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High acid aqueous nanocomposite dispersions

A technology of nanocomposite materials and dispersions, applied in nanotechnology, nanotechnology, nanostructure manufacturing, etc.

Inactive Publication Date: 2005-06-01
ROHM & HAAS CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is therefore an object of the present invention to solve the aforementioned problems associated with the preparation of aqueous dispersions of alkali-swellable or alkali-soluble nanocomposites using unmodified clays

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0120] Example 1: Alkali-soluble resin containing 4.5% unmodified clay

[0121] The latex was synthesized by the following method: Under stirring conditions, an empty reactor tank was filled with 460.8g of deionized water, 0.90g of anionic surfactant (33% aqueous solution) and 7.0g (4.5wt%) of unmodified Sodium montmorillonite clay, which is sold under the trade name "PGV Clay" by Nanocor of Arlington Heights, Ill. Heat the contents of the tank to 85°C and keep it for 10 minutes, then add a solution of 1.2 g of sodium acetate in 15.0 g of deionized water (DI water) under continuous stirring and heating, and keep the contents of the reactor at 85°C. Keep it for another 5 minutes. In another container, a monomer emulsion was formed, which contained: 44.2 g water, 8.2 g anionic surfactant (33% aqueous solution), 15.0 g styrene, 97.5 g methyl methacrylate ("MMA"), 37.5 g Methacrylic acid ("MAA") and 0.051 moles of alkyl mercaptan were used to control the molecular weight to obtain MN ...

Embodiment 3 to 4

[0124] Examples 3 to 4: Alkali-soluble resin with 10% and 15% unmodified clay

[0125] Two latexes were prepared in the same manner as in Example 1, except that 10 wt% and 15 wt% of unmodified sodium montmorillonite PGV clay based on polymer solids were added to the reaction tank, respectively. The latex was neutralized to a pH of 9.5. The viscosity of the resulting ammonia-neutralized, polymer clay nanocomposite is listed in Table I below.

Embodiment 5 to 7

[0126] Examples 5 to 7: Unmodified clay mixed with alkali-soluble resin-clay-added before neutralization

[0127] The product of Example 2 was mixed with unmodified sodium montmorillonite PGV clay, and the weight percentage of clay based on polymer solids was 4.5% (Example 5), 10% (Example 6) and 15%, respectively. (Example 7). The clay and DI water (95g clay / 905g DI water) were stirred at 85°C for 4 hours to form an aqueous clay dispersion. The aqueous clay dispersion was then mixed with the latex product of Example 2 under stirring. The mixture was then neutralized to a pH of 9.5. The viscosity of the resulting polymer clay nanocomposite material neutralized by ammonia is listed in Table I below.

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Abstract

The present invention relates in part to polymer clay nanocomposites having acid-containing monomers and clay. In one embodiment, there is provided a method of preparing an aqueous polymer clay nanocomposite dispersion, wherein the method comprises: providing an aqueous dispersion comprising at least one clay, optionally at least one olefinic unsaturated monomers, and optionally at least one surfactant; providing a monomer mixture comprising at least 10% by weight of the monomer mixture of acid-containing monomers, and optionally a surfactant; water mixing the dispersion with the monomer mixture; and polymerizing the monomers to form a nanocomposite dispersion, wherein the clay is at least partially exfoliated in the nanocomposite dispersion. The invention also relates to the use of these compositions, for example as thickeners, dispersants, plastic additives, adhesives, coatings, offset printing inks, overprint varnishes and dry cement powder modifiers.

Description

Invention field [0001] The present invention generally relates to polymer clay nanocomposite material water dispersions and methods for their preparation and use. More specifically, the present invention relates to a method for preparing polymer clay nanocomposite dispersions derived from acid-containing monomers and clays, which can be used as, for example, alkali-swellable and alkali-soluble Thickener. The present invention also relates to the use of these nanocomposite material compositions, for example, as dispersants, adhesives, coatings, print pastes, overprint varnishes, dry powder cement modifiers, personal care products, household or industrial Cleaning agent or offset printing ink. Background of the invention [0002] Alkali swellable and alkali soluble thickener copolymers ("AST") are generally carboxy functional copolymers prepared by the free radical polymerization of ethylenically unsaturated monomers. Reference, Gregory D. Shaw, "Alkali-Swellable and Alkali-Soluble...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/44C01B33/40C04B22/06C04B24/26C04B103/40C08F2/00C08F2/10C08F2/16C08F2/44C08F265/04C08F265/06C08F291/00C08F292/00C08K9/00C08K9/04C08K9/08C08L51/00C08L101/00C09D5/00C09D5/02C09D7/12C09D11/02C09D125/00C09D133/00C09D135/00C09D151/00C09D151/10C09D157/10C09D201/00C09J11/04C09J151/00C09J201/00
CPCB82Y30/00C08F2/00C08F2/44C08F265/06C08F292/00C08K9/04C08K9/08C08K2201/011B82B3/00
Inventor D·P·劳拉R·V·斯隆
Owner ROHM & HAAS CO
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