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Opaque wet, see-through dry weather-resistive barriers and methods for making

A barrier layer, weatherability technology applied in the field of self-inspection coatings, which can solve problems such as difficult to know coating thickness, over application, coating opacity, etc.

Active Publication Date: 2014-06-11
ROHM & HAAS CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, existing forms of these coatings are used to mask the underlying plate and are opaque at almost any applied thickness
Therefore, it is difficult to know how thick the applied coating is and there is a high risk of under-application or over-application

Method used

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  • Opaque wet, see-through dry weather-resistive barriers and methods for making
  • Opaque wet, see-through dry weather-resistive barriers and methods for making
  • Opaque wet, see-through dry weather-resistive barriers and methods for making

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0072] EXAMPLES: The following examples illustrate the invention.

[0073] In Examples 1-15 below, each of the three emulsion polymers was formulated as shown in Table 1, and five coatings were prepared using calcium carbonate with the indicated % PVC as the extender. A 50% PVC coating was first formulated and then diluted to the indicated formulation with the indicated emulsion polymer to produce a formulation of 25% PVC and 10% PVC extender. One paint formulated from each of the three emulsion polymers contained 10% PVC titanium dioxide (opacifier) ​​and one paint formulated from each of the three emulsion polymers contained no pigments or extenders agent, 0% PVC.

[0074] The materials used in the examples are as follows:

[0075] Acrylic: butyl acrylate / methyl methacrylate emulsion copolymer, 55% (w / w) solids, Tg (glass transition temperature) -40°C, weight average particle size 350nm;

[0076] SB styrene / butadiene emulsion copolymer, 51% (w / w) solids, Tg is -26°C, weig...

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PUM

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Abstract

The present invention provides aqueous self-inspecting wet coatings or films that dry to form translucent to clear weather-resistive barriers on a substrate, preferably a building substrate such as sheathing. The coatings comprise, as a wet film, one or more aqueous emulsion or dispersion polymer that can form a film in use conditions and less than 6% pigment volume concentration (% PVC), of one or more opacifier, one or more extender in amounts up to critical % pigment volume concentration (CPVC), optionally, one or more pigment, and substantially no void, hollow core, or hollow sphere containing pigment. The coatings or films enable one to apply the correct amount of coating to make a weather barrier that dries to a see-through coating or film.

Description

technical field [0001] The present invention relates to self-inspecting coatings prepared from aqueous emulsion or dispersion polymers which, when dry, provide a weather-resistant barrier through which the user can see coated substrate. More specifically, the present invention relates to self-verifying wet coatings that are opaque when wet and capable of Forming a translucent to transparent coating, wherein the coating comprises one or more aqueous emulsion polymer coating compositions comprising extenders up to a critical % pigment volume concentration (CPVC), less than 6 % PVC, preferably one or more opacifiers equal to or less than 4% PVC, optional other pigments, and substantially free of pigments comprising cavities or hollow spheres, the present invention also relates to coated building substrates and Methods of making said coatings. Background technique [0002] Buildings are often constructed using wood, cement or gypsum based exterior sheets or panels such as she...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D133/08C09D125/10C09D131/04C09D7/12
CPCC09D125/10C09D131/04C08L2201/50C09D135/06C08L9/08C09D133/06C08L2201/52C09D5/00Y10T428/249992Y10T428/249993Y10T428/31899Y10T428/31906Y10T428/31931Y10T428/31935C08L27/06
Inventor M·D·鲍J·C·泽瓦扎克
Owner ROHM & HAAS CO
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