Water-based coating compositions that resist dirt pickup

Patent metadata

Field	Value
Publication number	US-11312867-B2
Application number	US-202017111210-A
Country	US
Kind code	B2
Filing date	Dec 3, 2020
Priority date	Sep 12, 2014
Publication date	Apr 26, 2022
Grant date	Apr 26, 2022

Abstract

Water-based compositions containing a low VOC coalescent, a latex or water-dispersible polymer are described.

First claim

What is claimed is:

1. A low VOC paint, comprising:
a latex polymer comprising a surfactant and polymer particles comprising a homopolymer or copolymer and including at least one of an acrylate or a methacrylate;
methyl-o-benzoyl benzoate; and
at least one coalescent;
wherein the latex polymer is synthesized from ethylenically unsaturated compounds including 2-acetoacetoxyethyl methacrylate (AAEM); and
wherein the paint includes no greater than 5 grams of total VOC per 100 grams polymer solids.

2. The paint of claim 1 , wherein the paint forms a coalesced film at a temperature of 4° C. to 10° C.

3. The paint of claim 1 , wherein the coalescent has a volatile organic content of no greater than 11 wt % and has a number average molecular weight of less than 500.

4. The paint of claim 1 further comprising a pigment.

5. The paint of claim 4 , wherein the pigment comprises TiO 2 .

6. The paint of claim 4 , wherein the pigment is present in a pigment volume concentration of 35-75 for a flat paint and 20-40 for a semi-gloss paint.

7. The paint of claim 1 , wherein the at least one coalescent is selected from tributyl phosphate, tris(butoxyethyl) phosphate, isopropylated triphenyl phosphate, alkyl diphenyl phosphate, triaryl phosphate ester, t-butylated triphenyl phosphate, 2-ethylhexyl diphenyl phosphate, isodecyl diphenyl phosphate, linear alkyl diphenyl phosphate, and mixtures thereof.

8. The paint of claim 1 which is stable such that the coalescent does not phase separate from the paint on standing at 120° F. (49° C.) for four weeks.

9. The paint of claim 1 , wherein the coalescent is present in a sufficient amount to facilitate the formation of a polymer film of a latex polymer at a temperature less than 25° C.

10. The paint of claim 1 , wherein the coalescent is present in an amount of 1-20 wt-%, based on polymer solids.

11. The paint of claim 10 , wherein the latex polymer is synthesized from ethylenically unsaturated compounds including 2-acetoacetoxyethyl methacrylate (AAEM).

12. The paint of claim 10 , wherein the latex polymer is synthesized from ethylenically unsaturated compounds including diacetone acrylamide.

13. The paint of claim 10 , wherein the paint includes no greater than 2 grams of total VOC per 100 grams polymer solids.

14. The paint of claim 1 , wherein the coalescent has the formula:
(R 1 —O) n P(═O)—[—O(X) m —O—R 2 ] 3-n

wherein:
R 1 and R 2 are each independently H, an aliphatic group having at least 3 and less than 100 carbon atoms, an aromatic group having at least 3 and less than 100 carbon atoms;
X is a divalent hydrocarbyl group having at least one and no more than 12 carbon atoms;
m is an integer between 0 and 15; and
n is an integer between 0 and 3,
with the proviso that R 1 and R 2 together do not include any aliphatic unsaturated carbon-carbon bonds.

15. The paint of claim 1 , wherein the latex polymer is a gradient Tg polymer.

16. The paint of claim 1 , wherein the latex polymer is a multi-stage latex.

17. The paint of claim 16 , wherein the latex polymer includes a first stage having a Tg of 0° C. to 70° C. and a second stage of −20° C. to 0° C.

18. A low VOC paint, comprising:
a latex polymer comprising a surfactant and polymer particles comprising a homopolymer or copolymer and including at least one of an acrylate or a methacrylate,
methyl-o-benzoyl benzoate, and
at least one coalescent;
wherein the latex polymer is synthesized from ethylenically unsaturated compounds including diacetone acrylamide; and
wherein the paint includes no greater than 5 grams of total VOC per 100 grams polymer solids.

19. The paint of claim 1 , A low VOC paint, comprising:
a latex polymer comprising a surfactant and polymer particles comprising a homopolymer or copolymer and including at least one of an acrylate or a methacrylate,
methyl-o-benzoyl benzoate, and
at least one coalescent;
wherein the latex polymer has at least one Tg within a range of 0° C. to 50° C., and wherein the latex polymer is synthesized from ethylenically unsaturated compounds including acetoacetyl ethyl methacrylate, diacetone acrylamide, or a mixture thereof.

Assignees

• Swimc Llc

Inventors

• Hibben Mary Jane
• Wildman Michael
• Killilea T Howard
• Harvey Iain

Classifications

• C09D133/08 Primary

  Homopolymers or copolymers of acrylic acid esters · CPC title

• C09G1/04

  Aqueous dispersions (C09G1/02 takes precedence) · CPC title

• C08K2003/2241

  Titanium dioxide · CPC title

• C09D121/02

  Latex · CPC title

• C09D133/10

  Homopolymers or copolymers of methacrylic acid esters · CPC title