Stauffer Chemical Company

Ki Soo Kim

Siegfried Altscher

Arthur J Yu

Polyester compositions containing an effective amount for flame retardancy of a copolymer of (1) benzene phosphorus oxydichloride, (2) 2,4'-thiodiphenol, 4,4'-thiodiphenol, 2,4'-sulfonyl diphenol, 4,4'-sulfonyl diphenol or mixtures thereof, and (3) POCl.sub.3 are disclosed.

Polyester composition containing a benzene phosphorus oxydichloride, a

The recovery of a polymer product formed by condensing an organo-phosphonic acid dichloride or dibromide, a dihydroxy aromatic compound and, optionally, a crosslinking momomer in an organic solvent reaction medium, as a granular solid is accomplished by combining said organic solvent containing the polymer product and an aqueous solution which contains an effective amount of suspending agent to later induce precipitation of said polymer product and by thereafter agitating the solution while removing the solvent therefrom to affect precipitation of said granular polymer product.

Process for removing polymer from reaction mixture

Flame retardant polymers of benzene phosphorus oxydichloride, 4,4'-thiodiphenol and POCl.sub.3 are disclosed which are preferably formed by reacting these monomers in an inert organic solvent at ambient temperature in the presence of an amine acid acceptor.

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Irvington, NY, United States of America

Ki Soo Kim