Patents by Inventor Ramanathan Ravichandran

Ramanathan Ravichandran has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Flame retardant compositions
    Patent number: 6472456
    Abstract: Polyolefins, especially polypropylene, can be made flame retardant by the incorporation therein of a synergistic mixture of a selected hindered amine substituted by an alkoxy, cydoalkoxy or hydroxyalkoxy moiety and a selected organic or inorganic brominated and/or phosphorus containing flame retardant, such as ammonium polyphosphate or decabromodiphenyl oxide wherein the amount of organic or inorganic flame retardant required to achieve an acceptable level of flame retardancy is significantly reduced compared to that needed when the hindered amine is not present.
    Type: Grant
    Filed: November 3, 1999
    Date of Patent: October 29, 2002
    Assignee: Ciba Specialty Chemicals Corp.
    Inventors: Douglas Wayne Horsey, Stephen Mark Andrews, Leonard Harris Davis, Darrell David Dyas, Jr., Robert Leo Gray, Anunay Gupta, Bruce Vincent Hein, Joseph Stephen Puglisi, Ramanathan Ravichandran, Paul Shields, Rangarajan Srinivasan
  • Benzotriazole UV absorbers having enhanced durability
    Patent number: 6458872
    Abstract: Benzotriazole UV absorbers which are substituted at the 5-position of the benzo ring by an electron withdrawing group exhibit enhanced durability and very low loss rates when incorporated into automotive coatings. This is particularly the case when the 3-position of the phenyl ring is also substituted by phenyl or phenylalkyl such as &agr;-cumyl. Compounds where the 5-position of the benzo ring are substituted by perfluoroalkyl such as trifluoromethyl are particularly of interest for both their enhanced durability and for their excellent solubility and excellent color properties in some thermoplastic compositions when the phenyl ring is substituted at the 3-position by hydrogen or tert-alkyl.
    Type: Grant
    Filed: May 8, 2001
    Date of Patent: October 1, 2002
    Assignee: Ciba Specialty Chemicals Corporation
    Inventors: Ramanathan Ravichandran, Joseph Suhadolnik, Mervin G. Wood, Anthony Debellis, Robert E. Detlefsen, Revathi Iyengar, Jean-Pierre Wolf
  • Benzotriazoles containing &agr;-cumyl groups substituted by heteroatoms and compositions stabilized therewith
    Patent number: 6451887
    Abstract: 2H-Benzotriazole UV absorbers substituted at the 3-position and/or the 5-position of the phenyl ring by &agr;-cumyl moiety which is substituted by a heteroatom are particularly photostable in automotive coatings, and are of low color and exhibit low volatility in thermoplastic compositions.
    Type: Grant
    Filed: August 3, 2000
    Date of Patent: September 17, 2002
    Assignee: Ciba Specialty Chemicals Corporation
    Inventors: Mervin G. Wood, Joseph Suhadolnik, Ramanathan Ravichandran, Jacqueline Lau, Carmen Hendricks-Guy, Christophe Bulliard
  • Photostable, silylated benzotriazole UV absorbers and compositions stabilized therewith
    Publication number: 20020115753
    Abstract: Photostable, silylated benzotriazole compounds of formula (I) or (II) 1
    Type: Application
    Filed: August 1, 2001
    Publication date: August 22, 2002
    Inventors: Ramanathan Ravichandran, Joseph Suhadolnik, Mervin Wood, Rong Xiong
  • Bloom-resistant benzotriazole UV absorbers and compositions stabilized therewith
    Publication number: 20020111404
    Abstract: Benzotriazole UV absorbers substituted with a ultra long ester or amide moiety wherein the ester or amide group is a hydrocarbyl group of 25 to 100 carbon atoms or is a group of alkyl of 25 to 100 carbon atoms interrupted by 5 to 39 oxygen atoms and terminated with an omega-OH or an omega-OR group exhibit excellent stabilization efficacy while they concomitantly do not bloom when incorporated into polyolefin films. These benzotriazole UV absorbers also provide excellent protection to white, dyed, dipped, unscented and/or scented candle wax from discoloration and degradation.
