| abstract |
POLYOXYMETHYLENE COMPOSITIONS MAY BE STABILIZED BY IN ADDITION OF 0.1 TO 10% OF A POLYMERIC CONDENSATE PREPARED BY REACTING OF DICARBOXYLIC ACID DIBYDRAZIDE, A DIAMINE, AND A UREA, THIOUREA OR DERIVATIVES THEREOF. THE PROPORTIONS OF THE RECTANTS ARE 1:0.15:0.1-10 RESPECTIVELY. THE CONDENSATE IS PREPARED BY HEATING THE REACTANTS AT 50*C.-300*C. FROM 1 TO 20 HOURS IN AIR OR INERT GAS. A POLYACETAL COMPOSITION CONTAINING AS A THERMAL STABILIZER A NITROGEN-CONTAINING TERNARY CONDENSATION POLYMER COMPRISING (A) DICARBOXYLIC ACID DIBHDRZAZIDE, (B) DIAMINE OR POLAMINE AND (C) UREA, UREA DERIVATIVES, THIORUREA OR THIOUREA DERIVATIVES. |