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OwnerLloyd I. Osipow, Dorothea C. Marra +1inventors
InventorsLloyd I. Osipow, Dorothea C. Marra, J. George Spitzer
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Compositions and a process for manufacture are provided for synthetic polymer-propellant systems that form cohesive foamed structures from which aqueous solutions can be expressed, where the useful temperature range over which these structures form is broadened by using a propellant mixture consisting predominantly of a propellant that is a poor solvent for the polymer and has a vapor pressure in the range of 10-35 psig at 20 C in combination with a small amount of a propellant that is a good solvent for the polymer; and where these coherent foamed structures can be formed even with aqueous solutions containing 0 to about 30% alcohol, provided that insoluble fine-particle solids that do not pack and become difficult to redisperse are included in the composition.
A process for the manufacture of a polymer-propellant composition that forms a coherent foamed structure from which an aqueous solution can be expressed consisting of about 5% to about 40% by weight of polymer selected from the group consisting of acrylic and methacrylic acid ester homopolymers and copolymers, from 25% to 60% by weight of an aqueous solution containing from 0 to 60% alcohol, from 20% to 60% by weight of propellant based on the weight of the composition, said process comprising dispersing the polymer in the aqueous solution and dosing said dispersion into a container prior to adding the propellant, adding the propellant to the container and subjecting the resulting composition in the container to a shaking action to bring the dispersed polymer particles into contact with the propellant thereby causing the polymer particles to dissolve quickly in the propellant.
Dependencies are inferred from the claim text.