# US 5,348,785 A · Method for manufacturing a carpet having a secondary backing substantially impervious to aqueous solutions and the resultant carpet > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,348,785 A - Document ID: US5348785A - Status: Granted - Kind: A - Application number: 08/178,992 - Filed: 1994-01-07 - Granted: 1994-09-20 - Earliest claimed: 1994-01-07 - Assignees: E. I. Du Pont de Nemours and Company - Inventors: Yashavant V. Vinod - Web page: https://patentgrep.com/patent/US5348785A ## CPC - B32B 38/00: Ancillary operations in connection with laminating processes - D06N 7/0073: {the back coating or pre-coat being applied as an aqueous dispersion or latex} - D06N 7/0076: {the back coating or pre-coat being a thermoplastic material applied by, e.g. extrusion coating, powder coating or laminating a thermoplastic film} - D06N 2201/0263: Polyamide fibres - D06N 2203/044: Fluoropolymers - D06N 2205/04: Foam - D06N 2205/20: Cured materials, e.g. vulcanised, cross-linked - D06N 2209/128: Non-permeable - Y10T 428/23979: Particular backing structure or composition - Y10T 428/23986: With coating, impregnation, or bond - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - D06N: WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract This invention relates to methods for making a carpet having a secondary backing which is substantially impervious to aqueous solutions. The process involves applying a fluorochemical onto the underside of a secondary backing material, followed by drying and curing of the fluorochemical. This invention also includes the resultant carpets prepared from such a process. ## Claims ### Claim 1 A method for constructing a carpet having a secondary backing which is substantially impervious to aqueous solutions, comprising the steps of: a) forming a carpet comprising a primary backing having a surface with projecting tufts of yarn and an underside and a secondary backing, said secondary backing having a surface and an underside, wherein the underside of the primary backing is adhered to the surface of the secondary backing; b) applying a fluorochemical onto the underside of the secondary backing; and c) drying and curing the fluorochemical to render the secondary backing substantially impervious to aqueous solutions. ### Claim 2 (depends on 1) The method of claim 1, wherein the tufts of yarn are polyamide yarns. ### Claim 3 (depends on 1) The method of claim 1, wherein the fluorochemical is applied onto the underside of the secondary backing as a fluorochemical solution containing 5 to 40% by weight fluorochemical, said solution being applied in an amount of 0.05 to 1.0 ounces per square yard of secondary backing. ### Claim 4 (depends on 1) The method of claim 1, wherein the fluorochemical is dried and cured by heating the carpet having the secondary backing at a temperature in the range of 250.degree. to 400.degree. F. ### Claim 5 (depends on 1) The method of claim 1, wherein the fluorochemical is dried and cured at room temperature. ### Claim 6 A method for constructing a carpet having a secondary backing which is substantially impervious to aqueous solutions, comprising the steps of: a) applying a fluorochemical onto a secondary backing having a surface and an opposing underside, wherein the fluorochemical is applied to the underside of the secondary backing; and b) contacting the surface of the secondary backing with a primary backing having tufts of yarn projecting from its surface and an adhesive-coated underside to form a carpet having a secondary backing which is substantially impervious to aqueous solutions. ### Claim 7 A method for making a carpet having a secondary backing substantially impervious to aqueous solutions, comprising adhering a tufted primary backing to a secondary backing having a surface and opposing underside, wherein a sufficient amount of fluorochemical is cured onto the surface of the underside to render the secondary backing substantially impervious to aqueous solutions. ### Claim 8 A method for rendering a secondary backing of a carpet comprising a tufted primary backing and secondary backing substantially impervious to aqueous solutions, comprising applying a sufficient amount of fluorochemical onto the underside of the secondary backing to render the secondary backing substantially impervious to aqueous solutions. ### Claim 9 A tufted pile carpet having a secondary backing substantially impervious to aqueous solutions, comprising: a) a primary backing having a surface tufted with pile yarns and an underside; and b) a secondary backing having a surface and an underside, wherein the surface of the secondary backing is adhered to the underside of the primary backing, and the underside of the secondary backing is coated with a sufficient amount of fluorochemical to render the secondary backing substantially impervious to aqueous solutions. ### Claim 10 (depends on 9) The carpet of claim 9, wherein the pile yarns are polyamide yarns.