Akzona Incorporated

Akzo N.v.

Willem F Verhelst

Reinder Torenbeek

Ulfert Elle Wiersum

Petrus H Schreurs

Aqueous emulsions of a polymerization initiator are used for suspension (co)polymerization reactions. The aqueous emulsions contain: (a) an organic peroxide which is liquid at -5.degree. C.; (b) an aliphatic monohydric alcohol having 1-4 carbon atoms and/or aliphatic glycol having 2-4 carbon atoms; (c) a surfactant and/or a protective colloid; and (d) water. The emulsions may be transported while in a liquid state at a temperature of -10.degree. C. to -25.degree. C. with minimal decrease in active oxygen content.

Peroxide emulsions containing an antifreezing compound

This disclosure relates to aqueous peroxide emulsions and the use thereof in suspension (co)polymerization reactions. In particular, the aqueous peroxide emulsions comprise: a) 20-60% by weight of an organic peroxide which is liquid at -5.degree. C.; b) 2-20% by weight of an aliphatic monohydric alcohol having 1-4 carbon atoms and/or aliphatic glycol having 2-4 carbon atoms; c) a surfactant and/or a protective colloid; and d) water. The emulsions of the present disclosure may be transported while in a liquid state at a temperature of -10.degree. C. to -25.degree. C. with minimal decrease in active oxygen content.

This disclosure relates to aqueous peroxide emulsions and the use thereof in suspension (co)polymerization reactions. In particular, the aqueous peroxide emulsions comprise: (a) 20-60% by weight of an organic peroxide which is liquid at -5.degree. C.; (b) 2-20% by weight of an aliphatic monohydric alcohol having 1-14 carbon atoms and/or aliphatic glycol having 2-4 carbon atoms; (c) a surfactant and/or a protective colloid; and (d) water. The emulsions of the present disclosure may be transported while in a liquid state at a temperature of -10.degree. C. to -25.degree. C. with minimal decrease in active oxygen content.

Peroxide emulsions containing an anti-freezing compound

An improved process for the suspension polymerization of vinyl chloride in the presence of a radical initiator and at least two suspension stabilizers is disclosed. The improvement comprises performing the polymerization in the presence of at least one primary stabilizer selected from the group consisting of water-soluble partially hydrolyzed polyvinyl acetates and methyl hydroxypropyl cellulose and at least one secondary stabilizer selected from the group consisting of N-alkyl gluconamides wherein the alkyl group contains from about 16 to about 20 carbon atoms.

Process for the suspension (CO)polymerization of vinyl chloride

This disclosure relates to a process for the degradation of polymers in the presence of a free radical initiator. In particular this disclosure relates to a process for the degradation of polymers employing a free radical initiator selected from a class of hydroximic acid derivatives.

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Gorssel, Netherlands

Willem F Verhelst