    Type: Application
    Filed: February 11, 2002
    Publication date: August 15, 2002
    Inventors: Mervin Wood, Ramanathan Ravichandran, Douglas Wayne Horsey, Anunay Gupta, Deborah DeHessa, Luther A. R. Hall, Andrea Smith, Stephen Mark Andrews
  • Benzotriazole UV absorbers having enhanced durability
    Publication number: 20020099221
    Abstract: Benzotriazole UV absorbers which are substituted at the 5-position of the benzo ring by an electron withdrawing group exhibit enhanced durability and very low loss rates when incorporated into automotive coatings. This is particularly the case when the 3-position of the phenyl ring is also substituted by phenyl or phenylalkyl such as &agr;-cumyl. Compounds where the 5-position of the benzo ring are substituted by perfluoroalkyl such as trifluoromethyl are particularly of interest for both their enhanced durability and for their excellent solubility and excellent color properties in some thermoplastic compositions when the phenyl ring is substituted at the 3-position by hydrogen or tert-alkyl.
    Type: Application
    Filed: December 18, 2001
    Publication date: July 25, 2002
    Inventors: Ramanathan Ravichandran, Joseph Suhadolnik, Mervin G. Wood, Anthony Debellis, Robert E. Detlefsen, Revathi lyengar, Jean-Pierre Wolf
  • Hydroxy-substituted N-alkoxy hindered amines and compositions stabilized therewith
    Patent number: 6420562
    Abstract: Hindered amines substituted on the N-atom with an —O—E—OH moiety are particularly effective in stabilizing polyolefin and automotive coating compositions against the deleterious effects of oxidative, thermal and actinic radiation where the presence of the OH group on the compounds adds important properties not attainable by the use of normal —O—E moieties.
    Type: Grant
    Filed: February 21, 2001
    Date of Patent: July 16, 2002
    Assignee: Ciba Speciality Chemicals Corporation
    Inventors: James P. Galbo, Gerald A. Capocci, Nancy N. Cliff, Robert E. Detlefsen, Michael P. DiFazio, Ramanathan Ravichandran, Peter Solera
  • Hydroxy-substituted N-alkoxy hindered amines and compositions stabilized therewith
    Patent number: 6420463
    Abstract: Hindered amines substituted on the N-atom with an -O-E-OH moiety are particularly effective in stabilizing polyolefin and automotive coating compositions against the deleterious effects of oxidative, thermal and actinic radiation where the presence of the OH group on the compounds adds important properties not attainable by the use of normal -O-E moieties.
    Type: Grant
    Filed: February 21, 2001
    Date of Patent: July 16, 2002
    Assignee: Ciba Specialty Chemicals Corp.
    Inventors: James P. Galbo, Gerald A. Capocci, Nancy N. Cliff, Robert E. Detlefsen, Michael P. DiFazio, Ramanathan Ravichandran, Peter Solera
  • Hydroxy-substituted N-alkoxy hindered amines and compositions stabilized therewith
    Patent number: 6403681
    Abstract: Hindered amines substituted on the N-atom with an —O—E—OH moiety are particularly effective in stabilizing polyolefin and automotive coating compositions against the deleterious effects of oxidative, thermal and actinic radiation where the presence of the OH group on the compounds adds important properties not attainable by the use of normal —O—E moieties.
    Type: Grant
    Filed: February 21, 2001
    Date of Patent: June 11, 2002
    Assignee: Ciba Specialty Chemicals Corporation
    Inventors: James P. Galbo, Gerald A. Capocci, Nancy N. Cliff, Robert E. Detlefsen, Michael P. DiFazio, Ramanathan Ravichandran, Peter Solera
  • Benzotriazole UV absorbers having enhanced durability
    Publication number: 20020065341
    Abstract: Benzotriazole UV absorbers which are substituted at the 5-position of the benzo ring by an electron withdrawing group exhibit enhanced durability and very low loss rates when incorporated into automotive coatings. This is particularly the case when the 3-position of the phenyl ring is also substituted by phenyl or phenylalkyl such as &agr;-cumyl. Compounds where the 5-position of the benzo ring are substituted by perfluoroalkyl such as trifluoromethyl are particularly of interest for both their enhanced durability and for their excellent solubility and excellent color properties in some thermoplastic compositions when the phenyl ring is substituted at the 3-position by hydrogen or tert-alkyl.
