Patents by Inventor Michael T. Sheehan

Michael T. Sheehan 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).

  • Propanoates and processes for preparing the same
    Patent number: 8163464
    Abstract: A process for preparing proponates which comprises the steps of (i) supplying a solution of methanol containing 4-hydroxyphenylmethylcarbinol, (ii) subjecting said solution to an acid catalyzed displacement reaction for a sufficient period of time and under suitable conditions of temperature and pressure to convert substantially all of said carbinol to 4-hydroxyphenylmethylcarbinol methyl ether in solution, (iii) replacing the methanol in said ether containing solution with a second solvent and (iv) reacting the ether containing ethyl lactate solution with a suitable acid catalyst for a sufficient period of time and under suitable conditions of temperature and pressure to form said propanoates. New compositions of matter which comprise the propanoates, prepared in the above manner, have application in the electronic chemicals market such as in a photoresist composition.
    Type: Grant
    Filed: August 4, 2009
    Date of Patent: April 24, 2012
    Assignee: Du Pont Electronic Polymers L.P.
    Inventors: Michael T. Sheehan, James R. Sounik, George W. Clark, III
  • Epoxy resin, blocked polyisocyanate or polymers with polyhydroxystyrenes having novolak structure
    Patent number: 7897697
    Abstract: A process for preparing derivatized poly(4-hydroxystryrene) having a novolak type structure which comprises the steps of (i) supplying a solution of methanol containing 4-hydroxyphenylmethylcarbinol, (ii) subjecting said solution to an acid catalyzed displacement reaction for a sufficient period of time and under suitable conditions of temperature and pressure to convert substantially all of said carbinol to 4-hydroxyphenylmethylcarbinol methyl ether in solution, (iii) polymerizing said ether containing solution in the presence of a suitable acid catalyst for a sufficient period of time and under suitable conditions of temperature and pressure to form a novolak type polymer.
    Type: Grant
    Filed: June 24, 2009
    Date of Patent: March 1, 2011
    Assignee: DuPont Electronic Polymers L.P.
    Inventors: Michael T. Sheehan, Edward G. Zey
  • Derivatized polyhydroxystyrenes (DPHS) with a novolak type structure and blocked DPHS (BDPHS) and processes for preparing the same
    Publication number: 20100105785
    Abstract: A process for preparing a blocked derivatized poly(4-hydroxystryrene)-DPHS having a novolak type structure which comprises the steps of (i) supplying a solution of methanol containing 4-hydroxyphenylmethylcarbinol, (ii) subjecting said solution to an acid catalyzed displacement reaction for a sufficient period of time and under suitable conditions of temperature and pressure to convert substantially all of said carbinol to 4-hydroxyphenylmethylcarbinol methyl ether in solution, (iii) polymerizing said ether containing solution in the presence of a suitable acid catalyst for a sufficient period of time and under suitable conditions of temperature and pressure to form a novolak type polymer; and (iv) reacting said polymer with a vinyl ether, a dialkyl dicarbonate, or a mixture of vinyl ether and a dialkyl dicarbonate to form the blocked DPHS.
    Type: Application
    Filed: December 23, 2009
    Publication date: April 29, 2010
    Inventors: Michael T. Sheehan, Edward G. Zey, Hiroshi Okazaki
  • Derivatized polyhydroxystyrenes with a novolak type structure and processes for preparing the same
    Patent number: 7678945
    Abstract: A process for preparing derivatized poly(4-hydroxystyrene) having a novolak type structure which comprises the steps of (i) supplying a solution of methanol containing 4-hydroxyphenylmethylcarbinol, (ii) subjecting said solution to an acid catalyzed displacement reaction for a sufficient period of time and under suitable conditions of temperature and pressure to convert substantially all of said carbinol to 4-hydroxyphenylmethylcarbinol methyl ether in solution, (iii) polymerizing said ether containing solution in the presence of a suitable acid catalyst for a sufficient period of time and under suitable conditions of temperature and pressure to form a novolak type polymer.
    Type: Grant
    Filed: April 7, 2008
    Date of Patent: March 16, 2010
    Assignee: Dupont Electronic Polymers L.P.
