Multi-stage latex polymers, process of making the same, and coating compositions made thereof
AssigneesDow Global Technologies LLC, Rohm and Haas Company
InventorsWei Cui, Tao Wang, Longlan Cui, James C. Bohling
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Abstract
A latex polymer of multi-stage polymerization comprising a first stage polymer and a second stage polymer wherein the first stage polymer comprises a first portion of an acrylic monomer and a first portion of a phosphorus acid monomer, and the second stage polymer comprises a second portion of an acrylic monomer and a second portion of a phosphorus acid monomer. A process of making such latex polymer.
Claims12
A latex polymer of multi-stage polymerization comprising a first stage polymer and a second stage polymer wherein the first stage polymer comprises a first portion of an acrylic monomer and a first portion of a phosphorus acid monomer, and the second stage polymer comprises a second portion of an acrylic monomer and a second portion of a phosphorus acid monomer;
- wherein the amount of the first portion of the phosphorus acid monomer is from 2 to 8 weight percent of total weight of the first stage polymer;
- the amount of the second portion of the phosphorus acid monomer is from 41 to 150 weight percent of total weight of the first portion of the phosphorus acid monomer;
- the first portion of the acrylic monomer is from 5 to 20 weight percent of total weight of the first and the second portions of the acrylic monomer;
- and the Tg of the latex polymer is in the range of −20° C. to 50° C.
A process comprising a) contacting under emulsion polymerization conditions a first portion of an acrylic monomer with a first portion of a phosphorus acid monomer to form a first stage polymer;
- and b) contacting the first stage polymer with a second portion of an acrylic monomer and a second portion of a phosphorus acid monomer under emulsion polymerization conditions to form a latex polymer;
- wherein the amount of the first portion of the phosphorus acid monomer is from 2 to 8 weight percent of total weight of the first stage polymer;
- the amount of the second portion of the phosphorus acid monomer is from 41 to 150 weight percent of total weight of the first portion of the phosphorus acid monomer;
- the first portion of the acrylic monomer is from 5 to 20 weight percent of total weight of the first and the second portions of the acrylic monomer;
- and the Tg of the latex polymer is in the range of −20° C. to 50° C.
Dependencies are inferred from the claim text.