# US 7,608,665 B2 · Temporary wet strength resin for paper applications > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,608,665 B2 - Document ID: US7608665B2 - Status: Granted - Kind: B2 - Application number: 11/241,565 - Filed: 2005-09-30 - Published: 2007-04-05 - Granted: 2009-10-27 - Earliest claimed: 2005-09-30 - Assignees: LANXESS Corporation - Inventors: Robert Joseph Proverb; Lucyna M. Pawlowska - Web page: https://patentgrep.com/patent/US7608665B2 ## CPC - D21H 21/20: Wet strength agents - C08F 257/02: on to polymers of styrene or alkyl-substituted styrenes - C08F 265/00: Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group C08F20/00 - C08F 265/10: on to polymers of amides or imides - C08L 33/26: Homopolymers or copolymers of acrylamide or methacrylamide - C08L 51/003: {grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds (C08L51/04, C08L51/06 take precedence)} - D21H 17/38: containing crosslinkable groups - C08L 2205/02: containing two or more polymers of the same C08L -group - D21H 17/375: {Poly(meth)acrylamide} - 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 - C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) ## Abstract A thermosetting resin comprising a reacted A) first partially crosslinked glyoxalated polymer comprising a reacted (i) first polyacrylamide backbone and (ii) a first glyoxal component; and B) a second crosslinked glyoxalated polymer comprising a reacted (i) second polyacrylamide backbone and (ii) a second glyoxyal component; such that the first polyacrylamide backbone has a molecular weight that is less than the molecular weight of the second polyacrylamide backbone; and the first polyacrylamide backbone and the second polyacrylamide backbone have a weight ratio ranging from 75:25 to 95:5. Methods for making and using the resin. Fibrous substrates made with the resin. ## Claims ### Claim 1 A thermosetting resin comprising a reaction product of: A) a first partially crosslinked glyoxalated polymer comprising a reaction product of (i) a first polyacrylamide backbone and (ii) a first glyoxal component; and B) a second crosslinked glyoxalated polymer comprising a reaction product of (i) a second polyacrylamide backbone and (ii) a second glyoxal component; wherein the first polyacrylamide backbone has a molecular weight that is less than the molecular weight of the second polyacrylamide backbone; and wherein the first polyacrylamide backbone and the second polyacrylamide backbone have a weight ratio ranging from 75:25 to 95:5. ### Claim 2 (depends on 1) The resin of claim 1, wherein the first polyacrylamide backbone and the second polyacrylamide backbone have a weight ratio ranging from 80:20 to 90:10. ### Claim 3 (depends on 1) The thermosetting resin of claim 1, wherein when the resin treats a tissue fibrous substrate, the tissue fibrous substrate exhibits a thirty minute temporary wet strength decay ranging from 60% to 80%. ### Claim 4 (depends on 1) The resin of claim 1, wherein the first polyacrylamide backbone is the polymerization product of an acrylamide monomer selected from the group consisting of (meth)acrylamide, N-methylol acrylamide, manniched acrylamide quaternarics, and combinations thereof, and, optionally, a further monomer selected from the group consisting of vinyl acetate, styrene, methyl (meth)acrylate, (meth)acrylic acid, vinyl alcohol, diallyldimethylammonium chloride, diallyldimethylammonium sulfate, vinyl pyrrolidone, (meth)acrylonitrile, dimethylaminoethyl (meth)acrylate, dimethylaminoethyl (meth)acrylate quaternaries, diethylaminoethyl (meth)acrylate, diethylaminoethyl (meth)acrylate quaternaries, hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate, (meth)acrylamidopropyltrimethylammonium chloride, succinic acid, itaconic acid, maleic acid, alkylcarboxyvinyl amine, and combinations thereof. ### Claim 5 (depends on 1) The resin of claim 1, wherein the second polyacrylamide backbone is the polymerization product of an acrylamide monomer selected from the group consisting of (meth)acrylamide, N-methylol acrylamidc, manniched acrylamide quaternarics, and combinations thereof, and, optionally, a further monomer selected from the group consisting of vinyl acetate, styrene, methyl (meth)acrylate, (meth)acrylic acid, vinyl alcohol, diallyldimethylammonium chloride, diallyldiniethylammonium sulfate, vinyl pyrrolidone, (meth)acrylonitrile, dimethylaniinoethyl (meth)acrylate, dimethylaminoethyl (meth)acrylate quaternaries, diethylaminoethyl (meth)acrylate, diethylaminoethyl (meth)acrylate quaternaries, hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate, (meth)-acrylamidopropyltrimethyl chloride, succinic acid, itaconic acid, maleic acid, alkylcarboxyvinyl amine, and combinations thereof. ### Claim 6 (depends on 1) The resin of claim 1, wherein the first polyacrylamide backbone has a weight average molecular weight ranging from 500 to 5000 daltons. ### Claim 7 (depends on 1) The resin of claim 1, wherein the first polyacrylamide backbone has a weight average molecular weight of 2000 daltons. ### Claim 8 (depends on 1) The resin of claim 1, wherein the second polyacrylamide backbone has a weight average molecular weight ranging from 6000 to 25,000 daltons. ### Claim 9 (depends on 1) The resin of claim 1, wherein the second polyacrylamide backbone has a weight average molecular weight of 12,000 daltons. ### Claim 10 (depends on 1) The resin of claim 1, wherein the resin is nonionic or ionic, and the polyacrylamide backbone or the second polyacrylamide backbone is the polymerization product of an acrylamide monomer selected from the group consisting of acrylamide, methacrylamide, and combinations thereof, and, optionally, a further monomer selected from the group consisting of acrylic acid, methacrylic acid, succinic acid, itaconic acid, and combinations thereof. ### Claim 11 (depends on 1) The resin of claim 1, wherein the resin is nonionic or ionic and the resin further comprises (i) a first partially crosslinked glyoxalated polyacrylamide backbone or (ii) the second polyacrylamide backbone further comprises non-ionic component selected from the group consisting of styrene, acrylate ester, methacrylate ester, vinyl acetate, and combination thereof. ### Claim 12 (depends on 1) The resin of claim 1, wherein the first partially crosslinked glyoxalated polyacrylamide backbone has a cationic charge. ### Claim 13 (depends on 1) The resin of claim 1, wherein second polyacrylamide backbone has a cationic charge.