초록

This invention concerns sprayable emulsions of a foamable polymer in water which are useful as aerosol caulking or insulating compositions.

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1. A composition suitable for preparing a stable, cellular foam adapted to be dispensed from an aerosol container and maintained under pressure in a container having a value member associated with the container adaptable for continuous dispensing of the contents of the container, the composition com

1. A composition suitable for preparing a stable, cellular foam adapted to be dispensed from an aerosol container and maintained under pressure in a container having a value member associated with the container adaptable for continuous dispensing of the contents of the container, the composition comprising an aqueous emulsion of one or more foamable polymers, filler, a propellent amount of dimethyl ether and a volatile organic liquid compound selected from the group consisting of a volatile hydrocarbon, a volatile halogenated hydrocarbon, and mixtures thereof, wherein the foamable polymers have glass transition temperatures of less than about 15° C. and wherein the foamable polymers are emulsified by a nonionic surfactant having an HLB value of greater than about 15; wherein the ratio of the weight percent of the dimethyl ether to the organic liquid compound is about 9-90:1, and wherein the foam is self-leveling, water resistant, and the volume of the foam is not greater than about six times the volume of said composition. 2. The composition of claim 1 wherein the filler is calcium carbonate. 3. The composition of claim 1 wherein the polymer is of the acetate or acrylate type. 4. The composition of claim 3 wherein the polymer is polybutylacrylate. 5. The composition of claim 1 wherein the weight percent of the polymer is about 15-30%. 6. The composition of claim 1 wherein the weight percent of dimethyl ether is about 2-10%. 7. The composition of claim 1 wherein the volatile organic liquid compound is a hydrocarbon having from 2-7 carbon atoms. 8. The composition of claim 7 wherein the volatile organic liquid compound is a hydrocarbon selected from the group consisting of propane, n-butane, isobutane, n-pentane, 2-methylbutane, n-hexane, cyclopentane, cyclohexane and mixtures thereof. 9. The composition of claim 8 wherein the weight percent of the volatile organic liquid compond is from about 0.2-1.0 percent based on the total weight of the composition. 10. The composition of claim 1 wherein the ratio of the dimethyl ether to the volatile organic liquid compound is about 28-45:1. 11. The composition of claim 1 wherein the weight percent of total solids is about 70-85 percent. 12. The composition of claim 1 wherein the nonionic surfactant is a condensate of a multiplicity of ethanoloxy groups with an aliphatic or alkaryl alcohol. 13. The composition of claim 12 wherein the nonionic surfactant is a condensate of at least 15 moles of ethylene oxide per mole of lauryl alcohol, nonylphenol or octylphenol. 14. The composition of claim 13 wherein the nonionic surfactant is a condensate of from about 15-70 moles of ethylene oxide per mole of lauryl alcohol, nonylphenol or octylphenol. 15. The composition of claim 2 wherein said emulsion comprises about 15 to about 30 parts by weight of polymer, about 0.1 to about 5 percent by weight of nonionic surfactant, about 40-55 percent by weight of calcium carbonate, and about 3-15 percent by weight of a mixture of dimethyl ether and a volatile hydrocarbon. 16. An aerosol container containing therein a dispensable composition comprising one or more foamable polymers having glass transition temperatures of less than about 15° C. emulsified in an aqueous solution of dimethyl ether, wherein said polymers are emulsified by a nonionic surfactant having an HLB value of at least about 15; filler, and dispersed in said emulsion a volatile organic liquid compound selected from the group consisting of a volatile hydrocarbon, a volatile halogenated hydrocarbon, and mixtures thereof, wherein the ratio of the weight percent of the dimethyl ether to the organic liquid compound is about 8-90:1, and said composition being under dimethyl ether and organic liquid gas propellant pressure in said dispenser sufficient to propel said composition from said dispenser and to foam said composition to form a self-levelling, water-resistant foam having a volume not greater than six times the volume of said composition. 17. The aerosol container according to claim 16 wherein said organic liquid compound is a hydrocarbon having at least two carbon atoms. 18. The aerosol container according to claim 17 wherein said organic liquid compound is a hydrocarbon having from two to seven carbon atoms. 19. The aerosol container according to claim 17 wherein said organic liquid compound is a hydrocarbon selected from the group consisting of propane, n-butane, isobutane, n-pentane, 2-methylbutane, n-hexane, cyclopentane, cyclohexane and mixtures thereof. 20. The aerosol container according to claim 19 wherein one or more of said polymers have a mean glass transition temperature of less than -10° C. 21. The aerosol container according to claim 20 wherein said polymer is a homopolymer or a copolymer of ethylenically unsaturated monomers. 22. The aerosol container according to claim 21 wherein said polymer is an acrylic polymer. 23. The aerosol container according to claim 22 wherein said polymers are homopolymers of monomers selected from the group consisting of acrylic acid, methacrylic acid and alkyl esters of acrylic or methacrylic acids, wherein the alkyl moieties include from one to seven carbon atoms. 24. The aerosol container according to claims 21 or 22 comprising from about 35 to about 50 weight percent of an aqueous polymeric emulsion based on the total weight of the composition, wherein said composition has a polymer solids content of from about 15-30 weight percent based on the total weight of the composition. 25. The aerosol container according to claim 18 wherein the weight percent of a said volatile organic liquid compound is from about 0.2 to about 1.0 weight percent based on the total weight of said composition. 26. The aerosol container according to claim 16 wherein the weight of said dimethyl ether is from about 2 to about 10 weight percent based on the total weight of the composition. 27. The aerosol container according to claim 16 wherein the filler is calcium carbonate. 28. The composition according to claims 1, 3, 4 or 15 wherein the viscosity of said emulsion is from about 12,000 to about 20,000 cps. 29. The composition according to claims 1, 3, 4 or 15 wherein the HLB of said nonionic surfactant is from about 15.0 to about 19.8 and the viscosity of said emulsion is within the range of about 14,000 to about 17,000 cps. 30. The aerosol container according to claims 16, 20 or 24 wherein the viscosity of said emulsion is from about 12,000 to about 20,000 cps. 31. The aerosol container according to claims 16, 20 or 24 wherein the HLB of said nonionic surfactant is from about 14,000 to about 17,000 cps. 32. The aerosol container according to claim 31 wherein the foamable polymer is polybutyl acrylate having a glass transition temperature of about -50° C. 33. The aerosol container according to claim 19 wherein said nonionic surfactant is a condensate of from about 15 to about 70 moles of ethylene oxide per mole of lauryl alcohol, nonylphenol or octylphenol.