Kanegafuchi Kagaku Kogyo Kabushiki Kaisha

Miyuki Azuma

Masahiro Asada

Kazuya Yonezawa

Hiroshi Iwakiri

A process for isolating or recovering a polymer in the form of particles or powder from a solution thereof which comprises admixing a solution of the polymer in a substantially water-immiscible organic solvent with an aqueous solution of a water-soluble polymeric dispersing agent, and distilling away the organic solvent from the mixture in the form of a dispersion.

Process for isolating polymer

A polyesteramide having structural units of the general formula: ##STR1## wherein Ar is a bivalent aromatic group comprising at least 10% by mole of a group having the following formula: ##STR2## in which R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are the same or different and each is methyl group or ethyl group, and structural units of the general formula: ##STR3## wherein R is a bivalent organic group. At least 10% by mole of a bifunctional phenol compound to be used is a tetraalkylbisphenol-F, and whereby the obtained polyesteramide has improved hydrolysis resistance and electric characteristic with an excellent heat resistance.

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Nishinomiya, Japan

Miyuki Azuma