The present invention relates to a method for preparing a dialkyi or dialkenyl ether of a cycloaliphatic or araliphatic diol, which comprises (i) reacting the cycloaliphatic or araliphatic diol with metallic sodium in an aprotic organic solvent in the presence of a catalytic amount of at least one monoether-monoalcohol of formula (I) wherein Y is identical or different and selected from C.sub.2-C.sub.4-alkylene, n is an integer in the range from 1 to 10, and R.sup.1 is C.sub.1-C.sub.4-Alkyl, whereby the corresponding disodium dialcoholate is obtained, reacting the disodium dialcoholate obtained in step (i) with an alkylation alkenylation reagent. ##STR00001##

The present invention relates to a method for preparing a dialkyi or dialkenyl ether of a cycloaliphatic or araliphatic diol, which comprises (i) reacting the cycloaliphatic or araliphatic diol with metallic sodium in an aprotic organic solvent in the presence of a catalytic amount of at least one monoether-monoalcohol of formula (I) wherein Y is identical or different and selected from C.sub.2-C.sub.4-alkylene, n is an integer in the range from 1 to 10, and R.sup.1 is C.sub.1-C.sub.4-Alkyl, whereby the corresponding disodium dialcoholate is obtained, reacting the disodium dialcoholate obtained in step (i) with an alkylation alkenylation reagent. ##STR00001##

The present invention relates to a method for preparing a dialkyi or dialkenyl ether of a cycloaliphatic or araliphatic diol, which comprises (i) reacting the cycloaliphatic or araliphatic diol with metallic sodium in an aprotic organic solvent in the presence of a catalytic amount of at least one monoether-monoalcohol of formula (I) wherein Y is identical or different and selected from C.sub.2-C.sub.4-alkylene, n is an integer in the range from 1 to 10, and R.sup.1 is C.sub.1-C.sub.4-Alkyl, whereby the corresponding disodium dialcoholate is obtained, reacting the disodium dialcoholate obtained in step (i) with an alkylation alkenylation reagent.

The present invention relates to a method for preparing a dialkyi or dialkenyl ether of a cycloaliphatic or araliphatic diol, which comprises (i) reacting the cycloaliphatic or araliphatic diol with metallic sodium in an aprotic organic solvent in the presence of a catalytic amount of at least one monoether-monoalcohol of formula (I) wherein Y is identical or different and selected from C.sub.2-C.sub.4-alkylene, n is an integer in the range from 1 to 10, and R.sup.1 is C.sub.1-C.sub.4-Alkyl, whereby the corresponding disodium dialcoholate is obtained, reacting the disodium dialcoholate obtained in step (i) with an alkylation alkenylation reagent.

There is provided a novel alkoxymagnesium which, when used as a constituent of a solid catalyst component for olefin polymerization to polymerize an olefin, may reduce the formation rate of a fine powder and may form a polymer having an excellent particle size distribution under high polymerization activity. The alkoxymagnesium is characterized by comprising secondary particles each of which is an aggregate of primary particles having an average particle diameter of less than 1 μm and by having a ratio represented by the average particle diameter of the primary particles/the average particle diameter of the secondary particles of 0.1 or less, a total pore volume of 0.5 to 1 cm.sup.3/g, a specific surface area of less than 50 m.sup.2/g, and a particle size distribution index (SPAN) 1 or less.

There is provided a novel alkoxymagnesium which, when used as a constituent of a solid catalyst component for olefin polymerization to polymerize an olefin, may reduce the formation rate of a fine powder and may form a polymer having an excellent particle size distribution under high polymerization activity. The alkoxymagnesium is characterized by comprising secondary particles each of which is an aggregate of primary particles having an average particle diameter of less than 1 μm and by having a ratio represented by the average particle diameter of the primary particles/the average particle diameter of the secondary particles of 0.1 or less, a total pore volume of 0.5 to 1 cm.sup.3/g, a specific surface area of less than 50 m.sup.2/g, and a particle size distribution index (SPAN) 1 or less.

There is provided a novel alkoxymagnesium which, when used as a constituent of a solid catalyst component for olefin polymerization to polymerize an olefin, may reduce the formation rate of a fine powder and may form a polymer having an excellent particle size distribution under high polymerization activity. The alkoxymagnesium is characterized by comprising secondary particles each of which is an aggregate of primary particles having an average particle diameter of less than 1 μm and by having a ratio represented by the average particle diameter of the primary particles/the average particle diameter of the secondary particles of 0.1 or less, a total pore volume of 0.5 to 1 cm.sup.3/g, a specific surface area of less than 50 m.sup.2/g, and a particle size distribution index (SPAN) 1 or less.

A method for manufacturing calcium diglyceroxide crystals includes at least the following steps: placing at least one calcium element source compound, in particular calcium oxide, in suspension in glycerol or in a homogeneous mixture of glycerol and an anhydrous solvent of glycerol, in particular methanol, referred to as the starting suspension, the molar ratio being greater than or equal to 2; milling the starting suspension at an ambient temperature of less than or equal to 50 C. in a three-dimensional liquid-phase ball mill for a holding time of 15 minutes or less; recovering, at the outlet of the mill, a suspension of calcium diglyceroxide crystals, and optionally, washing the obtained suspension with a glycerol solvent in order to eliminate any excess glycerol, optionally, drying the suspension of calcium diglyceroxide crystals so as to obtain a powder of calcium diglyceroxide crystals. Also disclosed are uses associated with the calcium diglyceroxide crystals.

A method for manufacturing calcium diglyceroxide crystals includes at least the following steps: placing at least one calcium element source compound, in particular calcium oxide, in suspension in glycerol or in a homogeneous mixture of glycerol and an anhydrous solvent of glycerol, in particular methanol, referred to as the starting suspension, the molar ratio being greater than or equal to 2; milling the starting suspension at an ambient temperature of less than or equal to 50 C. in a three-dimensional liquid-phase ball mill for a holding time of 15 minutes or less; recovering, at the outlet of the mill, a suspension of calcium diglyceroxide crystals, and optionally, washing the obtained suspension with a glycerol solvent in order to eliminate any excess glycerol, optionally, drying the suspension of calcium diglyceroxide crystals so as to obtain a powder of calcium diglyceroxide crystals. Also disclosed are uses associated with the calcium diglyceroxide crystals.

A method for manufacturing calcium diglyceroxide crystals includes at least the following steps: placing at least one calcium element source compound, in particular calcium oxide, in suspension in glycerol or in a homogeneous mixture of glycerol and an anhydrous solvent of glycerol, in particular methanol, referred to as the starting suspension, the molar ratio being greater than or equal to 2; milling the starting suspension at an ambient temperature of less than or equal to 50 C. in a three-dimensional liquid-phase ball mill for a holding time of 15 minutes or less; recovering, at the outlet of the mill, a suspension of calcium diglyceroxide crystals, and optionally, washing the obtained suspension with a glycerol solvent in order to eliminate any excess glycerol, optionally, drying the suspension of calcium diglyceroxide crystals so as to obtain a powder of calcium diglyceroxide crystals. Also disclosed are uses associated with the calcium diglyceroxide crystals.