Freeze-thaw stable paint formulation

Patent metadata

Field	Value
Publication number	US-9284457-B2
Application number	US-201414536732-A
Country	US
Kind code	B2
Filing date	Nov 10, 2014
Priority date	Nov 15, 2013
Publication date	Mar 15, 2016
Grant date	Mar 15, 2016

Abstract

The present invention relates to a pre-paint composite comprising an aqueous slurry of TiO 2 particles and attached and unattached polymeric binder, and a sufficient amount of a secondary alcohol ethoxylate of the formula C 10-15 H 22-32 O(CH 2 CH 2 O) x H to give 35 to 90 weight percent attachment of polymeric binder to the TiO 2 particles, based on the weight of total polymeric binder in the pre-paint composite, where x is from 15 to 50; and the O(CH 2 CH 2 O) x H group is bonded to a CH group on the C 10-15 H 22-32 chain. The present invention also relates to a coatings composition containing the composite as well as a process for preparing the pre-paint composite and the coatings composition.

First claim

The invention claimed is:

1. A process for preparing a pre-paint composite comprising the steps of:
a) contacting together a mixture of:
i) an aqueous dispersion of TiO 2 particles and an adsorbing sulfur acid functionalized polymer;
ii) an anionic surfactant;
iii) sodium styrene sulfonate; and
iv) a redox initiator system;

to form a first composite intermediate; then
b) contacting under emulsion polymerization conditions the first composite intermediate with a first monomer emulsion comprising:
i) methyl methacrylate or styrene or a combination thereof;
ii) a C 1 -C 10 alkyl acrylate; and
iii) a carboxylic acid containing monomer under emulsion polymerization conditions;

to form a second composite intermediate; then
c) contacting the second composite intermediate with a second monomer emulsion comprising:
i) styrene or methyl methacrylate or a combination thereof;
ii) a C 1 -C 10 alkyl acrylate;
iii) carboxylic acid containing monomer; and
iv) a secondary alcohol ethoxylate of the formula C 12-14 H 26-30 O(CH 2 CH 2 O) x H;

to form an aqueous dispersion of TiO 2 particles with incomplete attachment of polymeric binder; where x is from 20 to 40 and the O(CH 2 CH 2 O) x H group is bonded to a CH group on the C 12-14 H 26-30 chain; wherein the extent of attachment of polymeric binder to the TiO 2 particles is from 35 to 90 weight percent based on the weight of total polymer binder in the pre-paint composite.

2. The process of claim 1 wherein in step a), the adsorbing sulfur acid functionalized polymer is an adsorbing amphoteric polymer; in step b), the first composite intermediate is contacted with methyl methacrylate, butyl acrylate, and methacrylic acid under emulsion polymerization conditions to form a second composite intermediate; and in step c), the second monomer emulsion further comprises a salt of a sulfur acid monomer.

3. The process of claim 2 wherein in step c), the second monomer emulsion comprises styrene, butyl acrylate, sodium styrene sulfonate, methacrylic acid, and the secondary alcohol ethoxylate.

4. The process of claim 3 wherein the concentration of the secondary alcohol ethoxylate is from 0.2 weight percent to 1.5 weight percent, based on the weight of the pre-paint composite.

5. The process of claim 1 wherein the extent of attachment of polymeric binder to the TiO 2 particles is from 50 to 90 weight percent based on the weight of total polymer binder in the pre-paint composite.

6. The process of claim 4 wherein the extent of attachment of polymeric binder to the TiO 2 particles is from 60 to 85 weight percent based on the weight of total polymer binder in the pre-paint composite.

7. The process of claim 1 which further includes the step of preparing a coatings formulation by contacting the pre-paint composite with one or more components selected from the groups consisting of dispersants, surfactants, solvents, defoamers, additional binders, thickeners, extenders, coalescents, biocides, and colorants.

8. A process for preparing a pre-paint composite comprising the steps of:
a) contacting together a mixture of:
i) an aqueous dispersion of TiO 2 particles and an adsorbing sulfur acid functionalized polymer;
ii) an anionic surfactant;
iii) sodium styrene sulfonate; and
iv) a redox initiator system;

to form a first composite intermediate; then
b) contacting under emulsion polymerization conditions the first composite intermediate with a first monomer emulsion comprising:
i) methyl methacrylate or styrene or a combination thereof;
ii) a C 1 -C 10 alkyl acrylate; and
iii) a carboxylic acid containing monomer under emulsion polymerization conditions;

to form a second composite intermediate; then
c) contacting the second composite intermediate with a second monomer emulsion comprising:
i) styrene or methyl methacrylate or a combination thereof;
ii) a C 1 -C 10 alkyl acrylate;
iii) carboxylic acid containing monomer; and
iv) a secondary alcohol ethoxylate of the formula C 10-15 H 22-32 O(CH 2 CH 2 O) x H;

to form an aqueous dispersion of TiO 2 particles with incomplete attachment of polymeric binder; where x is from 15 to 50 and the O(CH 2 CH 2 O) x H group is bonded to a CH group on the C 10-15 H 22-32 chain; wherein the extent of attachment of polymeric binder to the TiO 2 particles is from 35 to 90 weight percent based on the weight of total polymer binder in the pre-paint composite.

9. The process of claim 8 wherein the extent of attachment of polymeric binder to the TiO 2 particles is from 50 to 90 weight percent based on the weight of total polymer binder in the pre-paint composite.

10. The process of claim 9 wherein the extent of attachment of polymeric binder to the TiO 2 particles is from 60 to 85 weight percent based on the weight of total polymer binder in the pre-paint composite and wherein the concentration of the secondary alcohol ethoxylate is from 0.2 weight percent to 1.5 weight percent, based on the weight of the pre-paint composite.

Assignees

• Rohm & Haas

Inventors

• Kelly david g
• Luo Pu
• Rhodes Michael
• Tiwary Yogesh

Classifications

• C09C1/3676

  Treatment with macro-molecular organic compounds · CPC title

• C09D17/008 Primary

  Titanium dioxide · CPC title

• C09D7/62

  modified by treatment with other compounds · CPC title

• C09D7/63

  organic · CPC title

• C09D133/08 Primary

  Homopolymers or copolymers of acrylic acid esters · CPC title