A process for the manufacturing of fire suppressing crystals having a high Q-factor particle size distribution, said fire suppression crystals being intended for use as a fire suppressing additive in polymer compositions, the process comprising the steps; a) Preparing a mother liquor comprising water and a salt composition obtained in step c) or d), the temperature of said mother liquor being adjusted to 10-50 C. and comprising said salt composition to a level of at least 90% of saturation. Calcium hydroxide is added to the mother liquor to a level of at least 90% of saturation. b) Preparing an acid solution comprising water and two or more acids selected from the group consisting of; C.sub.2-C.sub.6 mono-, di- and/or tri-carboxylic acids, and optionally a phosphorous compound. The temperature of said acid solution is adjusted to 20-90 C. 31 and comprising acids to a level of at least 50% of saturation. c) The mother liquor, comprising calcium hydroxide, obtained from step a) is subjected to intense agitation under which the acid solution obtained from step b) is slowly added to said mother liquor allowing reaction to form salt until supersaturation is achieved while maintaining PH at a level securing that no unreacted acids remains after reaction, d) Crystals formed in the reaction of step c) is continuously or discontinuously removed from the reaction product of step c).

The present invention refers to a polymer composition comprising a polymer and a fire suppressant in form of a mixed salt based on a) at least one mono-, di- and/or tri-carboxylic acid, b) at least one polyphosphoric, pyrophosphoric and/or phosphoric acid, c) a hydroxide or a salt of an alkali or an alkaline earth metal, where a) and c) form a carboxylate and b) and c) form a phosphate and optionally d) a carbonate of an alkali or an alkaline earth metal. The mixed salt have an average particle size in the range of 0.2 to 50 m and a crystalline water content of at least 5% by weight. The mixed salt is present in an amount of 5-70% by weight of the total composition. The polymer composition might further comprise one or more additives.

Provided is a flame-retardant rubber composition including the following components (A) to (D): (A) An olefin-based rubber, (B) An acid-modified polyolefin, (C) A metal hydroxide, and (D)

A cross-1 inking agent for the component (A). A content of the component (C) with respect to 100 parts by weight of a total content of the component (A) and the component (B) falls within a range of from 100 parts by weight to 350 parts by weight. Also provided is an external diaphragm for railroad cars including a cross-linked product of the flame-retardant rubber composition. Thus, there can be provided a flame-retardant rubber composition excellent in rubber physical properties, such as tensile strength and breaking elongation, and durability, and also excellent in flame retardancy, and an external diaphragm for railroad cars obtained using the flame-retardant rubber composition.

Provided is a flame-retardant rubber composition including the following components (A) to (D): (A) An olefin-based rubber, (B) An acid-modified polyolefin, (C) A metal hydroxide, and (D)

A cross-1 inking agent for the component (A). A content of the component (C) with respect to 100 parts by weight of a total content of the component (A) and the component (B) falls within a range of from 100 parts by weight to 350 parts by weight. Also provided is an external diaphragm for railroad cars including a cross-linked product of the flame-retardant rubber composition. Thus, there can be provided a flame-retardant rubber composition excellent in rubber physical properties, such as tensile strength and breaking elongation, and durability, and also excellent in flame retardancy, and an external diaphragm for railroad cars obtained using the flame-retardant rubber composition.

An object of the present invention is to provide a golf ball resin composition having a high resilience, flexibility and high fluidity. The present invention provides a golf ball resin composition having a bending stiffness (M.sub.21-30) ranging from 600 kgf/cm.sup.2 to 5,000 kgf/cm.sup.2 within a bending angle from 21 to 30, a rebound resilience (R) of 50% or more, a slab hardness (Shore D) ranging from 40 to 65, a melt flow rate (190 C., 2.16 kgf) of 1.0 g/10 min or more, and a resilience index value ((M.sub.21-30).sup.0.5(R/100).sup.3) of 8.5 or more.

Polyolefin compositions comprising i) a polyolefin, ii) one or more phosphorus-containing benzofuranone compounds and iii) one or more organophosphorus stabilizers are provided excellent protection against discoloration and enhanced thermal stability during melt processing as exhibited by improved retention of molecular weight and maintenance of polymer molecular architecture.

A halogen-free, fire resistant rubber composition for a fire resistant hose includes: 100 parts by weight of elastomer having a blend of: 60 to 70 parts of ethylene vinylacetate elastomer (EVM), a vinylacetate content of EVM being in the range from 60 to 70% by weight; 40 to 30 parts of terpolymer of ethylene, propylene, and a diene elastomer (EPDM), an ethylene content of EPDM being in the range from 30 to 40% by weight and a propylene content of EPDM being from 60 to 70% by weight; at least one fire retardant ingredient; and at least one vulcanizing agent. The vulcanizing agent is a peroxide curative.

Polyolefin compositions comprising i) a polyolefin, ii) one or more phosphorus-containing benzofuranone compounds and iii) one or more hindered phenolic antioxidants are provided excellent protection against discoloration and enhanced thermal stability during melt processing as exhibited by improved retention of molecular weight and maintenance of polymer molecular architecture.

Polyolefin compositions comprising i) a polyolefin, ii) one or more phosphorus-containing benzofuranone compounds and iii) one or more acid scavengers are provided excellent protection against discoloration and enhanced thermal stability during melt processing as exhibited by improved retention of molecular weight and maintenance of polymer molecular architecture.

Polyolefin compositions comprising i) a polyolefin, ii) one or more phosphorus-containing benzofuranone compounds and iii) one or more hindered amine light stabilizers are provided excellent protection against discoloration and enhanced thermal stability during melt processing as exhibited by improved retention of molecular weight and maintenance of polymer molecular architecture.