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Aqueous coating compositions with improved transparency

A technology of water-based coatings and compositions, which can be used in coatings, pigment pastes, latex paints, etc., and can solve problems such as inefficiency

Inactive Publication Date: 2004-12-15
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While these dispersants are effective in stabilizing metallic flake pigments in aqueous systems, they are not sufficiently effective when used alone to stabilize transparent iron oxide pigments

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0058] The polymer dispersant is prepared and formulated into a pigment dispersion liquid, and then the pigment dispersion liquid is formulated into the transparent coating composition.

[0059] Polymer Dispersant 1

[0060] Polymer Dispersant 1 is an example of a random acrylic copolymer with acid functional groups in the pigment absorbing segment consisting of methyl methacrylate (MMA), butyl acrylate (BA), acrylic acid (AA), methyl Composed of 2-hydroxyethyl acrylate (HEMA) and 2-acrylamido-2-methylpropanesulfonic acid (AMPS), the weight ratio is 37.5 / 50.2 / 5.1 / 5.1 / 2.1, the number average molecular weight is 20000, polydispersity 2. This polymer is prepared by standard anionic polymerization as described in US Patent 4,656,226, which is incorporated herein by reference. The polymer solution was neutralized with 2-aminomethylpropanol and diluted with deionized water and isopropanol to a solid content of 50% before use.

[0061] Polymer Dispersant 2

[0062] Polymer Dis...

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PUM

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Abstract

An aqueous coating composition having improved transparency and reduced haze containing: (a) an aqueous carrier medium; (b) transparent iron oxide pigment particles stabilized by (c) a mixture of acrylic copolymer pigment dispersants; (d) a film forming polymeric binder; and (e) a crosslinking agent for the binder.

Description

technical field [0001] This invention relates to aqueous coating compositions, and more particularly to improved clarity and reduced haze, aqueous coating compositions comprising dispersions of a synergistic mixture of transparent iron oxide pigments and acrylic copolymer pigment dispersants. technical background [0002] The use of transparent iron oxide pigments in coating compositions, particularly for the exterior trim of cars and trucks, to form decorative coatings of high clarity, attractiveness and aesthetic quality is well known. A high degree of film clarity is especially important for automotive coatings containing metallic flake pigments such as aluminum flakes, since a high metallic luster is to be imparted to the trim. In order to obtain highly transparent films, the pigment particles must not be flocculated at all, but dispersed uniformly in the coating composition. Pigment dispersions stabilized with copolymer dispersants are generally used to disperse and ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D5/02C09D17/00C09D133/00C09D133/14C09D133/26
CPCC09D5/027C09D17/001C09D17/007C09D5/02
Inventor P·F·麦因泰雷K·B·维舍尔K·S·基尔申鲍姆
Owner EI DU PONT DE NEMOURS & CO