Process for the manufacture of aqueous ethylene/vinyl chloride/v

Details Process for the manufacture of aqueous ethylene/vinyl chloride/v Process for the manufacture of aqueous ethylene/vinyl chloride/v

1979-08-02

1981-01-27

Welsh, Maurice J.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C08L 2706

Patent

active

042474388

ABSTRACT:
Aqueous ethylene/vinyl chloride/vinyl alkanoate and/or alkyl acrylate copolymer dispersions having a non-uniform particle size distribution, in which one particle size distribution maximum is at 0.03 to 0.2.mu. and a second maximum is at 0.15 to 1.mu. and in which 5% to 60% by weight of the particles belong to the amount of particles having said second maximum, which are produced by free-radical polymerization at 0.degree. to 90.degree. C., while stirring, in the presence of emulsifiers which, in amounts of 0.5% to 15% by weight, calculated on the final solid resin, are not added until a polymerization conversion of 1% to 60% by weight of the total amount of monomer has been reached. The copolymer dispersions have solids contents of 20% to 70% by weight of copolymer comprising 20% to 92% by weight of vinyl chloride, 5% to 60% by weight of ethylene and 3% to 75% by weight of vinyl esters and/or acrylic acid esters, and, optionally, up to 15% by weight of other monomers copolymerizable with ethylene and vinyl chloride, said monomers being metered into the polymerization mixture together with the emulsifiers during the manufacturing process.

REFERENCES:
patent: 3632542 (1972-01-01), Fox et al.
patent: 3639326 (1972-02-01), Kray et al.
patent: 3830761 (1974-08-01), Lenney

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