Nippon Shokubai Co., Ltd.

Takehiko Morita

Hiroshi Yamamoto

Takashi Abe

Yoshiaki Hirano

Shin-ya Imoto

Hikaru Takahashi

Takafumi Kubo

Morihiro Kitamura

Tatsuhiko Akiyama

Yuichi Kita

Kazuo Kishino

Kenichi Takematsu

Yutaka Sugiyama

Hitoshi Kanei

Kouichi Nakagawa

Yasuhiro Kume

High purity cyclohexasilane and a method for increasing the purification efficiency thereto are provided. The method for producing cyclohexasilane of the present invention is characterized in that, in distilling crude cyclohexasilane to obtain purified cyclohexasilane, the absolute pressure during distillation is set to 2 kPa or less, and the heating temperature of crude cyclohexasilane is set to 25 to 100&#xb0; C. The cyclohexasilane of the present invention contains pure cyclohexasilane at a rate of 98% by mass or more and 100% by mass or less.

Cyclohexasilane

Method for producing cyclohexasilane

It is an object of the present invention to provide a basic crosslinked polymer having excellent ion exchange and catalyst properties with high resistance to thermal degradation which is, therefore, useful for a broad range of application, a method for producing said crosslinked polymer with great ease and high efficiency, and methods of using said crosslinked polymer. A crosslinked polymer having a tertiary amine and/or a quaternary ammonium salt structure, said crosslinked polymer has a tertiary amine structure at either end of at least one crosslink structure.

Crosslinked polymer, method for manufacturing it and use thereof

Crosslinked polymers excellent in ion exchange capacity and catalytic activity and in resistance to thermal decomposition and widely applicable in various fields of use; a crosslinking agent which is suited for use as a raw material in the production of crosslinked polymers; a method of producing crosslinked polymers; a method of producing a spherical particle which is suited for use in the production of crosslinked polymers; a method of producing a hydroxy alkyl (meth)acrylate; and a method of producing glycols using the crosslinked polymers are provided. The crosslinked polymer has at least one crosslink structure and a tertiary amine structure and/or a quaternary ammonium salt structure, wherein at least one crosslink structure is represented by the following general formula (1):

Crosslinked polymers containing tertiary amine and/or quaternary ammonium salt structures, processes for making and uses thereof

Acrylic monomer composition, acrylic copolymer, and heat resistant resin

In the production of an N-unsubstituted maleinimide by the ring-closing alcohol-removing treatment of an N-unsubstituted maleinamic ester for conversion into an imide, an acid catalyst or a mono(cyclo)alkyl sulfuric ester is used for the reaction. In this case, the alcohol concentration in the reaction solution is preferable to be adjusted to a low level. By using a maleinamic acid and an alcohol in conjunction with an inert solvent and an acid catalyst, a mixture of maleinamic acid with an acid catalyst, or a mono(cyclo)alkyl sulfuric ester, a corresponding maleinamic ester is obtained. In a method for the production of a maleinamic acid by the reaction of maleic anhydride with ammonia in an inert solvent, the maleinamic acid is obtained by placing a solution of the maleic anhydride in the inorganic solvent in a reactor, meanwhile introducing ammonia gas into the empty space part of the reactor, and allowing the ammonia gas to be absorbed in the solution through the surface of contact between the solution and the ammonia gas. Further, in the method for the production of a maleinamic acid by the reaction of maleic anhydride with ammonia in an inert solvent, the reaction is carried out while the concentration of the maleic anhydride in the reaction solution is kept at a level of not more than 10% by weight or the ammonia concentration in the reaction solution is kept at a level of not less than 0.001% by weight.

Method for production of maleinamic acid, esters thereof, and maleinimide

Growing community of inventors

Ibaraki, Japan

Takehiko Morita