Granted Patent B2

US 7,534,324 · App. 11/472,754 · Granted May 19, 2009

Abstract

Claims (8)

1. A method for inhibiting substances from filling or forming deposits on or within papermaking felts and on papermaking equipment surfaces by applying to said felt or equipment surface an effective inhibiting amount of a composition containing one or more nonionic polyoxyalkylene surfactants in which the polyoxyalkylene chains contain repeating units of both ethylene oxide (EO) and of a higher alkylene oxide (AO).

2. The method of claim 1 wherein the EO units and AO units repeat randomly or are in blocks within polyoxyalkylene chain.

3. The method of claim 1 wherein the AO repeating units have at least one C 1 -C 6 alkyl or cyclic groups pendent to the chain per AO repeating unit.

4. The method of claim 1 wherein the AD repeating units chosen from of propylene oxide (PO) or butylene oxide (BO).

5. The method of claim 1 wherein EO/AO-surfactent contains one or more EO/AO chains per molecule.

6. A method for inhibiting substances from filling or forming deposits on or within papermaking felts and on papermaking equipment surfaces by applying to said felt or equipment surface en effective inhibiting amount of a composition comprising (a) one or more anionic dispersants and/or sequestering agents and (b) one or more nonionic EO/AO-surfactants.

7. A method for Inhibiting substances from filling or forming deposits on or within papermaking felts and on papermaking equipment surfaces by applying to said felt or equipment surface an effective inhibiting amount of a composition being comprised of 1-50% ethylenediamine tetra EO/PO, copolymers 1-50% of an alcohol EO/PO and/or en EO-PO-EO block copolymer, and 0-30% of one or more anionic dispersants and/or sequestering agents, applied to the felt and/or equipment surface within an aqueous shower in which the concentration of EO/PO surfactants using the shower is from about 1ppm to about 2000ppm.

8. The method of claim 1 wherein the composition is applied to said equipment felt through equipment showers at a rate of about 0.01 to about 0.20 gallons per minute.

Assignments (28)