    Type: Application
    Filed: May 7, 2001
    Publication date: May 30, 2002
    Inventors: Ramanathan Ravichandran, Joseph Suhadolnik, Mervin G. Wood, Anthony Debellis, Robert E. Detlefsen, Revathi Iyengar, Jean-Pierre Wolf
  • Hydroxy-substituted N-alkoxy hindered amines and compositions stabilized therewith
    Patent number: 6392041
    Abstract: Hindered amines substituted on the N-atom with an —O—E—OH moiety are particularly effective in stabilizing polyolefin and automotive coating compositions against the deleterious effects of oxidative, thermal and actinic radiation where the presence of the OH group on the compounds adds important properties not attainable by the use of normal —O—E moieties.
    Type: Grant
    Filed: February 17, 2000
    Date of Patent: May 21, 2002
    Assignee: Ciba Specialty Chemicals Corporation
    Inventors: James Peter Galbo, Gerald A. Capocci, Nancy N. Cliff, Robert E. Detlefsen, Michael P. DiFazio, Ramanathan Ravichandran, Peter Solera, Christophe Bulliard
  • Hydroxy-substituted N-alkoxy hindered amines and compositions stabilized therewith
    Patent number: 6391949
    Abstract: Hindered amines substituted on the N-atom with an —O—E—OH moiety are particularly effective in stabilizing polyolefin and automotive coating compositions against the deleterious effects of oxidative, thermal and actinic radiation where the presence of the OH group on the compounds adds important properties not attainable by the use of normal —O—E moieties.
    Type: Grant
    Filed: February 22, 2001
    Date of Patent: May 21, 2002
    Assignee: Ciba Specialty Chemicals Corporation
    Inventors: James P. Galbo, Gerald A. Capocci, Nancy N. Cliff, Robert E. Detlefsen, Michael P. DiFazio, Ramanathan Ravichandran, Peter Solera
  • 2H-benzotriazole UV absorders substituted with 1,1-diphenylalkyl groups and compositions stabilized therewith
    Patent number: 6392056
    Abstract: 2H-Benzotriazole UV absorbers substituted at the 3-position or at the 5-position of the phenyl ring by a 1,1-diphenylalkyl moiety, particularly a 1,1-diphenylethyl group, are particularly photostable in automotive coatings, and are of low color and exhibit low volatility in thermoplastic compositions.
    Type: Grant
    Filed: August 3, 2000
    Date of Patent: May 21, 2002
    Assignee: Ciba Specialty Chemical Corporation
    Inventors: Mervin G. Wood, Ramanathan Ravichandran, Joseph Suhadolnik, David Bramer, Jacqueline Lau, Anthony DeBellis
  • Hydroxy-substituted N-alkoxy hindered amines and compositions stabilized therewith
    Publication number: 20020058735
    Abstract: Hindered amines substituted on the N-atom with an -O-E-OH moiety are particularly effective in stabilizing polyolefin and automotive coating compositions against the deleterious effects of oxidative, thermal and actinic radiation where the presence of the OH group on the compounds adds important properties not attainable by the use of normal -O-E moieties.
    Type: Application
    Filed: October 3, 2001
    Publication date: May 16, 2002
    Inventors: James Peter Galbo, Gerald A. Capocci, Nancy N. Cliff, Robert E. Detlefsen, Mchael P. DiFazio, Ramanathan Ravichandran, Peter Solera, Christophe Bulliard
  • Hydroxy-substituted N-alkoxy hindered amines and compositions stabilized therewith
    Patent number: 6388072
    Abstract: Hindered amines substituted on the N-atom with an —O—E—OH moiety are particularly effective in stabilizing polyolefin and automotive coating compositions against the deleterious effects of oxidative, thermal and actinic radiation where the presence of the OH group on the compounds adds important properties not attainable by the use of normal —O—E moieties.
