Preparation of aqueous polymer dispersions having a polymer cont

Details Preparation of aqueous polymer dispersions having a polymer cont Preparation of aqueous polymer dispersions having a polymer cont

1981-03-20

1983-02-01

Schofer, Joseph L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

523344, 524606, 524831, 526 80, 526 79, 526 82, 5263291, 5263292, C08L 3506

Patent

active

043716598

ABSTRACT:
Aqueous polymer dispersions containing up to 75% by weight of polymer are prepared advantageously by emulsion copolymerization in the presence of conventional anionic emulsifiers, polymerization initiators and small amounts of polymerization inhibitors, at conventional polymerization temperatures, by copolymerizing at least two monomers A, which per se are not copolymerizable with one another, mixed with from 60 to 95% by weight of at least one monomer B, which is copolymerizable with both monomers A, in the presence of a polymerization inhibitor, by the emulsion feed process, wherein (a) the initial aqueous phase at the start of the monomer emulsion feed contains from 0.01 to 0.5% by weight of anionic emulsifier and from 1 to 7% by weight of water-soluble salts, (b) the monomer emulsion contains from 50 to 500 ppm of polymerization inhibitor, (c) from 1 to 10% by weight of the monomer emulsion is added, within the first 1/2 hour from the start of the feed, at an increasing rate per unit time, to the initial charge and thereafter (d) the remaining monomer emulsion is added in a conventional manner in accordance with the rate of polymerization of the monomers.

REFERENCES:
patent: 2321759 (1943-06-01), Macht et al.
patent: 2605257 (1952-07-01), Wolf et al.
patent: 2817648 (1957-12-01), Gould et al.
patent: 3248356 (1966-04-01), Snyder
patent: 3365409 (1968-01-01), Lanthier
patent: 3948867 (1976-04-01), Bader et al.
patent: 4265796 (1981-05-01), Mueller-Mall et al.

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