synthetic linear polyesters and shaped structures higher speed riding was it

摘要

Permanently flame-resistant synthetic linear polyesters are obtained by incorporating by condensation into the polyester composed of the usual dicarboxylic acid and diol units an alkylphosphine oxide of the formula WHEREIN THE RADICALS R to R4 represent organic radicals of which R2, R3 and Z may be substituted by 2 hydroxyl groups altogether, R2, R3 and R4 may also represent hydrogen and a is zero or a whole number of from 1 to 4. The flame-resistant polyesters are processed into shaped structures such as fibers, filaments, sheets, injection and compression molded articles characterized by good flameproofness and dyeing properties.