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US 12,747,307 B2Granted
Method of preparing aldehyde-functionalized polymers
AssigneeEcolab USA Inc.
InventorsHerman Mark Grimm, Mei Liu, David Jordan, Nathan Jones
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Abstract
A method is provided for generating aldehyde-functionalized polymers such as GPAM, wherein progress of the aldehyde-functionalized polymer formation is monitored by measuring viscosity using an online viscometer. A method is also provided for enhancing paper strength, said method comprising generating an aldehyde-functionalized polymer, such as GPAM, according to the present disclosure, and combining said aldehyde-functionalized polymer with a fiber slurry or applying it to a paper sheet.
Claims12
A method of making GPAM onsite, said method comprising:
- (a) combining at least a polyacrylamide and glyoxal to obtain a reaction solution;
- and
- (b) quenching the reaction by adjusting the pH of the reaction solution to a value in a range from about 2 to about 6 to obtain said GPAM;
- wherein said GPAM has a weight average molecular weight of from about 200,000 g/mole to 3,000,000 g/mole;
- and
- wherein progress of the reaction is monitored by measuring the viscosity of the reaction solution using an online viscometer;
- wherein said viscometer provides continuous real time viscosity measurements via a feedback loop
- wherein said GPAM has a glyoxal to acrylamide (G/A ratio) of about 0.05:1 to about 20:1.
5 more elements
Dependencies are inferred from the claim text.