# US 4,392,917 A · Amphoteric water-in-oil self-inverting polymer emulsion > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,392,917 A - Document ID: US4392917A - Status: Granted - Kind: A - Application number: 06/308,175 - Filed: 1981-10-05 - Granted: 1983-07-12 - Earliest claimed: 1979-10-15 - Assignees: Diamond Shamrock Corporation - Inventors: Stanley A. Lipowski; John J. Miskel, Jr. - Web page: https://patentgrep.com/patent/US4392917A ## CPC - D21H 17/44: cationic - C02F 1/54: using organic material - C09K 8/035: Organic additives - C09K 8/588: characterised by the use of specific polymers {(polymeric surfactants C09K8/584)} - D21H 17/42: anionic - Y10S 507/936: Flooding the formation - 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 - C02F: TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes) - C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE - Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS ## Abstract An amphoteric water-in-oil self-inverting polymer emulsion is prepared which contains a copolymer of (1) a nonionic vinyl monomer and (2) an amphoteric vinyl monomer or a terpolymer of (1) a nonionic vinyl monomer, (2) an anionic vinyl monomer and (3) a cationic vinyl monomer in the aqueous phase, a hydrocarbon oil for the oil phase, a water-in-oil emulsifying agent and an inverting surfactant. An example of a copolymer is a copolymer of (1) a nonionic vinyl monomer such as acrylamide or methacrylamide and (2) an amphoteric vinyl monomer such as a reaction product of dimethylaminoethyl methacrylate and monochloroacetic acid. An example of a terpolymer is a terpolymer of (1) a nonionic vinyl monomer such as acrylamide or methacrylamide, (2) an anionic vinyl monomer such as sodium acrylate and (3) a cationic vinyl monomer such as a triethyl ammonium ethyl methacrylate methosulfate salt. The emulsion is useful in papermaking, treatment of sewage and industrial wastes, drilling muds and secondary and tertiary recovery of petroleum by water flooding. ## Claims ### Claim 1 In pulp and papermaking processes, the improvement which comprises adding to pulp an effective amount of an amphoteric water-in-oil self-inverting polymer emulsion having (a) from about 10 to about 50 parts by weight of a polymer selected from the group consisting of (1) a copolymer having from about 30 to about 99 parts by weight of a water soluble nonionic vinyl monomer and from about 1 to about 70 parts by weight of a water soluble amphoteric vinyl monomer, and (2) a terpolymer having from about 30 to 98 parts by weight of a water soluble nonionic vinyl monomer, from about 1 to about 35 parts by weight of a water soluble anionic vinyl monomer and from about 1 to about 35 parts by weight of a water soluble cationic vinyl monomer, (b) from about 10 to about 50 parts by weight of water, (c) from about 5 to about 50 parts by weight of a hydrophobic liquid, (d) from about 2 to about 25 parts by weight of a water-in-oil emulsifying agent, and (e) from about 1 to about 15 parts by weight of an inverting surfactant wherein the polymer is in the aqueous phase to improve drainage of the pulp. ### Claim 2 (depends on 1) The process of claim 1 wherein there is added to the pulp from about 0.005% to about 0.5% by weight of the emulsion based on the weight of the dry pulp. ### Claim 3 (depends on 1) The process of claim 1 wherein there is present in the polymer, a water soluble nonionic vinyl monomer selected from the group consisting of acrylamide, methacrylamide, allyl alcohol, 3-methylallyl alcohol, vinyl chloride, vinyl methyl ether and vinyl ethyl ether. ### Claim 4 (depends on 1) The process of claim 1 wherein there is present in the polymer, a water soluble nonionic vinyl monomer selected from the group consisting of acrylamide and methacrylamide. ### Claim 5 (depends on 1) The process of claim 1 wherein there is present in the polymer, a water soluble cationic vinyl monomer selected from the group consisting of N-substituted-(N'-dialkylaminoalkyl)acrylamide, aminoalkylacrylate, dialkylaminoalkylacrylate, vinylpyridine, diallylalkylamine and quaternary having at least one ethylenically unsaturated substituent. ### Claim 6 (depends on 1) The process of claim 1 wherein there is present in the polymer, a water soluble cationic vinyl monomer selected from the group consisting of N-substituted-(N'-dialkylaminoalkyl)acrylamide and aminoalkylacrylate. ### Claim 7 (depends on 1) The process of claim 1 wherein there is present in the polymer, a water soluble anionic vinyl monomer selected from the group consisting of acrylic acid, 1,2-dichloroacrylic acid, 2-methylacrylic acid, ethylene sulfonic acid, fumaric acid, chlorofumaric acid, methylfumaric acid, itaconic acid, maleic acid, dichloromaleic acid, methylmaleic acid, methacrylic acid, styrene sulfonic acid, crotonic acid and salt thereof. ### Claim 8 (depends on 1) The process of claim 1 wherein there is present in the polymer, an amphoteric water soluble vinyl monomer which is a reaction product of a cationic water soluble vinyl monomer selected from the group consisting of N-substituted-(N'-dialkylaminoalkyl)acrylamide, aminoalkylacrylate, dialkylaminoalkylacrylate, vinylpyridine, diallylalkylamine and a quaternary having at least one ethylenically unsaturated substituent with an anionic reactant selected from the group consisting of chloroacetic acid, chlorosulfonic acid and bromoethanol sulfonic acid. ### Claim 9 (depends on 1) The process of claim 1 wherein the polymer is a copolymer of acrylamide and an amphoteric vinyl monomeric reaction product of dimethylaminoethyl methacrylate and monochloroacetic acid. ### Claim 10 (depends on 1) The process of claim 1 wherein the polymer is a terpolymer of acrylamide, acrylic acid and a quaternization vinyl monomeric reaction product of dimethylaminoethyl methacrylate and dimethyl sulfate.