Stabilization of barium, strontium and calcium complexes of poly

Details Stabilization of barium, strontium and calcium complexes of poly Stabilization of barium, strontium and calcium complexes of poly

1977-03-24

1978-08-08

Lee, Lester L.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

81155, C08G 7308, C08L 7906

Patent

active

041056205

ABSTRACT:
A process for the stabilization of a polymer which is a barium, strontium and/or calcium complex of polyterephthaloyl oxalamidrazone or polydiphenylether-dicarboxylic acid-4,4'-oxalamidrazone wherein the polymer is treated in an acidic to neutral aqueous solution, e.g. at pH of 1 to 7, containing an acid or salt compound selected from the group consisting of oxalic acid, alkali oxalate, alkali sulfite, alkali hydrogen sulfite, alkali dithionite and alkali hydrogen sulfate. The resulting product has a much improved resistance to UV, oxidation and hydrolysis. Such polymers are especially useful in the form of flame-retardant threads, yarns, filaments, fibers, felts, fabrics and the like.

REFERENCES:
patent: 3661502 (1972-05-01), Meyer et al.
patent: 3661836 (1972-05-01), Schopf et al.

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