Mizusawa Industrial Chemicals, Ltd.

Mizusawa Kagaku Kogyo Kabushiki Kaisha

Mizusawa International Chemicals, Ltd.

Mizusawa Industrial Chemcals, Ltd.

Masahide Ogawa

Kiyoshi Abe

Teiji Sato

Koichi Usui

Tadahisa Nakazawa

Masanori Tanaka

Kazuhiko Suzuki

Kunio Goto

Masao Takahashi

Toshio Kitsu

Kinichi Ono

Shoji Shoji

Seikichi Takahashi

Kazumitsu Enomoto

Takashi Tokita

Noriyuki Takahashi

Yujiro Sugahara

Yoshinobu Komatsu

Akira Tatebe

Seiji Kojima

Shigehisa Imafuku

Hideaki Kurosaki

Yuuzi Washio

Toshio Ito

Izumi Serizawa

Seiji Okabayashi

Hirofumi Watanabe

Hiroshi Ogawa

Osamu Okumura

Kiyoshi Takai

Hiroo Inoue

Tetsuo Masuko

Yasuo Mizoguchi

Hisashi Tsuchida

Koyoshi Takai

Hideo Sugai

Kazuhiki Suzuki

Jun Suzuki

Yujiro Sugahara, Deceased

Kouichi Yamada

Kouichi Usui

Seizi Wakaki

Maso Takahashi

Choichi Abe

Mitsuo Saito

Disclosed are amorphous silica or silica-alumina spherical particles composed of X-ray diffractometrically substantially amorphous silica or silica-alumina, wherein individual particles have a definite spherical shape and a notched surface, the circularity (A) represented by the following formula: ##EQU1## wherein r1 stands for the radius of the circumcircle of the profile of the particle in an electron microscope photo thereof and r2 stands for the radius of the inscribed circle of the profile of the particle in the electron microscope photo, is in the range of from 0.90 to 1, the notching degree (B) represented by the formula: ##EQU2## wherein .DELTA.t stands for the depth between the peak and trough in the radial direction of notches on the profile of the particle in the electron microscope photo and r1 is as defined above, is in the range of from 1 to 10%, and the primary particle size (2r1) determined by the electron microscope method is in the range of from 0.1 to 20 .mu.m.

Amorphous silica or silica-alumina spherical particles and process for

An lithium aluminum complex hydroxide salt (LAHS) and a process for preparation thereof is provided. The LAHS is represented by the formula;

Lithium aluminum complex hydroxide salt and process for preparation

The amorphous silica has a large apparent specific gravity despite of its BET specific surface area of 200 to 500 m.sup.2 /g, has an oil absorption amount of as small as 50 to 120 ml/100 g, has an agglomeration degree (D1/D0=DA) defined by the ratio of silica elementary particle diameter D0 to primary particle diameter D1 of from 10 to 50, and has nearly a spherical particulate structure which is quite different from that of the conventional gelation method silica (DA=OO). The amorphous silica-type filler exhibits excellent properties in regard to handling, processability, dispersion property and abrasion-resistant property and, when added as, for example, an anti-blocking agent, makes it possible to obtain resin films having transparency and scratch-resistant property without fisheyes or voids. Owing to the above properties, the amorphous silica that is used as a filler for the heat-sensitive recording papers suppresses ground fogging, improves the image concentration, makes it possible to apply a highly viscous coating solution since the filler dispersed in an aqueous solution creates very small viscosity, and imparts excellent abrasion resistance to the apparatus during the step of coating.

