Kao Corporation

Akimitsu Sakai

Toshiya Hagihara

Yuichiro Kobayashi

Hiroki Sawada

Yukinaga Yokota

Kozo Kitazawa

Hiroshi Nagumo

Toshihiro Tanaka

Hideo Suzuki

Hiroyasu Togashi

Atsushi Tamura

Shogo Nomoto

Shoji Nakagawa

Koji Taira

Shougo Nomoto

To provide a detergent composition which has little corrosion to a wiring material and is excellent in cleaning ability of a semiconductor substrate or semiconductor device on which the fine particles and the metal impurities are deposited. A detergent composition comprising a reducing agent, wherein the detergent composition has an oxidation-reduction potential at 25&#xb0; C. of +0.2 V or less, and a pH at 25&#xb0; C. of from 3 to 12; and a cleaning process of a semiconductor substrate or a semiconductor device using the detergent composition.

Semiconductor cleaner comprising a reducing agent, dispersant, and phosphonic acid-based chelant

A resist developer obtained by a process comprising mixing (1) at least one compound selected from the group consisting of a basic compound A and an organic compound B having phenolic hydroxyl group and carboxyl group in a molecule, and/or (2) a salt C formed between the basic compound A and the organic compound B. The resist developer exhibiting excellent dissolution selectivity, and developing a resist in a short period of time, can be used for developing positive and negative resists.

Resist developer

A resist developer comprising (1) a basic organic compound A and (2) a salt C of (a) a basic compound A&prime; and (b) an organic compound B capable of forming a salt together with said basic compound A&prime;, wherein said basic compound A&prime; is the same or different from said basic organic compound A, and wherein said resist developer is prepared by combining (1) and (2), or by reacting an excess amount of said basic organic compound A with said organic compound B.

An ester compound having thermal stability in the presence of a metal characterized in that the ester compound is formed between a dihydric to nonahydric hindered alcohol having 5-15 carbon atoms and a saturated aliphatic monocarboxylic acid having 3-20 carbon atoms or a derivative thereof; that the ratio of a branched carboxylic acid or a derivative thereof to the entire carboxylic acids or derivatives thereof is not less than 50 mol %; that the hydroxyl value of the ester compound is not more than 30 mg KOH/g; and that the acid value after a sealed tube test is not more than 10 mg KOH/g; and a lubricating oil composition comprising the ester compound in an amount of not less than 50% by weight. The present invention provides an ester compound having outstandingly good thermal stability in the presence of a metal and a lubricating oil composition and a working fluid composition for a refrigerating machine comprising the ester compound as the main component.

Method for using thermally stable esters in a lubricating oil for a refrigerating machine

Synthetic lubricating oil

A working fluid composition for use in a refrigeration system which comprises a refrigerating oil comprising a compound having one or more ketone groups in the molecular structure as a base oil and a hydrofluorocarbon.

Working fluid composition having ketone-containing compound for use in

The present invention is directed to a working fluid composition for a refrigerating machine which contains difluoromethane and a refrigeration oil. An ester formed between (a) an aliphatic polyhydric alcohol having a carbon number of 2 to 12; and (b) a saturated aliphatic monocarboxylic acid having a carbon number of 4 to 9 or a derivative thereof, the ratio of the number of acyl groups having a branched chain or branched chains to the number of the entire acyl groups in the ester being not less than 95%, is used as a base oil of the refrigeration oil. The working fluid composition for refrigerating machine of the present invention is excellent not only in compatibility, lubricity, and electric insulating property but also in thermal stability as compared to the conventional products.

Ester-containing working fluid composition for refrigerating machine

The present invention is directed to a working fluid composition for refrigerating machine comprising: (i) a hydrofluorocarbon, (ii) a compound having an epoxycyclohexyl group and/or a compound having an epoxycyclopentyl group, and (iii) an ester formed between a neopentylpolyol and a saturated branched aliphatic monocarboxylic acid having a carbon number of 7 to 9. The working fluid composition of the present invention is excellent in compatibility, lubricity, thermal stability and insulating property.

Working fluid composition for refrigerating machine

The refrigeration oil composition comprises (1) a hydrogenated fluoroethane and (2) an ester compound obtained from (2-a) an aliphatic polyhydric alcohol having 1 to 6 primary hydroxyl groups, (2-b) a saturated aliphatic monocarboxylic acid having 2 to 9 carbon atoms, straight or branched, or a derivative thereof and (2-c) a saturated aliphatic dicarboxylic acid having 2 to 10 carbon atoms, straight or branched, or a derivative thereof, said ester compound having a kinematic viscosity at 100 degree C. of 1 to 100 cst.

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Wakayama, Japan

Akimitsu Sakai