US 11,939,309 B2
Low molecular weight dry powder polymer for use as paper-making dry strength agent
Heqing Huang, Naperville, IL (US); David Jordan, Evanston, IL (US); Robert M. Lowe, Chicago, IL (US); Jeffrey Cramm, Batavia, IL (US); Weiguo Cheng, Naperville, IL (US); and Mingli Wei, Naperville, IL (US)
Assigned to Ecolab USA Inc., St. Paul, MN (US)
Filed by ECOLAB USA INC., St. Paul, MN (US)
Filed on Oct. 16, 2020, as Appl. No. 17/072,573.
Application 17/072,573 is a continuation of application No. 15/620,176, filed on Jun. 12, 2017, granted, now 10,920,065.
Claims priority of provisional application 62/348,400, filed on Jun. 10, 2016.
Prior Publication US 2021/0040309 A1, Feb. 11, 2021
Int. Cl. C07D 307/04 (2006.01); C07C 219/08 (2006.01); C07C 305/04 (2006.01); C08F 220/56 (2006.01); C08G 65/00 (2006.01); C08K 5/3435 (2006.01); C08L 55/00 (2006.01); D21H 17/37 (2006.01); D21H 21/18 (2006.01); D21H 21/20 (2006.01); D21H 21/24 (2006.01); C08F 220/28 (2006.01)
CPC C07D 307/04 (2013.01) [C07C 219/08 (2013.01); C07C 305/04 (2013.01); C08F 220/56 (2013.01); C08G 65/002 (2013.01); C08K 5/3435 (2013.01); C08L 55/005 (2013.01); D21H 17/37 (2013.01); D21H 17/375 (2013.01); D21H 21/18 (2013.01); D21H 21/20 (2013.01); D21H 21/24 (2013.01); C08F 220/285 (2020.02)] 9 Claims
OG exemplary drawing
 
1. A process for making a powder, comprising:
forming the powder from a wet gel, wherein the wet gel comprises an associative polymer and optionally a surfactant, wherein the associative polymer has a weight average molecular weight of from 10 kDa to 2,000 kDa, and
wherein the associative polymer comprises a nonionic associative monomer unit derived from a monomer of Formula II:

OG Complex Work Unit Chemistry
wherein R3 is H or C1-C10 alkyl, X is O or NH, n is an integer from 1 to 100, o is an integer from 0 to 100, m is at least 5, each Y1 and Y2 are independently H or C1-C4 alkyl, and R4 is H or a hydrophobic group.