Kyowa Chemical Industry Co., Ltd.

Tsutomu Nosu

Shigeo Miyata

Yoshiharu Sawa

Wataru Hiraishi

Harumi Takabatake

Yoshiyuki Nagae

Makoto Yoshii

Keiko Katsuki

Tomoko Tachifuji

A process for purifying a crude polyether, comprising contacting a crude polyether obtained by addition polymerizing an active hydrogen-containing compound with an alkylene oxide compound in the presence of an alkali metal-containing basic catalyst to an adsorbent comprising a synthesized hydrous magnesium silicate compound which satisfies the following requirements (1) to (5) in order to reduce the alkali metal content of the crude polyether: (1) it is represented by the following formula I:(CaO).(MgO).(AlO).SiO.mHOIwherein x, y, z and m satisfy the following ranges:x&#x3c;y, z&#x3c;y, 0&#x2266;x&#x2266;0.1, 0.6&#x2266;y&#x2266;0.6, 0&#x2266;z&#x2266;0.1 and 0.1&#x2266;m&#x2266;1.5, (2) it is amorphous according to the analysis of its powder method X-ray diffraction diagram, (3) it has a BET specific surface area of 100 to 400 m/g, (4) it has an alkali metal content of 0.1 wt % or less, and (5) it has an average particle diameter of 2 to 60 &#x3bc;m. According to the present invention, a purified polyether having an extremely low content of an alkali metal can be obtained effectively.

Process for purification of crude polyether and adsorbent

A polyketone resin composition, which has flame retardancy and is suitable for a variety of molded articles is provided. A flame-retardant resin composition obtained by incorporating 15 to 60% by weight of surface-coated magnesium hydroxide having a specific surface area measured by a BET method of 1 to 15 m /g and an average secondary particle diameter of 0.2 to 5 &mgr;m into a polyketone resin; and molded article thereof.

Flame-retardant polyketone resin composition and molded article

Synthetic resin composition having resistance to thermal deterioration and molded articles

Polyolefin resin composition and zinc-containing hydrotalcite particles

An acid-resistant, thermoplastic resin composition which is nonpoisonous and non-halogen and has an acid-resistance for a long period of time, the acid-resistant, thermoplastic resin composition containing a thermoplastic resin, 30 to 70% by weight of magnesium hydroxide which has a specific surface area of 20 m,/g or less and an average secondary particle diameter of 0.2 to 5.0 &mgr;m and is surface-treated with at least one surface-treating agent selected from a water-soluble silane-coupling agent, a phosphoric acid ester, a higher fatty acid or its alkali metal salt, and 1 to 20% by weight of a reaction type compatibilizing agent.

Acid resistant, thermoplastic resin composition containing magnesium hydroxide and its use

Disclosed are ultraviolet light protective agents having the general formula:

Ultraviolet protective agent

A resin composition containing a hydrotalcite compound in an amount of 0.01 to 5 parts by weight based on 100 parts by weight of the thermoplastic resin, the hydrotalcite compound having fine crystals of copper oxide deposited on the surface thereof; and a molded article formed of the above resin composition. The resin composition and the molded article formed thereof have excellent heat resistance and weatherability.

Resin composition and molded article thereof

A crystalline propylene polymer composition having improved resin flowability and processability, having remarkable resistance to color development (pinking) and excellent anti-rust property and heat stability, and comprising 100 parts by weight of a crystalline propylene polymer, 0.01 to 1 part by weight of an aromatic peroxide and 0.001 to 1 part by weight of a hydrotalcite compound of the formula (1),

Crystalline propylene polymer composition

A stabilized halogen-containing resin composition contains 100 parts by weight of a halogenated polymer of an ethylenically unsaturated monomer, 0.01 to 5 parts by weight of at least one member selected from a perchloric acid-containing hydrotalcite compound and perchloric acid salt, and 0.01 to 10 parts by weight of a hydrotalcite compound prepared by removing crystal water therefrom under heat. The stabilized, halogen-containing resin composition is excellent in heat stability and gives molded articles free from deterioration in color tone.

Stabilized, halogen-containing resin composition

A halogen-containing resin composition containing 100 parts by weight of a halogen-containing resin, 0.01 to 10 parts by weight of a hydrotalcite, 0.01 to 10 parts by weight of a perchloric acid ion-containing hydrotalcite, and 0.01 to 5 parts by weight of at least one member selected from a .beta.-diketone compound, an organic acid metal salt and an organic tin compound, the resin composition being thermally stabilized against heat treatment and sun light and being improved in antistatic properties.

Antistatic, thermally stabilized halogen-containing resin composition

A stabilized halogen-containing resin composition wherein

Stabilized halogen-containing resin compositions

A stabilizer composition for use in halogen-containing resins, comprising as an active ingredient a melt mixture containing a product of a hydrotalcite obtained by removing water of crystallization and a lubricant.

Stabilizer composition for use in halogen-containing resins

Magnesium oxide is incorporated into a polyvinyl chloride resin composition comprising a polyvinyl chloride, a hydrotalcite, a .beta.-diketone compound and an organic acid salt of zinc or a polyvinyl chloride resin composition comprising a polyvinyl chloride, a hydrotalcite and an organic tin compound. Bubbling as well as discoloration can be prevented in a molded article prepared from the polyvinyl chloride resin composition. Magnesium oxide having a specific surface area of at least 50 m.sup.2 /g and an average secondary particle size smaller than 5 .mu.m is preferably used.

Stabilized polyvinyl chloride resin composition

An aluminum hydroxide gel of the following formula

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Sakaide, Japan

Tsutomu Nosu