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| OF THE INVENTION Coating compositions which comprise water as the continuous phase and contain in ... |
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| Glass fiber reinforced thermoplastic molding compositions based on polyesters and graft polymers |
| We claim: 1. A thermoplastic molding composition containing as essential components (A) from 45 to 9... |
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| Flame retardant thermoplastic elastomer |
| I claim: 1. A flame retardant thermoplastic elastomer comprising a blend of (A) an ethylene-... |
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| Hot melt size and yarns sized therewith |
| OF THE INVENTION In one embodiment the hot melt size compositions of the present invention ... |
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| Thermoplastic resinoid hot melt compositions |
| I claim as my invention: 1. a thermoplastic resinoid hot melt composition which is rigid at room ... |
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| Insulating composition and articles made therefrom |
| OF THE INVENTION A composition which has been found to be particularly useful as insulation for ... |
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| Synergistic reinforcement promoter systems for filled polymers |
| OF THE INVENTION Hydrocarbon Polymer The invention relates to filled hydrocarbon polymers whose ... |
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| Stainless steel tubular element with improved wear resistance |
| It is an object of the invention to improve the resistance to frictional wear of stainless steel ... |
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| Method of and article for masking |
| What is claimed is: 1. Correction sheet for obliterating graphic symbols or characters on a flat ... |
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Waterbased coating composition of methylol(meth)acrylamide acrylic polymer, acrylic hydrosol and melamine crosslinking agent
| Details |
Inventors: Nickle, Stanley K.; Werner, Jr., Ervin R.;
Assignee: E. I. Du Pont de Nemours and Company (Wilmington, DE)
Primary Examiner: Schofer; Joseph L.
Assistant Examiner: Smith; Jeffrey T.
Attorney, Agent or Firm: Fricke; Hilmar L.
A waterbased coating composition formed of an acrylic latex and an acrylic hydrosol dispersed in an aqueous carrier and has a pH of about 7-10; wherein the binder is a blend of an acrylic latex polymer having a particle size of about 0.06-0.20 microns and an acrylic hydrosol polymer having a particle size of less than 0.30 microns; wherein the blend contains a. a methylol (meth)acrylamide carboxyl containing acrylic latex polymer of polymerized monomers of alkyl methacrylate, alkyl acrylate or mixtures thereof, 1-15% by weight of methylol methacrylamide, methylol acrylamide or mixtures thereof, 0.5-10% by weight of ethylenically unsaturated carboxylic acid having reactive carboxyl groups, 0.5-10% by weight of ethylenically unsaturated hydroxyl and the carboxyl groups of the polymer are reacted with ammonia or an amine; b. an acrylic hydrosol polymer of methylol (meth)acrylamide acrylic polymer containing carboxyl and hydroxyl groups about 0.5-10% by weight of an ethylenically unsaturated carboxylic acid, 0.5-10% by weight of ethylenically unsaturated hydroxyl and the carboxyl groups of the polymer are reacted with ammonia or an amine and c. an alkylated melamine formaldehyde crosslinking agent and the composition forms an automotive quality clear coat and/or pigmented color coat. |
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DETAILED DESCRIPTION OF THE INVENTION The term "latex" as used herein means a dispersion in an aqueous carrier of polymer particles having a particle size of about 0.
06-0.
20 microns and a weight average molecular weight of greater than 500,000.
The term "hydrosol" as used herein means a fine dispersion in an aqueous carrier of polymer particles having a particle size of less than 0.
30 microns, preferably less than 0.
15 microns and more preferably less than 0.
01 microns and a weight average molecular weight of less than 100,000.
The coating composition of the invention is stable for extended periods of time, has a very low VOC (volatile organic content), can be pigmented with all existing commercial pigments used for automobiles and trucks and due to the compatible nature of the acrylic latex and the acrylic polymer hydrosol forms finishes that are hard, glossy, weatherable and durable.
In particular, the composition has excellent adhesion to a variety of substrates such as previously painted substrates, cold rolled steel, phosphatized steel, steel coated with conventional primers such as electrodeposition primers that typically are crosslinked epoxy polyesters and various epoxy resin, alkyd resin repair primers, plastic substrates such as polyester reinforced fiber glass, reaction injection molded urethanes and partially crystalline polyamides.
A clear coat can be applied to a layer of the pigmented composition to provide a clear/color coat finish.
The coating composition used for the clear coat can be the coating composition of this invention or another compatible aqueous or solvent based coating composition.
The coating composition can be used as a primer over cold rolled steel, treated steel such as phosphatized steel or the aforementioned plastic substrates.
The primer provides a surface to which a topcoat will adhere such as a topcoat of the coating composition of this invention as described above.
The coating composition has a film forming binder content of about 10-30% by weight and correspondingly, about 90-70% by weight of an aqueous carrier which is primarily water but often contains small amounts of organic solvents for the binder
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