Abstract: The invention relates to an organic peroxide emulsion comprising at least one organic peroxide comprising di-sec-butyl peroxydicarbonate, at least one emulsifier, at least one antifreeze, and water; said emulsion being free of methanol and ethanol. The invention also relates to a process for preparing such an emulsion, to the use of such an emulsion for the polymerization or copolymerization of one or more ethylenically unsaturated monomers, and also to a halogenated vinyl polymer obtained by using such an emulsion.

Abstract: An aqueous emulsion of dialkyl peroxide has at least one dialkyl peroxide in liquid form at room temperature, representing between 10% and 75% by weight of the emulsion, at least one emulsifier representing from 0.01% to 10% by weight of the emulsion, optionally, at least one antifreeze, optionally at least one functional additive, water, the amount of which is determined so as to form the rest of said emulsion (100%), characterized in that the emulsifier is a polyethoxylated nonionic surfactant. Also, a process for preparing this aqueous emulsion.

Abstract: An aqueous emulsion of dialkyl peroxide has at least one dialkyl peroxide in liquid form at room temperature, representing between 10% and 75% by weight of the emulsion, at least one emulsifier representing from 0.01% to 10% by weight of the emulsion, optionally, at least one antifreeze, optionally at least one functional additive, water, the amount of which is determined so as to form the rest of said emulsion (100%), characterized in that the emulsifier is a polyethoxylated nonionic surfactant. Also, a process for preparing this aqueous emulsion.

Abstract: An aqueous emulsion composition of organic peroxide, including from 10 to 65% by weight of one or a plurality of organic peroxides, from 2 to 25% by weight of at least one antifreeze agent, from 0.01 to 10% by weight of at least one emulsifying agent, optionally at least one additive, water, of which the quantity is defined in order to form the remainder of the total composition (100%), wherein the emulsifying agent is a colloid agent of a polyvinyl acetate having a degree of hydrolysis greater than 80% and a viscosity, measured in solution in water at 4% by weight at 20° C., less than or equal to 5 mPa·s, said viscosity being measured with a Brookfield RVT viscometer, needle no. 3, 20 rpm, in accordance with the ISO 2555 standard. Also, to the method of preparing same and the use thereof.

Abstract: An aqueous emulsion composition of organic peroxide, including from 10 to 65% by weight of one or a plurality of organic peroxides, from 2 to 25% by weight of at least one antifreeze agent, from 0.01 to 10% by weight of at least one emulsifying agent, optionally at least one additive, water, of which the quantity is defined in order to form the remainder of the total composition (100%), wherein the emulsifying agent is a colloid agent of a polyvinyl acetate having a degree of hydrolysis greater than 80% and a viscosity, measured in solution in water at 4% by weight at 20° C., less than or equal to 5 mPa·s, said viscosity being measured with a Brookfield RVT viscometer, needle no. 3, 20 rpm, in accordance with the ISO 2555 standard. Also, to the method of preparing same and the use thereof.

Abstract: A process for the preparation of expandable polystyrene including the following steps: i°) heating an aqueous suspension including styrene monomer and at least one organic peroxide initiator of formula (I) 1-alkoxy-1-t-alkylperoxycyclohexane in which the alkoxy group contains 1 to 4 carbon atoms, the t-alkyl group contains 4 to 12 carbon atoms, and the cyclohexane ring may optionally be substituted with 1 to 3 alkyl groups each, independently having 1 to 3 carbon atoms, at a temperature ranging from 100° C. to 120° C.), ii°) adding a blowing agent selected from the group of alkanes having from 4 to 6 carbon atoms and mixtures thereof. Also, an expandable polystyrene obtainable according to such a process and to insulation parts and packaging including such an expandable polystyrene.

Abstract: A process for the preparation of expandable polystyrene including the following steps: i°) heating an aqueous suspension including styrene monomer and at least one organic peroxide initiator of formula (I) 1-alkoxy-1-t-alkylperoxycyclohexane in which the alkoxy group contains 1 to 4 carbon atoms, the t-alkyl group contains 4 to 12 carbon atoms, and the cyclohexane ring may optionally be substituted with 1 to 3 alkyl groups each, independently having 1 to 3 carbon atoms, at a temperature ranging from 100° C. to 120° C., ii°) adding a blowing agent selected from the group of alkanes having from 4 to 6 carbon atoms and mixtures thereof. Also, an expandable polystyrene obtainable according to such a process and to insulation parts and packaging including such an expandable polystyrene.

Abstract: A process for the preparation of expandable polystyrene including the following steps: i°) heating an aqueous suspension including styrene monomer and at least one organic peroxide initiator of formula (I) 1-alkoxy-1-t-alkylperoxycyclohexane in which the alkoxy group contains 1 to 4 carbon atoms, the t-alkyl group contains 4 to 12 carbon atoms, and the cyclohexane ring may optionally be substituted with 1 to 3 alkyl groups each, independently having 1 to 3 carbon atoms, at a temperature ranging from 100° C. to 120° C.), ii°) adding a blowing agent selected from the group of alkanes having from 4 to 6 carbon atoms and mixtures thereof. Also, an expandable polystyrene obtainable according to such a process and to insulation parts and packaging including such an expandable polystyrene.

Abstract: The present invention relates to a process for the preparation of expandable polystyrene comprising the following steps: io) heating an aqueous suspension comprising styrene monomer and at least one organic peroxide initiator of formula (I) 1-alkoxy-1-t-alkylperoxycyclohexane in which the alkoxy group contains 1 to 4 carbon atoms, the t-alkyl group contains 4 to 12 carbon atoms, and the cyclohexane ring may optionally be substituted with 1 to 3 alkyl groups each, independently having 1 to 3 carbon atoms, at a temperature ranging from 100° C. to 120° C., iio) adding a blowing agent selected from the group consisting of alkanes having from 4 to 6 carbon atoms and mixtures thereof. The invention also relates to an expandable polystyrene obtainable according to such a process and to insulation parts and packaging comprising such an expandable polystyrene.