Asahi Kasei Kogyo Kabushiki Kaisha

Asahi-dow Limited

Tokio Sakurai

Akihiko Ikeda

Isamu Iwami

Sadao Ibe

Yoshiharu Kitahama

Tsutomu Abe

Yoshihiko Mori

Yoshiro Unno

Kazuhiro Takahashi

Kyosuke Komiya

There is disclosed a novel method for producing a polyphenylene ether, in which a phenol compound is reacted with an oxidizing agent in a reaction medium in the presence of a highly active catalyst comprising at least one copper compound, at least one 1,3-diamine compound selected from N,N,N',N'-tetramethyl-1,3-diaminopropanes and at least one halogen compound selected from a bromine compound and a chlorine compound, wherein the reaction medium contains at least one alcohol selected from the group consisting of methanol and ethanol. The novel method can be advantageously employed for efficiently producing a polyphenylene ether which has a desirable color and gives a composition improved with respect to Izod impact strength in combination with a rubber-reinforced polystyrene and the like. Major application of such a composition is found in the field of generally known engineering plastics.

Method for producing a polyphenylene ether

Manufacture of orthomethylated phenol compounds by the reaction of phenol compounds having a hydrogen atom at the ortho position and methanol is accomplished advantageously by a method which effects the reaction by use of a catalyst comprising (A) iron oxide, (B) indium oxide, and (C) at least one member selected from the group consisting of chromium oxide and silicon oxide. According to this method, the reaction permits the orthomethylated phenol compound to be produced in high yields for a long time because of the catalyst's excellent activity-retaining property. Since the ortho-position selectivity and the utilization ratio of methanol are high and, consequently, the utilization efficiency of raw materials is high, the method of this invention produces the orthomethylated phenol compound with high efficiency from the phenol compounds.

Method for manufacture of orthomethylated phenol compounds

An adsorbent comprising a porous copolymer produced by copolymerizing a cross-linkable monomer and a mono-ethylenically unsaturated monomer, said copolymer having pores of an average pore diameter (d) of 500 A to 6,000 A and having such a broad pore diameter distribution that the pore volume having a pore diameter in the range of from 0.5 d to 2 d is not more than 60% of the total pore volume in the copolymer. By the use of such a porous copolymer having a specific composition and pore characteristics, organic compounds (e.g. toxic compounds) adsorbed on the proteins (e.g. plasma proteins) present in intercellular and/or extracellular liquids (e.g. blood) can be effectively adsorption-removed. Especially when the present adsorbent is used for purification of blood, it is advantageously subjected to such a pretreatment that plasma proteins are adsorbed on the adsorbent and then crosslinked with a crosslinking agent. The pretreated adsorbent can prevent unfavorable adsorption of blood platelets and leukocytes thereon. The present adsorbent is quite suitable for use in a column type purifier apparatus.

Adsorbent for adsorbing organic compounds adsorbed on proteins

Growing community of inventors

Yokohama, Japan

Tokio Sakurai