    Type: Grant
    Filed: February 21, 2001
    Date of Patent: May 14, 2002
    Assignee: Ciba Specialty Chemicals Corporation
    Inventors: James P. Galbo, Gerald A. Capocci, Nancy N. Cliff, Robert E. Detlefsen, Michael P. DiFazio, Ramanathan Ravichandran, Peter Solera
  • Substituted 5-heteroaryl-2-(2-hydroxyphenyl)-2h-benzotriazole UV absorbers, a process for preparation thereof and compositions stabilized therewith
    Patent number: 6387992
    Abstract: Compounds of formula I or II where R is a heteroaryl moiety, such as 3-pyridyl, or T is a heteroaryl moiety, such as thien-2,5-diyl, and E1 and E2 are independently hydrogen, alkyl, aralkyl and the like, are prepared by reaction of a benzotriazole substituted on the 5-position of the benzo ring by a halogen atom with a heteroarylboronic acid or ester in the presence of a transition-metal catalyst, such as palladium (II) diacetate. The benzotriazole compounds of formula I are particularly efficacious as stabilizers for automotive coatings and candle wax.
    Type: Grant
    Filed: November 27, 2000
    Date of Patent: May 14, 2002
    Assignee: Ciba Specialty Chemicals Corporation
    Inventors: Stephen D. Pastor, Anthony DeBellis, Mervin G. Wood, Joseph Suhadolnik, Deborah DeHessa, Ramanathan Ravichandran
  • Hydroxy-substituted N-alkoxy hindered amines and compositions stabilized therewith
    Patent number: 6380389
    Abstract: Hindered amines substituted on the N-atom with an —O—E—OH moiety are particularly effective in stabilizing polyolefin and automotive coating compositions against the deleterious effects of oxidative, thermal and actinic radiation where the presence of the OH group on the compounds adds important properties not attainable by the use of normal —O—E moieties.
    Type: Grant
    Filed: February 21, 2001
    Date of Patent: April 30, 2002
    Assignee: Ciba Specialty Chemicals Corporation
    Inventors: James P. Galbo, Gerald A. Capocci, Nancy N. Cliff, Robert E. Detlefsen, Michael P. DiFazio, Ramanathan Ravichandran, Peter Solera
  • Bloom-resistant benzotriazole UV absorbers and compositions stabilized therewith
    Patent number: 6380285
    Abstract: Benzotriazole UV absorbers substituted with a ultra long ester or amide moiety wherein the ester or amide group is a hydrocarbyl group of 25 to 100 carbon atoms or is a group of alkyl of 25 to 100 carbon atoms interrupted by 5 to 39 oxygen atoms and terminated with an omega-OH or an omega-OR group exhibit excellent stabilization efficacy while they concomitantly do not bloom when incorporated into polyolefin films. These benzotriazole UV absorbers also provide excellent protection to white, dyed, dipped, unscented and/or scented candle wax from discoloration and degradation.
    Type: Grant
    Filed: February 1, 2000
    Date of Patent: April 30, 2002
    Assignee: Ciba Specialty Chemicals Corporation
    Inventors: Mervin Wood, Ramanathan Ravichandran, Douglas Wayne Horsey, Anunay Gupta, Deborah DeHessa, Luther A. R. Hall, Andrea Smith, Stephen Mark Andrews
  • Hydroxy-substituted N-alkoxy hindered amines and compositions stabilized therewith
    Patent number: 6376584
    Abstract: Hindered amines substituted on the N-atom with an hydroxy-substituted alkoxy moiety are particularly effective in stabilizing organic polymer compositions against the deleterious effects of oxidative, thermal and actinic radiation where the presence of the OH group on the compounds adds important properties not otherwise attainable.
    Type: Grant
    Filed: February 27, 2001
    Date of Patent: April 23, 2002
    Assignee: Ciba Specialty Chemicals Corporation
    Inventors: James Peter Galbo, Gerald A. Capocci, Nancy N. Cliff, Robert E. Detlefsen, Michael P. DiFazio, Ramanathan Ravichandran, Peter Solera, Christophe Bulliard
  • Hydroxy-substituted N-alkoxy hindered amines and compositions stabilized therewith
    Publication number: 20020040145
    Abstract: Hindered amines substituted on the N-atom with an —O—E—OH moiety are particularly effective in stabilizing polyolefin and automotive coating compositions against the deleterious effects of oxidative, thermal and actinic radiation where the presence of the OH group on the compounds adds important properties not attainable by the use of normal —O—E moieties.
    Type: Application
    Filed: September 27, 2001
    Publication date: April 4, 2002
    Inventors: James P. Galbo, Gerald A. Capocci, Nancy N. Cliff, Robert E. Detlefsen, Michael P. DiFazio, Ramanathan Ravichandran, Peter Solera