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Aqueous dispersions of microparticles having a nanoparticulate phase and coating compositions containing the same

A water-based dispersion, nanoparticle technology, applied in coatings and other directions, which can solve problems such as dullness, impact, chip resistance and unfavorable flexibility

Inactive Publication Date: 2010-06-23
PPG IND OHIO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, some resinous grind vehicles, such as acrylic grind vehicles, may adversely affect coating properties such as chip resistance and flexibility
[0007] Regular and pigment particles and clumps may have an average particle size large enough to scatter visible light, resulting in cloudy and dull coatings

Method used

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  • Aqueous dispersions of microparticles having a nanoparticulate phase and coating compositions containing the same
  • Aqueous dispersions of microparticles having a nanoparticulate phase and coating compositions containing the same
  • Aqueous dispersions of microparticles having a nanoparticulate phase and coating compositions containing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment A

[0141] polyurethane prepolymer

[0142] This example describes the preparation of polyurethane prepolymers that were subsequently used to form each of the pigment dispersions of Example 1 and the latexes of Examples 1 and 2. The polyurethane was prepared from a mixture of the following ingredients in the following proportions.

[0143] Element

equivalent

weight / gram)

Feed I

N-Methylpyrrolidone

671.0

Dimethylolpropionic acid (DMPA)

9.0

603.6

Triphenyl phosphite

6.0

Dibutyltin dilaurate

6.0

Feed II

Hydroxyethyl Methacrylate (HEMA)

4.5

585.6

[0144] Element

equivalent

weight / gram)

Butylated hydroxytoluene

6.0

poly(butylene oxide) 1

6.0

3000.0

Feed III

Tetramethylxylylene Diisocyanate (TMXDI)

15.0

1831.5

Feed IV

...

Embodiment B

[0148] polyester prepolymer

[0149] This example describes the preparation of polyester prepolymers that were subsequently used to form the latexes of Examples 1 and 2. The polyester was prepared from a mixture of the following ingredients in the following proportions.

[0150] Element

equivalent

weight / gram)

Feed I

1,6-Hexanediol

64.30

3800.0

maleic anhydride

14.68

720.0

Adipic acid

9.86

720.0

Isophthalic acid

23.60

1960.0

Dibutyltin oxide

7.2

[0151] Element

equivalent

weight / gram)

Triphenyl phosphite

14.4

Feed II

Butyl acrylate

1084.0

Hydroxypropyl Methacrylate

542.0

IONOL 1

14.4

[0152] 1 Butylated hydroxytoluene, commercially available from Shell Chemical Co.

[0153] Polyurethane prepolymers were prepared in four-necked round b...

Embodiment C

[0155] Polyurethane / urea prepolymer

[0156] This example describes the preparation of polyurethane / urea prepolymers, which were subsequently used to form each of the latexes of Examples 3 and 5. The polyurethane / urea was prepared from a mixture of the following ingredients in the following proportions.

[0157] Element

equivalent

weight / gram)

Feed I

N-Methylpyrrolidone

232.7

Hydroxyethyl methacrylate

1.0

130.1

Dimethylpropionic acid

4.0

268.3

Triphenyl phosphite

2.6

Dibutyltin dilaurate

2.6

Butylated hydroxytoluene

2.6

Feed II

poly(butylene oxide) 1

2.0

1000.0

[0158] Element

equivalent

weight / gram)

Feed III

4,4'-Methylene bis(cyclohexyl isocyanate)

8.0

1048.0

Feed IV

Butyl acrylate

200.0

Feed V ...

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Abstract

The present invention is directed to an aqueous dispersion of microparticles comprising nanoparticulates, and to methods of preparing the dispersion, as well as to compositions containing such dispersions. The dispersion is prepared by (a) providing a plurality of nanoparticulates having an average particle size of 300 nanometers or less; (b) admixing the nanoparticulates with a solventborne water-disperable polymer or with (1) one or more polymerizable ethylenically unsaturated monomers; and / or (2) a mixture of one or more polymerizable unsaturated monomers with one or more polymers; and / or (3) one or more polymers, to form an admixture; (c) subjecting the admixture to high stress shear conditions in the presence of either an organic solvent or an aqueous medium to particularize the admixture into microparticles; and (d) optionally, polymerizing the ethylenically unsaturated monomers under free radical polymerization conditions.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Patent Application No. 60 / 482,167, filed June 24,2003. This application is also related to concurrently filed US Patent Applications No. ____ and _______. field of invention [0003] The present invention relates to an aqueous dispersion of microparticles having a polymer phase and a nanoparticle phase and the use of the dispersion in coating compositions. Background of the invention [0004] Coating compositions typically include a colorant dispersed in a resin binder system along with extender pigment particles to impart color and / or performance in the resulting coating. Pigment particles tend to have a strong affinity for each other and tend to aggregate to form clumps unless separated by, for example, other materials. [0005] Typically, these colorant and / or filler particles are dispersed in a resinous grind vehicle and optionally a dispersant by crushing or mi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F2/16C08F2/44C08F292/00C08L51/10C09D151/10C09D7/80
CPCC08F2/44C08F292/00
Inventor D·L·菲勒A·D·库尔芬J·B·奥德怀尔E·L·德克尔B·E·伍德沃斯L·S·拉顿
Owner PPG IND OHIO INC
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