Source: http://www.patentgenius.com/patent/8227381.html
Timestamp: 2018-09-19 04:40:59
Document Index: 774026304

Matched Legal Cases: ['Application No. 06015025', 'Application No. 07014413', 'Application No. 07014412', 'Application No. 07014412', 'Application No. 09175465', 'Application No. 200710169190', 'Application No. 11158599', 'Application No. 12154675', 'Application No. 12154684']

Low molecular weight graft copolymers for scale control - Patent # 8227381 - PatentGenius
Low molecular weight graft copolymers for scale control
8227381 Low molecular weight graft copolymers for scale control
Application: 12/888,618
Inventors: Rodrigues; Klin A. (Signal Mountain, TN)
Sanders; Jannifer (Hixson, TN)
U.S. Class: 507/90; 166/305.1; 507/211; 507/221; 507/224; 510/434; 510/471; 510/476; 510/477; 510/505; 525/7
Field Of Search: 507/90; 507/211; 507/221; 507/224; 166/305.1; 510/434; 510/471; 510/476; 510/477; 510/505; 525/7
International Class: C09K 8/52; C09K 8/68; C09K 8/528; C11D 3/37; C11D 3/22
Foreign Patent Documents: 2074747; 1087649; 101830015; 101863540; 102146150; 40 38 908; 0 130 756; 0 404 377; 0 405 917; 00438215; 0 441 197; 0 526 800; 0 577 519; 0 605 084; 0 725 131; 1 007 529; 1 236 748; 1 022 294; 1 881 017; 1950232; 2 072 531; 2 138 560; 2 908 135; 2 927 083; 1137741; 6-298866; 11-343449; 2005-120045; 2010-47713; 2011-195809; WO 91/06637; WO 92/06162; WO 92/10433; WO 93/02118; WO 93/11214; WO 93/19038; WO 93/19146; WO 94/09099; WO 95/10591; WO 95/26393; WO 98/35002; WO 98/35003; WO 98/35004; WO 98/35005; WO 98/35006; WO 99/02663; WO 99/05082; WO 99/05084; WO 99/05241; WO 99/05242; WO 99/05243; WO 99/05244; WO 99/07656; WO 99/20726; WO 99/27083; WO 00/23548; WO 00/23549; WO 00/47708; WO 01/32816; WO 01/42408; WO 03/042262; WO 2005/012378; WO 2005/059023; WO 2006/026406; WO 2008/089262; WO 2010/144575; WO 2011/008272; WO 2011/014783; WO 2011/017223; WO 2011/025624; WO 2011/044490; WO 2011/135313; WO 2012/000609
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Abstract: Low molecular weight graft copolymer comprising a synthetic component formed from at least one or more olefinically unsaturated carboxylic acid monomers or salts thereof, and a natural component formed from a hydroxyl-containing natural moiety. The number average molecular weight of the graft copolymer is about 100,000 or less, and the weight percent of the natural component in the graft copolymer is about 50 wt % or greater based on total weight of the graft copolymer. Processes for preparing such graft copolymers are also disclosed.
1. A method of controlling scale in an aqueous system comprising adding a low molecular weight graft copolymer composition to the aqueous system in an amount sufficient to inhibitscale formation, said graft copolymer produced by free radical copolymerization of components comprising: a synthetic component formed from at least one or more olefinically unsaturated carboxylic acid monomers or salts thereof, and a natural componentformed from a hydroxyl-containing natural moiety selected from the group consisting of maltodextrin, corn syrup solids, and mixtures thereof, wherein the number average molecular weight of the graft copolymer is about 100,000 or less, and the weightpercent of the natural component in the graft copolymer is about 50 wt % or greater based on total weight of the graft copolymer.
2. The method of controlling scale in aqueous systems according to claim 1 wherein the composition is effective to inhibit formation of scale formed by calcium carbonate, halite, silicates, calcium phosphate, calcium sulfate, barium sulfate,strontium sulfate, iron sulfide, lead sulfide, zinc sulfide or mixtures thereof.
7. The method of controlling scale in aqueous systems according to claim 3 further comprising adding the low molecular weight graft copolymer topside to production water, and re-injecting the production water into the oil-bearing rock formationmatrix.
14. The method of claim 1 wherein the synthetic component is further formed from one or more monomers having a nonionic, hydrophobic and/or sulfonic acid group, wherein the one or more monomers are incorporated into the copolymer in an amountof about 50 weight percent or less based on total weight of the graft copolymer.
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