Nippon Shokubai Co., Ltd.

Nippon Shokubai Kagaku Kogyo Co., Ltd.

Nippon Shokubai

Sokubai Kagaku Kogyo, Co., Ltd.

Kazuo Kishino

Yuichi Kita

Fumioki Shimoyama

Hitoshi Kanei

Kinichi Nakayama

Hiroko Ueda

Kenichi Ueda

Teruyuki Kanto

Kazumi Fujioka

Kentaro Sakamoto

Takehiko Morita

Akio Fukui

Koichi Nakagawa

Masakazu Nakagawa

Takeshi Okuno

Yasuhiro Kume

An acrylonitrile solution of maleimide manifesting transparency, precluding coloration and opacification during the course of handling, and excelling in stability, a method for the preparation of the acrylonitrile solution, and an acrylonitrile based copolymer obtained by using the acrylonitrile solution are provided. The acrylonitrile solution of maleimide is such that, when it is subjected to a forced coloration test, the differences &Dgr;L, &Dgr;a, &Dgr;b values (invariably as absolute values) each between L, a, and b values before and after the test are respectively not more than 5, not more than 5, and not more than 10. The acrylonitrile solution of maleimide is prepared by lowering the water content in the acrylonitrile solution to a level of not more than 0.1% by weight, or causing the acrylonitrile solution to permit coexistence therein of a polymerization inhibitor and lowering the water content in the acrylonitrile solution to a level of not more than 0.3% by weight.

Acrylonitrile solutions of maleimides, method for preparation thereof, and acrylonitrile based copolymers obtained by use of the solutions

Raw material used for producing heat-resistant resins, heat-resistant

An acrylonitrile solution of maleimide manifesting transparency, precluding coloration and opacification during the course of handling, and excelling in stability, a method for the preparation of the acrylonitrile solution, and an acrylonitrile based copolymer obtained by using the acrylonitrile solution are provided. The acrylonitrile solution of maleimide is such that, when it is subjected to a forced coloration test, the differences .DELTA.L, .DELTA.a, and .DELTA.b values (invariably as absolute values) each between L, a, and b values before and after the test are respectively not more than 5, not more than 5, and not more than 10. The acrylonitrile solution of maleimide is prepared by lowering the water content in the acrylonitrile solution to a level of not more than 0.1% by weight, or causing the acrylonitrile solution to permit coexistence therein of at least one member selected from the group consisting of alkyl-substituted hydroxybenzenes and hindered phenols and at least one member selected from the group consisting of phosphorous esters, phosphoric esters, phosphine, and phosphoric acid amides, or lowering the water content in the acrylonitrile solution to a level of not more than 0.3% by weight and causing the acrylonitrile solution to permit coexistence therein of at least one member selected from the group consisting of alkyl-substituted hydroxybenzenes, hindered phenols, phosphorous esters, phosphoric esters, phosphine, and phosphoric acid amides.

Acrylonitrile solutions of maleimides, method for preparation thereof,

Maleimide compounds having improved in storage stability

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

A method for handling a maleimide, which method comprises handling said maleimide in the presence of a stabilizer at a temperature exceeding the melting point thereof in a state kept in contact with a gas phase having a molecular oxygen content of not more than 10% by volume.

Method for handling maleimides

The present invention is directed to an acrylonitrile maleimides solution composition of highly desirable shelf like, having the acid component in said acrylonitrile maleimides soltuion adjusted to a level of no more than 0.1% by weight based on the amount of said maleimides contained in said solution and having a polymerization inhibitor in said solution adjusted to a level in the range of 0.0001 to 1% by weight based on the amount of said solution, and a method for the production thereof.

Acrylonitrile maleimides solution composition of improved shelf life and

Method for the transportation or storage of N-phenyl maleimide, which method comprises mixing N-phenyl maleimide with maleic anhydride in a ratio of 1 to 90 parts by weight of N-phenyl maleimide to 99 to 10 parts by weight of maleic anhydride and handling the resultant mixture in a molten state in the presence of a polymerization inhibitor, and a composition of liquid state.

Method for transportation and storage of N-phenyl maleimide in molten

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Himeji, Japan

Kazuo Kishino