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US 4,056,213 AGranted
Pressurized dispenser for aqueous emulsion paints
AssigneeMartin Paint and Chemical Corporation
InventorDavid Stern
Life of this patent
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AssigneeMartin Paint and Chemical Corporation
InventorDavid Stern
Estimating the term…
The invention relates to an improved pressurized dispenser for aqueous emulsion paints whose vehicle consists of a major proportion of water and a minor proportion of an acrylic polymer or polyvinyl acetate-acrylic copolymer, the emulsion being discharged as a fine spray but without foaming and without clogging of the nozzle orifice by dried paint even after repeated fractional discharges. The paint is contained in a collapsible piston within the pressurized container and the stream of paint discharging upon opening of the valve of the container is broken up by a mechanical breaker before being discharged through the nozzle in the form of a fine spray devoid of propellant, the latter being contained under pressure between the piston and the wall of the container. Means are provided in the form of a cap for the nozzle so constructed so as to reduce or substantially eliminate the space about the nozzle after use of portions of the contents of the package to prevent drying out of any paint adhering to the nozzle and thereby clogging the nozzle.
A pressurized dispenser for aqueous latex paint wherein the binder is an acrylic polymer or a vinyl acetate-lower alkyl acrylic ester copolymer, comprising a container having therein a collapsible piston adapted to contain a latex paint with a propellant under pressure in the space between the piston and the wall of the container, a valve controlling the discharge of paint from within the piston, a nozzle into which the paint is conducted for discharge in the form of a spray or mist, and a cap for closing the nozzle orifice and providing at most a free evaporation space about the nozzle orifice which is less in volume than is required for the evaporation, to a substantially solid residue, of any paint clinging to the wall of the nozzle orifice at the termination of a fractional discharge of the contents of the container.
A packaged aqueous acrylic emulsion paint comprising a pressurized dispenser, including a container, a discharge nozzle, the container having therein a collapsible piston containing a quantity of said paint, a propellant under pressure in the space between the piston and the wall of the container, a valve controlling the discharge of paint from within the piston, and a nozzle into which the paint is conducted for discharge in the form of a spray, said emulsion comprising an aqueous suspension consisting, in addition to water, essentially of a member of the group consisting of a polymer of a lower alkyl ester of acrylic acid or methacrylic acid, the alkyl group containing up to 4 carbon atoms, or of a copolymer of such lower alkyl ester with polyvinyl acetate, together with a pigment in an amount corresponding to 2 to 15% by weight of the paint, and an antifoam agent, said dispenser, upon opening of the valve, discharging the paint in a form substantially free from foam due in part to the absence of propellant in the paint.
Dependencies are inferred from the claim text.