Process for the preparation of high molecular weight polycondens

Details Process for the preparation of high molecular weight polycondens Process for the preparation of high molecular weight polycondens

1995-10-05

1998-12-29

Hampton-Hightower, P.

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528179, 528182, 528188, 528480, 528502R, 528503, 525420, C08G 6928, C08G 6378, C08G 8500, C08G 6948

Patent

active

058543724

ABSTRACT:
To prepare nitrogen-containing polycondensates, a starting substance which still contains reactive end groups is dispersed in a high-boiling inert solvent, preferably in the presence of a dispersing auxiliary, low molecular weight by-products are distilled off at elevated temperature, the batch is cooled and the dispersed polycondensate is isolated. To prepare the starting substance, a mixture of at least two monomers which react with one another is heated up to a constant reaction temperature, a melt being formed at least in part, but initially no homogeneous melt occurring. The reaction is continued until a homogeneous melt is present. The precondensate formed is then dispersed in the high-boiling inert solvent and the condensation reaction is brought to completion.

REFERENCES:
patent: 3925295 (1975-12-01), Osborn et al.
patent: 4102846 (1978-07-01), Bentley et al.
patent: 5140098 (1992-08-01), Pipper et al.

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