Patents by Inventor Arijit M. DasGupta

Arijit M. DasGupta 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).

  • Polyvinyl butyral sheet
    Patent number: 5137954
    Abstract: Sheet for safety glazings made of: a) polyvinyl butyral internally plasticized by the presence in the polymer of C.sub.7 to C.sub.15 aliphatic aldehyde groups and b) an external plasticizer in amount sufficient to provide a sheet glass transition temperature of about 25.degree. to 30.degree. C.
    Type: Grant
    Filed: September 30, 1991
    Date of Patent: August 11, 1992
    Assignee: Monsanto Company
    Inventors: Arijit M. DasGupta, Donald J. David, Roland J. Tetreault
  • Ionomeric polyvinyl butyral
    Patent number: 5030688
    Abstract: Polyvinyl butyral resin containing a modification-promoting amount of up to about 15 mole % ionomeric groups which are preferably the metal sulfonate salt of an aldehyde chemically combined with oxygen atoms of adjacent precursor vinyl alcohol groups. Such resin is prepared from a precursor PVOH containing chemically bound ionic acid groups.
    Type: Grant
    Filed: November 7, 1988
    Date of Patent: July 9, 1991
    Assignee: Monsanto Company
    Inventors: Ashok Misra, Donald J. David, Arijit M. DasGupta
  • Reducing blocking and increasing flow of plasticized polyvinyl butyral sheet
    Patent number: 4999078
    Abstract: A process for increasing both resistance to blocking and flow during laminating of plasticized polyvinyl butyral sheet which comprises incorporating into the formulation of the sheet a block-reducing and flow-promoting amount, preferably up to about 10 mole %, of ionomeric groups chemically bound to oxygen atoms of adjacent precursor vinyl alcohol groups.
    Type: Grant
    Filed: November 7, 1988
    Date of Patent: March 12, 1991
    Assignee: Monsanto Company
    Inventors: Ashok Misra, Donald J. David, Arijit M. DasGupta
  • Polyvinyl butyral sheet
    Patent number: 4999253
    Abstract: Plasticized polyvinyl butyral sheet containing a modification-producing amount of ionomeric groups which are preferably the metal sulfonate salt of an aldehyde chemically combined with oxygen atoms of adjacent precursor vinyl alcohol groups.
    Type: Grant
    Filed: November 7, 1988
    Date of Patent: March 12, 1991
    Assignee: Monsanto Company
    Inventors: Ashok Misra, Donald J. David, Arijit M. DasGupta
  • Process for preparing polyinyl butyral sheet
    Patent number: 4968743
    Abstract: In a process for preparation of polyvinyl butyral sheet by blending polyvinyl butyral with plasticizer and extruding the blend to form the sheet, the step in combination therewith of including in the blend a modification-promoting amount, preferably up to about 10 mole % based on polyvinyl butyral, of ionomeric groups chemically bound to polyvinyl butyral forming the sheet.
    Type: Grant
    Filed: November 7, 1988
    Date of Patent: November 6, 1990
    Assignee: Monsanto Company
    Inventors: Ashok Misra, Donald J. David, Arijit M. DasGupta
  • Polyvinyl butyral polyblend
    Patent number: 4968744
    Abstract: A polyblend comprising first and second polyvinyl butyral components admixed with plasticizer, one of the components present in minor amount (preferably 10 to 30 weight %) containing chemically bound ionomeric groups which are preferably the metal salt of an aldehyde.
    Type: Grant
    Filed: November 7, 1988
    Date of Patent: November 6, 1990
    Assignee: Monsanto Company
    Inventors: Ashok Misra, Donald J. David, Arijit M. DasGupta
  • Method of producing ionomeric polyvinyl butyral
    Patent number: 4968745
    Abstract: A method of producing ionomeric polyvinyl butyral by the steps of (a) condensing polyvinyl alcohol with an aldehyde containing an acid group in the presence of a catalyst; (b) acetalizing the reaction product of step (a) in situ with butyraldehyde to form polyvinyl butyral and (c) neutralizing the reaction product of step (b) to form ionomeric polyvinyl butyral.
    Type: Grant
    Filed: November 7, 1988
    Date of Patent: November 6, 1990
    Assignee: Monsanto Company
    Inventors: Ashok Misra, Donald J. David, Arijit M. DasGupta