C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/188
C08G 63/68 (2006.01) C08G 63/692 (2006.01) C08G 79/04 (2006.01) D01F 6/84 (2006.01)
Patent
CA 1054747
PROCESS FOR THE MANUFACTURE OF FLAME RETARDING LINEAR POLYESTERS Abstract of the disclosure: In an improvement of the process of Patent Application Serial No. 209 323 , according to which flame retard- ing linear polyesters are manufactured by reaction of dicarboxy- lic acidscapable of forming high molecular weight linear poly- esters or the esters thereof with lower aliphatic alcohols, with diols, and phosphorus compounds of the formula Image or the esters thereof with lower aliphatic alcohols or also the cyclic anhydrides thereof, the cyclic anhydrides are used after having been dissolved previously at elevated temperature in a diol suitable for the polyester manufacture, preferably in the diol used as main component. The symbols of the formula have the following meanings: R = saturated open-chain or cyclic al- kylene, arylene or aralkylene, R1= alkyl having up to 6 carbon atoms, aryl or aralkyl; R as well as R1 optionally containing 1 or more hetero atoms, preferably F, Cl, Br, O or S. By dis- solving the cyclic carboxyphosphinic acid anhydrides in a diol before adding them to the polyester manufacturing batch the formerly necessary comminution of the hydroscopic cyclic anhy- drides with absolute exclusion of moisture may be omitted, and furthermore it is possible to expose the anhydrides to the ele- vated polycondensation temperatures for a short time only.
239745
Bollert Ulrich
Lohmar Elmar
Ohorodnik Alexander
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