Ultrafiltration of vinyl resin latices and reuse of permeate in

Details Ultrafiltration of vinyl resin latices and reuse of permeate in Ultrafiltration of vinyl resin latices and reuse of permeate in

1979-10-22

1982-07-20

Henderson, C. A.

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

Synthetic resins

Removing and recycling removed material from an ongoing...

210636, 526212, 526225, 526228, C08F 226, C08F 620

Patent

active

043407021

ABSTRACT:
There is disclosed a process of preparing vinyl dispersion resins by conducting the polymerization reaction of the vinyl monomer or monomers in an aqueous medium in the presence of a polymerization initiator or catalyst and an emulsifier or emulsifier system to form a vinyl resin latex, which is then subjected to an ultrafiltration step by forcing the same through a semipermeable membrane leaving behind the polymer particles and reusing the permeate, which contains dissolved monomer(s) and emulsifier, in the further production of vinyl resin latices. Unexpectedly, further use of the permeate substantially reduces polymer buildup in the reactor and since the ultrafiltration step increases the polymer particle concentration in the latex, considerable heat energy is saved in the spray-drying step.

REFERENCES:
patent: 3129207 (1964-04-01), James
patent: 3324097 (1967-06-01), Pears
patent: 3956114 (1976-05-01), Del Pico
patent: 3974068 (1976-08-01), Ebner
patent: 3977967 (1976-08-01), Trulson
patent: 4076920 (1978-02-01), Mikofalvy
patent: 4082659 (1978-04-01), Heinze
patent: 4160726 (1979-07-01), Del Pico

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