Semi-continuous emulsion polymerization process

Details Semi-continuous emulsion polymerization process Semi-continuous emulsion polymerization process

1988-11-10

1990-08-07

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...

524804, 524832, 526 65, 526 66, 526 80, 526 87, 526 88, 52631844, 5263295, 526909, C08F 222, C08F21808

Patent

active

049468910

ABSTRACT:
A method of carrying out a continuous aqueous emulsion copolymerization using a single continuously stirred tank reactor to reduce the particle size distribution and the presence of over-sized particles comprises, slowly supplying to a reactor the materials used in the copolymerization, including the monomers which are copolymerized, while maintaining conditions causing copolymerization to proceed until the reactor is filled. The supply is continued while maintaining those conditions until the total supply is in the range of from about 1.5 to about 5 reactor volumes. The excess material in the reactor is removed therefrom and collected in one or more separate vessels, and the product of the copolymerization is then combined and mixed to form a uniform product. The composition copolymerized can be changed during the copolymerization. The emulsion copolymer product is particularly useful in latex paints where it improves the gloss and scrub resistance of the paint.

REFERENCES:
patent: 2587562 (1952-02-01), Wilson
patent: 3546154 (1970-12-01), Hwa et al.
patent: 4219454 (1980-08-01), Iacoviello et al.
patent: 4301264 (1981-11-01), Moore et al.

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