# US 11,028,539 B2 · Soft high basis weight tissue > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,028,539 B2 - Document ID: US11028539B2 - Status: Granted - Kind: B2 - Application number: 16/845,668 - Filed: 2020-04-10 - Published: 2020-07-30 - Granted: 2021-06-08 - Earliest claimed: 2018-04-30 - Assignees: Kimberly-Clark Worldwide, Inc. - Applicants: Kimberly-Clark Worldwide, Inc. - Inventors: Oriol Margo Moreno; John Alexander Werner, IV; Steven J. Hickey; Paul David Bradford; Cristiano Bobba; Giovanni Massarotti - Web page: https://patentgrep.com/patent/US11028539B2 ## CPC - D21H 27/005: {relating to physical or mechanical properties, e.g. tensile strength, stretch, softness} - B31F 1/126: {including making of the paper to be crêped} - D21F 11/14: Making cellulose wadding, filter or blotting paper - D21H 5/00: {Special paper or cardboard not otherwise provided for (duplicating or recording paper B41M)} - D21H 17/20: Macromolecular organic compounds - D21H 21/146: {Crêping adhesives} - D21H 27/002: {Tissue paper; Absorbent paper (D21H21/22, D21H27/02, D21H27/20 take precedence; toilet paper A47K10/00; absorbent pads for physiological fluids A61L15/16; making on paper-making machines D21F11/00)} - D21H 27/40: at least one of the sheets being non-planar, e.g. crêped (crêping or corrugating paper B31F) - 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 - B31F: MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER (making layered products not composed wholly of paper or cardboard B32B) - D21F: PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON ## Abstract The present invention provides multi-ply creped tissue products, and in particular embodiments creped wet pressed tissue products, having substantially higher per-ply basis weights, such as from about 20 to about 30 gsm, without the negative effects often associated with higher basis weight. As such, the tissue products are generally soft and flexible, having a softness value (measured as TS7) less than about 12.0 and a Stiffness Index less than about 20. While being soft and flexible, the instant tissue products are durable enough to withstand use, such as having a GMT greater than about 600 g/3″ and a Burst Index greater than about 12.0. ## Claims ### Claim 1 A creped wet pressed tissue product comprising a first creped wet pressed tissue ply having a basis weight greater than 20 grams per square meter (gsm) and a second creped wet pressed tissue ply having a basis weight greater than 20 gsm, wherein the tissue product has a geometric mean tensile (GMT) from about 600 to about 1,000 g/3″ and a Stiffness Index less than about 20. ### Claim 2 (depends on 1) The creped wet pressed tissue product of claim 1 wherein the first and the second creped wet pressed tissue plies each have an outer surface and a conventional creping composition comprising at least one water soluble polymer selected from the group consisting of polyamidoamine-epichlorohydrin resin, polyamine-epichlorohydrin resin, polyvinyl alcohol, polyvinylamine, polyethyleneimine, polyacrylamide, polymethacrylamide, poly(acryiic acid), poly(methacrylic acid), poly(hydroxyethyl acrylate), poly(hydroxyethyl methacrylate), poly(n-vinyl pyrrolidinone), poly(ethylene oxide), hydroxyethyl cellulose, hydroxypropyl cellulose, guar gum, starch, agar, chitosan, alginic acid, and carboxymethyl cellulose disposed thereon. ### Claim 3 (depends on 1) The creped wet pressed tissue product of claim 1 wherein the tissue product has a GMT from about 700 to about 900 g/3″ and a Stiffness Index from about 10.0 to about 20.0. ### Claim 4 (depends on 1) The creped wet pressed tissue product of claim 1 wherein the tissue product has a GMT from about 700 to about 900 g/3″ and a geometric mean slope (GM Slope) from about 10.0 to about 15.0 kg. ### Claim 5 (depends on 1) The creped wet pressed tissue product of claim 1 wherein the tissue product has a TS7 value less than about 12.0. ### Claim 6 (depends on 1) The creped wet pressed tissue product of claim 1 wherein the tissue product has a TS7 value less than about 10.0. ### Claim 7 (depends on 1) The creped wet pressed tissue product of claim 1 wherein the tissue product has a basis weight from about 42 to about 50 gsm and a TS7 value less than about 10.0. ### Claim 8 (depends on 1) The creped wet pressed tissue product of claim 1 wherein the tissue product has a GMT from about 700 to about 900 g/3″, a geometric mean slope (GM Slope) from about 10.0 to about 15.0 kg and a TS7 value less than about 10.0. ### Claim 9 (depends on 1) The creped wet pressed tissue product of claim 1 wherein the first and the second creped wet pressed tissue plies each have a basis weight from about 22.0 to about 25.0 gsm. ### Claim 10 (depends on 1) The creped wet pressed tissue product of claim 1 wherein the tissue product has a basis weight from about 40 to about 60 gsm. ### Claim 11 (depends on 1) The creped wet pressed tissue product of claim 1 wherein the tissue product has a basis weight from about 42 to about 50 gsm. ### Claim 12 (depends on 1) The creped wet pressed tissue product of claim 1 wherein the tissue product has a basis weight from about 40 to about 60 gsm, a GMT from about 600 to about 1,000 g/3″ and a Stiffness Index from about 10.0 to about 20.0. ### Claim 13 (depends on 1) The creped wet pressed tissue product of claim 1 wherein the first and the second creped wet pressed tissue plies each comprise a first and second layer, the first layer comprising hardwood pulp fibers and the second layer comprising softwood pulp fibers. ### Claim 14 (depends on 13) The creped wet pressed tissue product of claim 13 wherein the first and the second creped wet pressed tissue plies comprise about 60 percent or greater, by weight of the ply, hardwood pulp fibers and about 40 percent or less, by weight of the ply, softwood pulp fibers. ### Claim 15 (depends on 14) The creped wet pressed tissue product of claim 14 wherein the first and the second creped wet pressed tissue plies each have an outer surface and a conventional creping composition comprising at least one water soluble polymer selected from the group consisting of polyamidoamine-epichlorohydrin resin, polyamine-epichlorohydrin resin, polyvinyl alcohol, polyvinylamine, polyethyleneimine, polyacrylamide, polymethacrylamide, poly(acryiic acid), poly(methacrylic acid), poly(hydroxyethyl acrylate), poly(hydroxyethyl methacrylate), poly(n-vinyl pyrrolidinone), poly(ethylene oxide), hydroxyethyl cellulose, hydroxypropyl cellulose, guar gum, starch, agar, chitosan, alginic acid, and carboxymethyl cellulose disposed thereon. ### Claim 16 (depends on 15) The creped wet pressed tissue product of claim 15 wherein the tissue product has a GMT from about 700 to about 900 g/3″ and a geometric mean slope (GM Slope) from about 10.0 to about 15.0 kg. ### Claim 17 (depends on 16) The creped wet pressed tissue product of claim 16 wherein the tissue product has a TS7 value less than about 10.0.