    Inventors: Michael T. Sheehan, Edward G. Zey
  • New propanoates and processes for preparing the same
    Publication number: 20100047714
    Abstract: A process for preparing proponates which comprises the steps of (i) supplying a solution of methanol containing 4-hydroxyphenylmethylcarbinol, (ii) subjecting said solution to an acid catalyzed displacement reaction for a sufficient period of time and under suitable conditions of temperature and pressure to convert substantially all of said carbinol to 4-hydroxyphenylmethylcarbinol methyl ether in solution, (iii) replacing the methanol in said ether containing solution with a second solvent and (iv) reacting the ether containing ethyl lactate solution with a suitable acid catalyst for a sufficient period of time and under suitable conditions of temperature and pressure to form said propanoates. New compositions of matter which comprise the propanoates, prepared in the above manner, have application in the electronic chemicals market such as in a photoresist composition.
    Type: Application
    Filed: August 4, 2009
    Publication date: February 25, 2010
    Inventors: Michael T. Sheehan, James R. Sounik, George W. Clark, III
  • Derivatized polyhydroxystyrenes (DPHS) with a novolak type structure and blocked DPHS (BDPHS) and processes for preparing the same
    Patent number: 7662538
    Abstract: A process for preparing a blocked derivatized poly(4-hydroxystryrene)-DPHS having a novolak type structure which comprises the steps of (i) supplying a solution of methanol containing 4-hydroxyphenylmethylcarbinol, (ii) subjecting said solution to an acid catalyzed displacement reaction for a sufficient period of time and under suitable conditions of temperature and pressure to convert substantially all of said carbinol to 4-hydroxyphenylmethylcarbinol methyl ether in solution, (iii) polymerizing said ether containing solution in the presence of a suitable acid catalyst for a sufficient period of time and under suitable conditions of temperature and pressure to form a novolak type polymer; and (iv) reacting said polymer with a vinyl ether, a dialkyl dicarbonate, or a mixture of vinyl ether and a dialkyl dicarbonate to form the blocked DPHS.
    Type: Grant
    Filed: October 13, 2005
    Date of Patent: February 16, 2010
    Assignee: Du Pont Electronic Polymers L.P.
    Inventors: Michael T. Sheehan, Edward G. Zey, Hiroshi Okazaki
  • Derivatized novolak polyhydroxystyrene
    Patent number: 7632896
    Abstract: A process for preparing derivatized poly(4-hydroxystryrene) having a novolak type structure which comprises the steps of (i) supplying a solution of methanol containing 4-hydroxyphenylmethylcarbinol, (ii) subjecting said solution to an acid catalyzed displacement reaction for a sufficient period of time and under suitable conditions of temperature and pressure to convert substantially all of said carbinol to 4-hydroxyphenylmethylcarbinol methyl ether in solution, (iii) polymerizing said ether containing solution in the presence of a suitable acid catalyst for a sufficient period of time and under suitable conditions of temperature and pressure to form a novolak type polymer.
    Type: Grant
    Filed: April 7, 2008
    Date of Patent: December 15, 2009
    Assignee: Dupont Electronic Polymers L.P.
    Inventors: Michael T. Sheehan, Edward G. Zey
  • Derivatized Polyhydroxystyrenes with a novolak type structure and processes for preparing the same
    Publication number: 20090264592
    Abstract: A process for preparing derivatized poly(4-hydroxystryrene) having a novolak type structure which comprises the steps of (i) supplying a solution of methanol containing 4-hydroxyphenylmethylcarbinol, (ii) subjecting said solution to an acid catalyzed displacement reaction for a sufficient period of time and under suitable conditions of temperature and pressure to convert substantially all of said carbinol to 4-hydroxyphenylmethylcarbinol methyl ether in solution, (iii) polymerizing said ether containing solution in the presence of a suitable acid catalyst for a sufficient period of time and under suitable conditions of temperature and pressure to form a novolak type polymer.
