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Problems solved by technology
[0007] Although phosphate-functional latexes provide paints with improved hiding properties, this approach involves polymerization process complexity, and some phosphate-containing latex polymers are known to be due to two TiO 2 Particles exhibit an undesirable increase in viscosity through aggregation caused by "bridging" of individual polymeric latex particles
Method used
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Embodiment 1
[0116] In a suitable reaction vessel equipped with a thermometer, condenser and stirrer, the initial reactor charge was heated to 85-86° C. under a nitrogen blanket while the charges A to M described in Table 2 were prepared. At 85°C, Charge C was added to the reaction vessel together with the rinse and the temperature was adjusted to 80-85°C, then Charge D was charged to the kettle. Within 2 minutes, the onset of polymerization was signaled by a temperature rise of 3° to 5°C and a change in the appearance (color and opacity) of the reaction mixture. When the exotherm ceased, the remainder of the monomer mixture, Feed A, and co-fed catalyst solution Feed F were gradually added to the reaction vessel at about 85°C over 125 minutes. Simultaneously, Feed B was simultaneously added to the reaction vessel at about 85°C over 60 minutes. After 60 minutes, after the end of Feed B, the vessel containing Feed B was rinsed and the rinse was added to the reactor. After the purge, Feed E...
Embodiment 2
[0118] The acrylic dispersion of Example 2 was prepared in the same manner as in Example 1 except that 4.0 wt % of GMA-IDA monomer was added. The polymers were prepared using monomer emulsions containing the monomer ratios described in Table 2.
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PUM
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Abstract
The present invention provides an aqueous opaque coating formulation comprising (A) and aqueous solvent; (B) an inorganic material; and (C) a chelating polymer which comprises units derived from one or more aminocarboxylate compounds or their salts, one or more other polymerizable monomers, one or more ethylenically unsaturated monomers and, optionally, one or more crosslinking monomers. For example, the aminocarboxylate compounds or their salts may be one or more of iminodiacetic acid (IDA), iminodisuccinic acid (IDS), ethylenediamine triacetic acid (ED3A) and ethylenediamine disuccinic acid (EDDS), or their salts. Suitable polymerizable monomers may be one or more of glycidyl methacrylate (GMA), allyl glycidyl ether (AGE), vinylbenzyl chloride (VBC), allyl bromide, and their derivatives. The inorganic material may be a pigment, such as titanium dioxide (Ti02) or cadmium sulfide (CdS), or an extender or filler, such as talc (Mg3Si4Oio(OH)2), calcium carbonate (CaC03) or mica, or even combinations thereof.
Description
technical field [0001] The present invention relates to waterborne opaque coating formulations having good tint strength, viscosity and freeze / thaw stability. These formulations comprise an aqueous solvent; an inorganic pigment; and a chelating polymer comprising units derived from one or more aminocarboxylic acid compounds or salts thereof, and one or more other monomers . Background technique [0002] It is often desirable to modify or enhance the appearance of various types of substrates, such as wood, plastic, metal, ceramic, gypsum board (i.e., drywall or plasterboard), Paper, fibers and others, which are used in many applications such as floor coverings, interior and exterior walls, ceilings, roofs, architectural finishes, motor vehicle bodies, containers, bags, pipes and many more. The ability, sometimes referred to as hiding power or tint strength, of opaque aqueous coating formulations such as paints, primers, adhesive sealers, and other opaque coatings to obscure...
Claims
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