Showa Denko K.k.

Showa Denko Kabushiki Kaisha

Sumio Soya

Makoto Saito

Tohru Yamamoto

Kouhei Morikawa

Akihiro Ohtsubo

Yohko Kataoka

Hiroshi Yasuda

Yuji Kobayashi

Kuniomi Marumo

Kohei Morikawa

Haruaki Ito

Hidejiro Yokoo

Kimitaka Ohshiro

Takashi Tani

Kazuhiro Oomori

Takamitsu Utsukihara

Yasuhito Wakabayashi

A process for producing a cyanobenzoic acid compound, a cyanobenzamide compound, an alkyl cyanobenzoate compound, and a cyanobenzoyl chloride compound, which are useful intermediates for a variety of chemicals such as pharmaceuticals, agrochemicals, liquid crystals, and monomers for functional polymers. One nitrile group of an easily available phthalonitrile compound is selectively hydrolyzed to thereby produce a cyanobenzamide compound with high selectivity and yield. The cyanobenzamide compound thus-produced is transformed under acidic conditions into a cyanobenzoic acid compound and a cyanobenzoate ester compound without the cyano group of the benzene ring being damaged.

Process for producing cyanobenzoic acid derivatives

A high-purity L-ascorbic acid-2-phosphoric acid potassium crystal having excellent stability, and a method for simply producing the high-purity L-ascorbic acid-2-phosphoric acid potassium in a high yield by adding dropwise a solution containing L-ascorbic acid-2-phosphoric potassium to methanol or simultaneously mixing methanol and a solution containing L-ascorbic acid-2-phosphoric acid potassium. By the production method of the present invention, high-purity L-ascorbic acid-2-phosphoric acid potassium crystal having excellent stability can be simply produced in a high yield. The L-ascorbic acid-2-phosphoric acid potassium crystal obtained by the production method of the present invention is used for feedstuff, cosmetic materials, medical products, food additive and the like.

L-ascorbic acid-2-phosphoric acid potassium crystal and method for producing the same

An additive for an admixture of a cement composition, especially, a retarder of a cement composition, capable of exhibiting excellent retardation effect with a smaller addition amount and easily controlling the retardation time by adjusting the addition amount. An admixture of a cement composition, comprising a cement and at least one iminodiacetic acid or salt thereof represented by formula (I):

Admixture of cement composition

A cleaning agent composition which contains as major components an aminodicarboxylic acid N,N-diacetic acid salt, (particularly aspartic acid N,N-diacetic acid salt or glutamic acid N,N-diacetic acid salt) and a glycolic acid salt and of which a cleaning liquid has pH 8.5 or higher. Preferably, the composition further contains anionic surfactant and/or nonionic surfactant or an alkali metal hydroxide. The cleaning agent composition of the present invention has excellent cleaning effect and biodegradability and can be used advantageously as domestic, medical, and industrial cleaning agents.

Cleaning agent composition

The invention is directed to a process for preparing N-phosphonomethylglycine comprising the steps of reacting an aminomethylphosphonic acid with a glyconitrile in the presence of an alkali metal hydroxide to form a product, and then hydrolyzing the product by adding an alkali metal hydroxide in an amount sufficient to neutralize the resulting carboxylic acid.

Method for preparing an N-phosphonomethylglycine

A hydantoin compound of the formula: ##STR1## (wherein R stands for an alkyl group of 8 to 20 carbon atoms) increases the sensitivity of a color developing reaction of a heat-sensitive recording material and enhances the high-speed recording property of the recording material without sacrifice of the whiteness thereof. The heat-sensitive recording material containing the hydantoin compound is novel to the art.

Additive for heat-sensitive recording material, the recording material

A hydantoin compound of the formula: ##STR1## (wherein R stands for an alkyl group of 8 to 20 carbon atoms) increases the sensitivity of a color developing reaction of a heat-sensitive recording material and enhances the high-speed recording property of The recordig matvrial Without sacifice of the whiteness thereof. The heat-sensitive recording material containing the hydantoin compound is novel to the art.

Growing community of inventors

Kawasaki, Japan

Sumio Soya