Powdered coatings compositions
View Patent ↗Provided are compositions of matter which exist in a powdered, free-flowing form to which water is added preferable just prior to the time of use, to yield flowable liquid compositions which are spreadable, dispersible or sprayable onto various substrates. In some embodiments such free-flowing compositions contain water-soluble styrene/acrylic acid copolymers, and can surprisingly comprise relatively large amounts of water on the order of about 20% or more, while remaining in the form of a free-flowing powder prior to their combination with additional water to yield the spreadable, dispersible or sprayable liquid compositions. By the present disclosure, shelf life concerns are eliminated, as the compositions provided have an essentially indefinite shelf life, and transportation and handling ease are greatly increased over prior art compositions due to less weight by the absence of large relative quantities of water present in prior art compositions.
1. A composition of matter useful for providing a coating, paint or repair product which comprises:
a) at least one water-soluble styrenic copolymer of an acrylic acid species, said styrenic copolymer being present in any amount between 30% and 80% by weight based on the total weight of said composition;
b) at least one emulsifying agent; and
c) at least one non-film-forming particulate substance, said non-film-forming
particulate substance comprising a compound selected from the group consisting of: calcium carbonate, zinc oxide, titanium dioxide, copper oxide, silicon dioxide, chromium (III) oxide, and zirconium dioxide, said composition existing as a free-flowing powder, the water content of said composition being between 0.5% and 25% by weight based on the total weight of the composition.
2. A composition according to claim 1 wherein said emulsifying agent is a surfactant selected form the group consisting of: amphoteric surfactants, zwitterionic surfactants, ionic surfactants, cationic surfactants, and nonionic surfactants.
3. A composition according to claim 1 further comprising a polymeric extender.
4. A composition according to claim 1 further comprising a thickening agent.
5. A composition according to claim 4 wherein said thickening agent is polyvinyl alcohol.
6. A composition according to claim 1 further comprising a second film-forming polymer that is non-styrenic.
7. A composition according to claim 1 wherein said acrylic acid species is selected from the group consisting of: methacrylic acid, ethacrylic acid, propacrylic acid, and butacrylic acid.