Method for preparing a high molecular weight polyethermide polym

Details Method for preparing a high molecular weight polyethermide polym Method for preparing a high molecular weight polyethermide polym

1991-10-07

1993-02-23

Kight, III, John

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528125, 528126, 528128, 528172, 528175, 528179, 528180, 528181, 528182, 528185, 528188, 528207, 528208, 528350, 528351, 528352, 528353, C08G 7310, C08G 802, C08G 1400

Patent

active

051891379

ABSTRACT:
A method for preparing high molecular weight polyethermide polymers in a dual solvent system is disclosed. The inventive method provides for polymerizing a diamine monomer and a dianhydride monomer in a solvent system comprised of at least two solvents, a first solvent is selected for its solubility characteristics such that the polyethermide polymer is highly soluble therein and a second solvent is selected for its relatively high boiling point characteristics such that when the second solvent and first solvent are mixed together, the boiling point of the dual solvent system is at least as high as the temperature at which polymerization of said monomers occurs. In one embodiment, a diamine monomer of 4,4'-sulfonyl dianiline (SDAN) is reacted with a dianhydride monomer of bisphenol A dianhydride (BPADA) in the presence of a catalyst and a chain stopper in a dual solvent system comprised of chloroform and ortho-dichlorobenzene. The resulting polyethermide has an intrinsic viscosity exceeding 0.76 dl/g in chloroform at 25.degree. C.

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