Abstract: A fire-retarding resin composition composed of(a) a thermoplastic resin,(b) about 20 to about 60% by weight, based on the total weight of (a), (b) and (c), of a magnesium hydroxide powder whose surface is treated with an alkali metal oleate, and(c) about 0.1 to about 10% by weight, based on the total weight of (a), (b) and (c), of at least one fatty acid metal salt selected from the group consisting of magnesium oleate and aluminum oleate; and a fire retardant composition for thermoplastic resins, said composition comprising(b) a magnesium hydroxide powder whose surface is treated with an alkali metal oleate, and(c) at least one fatty acid metal salt selected from the group consisting of magnesium oleate and aluminum oleate, the weight ratio of (b) to (c) being from 2 to 600:1.

Abstract: A polyolefin composition consisting essentially of(a) 100 parts by weight of a polyolefin containing halogens derived from a polymerization catalyst and/or attributed to the after-halogenation of the polymer, and(b) about 0.001 to about 10 parts by weight of an aluminum-magnesium hydroxide represented by the following formulaMg.sub.1-x Al.sub.x (OH).sub.2+x.mH.sub.2 O (1)wherein x is a positive number represented by 0<x.ltoreq.0.5 and m is a positive number represented by 0.ltoreq.m<2, andhaving a BET specific surface area of no more than about 40 m.sup.2 /g; and a method for inactivating the halogen in a halogen-containing polyolefin.

Abstract: Fibrous hydrotalcites having a hexagonal needle-like crystal structure. The fibrous hydrotalcites are produced by contacting a basic magnesium compound having a needle-like crystal structure and expressed by the following formula (2)Mg(OH).sub.2-n'x.sbsb.2 A.sub.x.sbsb.2.sup.n'.spsp.-.m.sub.2 H.sub.2 O (2)wherein A.sup.n'.spsp.- represents a monovalent or divalent anion, n' is 1 or 2, and x.sub.2 and m.sub.2 are numbers satisfying the following conditions,0.2.ltoreq.x.sub.2 .ltoreq.0.5,O.ltoreq.m.sub.2 .ltoreq.2,with a compound capable of providing a trivalent metal cation and being soluble in a liquid reaction medium which is chemically inert and is a non-solvent for the basic magnesium compound, the contacting being carried out in said liquid reaction medium under conditions which do not cause a loss of the needle-like crystal form of the basic magnesium compound, while maintaining the ratio of M.sup.3+ to the sum of Mg and M.sup.3+ at O<M.sup.3+ /(Mg+M.sup.3+).ltoreq.0.

Abstract: In a method for inhibiting the corrosion-causing tendency and coloration of an olefin polymer or copolymer containing a halogen component by incorporating about 0.01 to about 5 parts by weight of a hydrotalcite; the improvement which comprises mixing an olefin polymer or copolymer containing a halogen component attributed to a polymerization catalyst and/or to post-halogenation, with a hydrotalcite of the formulaMg.sub.1-x Al.sub.x (OH).sub.2 A.sup.n-.sub.x/n.mH.sub.2 Owherein 0<x.ltoreq.0.5, m is a positive number, and A.sup.n- represents an anion having a valence of n,or a product resulting from the surface-coating of said hydrotalcite with an anionic surface-active agent, said hydrotalcite having (i) a BET specific surface area of not more than 30 m.sup.2 /g, preferably not more than 20 m.sup.2 /g, (ii) an average secondary particle size of not more than 5 microns, preferably not more than 1.

Abstract: A detergent-dispersant composition for lubricating or fuel oils, said composition consisting essentially of(a) an amount effective as a detergent-dispersant of a hydrotalcite having a specific surface area, determined by the BET method, of up to about 60 m.sup.2 /g and an average secondary particle size of up to about 5 microns, the hydrotalcite particles being untreated or surface-treated with an anionic surface-active agent, and the hydrotalcite being represented by the following formulaMg.sub.x Al.sub.2 (OH).sub.6+2x-2y (CO.sub.3).sub.y.mH.sub.2 Owherein x is a positive number represented by3<x<20, y is a positive number represented by0<y<2, and m is a positive number of up to 7, and(b) a hydrophobic dispersant or diluent.

Abstract: A method for inhibiting the thermal or ultraviolet degradation of a thermoplastic resin containing halogen and/or acidic components excepting olefinic resins, which comprises mixing said thermoplastic resin with about 0.01 to about 5 parts by weight, per 100 parts by weight of said resin, of a hydrotalcite of the following formulaMg.sub.1-x Al.sub.x (OH).sub.2 A.sub.x/n.sup.n- .multidot.mH.sub.2 Owherein O<x.ltoreq.0.5, m is a positive number, and A.sup.n- represents an anion having a valence of n, or a product resulting from surface-treatment of said hydrotalcite with an anionic surface-active agent, said hydrotalcite having a BET specific surface area of not more than 30 m.sup.2 /g; and a thermoplastic resin composition prepared by aforesaid method.

Abstract: A dental cleaning composition comprising about 0.01 to about 30% by weight, based on the composition, of a hydrotalcite compound of the following formulaMg.sub.1-x Al.sub.x (OH).sub.2+x-ny A.sub.y.sup.n-.mH.sub.2 OwhereinA.sup.n- represents an anion having a valence ofn, x is a positive number represented by 0<x<0.5,y is a positive number represented by 0<y.ltoreq.0.5, andm is a positive number represented by 0<m<2,and a dentally acceptable carrier or diluent; and a method for dental cleaning with the use of the above composition.