    Type: Application
    Filed: June 24, 2009
    Publication date: October 22, 2009
    Inventors: Michael T. Sheehan, Edward G. Zey
  • Epoxy resins or polyisocyanates reacted with derivatized novolak polyhydroxystyrene
    Patent number: 7566752
    Abstract: A process for preparing derivatized poly(4-hydroxystryrene) having a novolak type structure which comprises the steps of (i) supplying a solution of methanol containing 4-hydroxyphenylmethylcarbinol, (ii) subjecting said solution to an acid catalyzed displacement reaction for a sufficient period of time and under suitable conditions of temperature and pressure to convert substantially all of said carbinol to 4-hydroxyphenylmethylcarbinol methyl ether in solution, (iii) polymerizing said ether containing solution in the presence of a suitable acid catalyst for a sufficient period of time and under suitable conditions of temperature and pressure to form a novolak type polymer.
    Type: Grant
    Filed: April 7, 2008
    Date of Patent: July 28, 2009
    Assignee: Du Pont Electronic Polymers L.P.
    Inventors: Michael T. Sheehan, Edward G. Zey
  • Derivatized polyhydroxystyrenes with a novolak type structure and processes for preparing the same
    Publication number: 20080214874
    Abstract: A process for preparing derivatized poly(4-hydroxystyrene) having a novolak type structure which comprises the steps of (i) supplying a solution of methanol containing 4-hydroxyphenylmethylcarbinol, (ii) subjecting said solution to an acid catalyzed displacement reaction for a sufficient period of time and under suitable conditions of temperature and pressure to convert substantially all of said carbinol to 4-hydroxyphenylmethylcarbinol methyl ether in solution, (iii) polymerizing said ether containing solution in the presence of a suitable acid catalyst for a sufficient period of time and under suitable conditions of temperature and pressure to form a novolak type polymer.
    Type: Application
    Filed: April 7, 2008
    Publication date: September 4, 2008
    Inventors: Michael T. Sheehan, Edward G. Zey
  • Derivatized polyhydroxystyrenes with a novolak type structure and processes for preparing the same
    Publication number: 20080188619
    Abstract: A process for preparing derivatized poly(4-hydroxystryrene) having a novolak type structure which comprises the steps of (i) supplying a solution of methanol containing 4-hydroxyphenylmethylcarbinol, (ii) subjecting said solution to an acid catalyzed displacement reaction for a sufficient period of time and under suitable conditions of temperature and pressure to convert substantially all of said carbinol to 4-hydroxyphenylmethylcarbinol methyl ether in solution, (iii) polymerizing said ether containing solution in the presence of a suitable acid catalyst for a sufficient period of time and under suitable conditions of temperature and pressure to form a novolak type polymer.
    Type: Application
    Filed: April 7, 2008
    Publication date: August 7, 2008
    Inventors: Michael T. Sheehan, Edward G. Zey
  • Derivatized polyhydroxystyrenes with a novolak type structure and processes for preparing the same
    Publication number: 20080188692
    Abstract: A process for preparing derivatized poly(4-hydroxystryrene) having a novolak type structure which comprises the steps of (i) supplying a solution of methanol containing 4-hydroxyphenylmethylcarbinol, (ii) subjecting said solution to an acid catalyzed displacement reaction for a sufficient period of time and under suitable conditions of temperature and pressure to convert substantially all of said carbinol to 4-hydroxyphenylmethylcarbinol methyl ether in solution, (iii) polymerizing said ether containing solution in the presence of a suitable acid catalyst for a sufficient period of time and under suitable conditions of temperature and pressure to form a novolak type polymer.
    Type: Application
    Filed: April 7, 2008
    Publication date: August 7, 2008
    Inventors: Michael T. Sheehan, Edward G. Zey
  • Derivatized novolak polyhydroxystyrene from hydroxyphenylmethylcarbinol
    Patent number: 7371800
    Abstract: A process for preparing derivatized poly(4-hydroxystryrene) having a novolak type structure which comprises the steps of (i) supplying a solution of methanol containing 4-hydroxyphenylmethylcarbinol, (ii) subjecting said solution to an acid catalyzed displacement reaction for a sufficient period of time and under suitable conditions of temperature and pressure to convert substantially all of said carbinol to 4-hydroxyphenylmethylcarbinol methyl ether in solution, (iii) polymerizing said ether containing solution in the presence of a suitable acid catalyst for a sufficient period of time and under suitable conditions of temperature and pressure to form a novolak type polymer.
    Type: Grant
    Filed: April 22, 2005
    Date of Patent: May 13, 2008
    Assignee: DuPont Electronic Polymers L.P.
