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

2005-11-15

2010-11-02

Egwim, Kelechi C (Department: 1796)

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

Synthetic resins

Processes of preparing a desired or intentional composition...

C524S460000, C526S201000

Reexamination Certificate

active

07825173

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 mixture A of olefinically unsaturated, free-radically polymerizable monomers, comprising at least one monomer with at least one acid group in a proportion corresponding to an acid value of mixture A of 10 to 100 mg of KOH/g and 0.5 to 5 wt. % of at least one olefinically polyunsaturated monomer, in the aqueous phase,2) neutralization of acid groups of the polymer formed in process step 1) and3) free-radical polymerization of at least one mixture B of olefinically unsaturated, free-radically polymerizable monomers, comprising at least one monomer with at least one acid group in a proportion corresponding to an acid value of mixture B or each of the mixtures B of 0 to below 5 mg of KOH/g, at least one monomer with at least one hydroxyl group in a proportion corresponding to a hydroxyl value of mixture B or each of the mixtures B of 0 to below 5 mg of KOH/g and at least one olefinically polyunsaturated monomer in a proportion of 0.5 to 5 wt. %, relative to mixture B or each of the mixtures B, in the presence of the product obtained in process step 2),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: 5618888 (1997-04-01), Choi et al.
patent: 1 008 635 (2000-06-01), None
patent: 1008635 (2000-06-01), None
patent: WO 03/064487 (2003-08-01), None

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