Aldehyde-functionalized polymers
AssigneeNalco Company
InventorsMichael R. St. John, Angela P. Zagala
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Abstract
A composition for enhancing the dewatering of a paper sheet on a paper machine and a method for using the composition is disclosed. The composition comprising one or more aldehyde-functionalized polymers comprising amino or amido groups wherein at least about 15 mole percent of the amino or amido groups are functionalized by reacting with one or more aldehydes and wherein the aldehyde functionalized polymers have a molecular weight of at least about 100,000. The method comprising adding the composition to the paper machine at a dosage of about 0.05 lb/ton to about 15 lb/ton, based on dry fiber.
Claims53
A composition comprising:
- (i) one or more aldehyde-functionalized polymers comprising amino and/or amido groups wherein at least about 15 mole percent of the amino and/or amido groups are functionalized by reacting with one or more aldehydes and (ii) at least about 60 70 to 80 mole percent of the one or more aldehydes remain unreacted, wherein the amount of unreacted aldehyde is based on an amount used to functionalize the amino or amido groups.
The method of claim 25 24, further comprising adding said composition to (i) wet end locations used for conventional wet end additives and/or (ii) at or prior to the press section.
A composition comprising one or more aldehyde-functionalized polymers comprising amino and/or amido groups, the amino and/or amido groups are functionalized by reacting with one or more aldehydes with the initial molar ratio of the aldehydes to amino and/or amido groups being 0.8 to 1.0, wherein at least about 70 to 80 mole percent of the one or more aldehydes remain unreacted and the amount of unreacted aldehyde is based on an amount used to functionalize the amino or amido groups.
A composition comprising:
- (i) one or more aldehyde-functionalized polymers comprising amino and/or amido groups wherein from 22 mole percent to 30 mole percent of the amino and/or amido groups are functionalized by reacting with one or more aldehydes and (ii) at least about 70 to 80 mole percent of the one or more aldehydes remain unreacted, wherein the amount of unreacted aldehyde is based on an amount used to functionalize the amino or amido groups.
Dependencies are inferred from the claim text.