Randall Edward Nelson

US Patent:

6447644, Sep 10, 2002

Filed:

Oct 10, 2001

Appl. No.:

09/974382

Inventors:

Raymond R. Seltzer - New City NY
Jean-Pierre Wolf - Courtaman, CH
Cyril Heitner - Pierrefonds, CA
John A. Schmidt - Lile Bizard, CA
Peter F. McGarry - Lile Bizard, CA
Glen T. Cunkle - Stamford CT
Randall B. Nelson - Seattle WA

Assignee:

Ciba Specialty Chemicals Corporation - Tarrytown NY

International Classification:

D21F 1100

US Classification:

162158, 162 70, 162 71, 162 76, 162 77, 162 81, 162160, 162162, 1621646, 1621647, 162165, 162166, 162167

Abstract:

Pulps or papers, especially chemimechanical or thermomechanical pulps or papers, which still contain lignin, have enhanced resistance to yellowing when they contain an effective stabilizing amount of a hindered amine compound which preferably is a nitroxide, a hydroxylamine or an ammonium salt thereof. This performance is often further enhanced by the presence of one or more coadditives selected from the group consisting of the UV absorbers, the polymeric inhibitors, the nitrones, the fluorescent whitening agents, metal chelating agents, sulfur containing stabilizers, metal salts and diene compounds. Combinations of nitroxides, hydroxylamines or their salts, benzotriazole or benzophenone UV absorbers and a metal chelating agent are particularly effective. Selected derivatives of 1-oxyl-2,2,6,6-tetramethylpiperidin-4-ol and selected hydroxylamine salts are novel compounds and are surprisingly effective for this purpose.

US Patent:

6500303, Dec 31, 2002

Filed:

May 18, 2000

Appl. No.:

09/573401

Inventors:

Raymond R. Seltzer - New City NY
Jean-Pierre Wolf - Courtaman, CH
Cyril Heitner - Pierrefonds, CA
John A. Schmidt - Lile Bizard, CA
Peter F. McGarry - Lile Bizard, CA
Glen T. Cunkle - Stamford CT
Randall B. Nelson - Seattle WA

Assignee:

Ciba Specialty Chemicals Corporation - Tarrytown NY

International Classification:

D21C 712

US Classification:

162158, 162 70, 162 71, 162 76, 162 77, 162 81, 162160, 162162, 1621646, 1621647, 162165, 162166, 162167

Abstract:

Pulps or papers, especially chemimechanical or thermomechanical pulps or papers, which still contain lignin, have enhanced resistance to yellowing when they contain an effective stabilizing amount of a hindered amine compound which preferably is a nitroxide, a hydroxylamine or an ammonium salt thereof. This performance is often further enhanced by the presence of one or more coadditives selected from the group consisting of the UV absorbers, the polymeric inhibitors, the nitrones, the fluorescent whitening agents, metal chelating agents, sulfur containing stabilizers, metal salts and diene compounds. Combinations of nitroxides, hydroxylamines or their salts, benzotriazole or benzophenone UV absorbers and a metal chelating agent are particularly effective. Selected derivatives of 1-oxyl-2,2,6,6-tetramethyl-piperidin-4-ol and selected hydroxylamine salts are novel compounds and are surprisingly effective for this purpose.

US Patent:

6599326, Jul 29, 2003

Filed:

Jan 12, 2000

Appl. No.:

09/481665

Inventors:

Raymond Seltzer - New City NY
David Devore - Nyack NY
Glen T. Cunkle - Stamford CT
Cyril Heitner - Pierrefonds, CA
John A. Schmidt - Lile Bizard, CA
Peter F. McGarry - Lile Bizard, CA
Jean-Pierre Wolf - Courtaman, CH
Randall B. Nelson - Seattle WA

Assignee:

Ciba Specialty Chemicals Corporation - Tarrytown NY

International Classification:

D06L 300

US Classification:

8101, 8107, 8110, 162158, 162100, 162 91, 167 70, 167 71, 167 76, 167 77, 167 81, 167162

Abstract:

Chemical pulps or papers, especially kraft pulps or papers, which may still contain traces of lignin, have enhanced resistance to yellowing when they contain an effective stabilizing amount of a N,N-dialkylhydroxylamine, an ester, amide or thio substituted N,N-dialkylhydroxylamine or N,N-dibenzylhydroxylamine or an amminium salt thereof. This performance is often further enhanced by the presence of one or more coadditives selected from the group consisting of the UV absorbers, the polymeric inhibitors, the nitrones, the fluorescent whitening agents and metal chelating agents. Combinations of hydroxylamines or their salts, benzotriazole or benzophenone UV absorbers and a metal chelating agent are particularly effective. N,N-Diethylhydroxylamine and N,N-dibenzylhydroxylamine and their acid salts are surprisingly effective for this purpose.

