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US 11,939,309 B2Granted
Low molecular weight dry powder polymer for use as paper-making dry strength agent
AssigneeEcolab USA Inc.
InventorsHeqing Huang, David Jordan, Robert M. Lowe, Jeffrey Cramm, Weiguo Cheng, Mingli Wei
Life of this patent
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Abstract
The invention provides an associative polymer, a powder, and a process for making a powder including, networking one or more associative polymers and one or more optional surfactants to form a wet gel, and forming a powder from the wet gel, wherein the associative polymer(s) have a weight average molecular weight of from about 10 kDa to about 2,000 kDa.
Claims9
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:
- 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.
Dependencies are inferred from the claim text.