Abstract: Zinc-containing hydrotalcite particles which satisfy the following requirements (1) to (4): (1) the chemical composition should be represented by the following formula (A): ZnxAl2(OH)4+2xCO3.mH2O  (A) wherein x and m satisfy 3.5≦x≦4.5 and 0≦m≦4, respectively, (2) the average secondary particle size should be 2 &mgr;m or less, preferably 0.3 to 1.5 &mgr;m, (3) the amount of particles having a particle size of 10 &mgr;m or more out of all the particles should be 1 wt % or less, preferably 0.5 wt % or less, and (4) the specific surface area measured by a BET method should be 20 m2/g or less, preferably 4 to 15 m2/g; and a resin composition comprising 0.001 to 5 parts by weight of the zinc-containing hydrotalcite particles based on 100 parts by weight of the polyolefin resin. This resin composition has excellent heat deterioration resistance, rust formation preventing properties, coloration preventing properties, dispersibility and filter permeability.

Abstract: 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 m2/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.

Abstract: A flame retardant resin composition comprising (A) 100 parts by weight of a synthetic resin, (B) 20 to 150 parts by weight of magnesium hydroxide particles and (C) 20 to 150 parts by weight of aluminum hydroxide particles, wherein the magnesium hydroxide particles and the aluminum hydroxide particles satisfy the following conditions (i) to (v): (i) the average secondary particle diameter measured by a microtrack method is 0.4 to 4 .mu.m; (ii) the specific surface measured by a BET method is 1 to 15 m.sup.2 /g; (iii) the total content of an iron compound and a manganese compound is 200 ppm or less in terms of metals (Fe+Mn); (iv) the ratio of the specific surface measured by the BET method to the specific surface measured by a Blaine method is 1 to 4; and (v) the content of a water-soluble sodium salt is 500 ppm or less in terms of metal sodium.

Abstract: A flame-retardant resin composition, which comprises 100 parts by weight of a synthetic resin having 70 to 100% by weight of metallocene LLDPE, 20 to 100 parts by weight of a magnesium hydroxide having a BET specific surface area of 20 m.sup.2 /g or less, an average secondary particle diameter of 5 .mu.m or less, measured according to a laser diffraction scattering method, and a water-soluble sodium salt content of 500 ppm or less as a sodium, 1 to 20 parts by weight of red phosphorus having an average secondary particle diameter of 30 .mu.m or less and 0.1 to 20 parts by weight of a carbon powder, the total of the magnesium hydroxide, the red phosphorus and the carbon powder being 120 parts by weight or less.

Abstract: Provided by the present invention are a flame-retardant thermoplastic resin composition which consists of (a) 100 parts by weight of a thermoplastic resin, (b) 5 to 60 parts by weight of a halogen-containing flame retardant, (c) 3 to 20 parts by weight of a flame-retardant aid, (d) 0.5 to 10 parts by weight of silicone and (e) 5 to 30 parts by weight of magnesium hydroxide particles, and which undergoes extinction without dripping so that highly reliable flame retardancy can be obtained, shows excellent mold releasability, and gives a molded article which hardly suffers deterioration in physical properties; and a molded article molded from the composition.

Abstract: A flame retardant having heat deterioration resistance which is composed of magnesium hydroxide particles having (i) an average secondary particle diameter, measured by a laser diffraction scattering method, of not more than 2 .mu.m, (ii) a specific surface area, measured by a BET method, of not more than 20 m.sup.2 /g and containing (iii) a total amount of an iron compound and a manganese compound of not more than 0.02% by weight in terms of metals, and a synthetic resin composition comprising the same and a molded article therefrom.

Abstract: This invention relates to synthetic chalcoalumite-type compounds represented by formula (1) below:M.sup.2+.sub.a-x/2 Li.sub.x.sup.1+ Al.sub.4.sup.3+ (OH).sub.b (A.sup.n-).sub.c.mH.sub.2 O (1)(whereinM.sup.2+ represents at least one of the following divalent metal ions: Zn.sup.2+, Cu.sup.2+, Ni.sup.2+ and Mg.sup.2+,a is 0.6<a<1.2,x is 0<x<1.4,b is 11<b<13,A.sup.n- is at least one member of the group consisting of SO.sub.4.sup.2-, HPO.sub.4.sup.2-, CO.sub.3.sup.2-, SiO.sub.3.sup.2-, SO.sub.3.sup.2-, HPO.sub.3.sup.2-, H.sub.2 PO.sub.4.sup.-, NO.sub.3.sup.- and OH.sup.-,c is 0.5<c<1.2, andm represents a number of 1 to 4)and processes for their preparation. The synthetic chalcoalumite-type compounds of the present invention are conveniently used for adsorbing agents of acidic substances, anion exchangers, infrared absorption agents for agricultural films, deodorants and recording media for ink jet, etc.

Abstract: A halogen-free flame-retardant polyolefin resin composition which can give a molded article improved in low-temperature resistance and surface whitening resistance and improved in flame retardancy and melt index, and an expansion-molded article having uniform and fine gas bubbles without large-sized gas bubbles, the halogen-free flame-retardant polyolefin-based resin composition containing a polyolefin resin, a dihydric or trihydric metal hydroxide surface-treated with a saturated fatty acid, or, when the metal hydroxide is aluminum hydroxide, aluminum hydroxide surface-treated with a saturated or specific unsaturated fatty acid or an alkali metal salt thereof, and an aluminum salt of an unsaturated fatty acid having 10 to 30 carbon atoms.

