Aqueous dispersions containing multi-stage emulsion polymers
First Claim
1. An aqueous dispersion, having a minimum film formation temperature no greater than about 50°
- C., comprising a multi-stage emulsion polymer made by a process that comprises;
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, the first monomer mixture comprising;
from about 80 to about 99.5% by weight of one or more ethylenically unsaturated non-ionic monomers;
from 0 to about 5% by weight of one or more ethylenically unsaturated weak acid monomers;
from 0 to about 5% by weight of one or more ethylenically unsaturated strong acid monomers; and
from 0 to about 10% by weight of one or more ethylenically unsaturated monomers containing a keto group,wherein the first monomer mixture contains at least about 0.5% by weight of at least one of the ethylenically unsaturated strong acid monomers or the ethylenically unsaturated weak acid monomers, or mixtures thereof; 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, to obtain the multi-stage emulsion polymer, the second monomer mixture comprising;
from about 80 to about 99.5% by weight of one or more ethylenically unsaturated non-ionic monomers;
from 0 to about 5% by weight of one or more ethylenically unsaturated weak acid monomers;
from about 0.5 to about 10% by weight of one or more ethylenically unsaturated strong acid monomers; and
from about 0.5% to about 10% by weight of one or more ethylenically unsaturated monomers containing a keto group.
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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.
46 Citations
19 Claims
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1. An aqueous dispersion, having a minimum film formation temperature no greater than about 50°
- C., comprising a multi-stage emulsion polymer made by a process that comprises;
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, the first monomer mixture comprising;from about 80 to about 99.5% by weight of one or more ethylenically unsaturated non-ionic monomers; from 0 to about 5% by weight of one or more ethylenically unsaturated weak acid monomers; from 0 to about 5% by weight of one or more ethylenically unsaturated strong acid monomers; and from 0 to about 10% by weight of one or more ethylenically unsaturated monomers containing a keto group, wherein the first monomer mixture contains at least about 0.5% by weight of at least one of the ethylenically unsaturated strong acid monomers or the ethylenically unsaturated weak acid monomers, or mixtures thereof; 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, to obtain the multi-stage emulsion polymer, the second monomer mixture comprising;from about 80 to about 99.5% by weight of one or more ethylenically unsaturated non-ionic monomers; from 0 to about 5% by weight of one or more ethylenically unsaturated weak acid monomers; from about 0.5 to about 10% by weight of one or more ethylenically unsaturated strong acid monomers; and from about 0.5% to about 10% by weight of one or more ethylenically unsaturated monomers containing a keto group. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
- C., comprising a multi-stage emulsion polymer made by a process that comprises;
Specification