Mitsubishi Petrochemical Company Limited

Sumitomo Chemical Company, Limited

Katsuhiro Abe

Kazunori Yano

Kenji Nagaoka

Yoshiharu Tatsukami

Ryuhei Matsui

Yoshinobu Kobayashi

Shigeki Kiriyama

Masahiro Fujiwara

Shin-ichi Yamauchi

Hiroshi Takahashi

Shigekazu Ohi

Kazunobu Nakamori

Mitsushige Baba

Teruhisa Goto

Mitsuo Tsuruoka

Akira Ohkubo

A process for producing a polyphenylene ether is disclosed, comprising oxidatively polymerizing a phenol in an organic solvent in the presence of a catalyst for oxidative polymerization, finely dispersing the resulting polyphenylene ether containing the organic solvent in an aqueous dispersion medium containing an acid compound, and heating the aqueous dispersion to remove the solvent from the polyphenylene ether. The resulting polyphenylene ether has excellent powder properties and contains a reduced amount of a catalyst residue.

Process for producing polyphenylene ether, dispersing polyether in

A process for producing a plyphenylene oxide is disclosed, comprising oxidative polymerization of a nucleus-substituted phenol with an oxygen-containing gas in an organic solvent in the presence of a catalyst system comprising a manganese compound containing at least one divalent manganese salt, at least one basic compound selected from hydroxides, alkoxides or phenoxides of the group IA metals of the Periodic Table and hydroxides or oxides of the group IIA metals of the Periodic Table, an alkanolamine represented by formula (I)

Process for producing polyphenylene oxide with alkanolamine and

Polyphenylene ether compositions comprising a polyphenylene ether, an alkenylaromatic polymer, a rubber substance, a polyethylene or ethylenic copolymer, and a mineral oil. These polyphenylene compositions are excellent in the balance among fluidity, impact resistance and gloss.

Polyphenylene ether compositions

A composition comprising an amorphous resin (excluding polyphenylene ether) and a specific diamide compound of the formula ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 are defined in the specification. The moldability of the amorphous resin is improved without reducing its heat resistance.

Thermoplastic resin composition having improved moldability comprising

Polyphenylene ethers are produced by oxidative polymerization of phenols in the presence of a catalyst comprising the combination of divalent manganese salts, an oxine or derivatives thereof, an alkanolamine, and an alkaline compound. This catalyst has an increased polymerization activity and achieves a higher productivity. In addition, the catalyst enables the polymerization to conduct at relatively high temperatures.

Process for producing polyphenylene ether

A composition comprising a polyphenylene ether, a polystyrene, a polyphenylene ether-grafted polyolefin and, optionally, a polystyrene-grafted polyolefin is disclosed. This composition has excellent impact resistance and, due to dispersion phase being a crystalline resin, an excellent rigidity.

Polyphenylene ether resin composition

Polymers consisting essentially of the units (A) and (B) with an intrinsic viscosity in the range of 0.3 to 4.0, a content of the unit (A) of 10 to 90 mol % of the total structural units and a content of double bonds of trans-configuration of 40% or more are disclosed. The units (A) and (B) are represented by the structural formulas: ##STR1## wherein R' is hydrogen atom, an alkyl or phenyl, R.sup.2 is hydrogen or an alkyl, R.sup.3 is an alkyl. The polymers are preferably prepared by partial hydrolysis of the polymers consisting essentially of the unit (B).

Ring-opened norbornyl polymers

Aqueous dispersions of olefin resins having a low film-forming temperature can be continuously produced by homogeneously mixing a mixture composed of olefin resin, partially saponified polyvinyl alcohol and water by means of an extruder having a multi-screw, and extruding the resulting dispersion. If partially saponified polyvinyl alcohol in which residual acetic acid groups are blocked is used, the film-forming temperature thereof is effectively lowered.

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Mie, Japan

Katsuhiro Abe