Catalyst solution dispenser for a hand-held liquid spraying apparatus
AssigneeE.I. duPont de Nemours and Company
InventorKamlesh Kumar Bhatia
Life of this patent
Estimating the term…
Abstract
A dispenser for dispensing a polymerization catalyst solution into a liquid coating formulation has a cross sectional area “a” given by the relationship: a≅P·A·[W/w]·10−6, where “A” is the cross sectional area of the reservoir holding a liquid coating formulation having “W” weight percent of solids; “w” is the weight percent of catalyst in the dispenser; and P is the ratio by weight of the catalyst to the solids desired in the finished coating, in parts per million.
Claims19
A dispenser for use in combination with a spraying apparatus for applying a liquid coating formulation to a surface to produce a finished coating, the liquid coating formulation having “W” weight percent of solids therein,
- the spraying apparatus having a housing with a flow channel extending therethrough and a reservoir for holding the liquid coating formulation, the reservoir being open to the atmosphere and being in fluid communication with the flow channel, the reservoir having a cross sectional area “A”,
- wherein the dispenser comprises:
- a generally tubular body member having a closure at both a first and a second end thereof, the dispenser holding a predetermined volume of a polymerization catalyst solution having “w” weight percent of catalyst therein,
- the tubular body member having a predetermined cross sectional area “a”, wherein the cross sectional area “a” is given by the relationship:
- a≅P·A·[W/w]·10−6,
- where P is the ratio by weight of the catalyst to the solids desired in the finished coating, in parts per million,
- so that, in use, after opening of the closure at the first end, when the dispenser is insertable into a liquid coating formulation in the reservoir to a position such that, after opening of the closure at the second end, the liquid head of the liquid coating formulation in the reservoir prevents flow of the catalyst solution from the dispenser until the liquid coating formulation flows from the reservoir into the flow channel,
- whereby the catalyst solution mixes with the coating formulation in a way that a predetermined concentration of the catalyst solution is maintained as the liquid coating formulation flows from the reservoir.
A spraying apparatus for applying a liquid coating formulation to a surface to produce a finished coating, the liquid coating formulation having “W” weight percent of solids therein, the spraying apparatus comprising:
- a housing with a flow channel extending therethrough;
- a reservoir for holding the liquid coating formulation, the reservoir being open to the atmosphere and being in fluid communication with the flow channel, the reservoir having a cross sectional area “A”,
- a catalyst solution dispenser disposed within the reservoir, the dispenser being in the form of a generally tubular body member having a closure at both a first and a second end thereof, the dispenser holding a predetermined volume of a polymerization catalyst solution having “w” weight percent of catalyst therein,
- the tubular body member having a predetermined cross sectional area “a”, wherein the cross sectional area “a” is given by the relationship:
- a≅P·A·[W/w]·10−6,
- where P is the ratio by weight of the catalyst to the solids desired in the finished coating, in parts per million,
- so that, in use, after opening of the closure at the first end, the dispenser is insertable into a liquid coating formulation in the reservoir to a position such that, after opening of the closure at the second end, the liquid head of the liquid coating formulation in the reservoir prevents flow of the catalyst solution from the dispenser until the liquid coating formulation flows from the reservoir into the flow channel,
- whereby the catalyst solution mixes with the coating formulation in a way that a predetermined concentration of the catalyst solution is maintained as the liquid coating formulation flows from the reservoir.
Dependencies are inferred from the claim text.