Daniel A Barnett

US Patent:

56328605, May 27, 1997

Filed:

Jul 5, 1995

Appl. No.:

8/498326

Inventors:

William A. Hendriks - Jacksonville FL
Daniel J. Barnett - Jacksonville FL

Assignee:

BetzDearborn Inc. - Trevose PA

International Classification:

D21H 2112
D21H 1706
B01D 1904

US Classification:

162177

Abstract:

A method for controlling foam in the papermaking operation comprising a polyether surfactant and polyethoxylated sorbitol hexaoleate.

US Patent:

48614297, Aug 29, 1989

Filed:

Jul 29, 1988

Appl. No.:

7/225978

Inventors:

Daniel J. Barnett - Jacksonville FL
Daniel L. Michalopoulos - Jacksonville FL

Assignee:

Betz Laboratories, Inc. - Trevose PA

International Classification:

D21F 132

US Classification:

162199

Abstract:

This invention relates to a process for inhibiting white pitch deposition in felts of a papermaking system including adding to the felts an effective inhibiting amount of an organic, anionic polyelectrolyte. The molecular weight of the polyelectrolyte is preferably from about 1,000 to 100,000. The polyelectrolyte is selected from the group consisting of polyacrylic acid, polmethacrylic acid, acrylic acid/polyethylene glycol allyl ether copolymers, methacrylic acid/polyethylene glycol allyl ether copolymers, acrylic acid/1-allyloxy-2-hydroxypropane sulfonic acid copolymers. The use of these polyelectrolytes in combination with surfactants provides an especially effective white pitch inhibiting and total felt conditioning process when applied to the felt.

US Patent:

48956228, Jan 23, 1990

Filed:

Nov 9, 1988

Appl. No.:

7/269218

Inventors:

Daniel J. Barnett - Jacksonville FL
Abdul Q. Khan - Jacksonville FL
Patricia R. Keen - Jacksonville FL

Assignee:

Betz Laboratories, Inc. - Trevose PA

International Classification:

D21F 132

US Classification:

162199

Abstract:

This invention relates to an improved press felt conditioning treatment which controls the deposition of polymerically flocculated particulate substances in a press felt. The treatment comprises applying to the felt an effective inhibiting amount of a conditioner comprising a relatively low molecular weight organic, anionic polymer and at least one hydrophilic, nonionic or anionic surfactant. The polymer preferrably has an acrylic acid or methacrylic acid functionality and is preferrably selected from the group consisting of homopolymers of acrylic acid, a methacrylic acid/polyethylene glycol allyl ether copolymer, a homopolymer of methacrylic acid, an acrylic acid/polyethylene glycol allyl ether copolymer, and an acrylic acid/1-allyloxy-2-hydroxypropane sulfonic acid copolymer. The surfactant is preferrably selected from the group consisting of octyl phenol ethoxylate, nonyl phenol ethoxylate, dodecyl phenol ethoxylate, secondary alcohol ethoxylate, ethoxylated polyoxypropylene glycol, dialkyl phenol ethoxylate, alkyl polyglycoside, dodecylbenzene sulfonic acid and polyoxyethyelene sorbitan monoester. The use of a relatively low molecular weight polymer having an acrylic acid or methacrylic acid functionality in combination with at least one hydrophilic, nonionic or anionic surfactant is especially effective at preventing the deposition of polymerically flocculated particulate substances in a press felt and papermaking machine.

US Patent:

47159316, Dec 29, 1987

Filed:

Mar 24, 1987

Appl. No.:

7/029827

Inventors:

Alan J. Schellhamer - Jacksonville FL
Daniel J. Barnett - Jacksonville FL
Abdul Q. Khan - Jacksonville FL

Assignee:

Betz Laboratories, Inc. - Trevose PA

International Classification:

D21F 132

US Classification:

162199

Abstract:

This invention relates to process for inhibiting deposition of aluminum hydroxide in felts of a papermaking system which comprises adding to the felts an effective inhibiting amount of a hydroxylated carboxylic acid having at least 1 hydroxyl group and at least 2 carboxyl groups. The molecular weight of the carboxylic acid is from about 100 to about 200 and, preferably, the carboxylic acid is selected from the group consisting of tartaric acid, malic acid, citric acid, mesoxalic acid, tartronic acid and tetrahydroxy succinic acid. The use of these carboxylic acids in combination with surfactants provides an especially effective aluminum hydroxide inhibiting and total felt conditioning process when both components are applied to the felt.