Kao Corporation

Kazuhito Miyoshi

Yasumitsu Sakuma

Hiroyuki Yamashita

Osamu Tabata

Masahiro Umehara

Hisashi Goda

Kazunori Aizawa

Hiroyuki Imoto

Tatsuya Horibata

Taiji Nakamae

Yukiko Oshima

Kenichi Nishikawa

To provide an anionic surfactant powder comprising a polyoxyalkylene ether sulfate which powder has high stability in hard water, high low-temperature solubility and is improved in powder characteristics such as caking characteristics, and a method of producing the anionic surfactant powder. An anionic surfactant powder comprising polyoxyalkylene alkyl ether sulfates in which the average addition mol number of alkylene oxides is 0.05 to 2, wherein the content of the polyoxyalkylene alkyl ether sulfates provided with alkylene oxides added thereto in an amount of 4 mol or more is 30 % by weight or less based on the total anionic surfactant, an anionic surfactant powder further comprising a water-soluble inorganic salt, a method of producing each of these anionic surfactant powders, and a detergent composition and a cement additive comprising these anionic surfactant powders.

Anionic surfactant powder

The invention provides a granular anionic surfactant and a detergent composition blended with the same. Disclosed are a process for producing a granular anionic surfactant, which including stirring particles containing 50 to 100 wt % of an anionic surfactant at a temperature at which the anionic surfactant exhibits thermoplasticity at a stirring Froude number as defined below by equation (i) of 0.1 or more and less than 2.0; a granular anionic surfactant obtained by the process; a granular anionic surfactant having a surface roughness (Ra) of 1.0 &#x3bc;m or less; and a detergent composition comprising the granular anionic surfactant./[()]&#x2003;&#x2003;(i)wherein Fr is Froude number, V is the peripheral speed at the top of a stirring blade [m/s], R is the radius of gyration of a stirring blade [m], and g is the acceleration of gravity [m/s].

Process for producing a granular anionic surfactant

A process for producing an emulsion, including adding a mixture () comprising a water-soluble inorganic salt (a) and/or an aqueous solution containing (a) to a mixture () containing a surfactant (b), a surfactant-emulsifying agent (c) for emulsifying the surfactant (b), and a hydrophilic powder (d), and mixing mixtures () and () to emulsify the surfactant (b), wherein water-soluble inorganic salt (a) may be a carbonate, surfactant (b) may be an anionic surfactant and/or a nonionic surfactant, surfactant-emulsifying agent (c) may be a water-soluble polymer, and hydrophilic powder (d) may be an inorganic chelating agent.

Process for producing an emulsion

The invention provides a process for producing a granular anionic surfactant, including the steps of carrying out drying and granulation simultaneously while adding an anionic surfactant paste to a powder raw material under reduced pressure in a granulator provided with a stirring blade and a cracking blade to obtain granules.

Process for producing granular anionic surfactant

An anionic surfactant powder prepared by subjecting a mixture of an anionic surfactant and a solvent to microwave irradiation to remove at least a part of the solvent, and a process for preparing the anionic surfactant. The anionic surfactant powder can be suitably used for laundry detergents, detergents for tableware and kitchenware, foaming agents for toothpastes, powdery shampoos, emulsifying agents for polymerization, foaming agents for cement plaster and the like.

Process for removing solvent from anionic surfactant, and anionic surfactant powder produced thereby

A method for producing a monoalkanol amide comprising the steps of (a) treating an entire amount of fatty acid with a monoalkanol amine in an amount of 0.7 to 0.95 times by mole of the amount of the fatty acid and more than 70% and not more than 90% by weight of the entire amount of the monoalkanol amine to yield a mixture mainly containing a monoalkanol amide and an amido monoester; and (b) treating the mixture obtained in step (a) with the remaining portion of the monoalkanol amine, wherein the molar ratio of the entire amount of the monoalkanol amine to that of the fatty acid is 1.0 to 1.3.

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Wakayama, Japan

Kazuhito Miyoshi