Hitachi, Ltd.

Hitachi Chemical Company, Ltd.

Tadashi Muroi

Hitoshi Yokono

Junji Mukai

Toshikazu Narahara

Masahiko Ishida

Shunichi Numata

Katuo Sugawara

Norio Shimizu

Yoshiharu Karasawa

Mineo Nakano

Mikio Manabe

Yoshitaka Oguri

Proteins contained in microbial cells, for example, cells of petroleum-assimilable yeast, are separated and purified by extracting proteins from microbial cells, treating the resulting extract solution with a cation exchanger, treating said cation exchanger containing the adsorbed proteins with a volatile basic substance in the presence of water thereby to desorb or elute the adsorbed proteins, removing said basic substance dissolved in the resulting eluate by evaporation, and then concentrating the eluate thereby to obtain the dissolved proteins.

Process for recovering microbial cellular proteins

A novel thermosetting resin can be obtained by mixing 1 equivalent or more of a polyfunctional isocyanate per 1 equivalent of a polyfunctional epoxide and then carrying out a polymerization reaction of the mixture in the presence of the catalyst which forms isocyanurate rings and oxazolidone rings so as to enable the mixture to form 2 or more isocyanurate rings directly connected with oxazolidone rings through an isocyanate residues. The resulting thermosetting resin has excellent electrical, chemical and impact resistances and excellent self-extinguishing properties. Said resin is used as an electric insulating material.

Novel thermosetting resin and a process for producing same

A thermosetting resin composition is derived from a modified novolak-type resin obtained by the reaction of a phenolic compound with an aralkyl halide or ether. The thermosetting resin is composed of 20 to 80 parts by weight of a thermosetting resin prepared by reacting a modified novolak-type resin represented by, for example, the general formula, ##SPC1## Wherein R is an aromatic nucleus, with formaldehyde in the presence of a basic catalyst, and, in admixture therewith, 80 to 20 parts by weight of a thermosetting resin prepared by reacting the above-mentioned modified novolak-type resin with hexamethylenetetramine. The thermosetting resin is quickly curable and gives a cured article excellent in heat resistance.

Thermosetting resins

Growing community of inventors

Hitachi, Japan

Tadashi Muroi