    Inventors: Michael T. Sheehan, Edward G. Zey
  • Anhydrous, liquid phase process for preparing hydroxyl containing polymers of enhanced purity
    Patent number: 7312281
    Abstract: An anhydrous, liquid phase process for preparing hydroxyl containing polymers of enhanced purity comprising the steps of polymerization, purification, transesterification, purification, catalyst removal, and solvent exchange. The resultant polymer in solution can be used directly, without further processing steps, to prepare a photoresist composition.
    Type: Grant
    Filed: February 24, 2005
    Date of Patent: December 25, 2007
    Assignee: DuPont Electronic Polymers L.P.
    Inventors: Michael T. Sheehan, James R. Sounik
  • Polymer purification
    Patent number: 7148320
    Abstract: Polymers derived from various monomers are purified by fractionalization of the crude polymers in a solvent/non solvent system via reverse precipitation.
    Type: Grant
    Filed: November 24, 2004
    Date of Patent: December 12, 2006
    Assignee: Dupont Electronic Polymers L.P.
    Inventors: Michael T. Sheehan, James R. Sounik
  • Anhydrous, liquid phase process for preparing hydroxyl containing polymers of enhanced purity
    Patent number: 6864324
    Abstract: An anhydrous, liquid phase process for preparing hydroxyl containing polymers of enhanced purity comprising the steps of polymerization, purification, transesterification, purification, catalyst removal, and solvent exchange. The resultant polymer in solution can be used directly, without further processing steps, to prepare a photoresist composition.
    Type: Grant
    Filed: April 19, 2002
    Date of Patent: March 8, 2005
    Assignee: Chem First Electronic Materials L.P.
    Inventors: Michael T. Sheehan, James R. Sounik
  • Purification means
    Patent number: 6787611
    Abstract: Polymers derived from 4-acyloxystyrene are purified by fractionalization plus heating and cooling of the polymers in alcoholic solvents.
    Type: Grant
    Filed: February 24, 2003
    Date of Patent: September 7, 2004
    Assignee: Chemfirst Electronic Materials L.P.
    Inventor: Michael T. Sheehan
  • Preparation of homo-, co- and terpolymers of substituted styrenes
    Patent number: 6759483
    Abstract: A novel one-pot cost efficient process for the preparation of homo-, co- and terpolymers of p-hydroxystyrene or substituted p-hydroxystyrene and alkyl acrylates. The process involves polymerization of esters of p-hydroxystyrene (or its substituted analogs), alkyl acrylate monomers and/or one or more of ethylenically unsaturated monomers in an alcohol solvent in the presence of a free radical initiator. The reaction mixture containing the so formed polymer is subjected to transesterification conditions using a catalytic amount of catalyst to result in co- and/or terpolymers of p-hydroxystyrene without cleavage of the alkyl ester in the acrylate repeat unit, and then removing the catalyst from the system. Preferred embodiments include homopolymers of p-hydroxystyrene, copolymer of p-hydroxystyrene and tert-butyl acrylate and terpolymer of p-hydroxystyrene, tert-butyl acrylate and styrene. These polymers have a wide variety of applications including as photoresists in microelectronics industry.
    Type: Grant
    Filed: April 19, 2002
    Date of Patent: July 6, 2004
    Assignee: Chemfirst Electronic Materials L.P.
    Inventors: Michael T. Sheehan, James R. Sounik
  • Anhydrous, liquid phase process for preparing hydroxyl containing polymers of enhanced purity
    Publication number: 20030199641
    Abstract: An anhydrous, liquid phase process for preparing hydroxyl containing polymers of enhanced purity comprising the steps of polymerization, purification, transesterification, purification, catalyst removal, and solvent exchange. The resultant polymer in solution can be used directly, without further processing steps, to prepare a photoresist composition.
    Type: Application
    Filed: April 19, 2002
    Publication date: October 23, 2003
    Inventors: Michael T. Sheehan, James R. Sounik
  • Purification means
    Publication number: 20030144470
    Abstract: Polymers derived from 4-acyloxystyrene are purified by fractionalization plus heating and cooling of the polymers in alcoholic solvents.
    Type: Application
    Filed: February 24, 2003
    Publication date: July 31, 2003
    Inventor: Michael T. Sheehan