Process for the production of aqueous binder latices

Details Process for the production of aqueous binder latices Process for the production of aqueous binder latices

2011-02-15

2011-02-15

Egwim, Kelechi C (Department: 1762)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C525S330200, C524S460000

Reexamination Certificate

active

07888439

ABSTRACT:
A process for the production of aqueous binder latices by multistage emulsion polymerization in the aqueous phase, comprising the successive steps:1) free-radical polymerization of a monomer mixture A comprising acidic monomers in a proportion corresponding to an acid value of 10 to 100 mg of KOH/g and olefinically polyunsaturated monomers in a proportion of 0.5 to 5 wt %,2) neutralization of acid groups of the polymer formed in process step 1) and3) free-radical polymerization of at least one monomer mixture B comprising acidic monomers in a proportion corresponding to an acid value of mixture(s) B of 0 to below 5 mg of KOH/g, hydroxyl-functional monomers in a proportion corresponding to a hydroxyl value of mixture(s) B of 0 to below 5 mg of KOH/g and olefinically polyunsaturated monomers in a proportion of 0.5 to 5 wt %,wherein the monomer composition of mixtures A and B is selected in such a manner that the calculated glass transition temperature (Tg) of a copolymer composed of a combination of only the olefinically monounsaturated monomers of mixtures A and B is in the range from 30 to 100° C., wherein the ratio by weight of mixture A to the at least one mixture B is from 15:85 to 85:15 and wherein neutralization is not begun in process step 2) until at least 90 wt. % of the monomers of mixture A have been polymerized to completion.

REFERENCES:
patent: 4876313 (1989-10-01), Lorah
patent: 1008635 (2000-06-01), None
patent: WO2006/118974 (2006-11-01), None
T. Brock, M. Groteklaes and P. Mischke, European Coatings Handbook, 2000, Curt R. Vincentz Verlag, Hannover, pp. 43-44.

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