# US 5,700,570 A · Composite construction material > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,700,570 A - Document ID: US5700570A - Status: Granted - Kind: A - Application number: 08/599,947 - Filed: 1996-02-14 - Granted: 1997-12-23 - Earliest claimed: 1996-02-14 - Assignees: K2, Inc. - Inventors: Mohamed A. Fahmy - Web page: https://patentgrep.com/patent/US5700570A ## CPC - B32B 29/005: {next to another layer of paper or cardboard layer} - B32B 7/12: using interposed adhesives or interposed materials with bonding properties - B32B 27/10: of paper or cardboard - B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)} - B32B 29/00: Layered products comprising {a layer of} paper or cardboard - D21H 27/36: Films made from synthetic macromolecular compounds - B32B 2250/05: 5 or more layers - B32B 2307/7265: Non-permeable - B32B 2323/046: LDPE, i.e. low density polyethylene - D21H 11/04: Kraft or sulfate pulp - D21H 27/38: at least one of the sheets having a fibrous composition differing from that of other sheets - Y10T 428/277: Cellulosic substrate - Y10T 428/31895: Paper or wood - Y10T 428/31899: Addition polymer of hydrocarbon[s] only - Y10T 428/31902: Monoethylenically unsaturated - Y10T 428/31906: Ester, halide or nitrile of addition polymer - Y10T 428/31993: Of paper - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - D21H: PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A composite construction material comprises consecutive laminae of a kraft linerboard optionally coated with a sealant, a layer of polymer, a plurality of superposed layers of water-resistant paperboard adhered together, a second layer of polymer, and a second layer of kraft linerboard. ## Claims ### Claim 1 A composite construction material, comprising: a first layer of kraft linerboard, optionally having a sealant on a surface thereof; a plurality of superposed layers of water-resistant paperboard, said layers of water-resistant paperboard adhered together by means of layers of an adhesive positioned intermediate and contacting said layers of water-resistant paperboard; a first polymer layer intermediate and adhered to the first layer of kraft linerboard and the plurality of superposed layers of water-resistant paperboard; a second layer of kraft linerboard; and a second polymer layer intermediate and adhered to the second layer of kraft linerboard and the plurality of superposed layers of water-resistant paperboard. ### Claim 2 (depends on 1) The composite construction material according to claim 1, wherein the weight of the first layer of kraft linerboard is about 62 pounds per thousand per thousand feet. ### Claim 3 (depends on 2) The composite construction material according to claim 2, wherein the sealant is a water-based sealant. ### Claim 4 (depends on 1) The composite construction material according to claim 1, wherein the plurality of superposed layers of water-resistant paperboard comprises four layers of water-resistant paperboard. ### Claim 5 (depends on 1) The composite construction material according to claim 1, wherein the plurality of superposed layers of water-resistant paperboard comprises five layers of water-resistant paperboard. ### Claim 6 (depends on 1) The composite construction material according to claim 1, wherein the adhesive is a polyvinyl alcohol. ### Claim 7 (depends on 1) The composite construction material according to claim 1, wherein the first polymer layer is a low density polyethylene. ### Claim 8 (depends on 1) The composite construction material according to claim 1, wherein the first polymer layer has a weight of about 5 pounds per thousand square feet. ### Claim 9 (depends on 1) The composite construction material according to claim 1, wherein the second layer of kraft linerboard has a weight of about 62 pounds per thousand square feet. ### Claim 10 (depends on 1) The composite construction material according to claim 1, wherein the second polymer layer is a low density polyethylene. ### Claim 11 (depends on 1) The composite construction material according to claim 1, wherein the second polymer layer has a weight of about 5 pounds per thousand square feet. ### Claim 12 (depends on 1) The composite construction material according to claim 1, wherein the first and second polymer layers are the same. ### Claim 13 (depends on 1) The composite construction material according to claim 1, wherein the first and second polymers are different. ### Claim 14 A composite construction material, comprising: a first layer of kraft linerboard having a weight of about 62 pounds per thousand square feet, said first layer of kraft linerboard optionally having a water-based sealant on a surface thereof; a plurality of superposed layers of water-resistant paperboard, said layers of water-resistant paperboard adhered together by means of layers of a polyvinyl alcohol adhesive positioned intermediate and contacting said layers of water-resistant paperboard; a first layer of low density polyethylene having a weight of about 5 pounds per thousand square feet intermediate and adhered to the first layer of kraft linerboard and the plurality of superposed layers of water-resistant paperboard; a second layer of kraft linerboard having a weight of about 62 pounds per thousand square feet; and a second layer of low density polyethylene having a weight of about 5#/MSF intermediate and adhered to the second layer of kraft linerboard and the plurality of superposed layers of water-resistant paperboard. ### Claim 15 (depends on 14) The composite construction material according to claim 14, wherein the plurality of superposed layers of water-resistant paperboard comprises four layers of water resistant paperboard. ### Claim 16 (depends on 14) The composite construction material according to claim 14, wherein the plurality of superposed layers of water-resistant paperboard comprises five layers of water resistant paperboard.