US 11,866,677 B2
Copolymer formulations of poly (itaconic acid-co-2-acrylamido-2-methylpropane sulfonic acid) for dishwasher detergent compositions
James William Gordon, Cumbria (GB); Bo Jiang, Brentwood, NH (US); Yvon Durant, Lee, NH (US); and John Shaw, Hampton Falls, NH (US)
Assigned to ITACONIX CORPORATION, Stratham, NH (US)
Filed by Itaconix Corporation, Stratham, NH (US)
Filed on Feb. 3, 2021, as Appl. No. 17/248,705.
Claims priority of provisional application 62/970,500, filed on Feb. 5, 2020.
Prior Publication US 2021/0238503 A1, Aug. 5, 2021
Int. Cl. C11D 3/37 (2006.01); C11D 7/26 (2006.01); C08F 222/02 (2006.01); C11D 17/04 (2006.01); C11D 11/00 (2006.01)
CPC C11D 3/378 (2013.01) [C08F 222/02 (2013.01); C11D 3/3761 (2013.01); C11D 3/3765 (2013.01); C11D 11/0023 (2013.01); C11D 17/042 (2013.01); C11D 17/043 (2013.01); C08F 2800/20 (2013.01)] 17 Claims
 
1. A dishwasher detergent formulation comprising:
(a) a first copolymer A having the following structure:

OG Complex Work Unit Chemistry
where R1 is a hydrogen, or a —CH3, —CH2CH3, —CH2CH2CH3 group;
X, Y and Z are either hydrogen or Na+, Li+, K+ and/or NH4+ and can be the same or different;
R2 is an amido group (—CONH—) to provide acrylamide-alkyl sulfonic acid functionality (—CONH—R3—SO3X) wherein R3 is a —CH2—, —CH2CH2—, —CH2—CH2—CH2—, —C—(CH3)2 or —C—(CH3)2—CH2— group;
wherein the weight percent of repeat unit “a” in said copolymer is present at a level of 55.0 wt. % to 79.0 wt. % and the weight percent of repeat unit “b” in said copolymer is present at a level of 45.0 wt. % to 21.0 wt. % and wherein copolymer A has a number average molecular weight (Mn) from 1000 to 4500 grams per mole;
(b) a second polymeric ingredient B selected from one or more of the following:
(1) a homopolymer or copolymer of poly(acrylic acid);
(2) a homopolymer or copolymer of a poly(alkylacrylic acid);
(3) poly(aspartic acid); or
(4) poly(carboxy methyl inulin); and
wherein said dishwasher formulation 3.0% by weight to 12.0% by weight copolymer A and up to and including 0.9% by weight of said second polymeric ingredient B.