Process for the production of latices based on conjugated dienes by emulsion polymerisation
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United States of America Patent
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May 12, 1998
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app pub date -
Feb 25, 1997
filing date -
Feb 29, 1996
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Abstract
Latices based on conjugated dienes are produced using emulsion polymerization by introducing the monomers to be polymerized into the initially introduced seed latex in the presence of a free-radical forming activator and an emulsifier in such a manner that the ratio of the monomer polymerization rate to the monomer feed rate is less than 0.7:1 and by performing polymerization up to a monomer conversion of .gtoreq.95% at temperatures of 10 to 85.degree. C., wherein the addition of the emulsifier is controlled in such a manner that the final particle size (TG.sub.L) of the latex to be produced is governed by the following equation: TG.sub.L =TG.sub.S .times.(m.sub.L /D.sub.L).sup.1/3 (m.sub.S /D.sub.S).sup.1/3, in which D.sub.L =density of the latex particles in the latex to be produced D.sub.S =density of the particles of the seed used m.sub.L =mass of the latex particles in the latex to be produced m.sub.S =mass of the particles of the seed used TG.sub.L =particle size of the latex to be produced TG.sub.S =particle size of the seed used.
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