Process for obtaining aqueous polymer dispersions

Details Process for obtaining aqueous polymer dispersions Process for obtaining aqueous polymer dispersions

2007-05-22

2007-05-22

Egwim, Kelechi C. (Department: 1713)

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

Synthetic resins

Removing only nonpolymerized or nonpolymerizable material...

C526S087000, C526S088000, C526S318400, C526S328000, C526S328500

Reexamination Certificate

active

10477420

ABSTRACT:
The process comprises the following phases: formation of a pre-emulsion of monomers in water; transfer into the polymerisation reactor with stirring, of (1) reaction stock consisting of a water solution of a surfactant, in an amount by weight relative to the weight of final polymer dispersion of 1–15%; (2) a portion of the pre-emulsion prepared in the previous phase, in an amount of 1%–10% by weight of the initial pre-emulsion; phase C.1: initiation of the polymerisation ; phase C.2: polymerisation of the monomer mixture at 30–90° C., by gradually adding into the reactor, separately, the initiator solution and the remaining portion of the pre-emulsion with an added salt, which is soluble in water at 25° C. to at least 1% by weight, in an amount so as to have a salt concentration in the added pre-emulsion of 0.02–0.25% by weight; phase C.3: scrubbing of the residual monomers.

REFERENCES:
patent: 3637563 (1972-01-01), Christena
patent: 4642323 (1987-02-01), Ranka et al.
patent: 6028135 (2000-02-01), Keller et al.
patent: 6225401 (2001-05-01), Rehmer et al.
patent: 197 48 546 (1999-05-01), None
patent: 19748546 (1999-05-01), None

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