by an improved process which includes the steps of bringing together in a reaction zone under polymerization conditions an ester of glyoxylic acid and a polymerization initiator, and adding an alkyl vinyl ether to the resulting polymer in the presence of a solvent having a dielectric constant of at least 15, such as an alkyl nitrile and a haloacetic acid catalyst, such as trifluoroacetic acid, to stabilize the polymer against rapid depolymerization in alkaline solution. The preferred solvent is acetonitrile.

REFERENCES:
patent: 4140676 (1979-02-01), Crutchfield et al.
patent: 4144226 (1979-03-01), Crutchfield et al.
patent: 4146495 (1979-03-01), Crutchfield et al.

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