Abstract: A synthetic chalcoalumite compound represented by the formula (1)(Zn.sub.a-x.sup.2+ M.sub.x.sup.2+)Al.sub.4.sup.3+ (OH).sub.b (A.sup.n-).sub.c.mH.sub.2 O (1)whereinM.sup.2+ represents at least one of Cu, Ni, Co and Mg;a represents 0.3<a<2.0;x represents 0.ltoreq.x<1.0;b represents 10<b<14;A.sup.n- represents one or two selected from SO.sub.4.sup.2-, HPO.sub.4.sup.2-, CO.sub.3.sup.2-, CrO.sub.4.sup.2-, SiO.sub.3.sup.2-, NO.sub.3.sup.2-, OH.sup.- and Cl.sup.- ;c represents 0.4<c<2.0 andm represents a number of 1 to 4,and a process for the production thereof.

Abstract: A halogen-free flame-retardant polyolefin resin composition which can give a molded article improved in low-temperature resistance and surface whitening resistance and improved in flame retardancy and melt index, and an expansion-molded article having uniform and fine gas bubbles without large-sized gas bubbles, the halogen-free flame-retardant polyolefin-based resin composition containing a polyolefin resin, a dihydric or trihydric metal hydroxide surface-treated with a saturated fatty acid, or, when the metal hydroxide is aluminum hydroxide, aluminum hydroxide surface-treated with a saturated or specific unsaturated fatty acid or an alkali metal salt thereof, and an aluminum salt of an unsaturated fatty acid having 10 to 30 carbon atoms.

Abstract: Disclosed are ultraviolet light protective agents having the general formula:(Zn.sub.y M.sup.2+.sub.z).sub.1-x M.sup.3+.sub.x O.sub.1+x/2wherein M.sup.2+ is at least one metal selected from the group consisting of Mg, Ca, Ni and Cu; and M.sup.3+ is at least one metal selected from the group consisting of Al and Fe; as well as a sterilizer and a deodorizer which contain the compound of the above formula (I) as an effective component. They are additives to plastics, rubber, cosmetic materials, and paint and also useful as sterilizer or deodorizer, composition components.

Abstract: 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.

Abstract: 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),(Mg.sub.y Zn.sub.z).sub.1-x Al.sub.x (OH).sub.2 (A).sup.n-.sub.x/2 .multidot.mH.sub.2 O (1)wherein (A).sup.n- is an anion having a valence of n, x, y and z are numbers satisfying y+z=1, 0.ltoreq.y.ltoreq.0.9, 0.1.ltoreq.z.ltoreq.1 and 0.2.ltoreq.x.ltoreq.0.8, and m is 0 or a positive number.

Abstract: A flame retardant aid which serves to provide synthetic resins with sufficient flame retardancy when used together with a decreased amount of aluminum or magnesium hydroxide, and serves to give resin compositions which have color stability against heat and can be almost freely colored. The flame retardant aid is at least one compound selected from the group consisting of:a composite metal compound of the formula (A),Mg.sub.1-(x+y) Ni.sub.x Co.sub.y (OH).sub.2 (A)ora composite metal compound of the formula (B),Mg.sub.1-(x+y) Ni.sub.x Co.sub.y O (B)wherein x and y are defined in the specification,nickel halides,ammonium-containing salts of nickel,inorganic acid salts of nickel, andfatty acid salts of nickel.

Abstract: 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.

Abstract: A flame retardant capable of imparting a polyamide-containing resin with excellent flame retardancy without deteriorating the impact strength of the polyamide-containing resin even when it is incorporated in a small amount, and a flame-retardant polyamide-containing resin composition containing the above flame retardant and having practically sufficient impact strength. The flame retardant comprises 100 parts by weight of magnesium hydroxide, 2 to 750 parts by weight of red phosphorus and 0.2 to 250 parts by weight of an epoxy resin, and the flame-retardant polyamide-containing resin composition comprises 100 parts by weight of a polyamide-containing resin, 2 to 50 parts by weight of magnesium hydroxide, 1 to 15 parts by weight of red phosphorus and 0.1 to 5 parts by weight of an epoxy resin.

Abstract: 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.

Abstract: A stabilized halogen-containing resin composition wherein(a) 0.01 to 10 weight parts of da hydrotalcite,(b) 0.01 to 5 weight parts of a zinc compound,(c) 0.01 to 5 weight parts of magnesium hydroxide, and(d) 0.01 to 5 weight parts of a .beta.-diketone compound and/or a phosphite compoundare compound into a halogen-containing resin per 100 weight parts thereof and a molding article therefrom.

Abstract: 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.

Abstract: A fire retardant comprising 100 parts by weight of a metal hydroxide and 0.1 to 50 parts by weight of an acrylic fiber, and a fire-retardant resin composition comprising 20 to 80% by weight of a synthetic resin or rubber, 80 to 20% by weight of a metal hydroxide and 0.1 to 10 parts by weight, based on 100 parts by weight of the synthetic resin or rubber and the metal hydroxide in total, or an acrylic fiber. The present composition has improved fire retardancy free from degradation in mechanical strength and deterioration of water resistance, and the present fire retardant permits free coloring and releases no toxic smoke.