Amorphous silica filler

The amorphous silica has a large apparent specific gravity despite of its BET specific surface area of 200 to 500 m.sup.2 /g, has an oil-absorption amount of as small as 50 to 120 ml/100 g, has an agglomeration degree (D1/D0=DA) defined by the ratio of silica elementary particle diameter D0 to primary particle diameter D1 of from 10 to 50, and has nearly a spherical particulate structure which is quite different from that of the conventional gelation method silica (DA=.infin.). The amorphous silica-type filler exhibits excellent properties in regard to handling, processability, dispersion property and abrasion-resistant property and, when added as, for example, an anti-blocking agent, makes it possible to obtain resin films having transparency and scratch-resistant property without fisheyes or voids. Owing to the above properties, the amorphous silica that is used as a filler for the heat-sensitive recording papers suppresses ground fogging, improves the image concentration, makes it possible to apply a highly viscous coating solution since the filler dispersed in an aqueous solution creates very small viscosity, and imparts excellent abrasion resistance to the apparatus during the step of coating.

A stabilizer for resin, which is composed of a lithium aluminum complex hydroxide salt represented by the following formula

Lithium aluminum complex hydroxide salt stabilizer for resins

Disclosed is an alumina-silica resin additive consisting of amorphous alumina-silica particles in which a definite cubic or spherical shape is retained in primary particles and the particle sizes of both the primary particles and the secondary particles are controlled to very small values. This additive is excellent in dispersibility in a resin, non-blowing property, slip characteristic and anti-blocking property. A product obtained by surface-treating the amorphous alumina-silica particles with a certain amount of an organic lubricant is very valuable as a filler.

Alumina-silica resin additive

The amorphous silica has a large apparent specific gravity despite of its BET specific surface area of 20 to 500 m.sup.2 /g, has an oil absorption amount of as small as 50 to 120 ml/100 g, has an agglomeration degree (D1/D0=DA) defined by the ratio of silica elementary particle diameter D0 to primary particle diameter D1 of from 10 to 50, and has nearly a spherical particulate structure which is quite different from that of the conventional gelation method silica (DA=.infin.). The amorphous silica-type filler exhibits excellent properties in regard to handling, processability, dispersion property and abrasion-resistant property and, when added as, for example, an anti-blocking agent, makes it possible to obtain resin films having transparency and scratch-resistant property without fisheyes or voids. Owing to the above properties, the amorphous silica that is used as a filler for the heat-sensitive recording papers suppresses ground fogging, improves the image concentration, makes it possible to apply a highly viscous coating solution since the filler dispersed in an aqueous solution creates very small viscosity, and imparts excellent abrasion resistance to the apparatus during the step of coating.

Amorphous silica-type filler

Disclosed are amorphous silica or silica-alumina spherical particles composed of X-ray diffractometrically substantially amorphous silica or silica-alumina, wherein individual particles have a definite spherical shape and a notched surface, the circularity (A) represented by the following formula: ##EQU1## wherein r1 stands for the radius of the circumcircle of the profile of the particle in an electron microscope photo thereof and r2 stands for the radius of the inscribed circle of the profile of the particle in the electron microscope photo, is in the range of from 0.90 to 1, the notching degree (B) represented by the following formula: ##EQU2## wherein .DELTA.t stands for the depth between the peak and trough in the radial direction of notches on the profile of the particle in the electron microscope photo and r1 is as defined above, is in the range of from 1 to 10%, and the primary particle size (2r1) determined by the electron microscope method is in the range of from 0.1 to 20 .mu.m.

Amorphous silica spherical particles

The invention is a process for preparing amorphous silica alumina spherical particles by mixing sodium silicate or silicic acid gel with sodium aluminate and sodium hydroxide in an aqueous solution to form a gel, homogenizing the formed gel, crystallizing this intermediate product at 85.degree. C. to 200.degree. under atmospheric pressure or under hydrothermal conditions to form spherical zeolite particles with an x-ray diffraction pattern inherent to P-type zeolites and with a notched surface, treating the zeolite particles with acid to remove the sodium, thereby rendering the particles amorphous.