US Patent:

20020088574, Jul 11, 2002

Filed:

Jan 20, 1999

Appl. No.:

09/234253

Inventors:

RAYMOND SELTZER - NEW CITY NY, US
DAVID DEVORE - LANGHORN PA, US
GLEN T. CUNKLE - STAMFORD CT, US
CYRIL HEITNER - PIERREFONDS, CA
JOHN A. SCHMIDT - L'ILE BIZARD, CA
PETER F. MCGARRY - L'ILE BIZARD, CA
JEAN-PIERRE WOLF - COURTAMAN, CH
RANDALL B. NELSON - SEATTLE WA, US

International Classification:

D21C003/20
C07D211/36
C07D211/40
C07D211/30
C07D211/54
C07D211/32

US Classification:

162/072000, 546/247000, 546/242000, 427/389900, 427/393000

Abstract:

Pulps or papers, especially chemimechanical or thermomechanical pulps or papers, which still contain lignin, have enhanced resistance to yellowing when they contain an effective stabilizing amount of a N,N-dialkylhydroxylamine, an ester, amide or thio substituted N,N-dialkylhydroxylamine or N,N-dibenzylhydroxylamine or an amminium salt thereof. This performance is often further enhanced by the presence of one or more coadditives selected from the group consisting of the UV absorbers, the polymeric inhibitors, the nitrones, the fluorescent whitening agents and metal chelating agents. Combinations of hydroxylamines or their salts, benzotriazole or benzophenone UV absorbers and a metal chelating agent are particularly effective. N,N-Diethylhydroxylamine and N,N-dibenzylhydroxylamine and their acid salts are surprisingly effective for this purpose.

US Patent:

20020174964, Nov 28, 2002

Filed:

May 7, 2002

Appl. No.:

10/140531

Inventors:

Raymond Seltzer - New City NY, US
David Devore - Langhorn PA, US
Glen Cunkle - Stamford CT, US
Cyril Heitner - Pierrefonds, CA
John Schmidt - L'ile Bizard, CA
Peter McGarry - L'ile Bizard, CA
Jean-Pierre Wolf - Courtaman, CH
Randall Nelson - Seattle WA, US

International Classification:

D21C001/00
D21F011/00
D21H023/00
C09D004/00
C09J004/00
C08L097/02
C09D197/02
C09J197/02

US Classification:

162/158000, 106/164300

Abstract:

Pulps or papers, especially chemimechanical or thermomechanical pulps or papers, which still contain lignin, have enhanced resistance to yellowing when they contain an effective stabilizing amount of a N,N-dialkylhydroxylamine, an ester, amide or thio item substituted N,N-dialkylhydroxylamine or N,N-dibenzylhydroxylamine or an amminium salt thereof. This performance is often further enhanced by the presence of one or more coadditives selected from the group consisting of the UV absorbers, the polymeric inhibitors, the nitrones, the fluorescent whitening agents and metal chelating agents. Combinations of hydroxylamines or their salts, benzotriazole or benzophenone UV absorbers and a metal chelating agent are particularly effective. N,N-Diethylhydroxylamine and N,N-dibenzylhydroxylamine and their acid salts are surprisingly effective for this purpose.

US Patent:

62547240, Jul 3, 2001

Filed:

Jul 20, 1998

Appl. No.:

9/119567

Inventors:

Raymond R. Seltzer - New City NY
Jean-Pierre Wolf - Courtaman, CH
Cyril Heitner - Pierrefonds, CA
John A. Schmidt - L'ile Bizard, CA
Peter F. McGarry - L'ile Bizard, CA
Glen T. Cunkle - Stamford CT
Randall B. Nelson - Seattle WA

Assignee:

Ciba Specialty Chemicals Corporation - Tarrytown NY

International Classification:

D21C 712

US Classification:

162 70

Abstract:

Pulps or papers, especially chemimechanical or thermomechanical pulps or papers, which still contain lignin, have enhanced resistance to yellowing when they contain an effective stabilizing amount of a hindered amine compound which preferably is a nitroxide, a hydroxylamine or an ammonium salt thereof. This performance is often further enhanced by the presence of one or more coadditives selected from the group consisting of the UV absorbers, the polymeric inhibitors, the nitrones, the fluorescent whitening agents, metal chelating agents, sulfur containing stabilizers, metal salts and diene compounds. Combinations of nitroxides, hydroxylamines or their salts, benzotriazole or benzophenone UV absorbers and a metal chelating agent are particularly effective. Selected derivatives of 1-oxyl-2,2,6,6-tetramethyl-piperidin-4-ol and selected hydroxylamine salts are novel compounds and are surprisingly effective for this purpose.

US Patent:

59024542, May 11, 1999

Filed:

Dec 13, 1996

Appl. No.:

8/766909

Inventors:

Randall B. Nelson - Seattle WA

Assignee:

Ciba Specialty Chemicals Corporation - Tarrytown NY

International Classification:

D21H11/00

US Classification:

162158

Abstract:

A process to increase the whiteness of paper made from a lignin-containing pulp is disclosed which comprises adding to an aqueous slurry comprising a lignin-containing pulp, in the paper making step, an effective amount of a chelating agent to decrease the content of salts of iron and other heavy metals to 100 ppm or less by weight, based on the dry weight of the pulp, or adding to said aqueous slurry an effective amount of a fluorescent whitening agent, or both a) and b).