Emulsion polymer blend coating compositions and methods for increasing chalky substrate adhesion
AssigneeColumbia Insurance Company
InventorsYong Yang, Yakov Freidzon, Robert Sheerin, Luz Clarena Shavel
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Abstract
The present invention relates to a coating composition containing a polymer blend dispersion including: a first polymer having a relatively low molecular weight and a relatively low glass transition temperature and comprising a self-crosslinking monomer; and a second polymer having a relatively high molecular weight and a relatively high glass transition temperature. Latex paint compositions and architectural coatings containing the coating composition according to the invention are also described herein, as well as substrates coated therewith.
Claims35
A latex composition comprising a polymer blend of a first polymer and a second polymer, wherein:
- the first polymer is made from first constituent monomers, has a number average molecular weight greater than about 7,000 Daltons and less than about 40,000 Daltons and a polydispersity index of less than about 4.5, has a glass transition temperature from about −20° C. to about 60° C., and comprises a self-crosslinking monomer;
- the second polymer is made from second constituent monomers, has a number average molecular weight greater than about 80,000 Daltons, and has a glass transition temperature from about −20° C. to about 60° C.;
- the glass transition temperature of the second polymer is at least about 10° C. higher than the glass transition temperature of the first polymer;
- and
- the relative proportion of the first polymer to the second polymer is from about 1:4 to 4:3 by weight.
A latex composition comprising a polymer blend of a first polymer and a second polymer, wherein:
- the first polymer is made from first constituent monomers, has a number average molecular weight greater than about 7,000 Daltons and less than about 40,000 Daltons and a polydispersity index of less than about 4.5, has a glass transition temperature from about −20° C. to about 60° C., and comprises a self-crosslinking monomer;
- the second polymer is made from second constituent monomers, has a number average molecular weight greater than about 100,000 Daltons, and has a glass transition temperature from about −20° C. to about 60° C.;
- the glass transition temperature of the second polymer is at least 10° C. higher than the glass transition temperature of the first polymer;
- the polymer blend is substantially free from sequentially polymerized polymers;
- and
- the first constituent monomers, the second constituent monomers, or both, are substantially free from phosphorus-containing pendant groups, from polyacid-containing pendant groups, or from both.
A latex composition comprising a polymer blend of a first polymer and a second polymer, wherein:
- the first polymer is made from first constituent monomers, has a number average molecular weight greater than about 7,000 Daltons and a weight average molecular weight less than about 70,000 Daltons, and a polydispersity index of less than 4.5 has a glass transition temperature from about −20° C. to about 60° C., and comprises a self-crosslinking monomer;
- the second polymer is made from second constituent monomers, has a weight average molecular weight greater than about 250,000 Daltons, and has a glass transition temperature from about −20° C. to about 60° C.;
- the glass transition temperature of the second polymer is at least about 10° C. higher than the glass transition temperature of the first polymer;
- and the relative proportion of the first polymer to the second polymer is from about 1:4 to 4:3 by weight.
Dependencies are inferred from the claim text.