Patents by Inventor Donn DuBois

Donn DuBois 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).

  • Asphalt acrylic monomer-containing polymer composition
    Patent number: 5214082
    Abstract: A bituminous composition comprising a bituminous component and a polymer which comprises at least one block of a conjugated diolefin and at least one block of an acrylic monomer.
    Type: Grant
    Filed: July 28, 1992
    Date of Patent: May 25, 1993
    Assignee: Shell Oil Company
    Inventors: Richard Gelles, Donn A. DuBois
  • Thermoplastic elastomers
    Patent number: 5194510
    Abstract: Block copolymers useful in formulations of adhesives, coatings, and lubricating oils have a particular structure comprising blocks of a polymerized alkenyl aromatic compound such as styrene, an internal block of a polymerized conjugated alkadiene such as butadiene, as well as selectively hydrogenated derivatives thereof, and a polar block of a polymerized alkyl methacrylate such as t-butyl methacrylate.
    Type: Grant
    Filed: May 21, 1990
    Date of Patent: March 16, 1993
    Assignee: Shell Oil Company
    Inventors: Donn A. DuBois, Carl L. Willis
  • Asphalt acrylic monomer-containing block polymer composition
    Patent number: 5189083
    Abstract: A bituminous composition comprising a bituminous component and a polymer which comprises at least one block of a conjugated diolefin and at least one block of an alkyl methacrylate.
    Type: Grant
    Filed: March 18, 1992
    Date of Patent: February 23, 1993
    Assignee: Shell Oil Company
    Inventors: Richard Gelles, Donn A. DuBois
  • Polymer and process for making the same
    Patent number: 5098958
    Abstract: Vinyl ether copolymers and a method of preparing the same. The vinyl ether is copolymerized with styrene, alkyl-substituted styrenes, alkoxy-substituted styrenes and mixtures thereof. In the process, a cadmium halide is used with hydrogen iodide or a suitable iodine containing electrophile, as the coinitiator.
    Type: Grant
    Filed: March 26, 1991
    Date of Patent: March 24, 1992
    Assignee: Shell Oil Company
    Inventor: Donn DuBois
  • Polymers of alkoxystyrenes and a process to produce polymers of alkoxystyrenes
    Patent number: 5073610
    Abstract: A process to polymerize alkoxystyrenes utilizing a zeolite as the initiator is provided. Polymers of p-methoxystyrene having number average molecular weights in excess of 1.times.10.sup.6 are prepared by room temperature polymerization. The invention also provides a high molecular weight polymer of alkoxystyrenes which has a broad molecular weight distribution.
    Type: Grant
    Filed: September 28, 1990
    Date of Patent: December 17, 1991
    Assignee: Shell Oil Company
    Inventor: Donn A. DuBois
  • Process to produce polymers of styrene derivatives
    Patent number: 5068294
    Abstract: A method of preparing styrene derivative polymers is provided. The process utilizes as a catalyst an iodine containing electrophile and a zeolite. The styrene derivatives cationically polymerize to polymers without the need for heavy metal initiators. The styrene derivatives may be copolymerized with vinyl ethers to form random or block copolymers. Preferred styrene derivatives include styrene and methoxystyrenes.
    Type: Grant
    Filed: September 28, 1990
    Date of Patent: November 26, 1991
    Assignee: Shell Oil Company
    Inventor: Donn A. DuBois
  • Process to prepare vinyl ether polymers
    Patent number: 5055536
    Abstract: A method of preparing vinyl ether polymers is provided. The process utilizes as a catalyst an iodine containing electrophile and a zeolite. The vinyl ethers cationically polymerize to polymers having narrow molecular weight distributions. The vinyl ether may be copolymerized with styrene, alkyl-substituted styrenes, alkoxy-substituted styrenes and mixtures thereof.
    Type: Grant
    Filed: August 9, 1990
    Date of Patent: October 8, 1991
    Assignee: Shell Oil Company
    Inventor: Donn A. Dubois
  • Polymer and process for making the same
    Patent number: 5034466
    Abstract: Vinyl ether copolymers and a method of preparing the same. The vinyl ether is copolymerized with styrene, alkyl-substituted styrenes, alkoxy-substituted styrenes and mixtures thereof. In the process, a cadmium halide is used with hydrogen iodide or a suitable iodine containing electrophile, as the coinitiator.
    Type: Grant
    Filed: April 30, 1990
    Date of Patent: July 23, 1991
    Assignee: Shell Oil Company
    Inventor: Donn DuBois
  • Block copolymers
    Patent number: 5002676
    Abstract: Novel, selectively hyrogenated block compolymers, which compolymers comprise at least one block of polymerized alkyl methacrylate and one block of polymerized conjugated alkadiene, provide improved dispersant properties and viscosity index improvement to hydrocarbon lubricating oils.
    Type: Grant
    Filed: December 6, 1989
    Date of Patent: March 26, 1991
    Assignee: Shell Oil Company
    Inventors: Carl L. Willis, Donn A. DuBois
  • Preparation of alkyl methacrylate monomers for anionic polymerization
    Patent number: 4889900
    Abstract: A process is disclosed for treatment of alkyl methacrylate monomers for subsequent polymerization by an anionic initiator to produce a polymer with a molecular weight distribution between about 1.20 and about 1.01. The process involves treatment of the monomer with an aluminum hydrocarbyl or boron hydrocarbyl in quantities which permit polymerization in the presence of the by-products of the reaction between the impurities and the aluminum hydrocarbyl or boron hydrocarbyl.
    Type: Grant
    Filed: June 12, 1989
    Date of Patent: December 26, 1989
    Assignee: Shell Oil Company
    Inventor: Donn A. DuBois