Aqueous dispersions containing multi-stage emulsion polymers

Details Aqueous dispersions containing multi-stage emulsion polymers Aqueous dispersions containing multi-stage emulsion polymers

2007-10-23

2007-10-23

Sanders, Kriellion A (Department: 1714)

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...

C524S461000, C524S521000, C524S522000, C524S555000, C526S201000, C523S201000

Reexamination Certificate

active

10712512

ABSTRACT:
Aqueous dispersions are disclosed, having a minimum film formation temperature no greater than about 50° C., that include a multi-stage emulsion polymer made by a process that includes a first polymerization stage, in which a first monomer mixture having a calculated glass transition temperature of at least about 50° C. is polymerized via free radical emulsion polymerization to obtain a first-stage emulsion polymer, and a second polymerization stage, in which a second monomer mixture, having a calculated glass transition temperature from about −30° C. to about 10° C., is polymerized via free radical emulsion polymerization, in the presence of the first-stage emulsion polymer. The dispersions are useful in a variety of coating compositions that exhibit improved block resistance.

REFERENCES:
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patent: 5596035 (1997-01-01), Désor et al.
patent: 6005042 (1999-12-01), Désor et al.
patent: 6875834 (2005-04-01), Gray et al.
patent: 1 149 875 (2001-10-01), None
patent: 1 302 515 (2003-04-01), None
patent: WO 98/08882 (1998-03-01), None

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