Vinyl chloride microsuspension polymerisation process

Details Vinyl chloride microsuspension polymerisation process Vinyl chloride microsuspension polymerisation process

C - Chemistry, Metallurgy

08

F

402/375, 402/544

C08F 14/06 (2006.01) C08F 2/20 (2006.01)

Patent

CA 1214300

ABSTRACT OF THE DISCLOSURE: Vinyl chloride polymerisation in aqueous microsuspension in which the free-radical forming initiator is activated with a monomer-soluble metallic complex which is progressively introduced or progressively produced in-situ throughout the polymerisation so as to maintain a substantially constant reaction rate, the metallic complex being formed by the reaction between a water-soluble metal salt (preferably cupric sulphate) and a complexing agent (preferably ascorbic acid) - the complexing agent causing the metal to change from its water soluble form to a monomer-soluble form - wherein the homogenisation conditions are selected to yield a polymer latex having a particle size distribution defined by having a width at half height of the differential weight distribution (v1/2) within the range 0.50 to 1.80 µm, typical ranges being 0.50 to 0.80 µm and 0.90 to 1.80 µm.

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