Agency of Industrial Science and Technology

Ministry of International Trade & Industry

Director-general of the Agency of Industrial Science and Technology

Kashima Oil Co., Ltd.

Shoei Fujishige

Yukimichi Nakao

Mitsuo Suzuki

Toshimi Shimizu

Akira Okada

Aizo Yamauchi

Shoji Ito

Okihiko Hirasa

Hideyuki Aragane

Rikio Numajiri

N-(2-methoxyethyl)-N-isopropylacrylamide is a novel compound. The polymer obtained by polymerizing this novel compound is a novel hydrophilic-hydrophobic thermally reversible type macromolecular compound having a transition temperature in the range of 12.degree. C. to 14.degree. C.

N-(2-methoxyethyl)-N-isopropylacrylamide, hydrophilic-hydrophobic

The invention provides an aqueous thickener composition useful in the pros of enhanced oil recovery in petroleum technology. The thickener composition is prepared by the reaction of a xanthan gum or a similar high molecular weight polysaccharide with a low molecular weight aliphatic aldehyde such as formaldehyde in an aqueous medium in the presence of an inorganic salt such as sodium chloride in a concentration of 0.5 to 10% by weight so that an intramolecular crosslinked fine structure of superhelix is formed in the polysaccharide molecules and the aqueous solution of thus chemically modified polysaccharide is imparted with remarkably improved thermal stability as compared to the aqueous solutions of a similar polysaccharide which has been treated under the same conditions but in the absence of any inorganic salt in the reaction medium.

Thickner composition and a method for the preparation thereof

Nickel boride colloid useful as a catalyst for the hydrogenation of carbonyl compound is obtained by causing a nickel salt to react upon an alkali metal borohydride in an alcohol substantially free from dissolved oxygen under a non-oxidative atmosphere in the presence of an alcohol-soluble polymer.

Method for manufacture of nickel boride colloid

Particles of active substance each comprising a core of a high molecular substance containing an aldehyde group and a coat applied to the aforementioned core and formed of the reaction product of the aforementioned aldehyde group-containing high molecular substance with a high molecular substance containing active hydrogen, which particles are manufactured by causing particles of the aforementioned aldehyde group-containing high molecular substance to assume a swelled state and allowing the swelled particles to be reacted upon by the aqueous solution of the aforementioned active hydrogen-containing high molecular substance.

Particles of activated oxidized polysaccharide substance coated with

In an organic compound having a methlene group attached to a tertiary carbon atom thereof, preferential hydrogenation of the methylene group of the compound is effected by bringing hydrogen into contact with the compound in the presence of a nickel boride colloid.

Method for preferential hydrogenation of terminal methylene group in

Syndiotactic poly(methyl methacrylate) obtained by radical polymerization mixed with isotactic poly(methyl methacrylate) obtained by anionic polymerization so that the ratio by weight of the syndiotactic component to the isotactic component is from 2:8 to 8:2 and the mixture is dissolved homogeneously in a non-polar solvent such as benzene or toluene. The resist composition thus obtained is applied onto a substrate to form a photosensitive element which is then exposed to electron rays to cause depolymerization of the polymer in the exposed areas and developed with an organic solvent to form an image which is excellent in contrast and resolving power and devoid of pinholes.

Method for forming images by irradiation of electron rays and resist

Disclosed is a method whereby a vinyl compound such as an .alpha., .beta.-carbonyl compound, acrylonitrile or methacrylonitrile is polymerized in a non-protonic organic medium in the presence of an alkali metal alcoholate as the polymerization catalyst. High polymers having different stereospecific structures contained at a desired ratio as well as low polymers having regulated stereochemical structures are manufactured from vinyl compounds such as above mentioned by selecting reaction conditions such as the kind of organic medium to be used and the amount of the catalyst in use based on that of the charged vinyl compound.

Growing community of inventors

Yokohama, Japan

Shoei Fujishige