Nippon Shokubai Co., Ltd.

Yohei Murakami

Akira Hattori

Toshiaki Matsunaga

Kenji Kadonaga

Masatoshi Yoshida

Yoshihiko Masuda

Yasutaka Nakatani

Hideaki Nagano

Shigeru Tanimori

Kouichi Okamoto

Coating for water blocking agents

Protolytically leaving group-containing copolymer and process for its production

The present invention has its object to provide a friction reducing coating for engineering works, and, a soil adhesion-preventing sheet pile or steel tubular pipe wherein the above-mentioned friction reducing coating for engineering works applied thereto in advance, and, a soil adhesion-preventing construction method which comprises using the above-mentioned friction reducing coating for engineering works and/or the above-mentioned soil adhesion-preventing sheet pile or steel tubular pipe and further provide a negative friction cut construction method for foundation structures which comprises using the above friction reducing coating for engineering works and thus can cut the friction between a foundation structure after laying underground and the surrounding ground and reduce the influences of changes in the surrounding ground on the foundation structure as well as a caisson or pipe jacking construction method which comprises using the above friction reducing coating for engineering works and can reduce the friction between the substrate and soil while minimizing the influences on the surrounding ground and thus can markedly improve the speed and efficiency of construction work. A friction reducing coating for engineering works comprising a water-absorbing resin (a), a hydrophilic binder resin (b) and a solvent (c) as essential components, wherein said hydrophilic binder resin (b) has an acid value of 40 mg KOH/g to 500 mg KOH/g.

Friction reducing coating for engineering works, and sheet pile, steel tubular pipe and construction method

To prevent adhesion of a support body and a hardened body of a hydraulic composition, the hydraulic composition being used for a soil structure such as a retaining wall built in a soil excavating work in the civil engineering and construction fields, a composition (A) composed of at least an alkaline-water-soluble resin with an acid value of not less than 15 mgKOH/g and a water-absorbent material is provided so as to intervene between the support body and the hardened body of the hydraulic composition, either by applying the composition (A) on a surface of the support body, or by covering the support body with a sheet-like member on which the composition (A) is applied. The alkaline-water-soluble resin dissolves in alkaline water upon contact with the same contained in the hydraulic composition. As the alkaline-water-soluble resin dissolves, the water-absorbent material swells absorbing the alkaline water, whereby a layer of the water-absorbent material which has swollen is formed between the hardened body of the hydraulic composition and the support body, preventing the adhesion therebetween.

Adhesion preventing method and support body extracting method

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Suita, Japan

Yohei Murakami