Continuous emulsion polymerization of vinyl acetate and...

Details Continuous emulsion polymerization of vinyl acetate and... Continuous emulsion polymerization of vinyl acetate and...

C - Chemistry, Metallurgy

08

F

400/1350, 400/65

C08F 2/22 (2006.01) C08F 10/02 (2006.01) C08F 18/08 (2006.01) C08F 263/04 (2006.01)

Patent

CA 1121533

ABSTRACT OF THE DISCLOSURE This invention relates to an improved continuous process for producing vinyl acetate-ethylene copolymer emulsions. The improvement for continuous polymerization of vinyl acetate and ethylene comprises continuously charging a reaction mixture containing vinyl acetate and ethylene to a polymerization vessel, conducting an initial polymerization of the vinyl acetate and ethylene in the presence of a seed latex under ethylene pressure and continuously removing the thus formed latex from the initial polymerization vessel at an unreacted vinyl acetate monomer content from 5-20% by weight of the latex and then effecting a post polymerization of the unreacted vinyl acetate at an ethylene pressure of not more than about 300 psia until the unreacted vinyl acetate in the latex is less than 1% by weight.

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