Abstract: In a method for inhibiting the corrosion-causing tendency and coloration of an olefin polymer or copolymer containing a halogen component by incorporating about 0.01 to about 5 parts by weight of a hydrotalcite; the improvement which comprises mixing an olefin polymer or copolymer containing a halogen component attributed to a polymerization catalyst and/or to post-halogenation, with a hydrotalcite of the formulaMg.sub.1-x Al.sub.x (OH).sub.2 A.sub.x/n.sup.n-.mH.sub.2 Owherein0<x.ltoreq.0.5, m is a positive number, andA.sup.n- represents an anion having a valence of n, or a product resulting from the surface-coating of said hydrotalcite with an anionic surface-active agent, said hydrotalcite having (i) a BET specific surface area of not more than 30 m.sup.2 /g, preferably not more than 20 m.sup.2 /g, (ii) an average secondary particle size of not more than 5 microns, preferably not more than 1.

Abstract: Fibrous magnesium hydroxide having a hexagonal needle-like crystal structure. The fibrous magnesium hydroxide can be produced by drying a basic magnesium compound having a needle like crystal structure expressed by the following formulaMg(OH).sub.2-nx.A.sub.x.sup.n-.mH.sub.2 Owherein n is 1 or 2, A.sup.n- represents a monovalent or divalent anion, x is 0.2.ltoreq.x.ltoreq.0.5, and m is O<m.ltoreq.2,under conditions which do not cause a loss of its needle-like crystal form so that a part of the water of crystallization is liberated from the magnesium compound; and contacting the dried magnesium compound with an alkali in a liquid medium which is inert to the magnesium compound and does not dissolve the magnesium compound.

Abstract: A fire-retardant thermoplastic resin composition consisting essentially of:(A) a thermoplastic synthetic resin,(B) about 40 to 150 parts by weight, preferably about 70 to 120 parts by weight, per 100 parts by weight of the thermoplastic synthetic resin, of at least one magnesium-containing inorganic compound selected from the group consisting of magnesium hydroxide, basic magnesium carbonate hydrate and hydrotalicites, and(C) a fire-retardant assistant selected from the group consisting of (1) about 0.1 to 30 parts by weight, per 100 parts by weight of the magnesium-containing inorganic compound, of an alkali metal chloride, (2) about 0.2 to 5% by weight, calculated as metal per 100 parts by weight of the magnesium-containing inorganic compound, of an inorganic tin compound, and (3) a combination of the alkali metal chloride (1) with about 0.

Abstract: A novel magnesium hydroxide of the formula Mg(OH).sub.2 having (i) a strain in the direction of not more than 3.0 .times. 10.sup.-3, (ii) a crystallite size in the direction of more than 800 A, and (iii) a specific surface area of less than 20 m.sup.2 /g. The magnesium hydroxide, if desired as coated with anionic surfactants, is useful, for example, as fire retardants for thermoplastic synthetic resins and aqueous paints. The novel magnesium hydroxide is prepared by heating in an aqueous medium at an elevated pressure a novel basic magnesium chloride or nitrate of this invention expressed by the formula Mg(OH).sub.2-x A.sub.x .sup.. mH.sub.2 O wherein A is Cl or NO.sub.3, x is a number of more than 0 but less than 0.2, and m is a number of 0 to 6.

Abstract: A novel magnesium hydroxide of the formula Mg(OH).sub.2 having (i) a strain in the (101) direction of not more than 3.0 .times. 10.sup.-3, (ii) a crystallite size in the (101) direction of more than 800 A, and (iii) a specific surface area of less than 20 m.sup.2 /g. The magnesium hydroxide, if desired as coated with anionic surfactants, is useful, for example, as fire retardants for thermoplastic synthetic resins and aqueous paints. The novel magnesium hydroxide is prepared by heating in an aqueous medium at an elevated pressure a novel basic magnesium chloride or nitrate of this invention expressed by the formula Mg(OH).sub.2-x A.sub.x.mH.sub.2 O wherein A is Cl or NO.sub.3, x is a number of more than 0 but less than 0.2, and m is a number of 0 to 6.

Abstract: A fire-retarding thermoplastic resin composition comprising (A) a thermoplastic resin, and (B) a fire-retarding amount of a hydrotalcite having a specific surface area, determined by the BET method, of not more than 30 m.sup.2 /g, the hydrotalcite being uncoated, or coated with an aqueous solution of an anionic surface active agent in a concentration of not more than 20 millimoles/liter in a thickness larger than a monolayer but up to a triple layer.

Abstract: A compound having a composition of the following formula:Mg.sub.x Al.sub.v (OH).sub.2x.sub.+3y.sub.-z (A).sub.z. aROHwherein A is a member selected from the group consisting ofA. a mono- or bivalent anion of a central nervous system medicament having a functional group selected from the class consisting of carboxyl, hydroxy and sulfonic groups, andB. a combination of said mono- or bivalent anions of a central nervous system medicament and not more than 50 mol %, based on the total anions, of an ion selected from the group consisting of halogen, nitrate, carbonate and sulfate ions,R is a member of the group consisting of hydrogen and ethyl, and x, y, z and a are each a positive number satisfying the following relationships:1/4 .ltoreq. x/y .ltoreq. 8AndAnd a process for the preparation of said compounds.