Patent ID: 9714331
Date: 2017-07-25
CPC Classifications: C08J,C08L,E04B,E04C

Claim:
1. A method of forming an elastomeric foam for sealing a building, insulating a building, or both, the method comprising: a) delivering a first component of a foamable composition including an acid from an acid-base blowing agent package and 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 through a first delivery line to an application device; b) delivering a second component of a foamable composition including a base from the acid-base blowing agent package, a plasticizer, and a polyfunctional aziridine present in an amount of 2.7% to 30% by weight of the second component through a second delivery line to said application device; c) mixing the first component and the second component within the application device to form a foamable reaction mixture by permitting the polyfunctional aziridine and the carboxylated acrylic latex to chemically react while the acid from the acid-base blowing agent package reacts with the base from the acid-base blowing agent package and initiates a foaming reaction and forms the elastomeric foam; and d) applying the foamable reaction mixture to a desired surface of the building; wherein one or both of the first component and the second component includes a tackifier; wherein the foam hardens to achieve an R-value of 3.5° Fft wherein the polyfunctional aziridine is the only crosslinking agent in the foamable composition; wherein a molar ratio of carboxy functional groups of the latex to aziridine functional groups of the polyfunctional aziridine is 0.5:1 to 2:1; wherein the elastomeric foam has a density of 0.5 to 5 pounds per cubic foot; and wherein the elastomeric foam and the foamable reaction mixture are free of isocyanate.