Nippon Shokubai Co., Ltd.

Hiroyuki Takaki

Tokumasa Ishida

Masahiro Uemura

Masataka Nakamura

Hiroshi Jinno

The hydroxyalkyl acrylate according to the present invention is characterized in that a content amount of an ester generated from acrylic acid dimer and an alkylene oxide is not more than 0.10 mass %. The method for producing a hydroxyalkyl acrylate according to the present invention is characterized in comprising the step of reacting acrylic acid with an alkylene oxide in the presence of a catalyst, wherein a content amount of acrylic acid dimer in the raw material acrylic acid is not more than 3.00 mass %.

Hydroxyalkyl acrylate and method for producing same

The present invention provides an N-phenylmaleimide compound that can improve the quality of the obtained copolymer by using N-phenylmaleimide containing impurities in specific amounts or less as at least one component of the copolymerization monomers. The N-phenylmaleimide compound of the present invention contains 0.1% by weight or less of N-(2,5-dioxo-1-phenyl-3-pyrrolidinyl)-N-phenylmaleamic acid (PPMA) and/or 0.3% by weight or less of N-phenylfumaramic acid (PFA).

N-phenylmaleimide compound and copolymer composition obtained using same

Processes for producing a hydroxyalkyl(meth)acrylate which comprise reacting (meth)acrylic acid with an alkylene oxide in the presence of a catalyst. A first process is characterized in that the amount of the acid ingredient is kept, on calculation, at 0.010 or more in terms of molar ratio to the catalyst present in the liquid reaction mixture and that the liquid reaction mixture from which the hydroxyalkyl(meth)acrylate has been distilled off is used in the subsequent reaction. A second process is characterized in that a dialkylene glycol mono(meth)acylate is supplied to the reaction system to cause the dialkyleneglycol mono(meth)acylate to coexist in the liquid reaction mixture.

Processes for producing hydroxyalkyl (meth) acrylate

The present invention provides: a high-quality hydroxyalkyl (meth)acrylate of which the alkylene glycol di(meth)acrylate content and the acid component content are both low; and its novel production process. The hydroxyalkyl (meth)acrylate, which has a content, in terms of an alkylene glycol di(meth)acrylate as an impurity, of not more than 0.1 weight % and an acid component content of not more than 0.1 weight %, is obtained by a process comprising the step of carrying out a batch reaction between (meth)acrylic acid and an alkylene oxide in the presence of a catalyst in order to produce the hydroxyalkyl (meth)acrylate; with the process making an adjustment as to charging of both raw materials in such a manner that, for, of a time as needed for supplying both raw materials, a supplying time of not less than 40% of a total supplying time when the raw materials as supplied have a temperature of not lower than 40&#xb0; C., the molar ratio of the integrated amount of the alkylene oxide to the integrated amount of the (meth)acrylic acid that have been added to a reactor by then can be more than 1.0.

Hydroxyalkyl (meth)acrylate and its production process

There is disclosed a novel production process for a hydroxyalkyl (meth)acrylate in which: the diffusion of harmful substances due to disposal of catalysts can be reduced; and also the amount of the catalyst as used can be greatly saved in the entire production process. This production process comprises the step of carrying out a reaction between (meth)acrylic acid and an alkylene oxide in the presence of a catalyst in order to produce the hydroxyalkyl (meth)acrylate; with the production process being characterized by further comprising the step of recovering the catalyst as has been used for the reaction.

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Himeji, Japan

Hiroyuki Takaki