Foams for filling cavities and crevasses and for forming foamed products are provided. The latex foam may include an A-side containing a functionalized latex and a B-side that contains a crosslinking agent and optionally a non-functionalized latex. The A- and/or B-side contain a blowing agent packag
Foams for filling cavities and crevasses and for forming foamed products are provided. The latex foam may include an A-side containing a functionalized latex and a B-side that contains a crosslinking agent and optionally a non-functionalized latex. The A- and/or B-side contain a blowing agent package or components forming the blowing agent package. The blowing agent package may be the combination of two or more chemicals that when mixed together form a gas or a chemical compound that, when activated by heat or light, forms a gas. In an alternate embodiment, the latex foam includes a functionalized latex, an acid, and an encapsulated crosslinking agent and base. Alternatively, the spray latex foam may include a functionalized latex, a crosslinking agent, and an encapsulated dry acid and dry base. The encapsulating agent may be a protective, non-reactive shell that can be broken or melted at the time of application.
대표청구항▼
1. A two-part foamable spray composition for forming an insulative foam, the composition comprising: a first component including: (1) a carboxylated acrylic latex, with or without an acrylic solution, the carboxylated acrylic latex present in an amount of 90 to 95% by weight of the first component,
1. A two-part foamable spray composition for forming an insulative foam, the composition comprising: a first component including: (1) a carboxylated acrylic latex, with or without an acrylic solution, the carboxylated acrylic latex present in an amount of 90 to 95% by weight of the first component, and (2) an acid of an acid-base blowing agent package; anda second component including: (1) a base of the acid-base blowing agent package, (2) a plasticizer, and (3) a polyfunctional aziridine that crosslinks at or about room temperature, the polyfunctional aziridine present in an amount of 2.7% to 30% by weight of the second component;wherein the polyfunctional aziridine is the only crosslinking agent in the composition;wherein a molar ratio of carboxy functional groups of the carboxylated acrylic latex to aziridine functional groups of the polyfunctional aziridine is 0.5:1 to 2:1;wherein upon mixing the first component with the second component a reaction of the acid and the base is operable to generate a gas simultaneously with crosslinking of the first component and the polyfunctional aziridine crosslinking agent to form the insulative foam, the insulative foam hardening to achieve an R-value of 3.5° Fft2h/BTU per inch to 8° Fft2h/BTU per inch within two minutes after the first component is contacted with the second component, andwherein the insulative foam has a density of 0.5 to 5 pounds per cubic foot. 2. The two-part foamable spray composition of claim 1, wherein the foam is able to withstand the force of gravity when applied to a vertical surface. 3. The two-part foamable spray composition of claim 1, wherein the second component further comprises a non-functionalized latex. 4. The two-part foamable spray composition of claim 1, wherein at least one of the first component and the second component further includes an alcohol co-solvent. 5. The two-part foamable spray composition of claim 1, wherein the carboxylated acrylic latex contains from about 1.0 to about 50.0 wt % the carboxy functional groups based on the total weight of the carboxylated acrylic latex. 6. The two-part foamable spray composition of claim 1, wherein at least one of the first component and the second component further comprises at least one of a surfactant and a thickening agent. 7. The two-part foamable spray composition of claim 1, wherein the two-part foamable composition forms a non-structural foam. 8. The two-part foamable spray composition of claim 1, wherein the first component includes acrylic acid. 9. The two-part foamable spray composition of claim 1, wherein the acid is selected from the group consisting of: citric acid, oxalic acid, tartaric acid, succinic acid, fumaric acid, adipic acid, maleic acid, malonic acid, glutaric acid, phthalic acid, metaphosphoric acid, and salts that are convertible into these acids. 10. The two-part foamable spray composition of claim 1, wherein the base is selected from the group consisting of: calcium carbonate, magnesium carbonate, lithium carbonate, sodium carbonate, potassium carbonate, calcium hydrogen carbonate, magnesium hydrogen carbonate, lithium hydrogen carbonate, sodium hydrogen carbonate (sodium bicarbonate), potassium hydrogen carbonate (potassium bicarbonate) and combinations thereof. 11. The two-part foamable spray of claim 1, wherein the acid is a dry acid powder.
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