Preparation of amorphous silica-alumina particles by acid-treating

Active analcime having a chemical composition comprising 60 to 95% by weight of SiO.sub.2, 0.3 to 20% by weight of Al.sub.2 O.sub.3 and 0.02 to 11% by weight of Na.sub.2 O based on the three components, an X-ray diffraction pattern inherent to analcime and a moisture adsorption of 5 to 30% by weight as determined under conditions of a relative humidity of 90%, an ambient temperature of 25.degree. C. and a standing time of 24 hours, wherein individual particles have a tetracosahedral or angle-rounded tetracosahedral particulate shape and the primary particle size of 0.1 to 50 .mu.m as determined according to the electron microscope method. This active analcime is obtained by acid-treating a zeolite by using an acid in an amount of 0.1 to 1.2 molar equivalents per mole of the sum of Al.sub.2 O.sub.3 and Na.sub.2 O components in the zeolite so that the crystal structure of analcime is left. Amorphous silica which is obtained by an acid treatment of a zeolite and is X-ray diffractometrically substantially amorphous, wherein individual particles have a tetracosahedral or angle-rounded tetracosahedral particulate shape and the primary particle size is 0.1 to 50 .mu.m as determined according to the electron microscope method. This amorphous silica is obtained by acid-treating a zeolite so that Al.sub.2 O.sub.3 and Na.sub.2 O components are removed in amounts sufficient to render the zeolite amorphous.

Tetracosahedral siliceous particles and process for preparation thereof

Disclosed are amorphous silica-alumina spherical particles having a notched surface. The particles have a small specific surface area and a highly controlled hygroscopic property. The spherical particles are obtained by exchanging at least a part of an alkali metal ion of a P-type zeolite as the starting material with a divalent metal and firing the ion-exchanged zeolite. Since the pH value is shifted to a weakly alkaline level by the ion exchange treatment, the particles are effective as a filler for stabilizing a resin or the like when incorporated therein, and the refractive index of the particles can be made close to that of a resin in which the particles are to be incorporated.

Amorphous silica-alumina spherical particles and process for preparation

Disclosed to a stabilizer composition for a chlorine-containing polymer, which comprises a zeolite type stabilizer; calcium hydroxide or magnesium hydroxide, a metal soap type stabilizer and perchloric acid as indispensable components. The stabilizer composition is obtained by adding a metal soap type stabilizer to a mixture of a zeolite type stabilizer and calcium hydroxide or magnesium hydroxide under attrition to cover the mixture with the metal soap type stabIlizer at a high efficiency, and adding perchloric acid to the covered mixture. In the stabilizer composition of the present invention, the initial discoloration, which is a fatal defect of the conventional zeolite type stabilizer for a chlorine-containing polymer, can be prevented, and a sufficient hydrogen chloride-capturing capacity is exerted and a high heat stability is attained without occurrence of bleeding.

Stabilizer composition for chlorine-containing polymers and process for

Synthetic stevensite composed of stevensite-type sodium magnesium phylosilicate of which metallic components consist essentially of magnesium, sodium and silicon. The synthetic stevensite is characterized by having an X-ray diffraction peak at a spacing of 16 to 26 .ANG. when treated with ethylene glycol. It can be produced by a process comprising hydrothermally treating an aqueous composition containing basic magnesium carbonate and a silica-sodium component selected from the group consisting of (i) sodium silicate, (ii) sodium silicate and amorphous silica, and (iii) amorphous silica and sodium silicate.

Synthetic stevensite and process for preparation thereof

Disclosed is a composite adsorbent consisting of a molded body of a homogeneous mixture comprising powdery active carbon and hydrous alumina of the pseudoboehmite type. This composite adsorbent has high mechanical strength and abrasion resistance. This composite adsorbent is excellent in the capacity of adsorbing organic components such as gasoline, and the desorption of the adsorbed components can be easily accomplished at a high desorption ratio. These excellent capacities are retained even if the adsorption-desorption cycle is repeated. Accordingly, this composite adsorbent is especially valuable as the adsorbent for an automobile canister.

Process for treating air containing hydrocarbon vapor with a composite

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Shibata, Japan

Masahide Ogawa